E-print Network

Sample records for zinc oxide nanoparticles

  1. Interfacial mixing during annealing of zinc oxide nanoparticle junctions Ming Hu,1,a

    Physics Websites

    Daraio, Chiara

    Interfacial mixing during annealing of zinc oxide nanoparticle junctions Ming Hu,1,a Konstantinos P crystalline zinc oxide ZnO nanoparticles during pulsed thermal annealing in liquid tetradecane is studied on the controlled annealing of zinc oxide ZnO NP pairs to form nanometer-size junctions. ZnO was chosen be- cause

  2. Red Fluorescent Zinc Oxide Nanoparticle: A Novel Platform for Cancer Targeting

    Materials Science Websites

    Wang, Xudong

    Red Fluorescent Zinc Oxide Nanoparticle: A Novel Platform for Cancer Targeting Hao Hong, Fei Wang-2275, United States ABSTRACT: Multifunctional zinc oxide (ZnO) nanoparticles (NPs) with well cancer theranostics. KEYWORDS: zinc oxide, positron emission tomography, imaging, drug delivery, CD105

  3. Molecular Orbital Studies of Zinc Oxide Chemical Vapor Deposition: Gas-Phase Hydrolysis of Diethyl Zinc,

    Chemistry Websites

    Schlegel, H. Bernhard

    , nanoparticles, and thin films.7-10 Zinc oxide thin films can be deposited by atmospheric pressure chemical vaporMolecular Orbital Studies of Zinc Oxide Chemical Vapor Deposition: Gas-Phase Hydrolysis of Diethyl, Michigan, 48202 Received July 9, 2002. Revised Manuscript Received October 7, 2002 The chemical vapor

  4. Comparative study of zinc oxide and aluminum doped zinc oxide transparent thin films grown by direct current magnetron sputtering

    Materials Science Websites

    Comparative study of zinc oxide and aluminum doped zinc oxide transparent thin films grown January 2007 Abstract Pure and aluminum (Al) doped zinc oxide (ZnO and ZAO) thin films have been grown.V. All rights reserved. Keywords: Zinc oxide; dc magnetron sputtering; Surface morphology; Sensors 1

  5. RF sputtered piezoelectric zinc oxide thin film for transducer applications

    Biology and Medicine Websites

    Tang, William C

    RF sputtered piezoelectric zinc oxide thin film for transducer applications Yu-Hsiang Hsu Æ John depen- dency of the c-axis zinc oxide growth in radio-frequency sputtering system. Different deposition. 1 Introduction Zinc Oxide (ZnO) is a material that possesses versatile mechanical, electrical

  6. Piezoelectric Characterization of Individual Zinc Oxide Nanobelt Probed

    Materials Science Websites

    Wang, Zhong L.

    Piezoelectric Characterization of Individual Zinc Oxide Nanobelt Probed by Piezoresponse Force piezoelectric coefficient (d33) of an individual (0001) surface dominated zinc oxide nanobelt lying of ZnO nanobelts as nanosensors and nanoactuators. Zinc oxide is a semiconducting piezoelectric material

  7. Splendid One-Dimensional Nanostructures of Zinc Oxide: A New

    Materials Science Websites

    Wang, Zhong L.

    Splendid One-Dimensional Nanostructures of Zinc Oxide: A New Nanomaterial Family for Nanotechnology (0001) facets, owing to the positive and negative ionic charges on the zinc- and oxygen-terminated (0001 Zinc oxide is a unique material that exhibits exceptional semiconductin

  8. INFRARED SPECTROSCOPY OF ZINC OXIDE AND MAGNESIUM NANOSTRUCTURES

    Physics Websites

    Collins, Gary S.

    INFRARED SPECTROSCOPY OF ZINC OXIDE AND MAGNESIUM NANOSTRUCTURES By WIN MAW HLAING OO OF ZINC OXIDE AND MAGNESIUM NANOSTRUCTURES Abstract by Win Maw Hlaing Oo, Ph.D. Washington State investigated. ZnO nanopar- ticles were prepared by a reaction of zinc acetate and sodium hydrogen carbonate

  9. Novel Zinc Oxide Nanostructures Discovery by Electron Zhong Lin Wang

    Materials Science Websites

    Wang, Zhong L.

    Novel Zinc Oxide Nanostructures Discovery by Electron Microscopy Zhong Lin Wang School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245, USA Abstract. Zinc oxide fabricated based on individual nanobelts. Thermal transport along a nanobelt has been measured [7]. Zinc

  10. Atomistic Simulation Study of Spinel Oxides: Zinc Aluminate and Zinc Gallate

    Physics Websites

    Pandey, Ravi

    Atomistic Simulation Study of Spinel Oxides: Zinc Aluminate and Zinc Gallate Ravindra Pandey´tica, Universidad de Oviedo, 33006-Oviedo, Spain Stoichiometric zinc aluminate (ZnAl2O4) and zinc gallate (ZnGa2O4 of Al2O3/Ga2O3 via the formation of zinc vacancies is predicted relative to that of ZnO in ZnAl2O4/ZnGa2

  11. RF Characteristics of Room-Temperature-Deposited, Small Gate Dimension Indium Zinc Oxide TFTs

    Materials Science Websites

    Pearton, Stephen J.

    RF Characteristics of Room-Temperature-Deposited, Small Gate Dimension Indium Zinc Oxide TFTs Yu, North Carolina 27709, USA Depletion-mode indium zinc oxide channel thin film transistors TFTs with gate semiconductors such as zinc oxide, zinc tin oxide, indium gallium oxide, and indium gallium zinc tin oxide have

  12. RESEARCH PAPER Surfactant-modified nickel zinc iron oxide/polymer

    Materials Science Websites

    Rubloff, Gary W.

    RESEARCH PAPER Surfactant-modified nickel zinc iron oxide/polymer nanocomposites for radio ((lr/er)1/2 ) of the NiZnFe2O4 nanocomposites could potentially lead to a reduced RF device's physical Polymer composite Á Magneto-dielectric Á Magnetic nanoparticle Á Nanocomposites Introduction Radio

  13. Interfacial Bonding Stabilizes Rhodium and Rhodium Oxide Nanoparticles on Layered Nb Oxide and Ta Oxide Supports

    Materials Science Websites

    Interfacial Bonding Stabilizes Rhodium and Rhodium Oxide Nanoparticles on Layered Nb Oxide and Ta temperatures. Rhodium oxide and rhodium metal nanoparticles on niobate and tantalate supports are anomalously

  14. Bicrystalline zinc oxide nanowires Ying Dai a,1

    Materials Science Websites

    Wang, Zhong L.

    Bicrystalline zinc oxide nanowires Ying Dai a,1 , Yue Zhang a,b,*, Yuan Qiang Bai a , Zhong Lin discussed here were syn- thesized by thermal evaporation of 99.9% pure zinc powders under controlled conditions without the presence of catalyst. The zinc powders were placed in an alumina tube

  15. Author's personal copy Flame synthesis of zinc oxide nanowires

    Engineering Websites

    Tse, Stephen D.

    Author's personal copy Flame synthesis of zinc oxide nanowires Fusheng Xu a , Xiaofei LiuO nanowires are grown directly on zinc-plated-steel substrates at high rates (microns/minute) using a flame have been explored using different starting materials, e.g. zinc metal powder [5­13], ZnO powder [14

  16. Atomic layer deposited zinc tin oxide channel for amorphous oxide thin film transistors

    Materials Science Websites

    Atomic layer deposited zinc tin oxide channel for amorphous oxide thin film transistors Jaeyeong online 14 September 2012) Bottom-gate thin film transistors with amorphous zinc tin oxide channels were. Channels with higher zinc to tin ratio ($3­4) also performed better than ones with lower ratios ($1­3). VC

  17. Optical and Luminescence Properties of Zinc Oxide

    Nuclear Experiment (arXiv)

    P. A. Rodnyi; I. V. Khodyuk

    2012-03-20

    We generalize and systematize basic experimental data on optical and luminescence properties of ZnO single crystals, thin films, powders, ceramics, and nanocrystals. We consider and study mechanisms by which two main emission bands occur, a short-wavelength band near the fundamental absorption edge and a broad long-wavelength band, the maximum of which usually lies in the green spectral range. We determine a relationship between the two luminescence bands and study in detail the possibility of controlling the characteristics of ZnO by varying the maximum position of the short-wavelength band. We show that the optical and luminescence characteristics of ZnO largely depend on the choice of the corresponding impurity and the parameters of the synthesis and subsequent treatment of the sample. Prospects for using zinc oxide as a scintillator material are discussed. Additionally, we consider experimental results that are of principal interest for practice.

  18. Optical and Luminescence Properties of Zinc Oxide

    CERN Preprints

    Rodnyi, P A; 10.1134/S0030400X11120216

    2012-01-01

    We generalize and systematize basic experimental data on optical and luminescence properties of ZnO single crystals, thin films, powders, ceramics, and nanocrystals. We consider and study mechanisms by which two main emission bands occur, a short-wavelength band near the fundamental absorption edge and a broad long-wavelength band, the maximum of which usually lies in the green spectral range. We determine a relationship between the two luminescence bands and study in detail the possibility of controlling the characteristics of ZnO by varying the maximum position of the short-wavelength band. We show that the optical and luminescence characteristics of ZnO largely depend on the choice of the corresponding impurity and the parameters of the synthesis and subsequent treatment of the sample. Prospects for using zinc oxide as a scintillator material are discussed. Additionally, we consider experimental results that are of principal interest for practice.

  19. Optimization and Characterization of RF Sputtered Piezoelectric Zinc Oxide Thin Film for

    Engineering Websites

    Tang, William C

    Optimization and Characterization of RF Sputtered Piezoelectric Zinc Oxide Thin Film for Transducer dependency of the c-axis zinc oxide growth in radio-frequency sputtering system. Different deposition to single-step approach. Keywords- Zinc oxide;Piezoelectric transducer; RF-sputtering I. INTRODUCTION Zinc

  20. Nanoarchitectures of semiconducting and piezoelectric zinc oxide Pu Xian Gao and Zhong L. Wanga

    Materials Science Websites

    Wang, Zhong L.

    Nanoarchitectures of semiconducting and piezoelectric zinc oxide Pu Xian Gao and Zhong L. Wanga and piezoelectric zinc oxide has two important structure characteristics: the multiple and switchable growth conductive by doping. As a wurtzite-structured oxide, zinc oxide is of three types and a total of 13 fastest

  1. Thioredoxin 2, an Oxidative Stress-induced Protein, Contains a High Affinity Zinc Binding Site*

    Biotechnology Websites

    Bardwell, James

    Thioredoxin 2, an Oxidative Stress-induced Protein, Contains a High Affinity Zinc Binding Site contains zinc in a 1:1 stoichiometry, making it the first identified zinc- binding thioredoxin. The zinc atom is coordinated by the four cysteines of the two N-terminal CXXC motifs. The zinc center of Trx2

  2. Room temperature fast synthesis of zinc oxide nanowires by inductive heating

    Engineering Websites

    Lin, Liwei

    Room temperature fast synthesis of zinc oxide nanowires by inductive heating Lei Luo,a Brian D-generation devices.1,2 Among them, zinc oxide ZnO nanowires have been under intense study for applications

  3. Control of zinc oxide nanowire array properties with electron beam lithography templating for PV applications

    Materials Science Websites

    Berggren, Karl K.

    1 Control of zinc oxide nanowire array properties with electron beam lithography templating for PV-mail: berggren@mit.edu Abstract Hydrothermally synthesized zinc oxide nanowire arrays have been used,2]. Bulk heterojunction PV devices utilizing zinc oxide nanowire arrays have shown high performance when

  4. J Am Cerom Soc 73 [lo] 3026-32 (19901 Electrical Properties of Individual Zinc Oxide

    Materials Science Websites

    Rohrer, Gregory S.

    J Am Cerom Soc 73 [lo] 3026-32 (19901 Electrical Properties of Individual Zinc Oxide Grain properties of single interfaces and grain boundaries. [Keywords: grain boundaries, zinc oxide, varistors semiconductor, zinc oxide (ZnO), which is used commercially as a varistor material. This is an excellent

  5. Physica B 340342 (2003) 221224 Infrared spectroscopy of hydrogen in annealed zinc oxide

    Physics Websites

    McCluskey, Matthew

    2003-01-01

    Physica B 340­342 (2003) 221­224 Infrared spectroscopy of hydrogen in annealed zinc oxide S, USA Abstract Zinc oxide (ZnO) has shown great promise as a wide band gap semiconductor with optical reserved. Keywords: Zinc oxide; Hydrogen; FTIR; Polarization In previous studies, it has been shown

  6. Zinc Adsorption Effects on Arsenite Oxidation Kinetics at the

    Environmental Management and Restoration Websites

    Sparks, Donald L.

    Zinc Adsorption Effects on Arsenite Oxidation Kinetics at the Birnessite-Water Interface L A U R and Soil Sciences, University of Delaware, Newark, Delaware 19717-1303, and U.S. Geological Survey, Water at the birnessite-water interface were investigated using batch adsorption experiments (0.1 g L-1; pH 4.5 and 6.0; I

  7. Electrochemical Quartz Crystal Microbalance Studies of Electron Addition at Nanocrystalline Tin Oxide/Water and Zinc Oxide/Water Interfaces: Evidence for

    Renewable Energy Websites

    Oxide/Water and Zinc Oxide/Water Interfaces: Evidence for Band-Edge-Determining Proton Uptake Buford I at nanocrystalline zinc oxide/ water and tin oxide/water interfaces is similarly accompanied by uptake of charge

  8. Molecular Orbital Studies of Zinc Oxide Chemical Vapor Deposition: Gas-Phase Radical Reactions

    Chemistry Websites

    Schlegel, H. Bernhard

    be deposited by atmospheric pressure chemical vapor deposition (CVD) of diethyl zinc and an oxygen sourceMolecular Orbital Studies of Zinc Oxide Chemical Vapor Deposition: Gas-Phase Radical Reactions-phase reactions involved in the radical mechanism for zinc oxide chemical vapor deposition have been examined

  9. The Electrical and Band-Gap Properties of Amorphous Zinc-Indium-Tin Oxide Thin Films

    Engineering Websites

    Shahriar, Selim

    MRSEC The Electrical and Band-Gap Properties of Amorphous Zinc-Indium-Tin Oxide Thin Films D Science & Engineering Center For zinc-indium-tin oxide (ZITO) films, grown by pulsed-laser deposition was replaced by substitution with zinc and tin in equal molar proportions (co-substitution). All ZITO films

  10. COOPERATIVE CALCIUM AND ZINC SIGNALING UNDERLIES OXIDANT-INDUCED NEURONAL INJURY

    Biology and Medicine Websites

    Sibille, Etienne

    COOPERATIVE CALCIUM AND ZINC SIGNALING UNDERLIES OXIDANT- INDUCED NEURONAL INJURY by Meghan Copyright © by Meghan Campbell McCord 2013 #12;iv Intracellular zinc release triggered by oxidative injury+ occurs via zinc- dependent phosphorylation of Kv2.1 by Src kinase and p38 MAPK, leading to the insertion

  11. Analytic bond-order potential for atomistic simulations of zinc oxide

    Physics Websites

    Nordlund, Kai

    Analytic bond-order potential for atomistic simulations of zinc oxide Paul Erhart1 , Niklas Juslin2 for zinc oxide and its elemental constituents is derived based on an analytical bond-order formalism. The model potential provides a good description of the bulk properties of various solid structures of zinc

  12. Surface Plasmon Resonance (SPR) Electron and Energy Transfer in Noble Metal-Zinc Oxide Composite Nanocrystals

    Engineering Websites

    Kim, Tae-Geun

    Surface Plasmon Resonance (SPR) Electron and Energy Transfer in Noble Metal-Zinc Oxide Composite a dumbbell-like structure were successfully synthesized through the nucleation and decomposition of zinc

  13. Iron oxide nanoparticles as a contrast agent for thermoacoustic tomography 

    Texas A&M University - TxSpace

    Keho, Aaron Lopez

    2009-06-02

    radiation. The addition of an exogenous contrast agent improves image quality by more effectively converting microwave energy to heat. The use of iron oxide nanoparticles in MRI applications has been explored but super paramagnetic iron oxide nanoparticles...

  14. Zinc in a +III oxidation state

    CERN Preprints

    Samanta, Devleena

    2012-01-01

    The possibility of Group 12 elements, such as Zn, Cd, and Hg existing in an oxidation state of +III or higher and hence transforming them into transition metals has fascinated chemists for decades. It took nearly 20 years before experiment could confirm the theoretical prediction that Hg indeed can exist in an oxidation state of +IV. While this unusual property of Hg is attributed to the relativistic effects, Zn being much lighter than Hg has not been expected to have an oxidation state higher than +II. Using density functional theory we show that an oxidation state of +III for Zn can be realized by choosing specific ligands with large electron affinities. We demonstrate this by a systematic study of the interaction of Zn with F, BO2, and AuF6 ligands whose electron affinities are progressively higher, namely, 3.4 eV, 4.5 eV, and 8.6 eV, respectively. Discovery of higher oxidation states of elements can help in the formulation of new reactions and hence in the development of new chemistry.

  15. Stable Oxide Nanoparticle Clusters Obtained by Complexation

    Condensed Matter (arXiv)

    J. -F. Berret; A. Sehgal; M. Morvan; O. Sandre; A. Vacher; M. Airiau

    2006-08-08

    We report on the electrostatic complexation between polyelectrolyte-neutral copolymers and oppositely charged 6 nm-crystalline nanoparticles. For two different dispersions of oxide nanoparticles, the electrostatic complexation gives rise to the formation of stable nanoparticle clusters in the range 20 - 100 nm. It is found that inside the clusters, the particles are pasted together by the polyelectrolyte blocks adsorbed on their surface. Cryo-transmission electronic microscopy allows to visualize the clusters and to determine the probability distributions functions in size and in aggregation number. The comparison between light scattering and cryo-microscopy results suggests the existence of a polymer brush around the clusters.

  16. Ordered mesoporous silica nanoparticles with and without embedded iron oxide nanoparticles: structure evolution during synthesis

    Physics Websites

    Gruner, Sol M.

    the particle centers to the edges. Nitrogen sorption measurements for iron oxide-embedded mesoporousOrdered mesoporous silica nanoparticles with and without embedded iron oxide nanoparticles of hexagonally ordered mesoporous silica nanoparticles with and without embedded iron oxide particles. Oleic acid

  17. Electroluminescence from isolated defects in zinc oxide, towards electrically triggered single photon sources at room temperature

    CERN Preprints

    Choi, Sumin; Gentle, Angus; Ton-That, Cuong; Phillips, Matthew R; Aharonovich, Igor

    2015-01-01

    Single photon sources are required for a wide range of applications in quantum information science, quantum cryptography and quantum communications. However, so far majority of room temperature emitters are only excited optically, which limits their proper integration into scalable devices. In this work, we overcome this limitation and present room temperature electrically triggered light emission from localized defects in zinc oxide (ZnO) nanoparticles and thin films. The devices emit at the red spectral range and show excellent rectifying behavior. The emission is stable over an extensive period of time, providing an important prerequisite for practical devices. Our results open up possibilities to build new ZnO based quantum integrated devices that incorporate solid-state single photon sources for quantum information technologies.

  18. Near-Field Imaging of Nonlinear Optical Mixing in Single Zinc Oxide Nanowires

    Geosciences Websites

    Cohen, Ronald C.

    Near-Field Imaging of Nonlinear Optical Mixing in Single Zinc Oxide Nanowires Justin C. Johnson Manuscript Received January 16, 2002 ABSTRACT The nonlinear optical response of semiconductor nanowires has-harmonic generation (SHG, THG) are imaged on single zinc oxide (ZnO) nanowires using near-field scanning optical

  19. Impacts of Humidity and Temperature on the Performance of Transparent Conducting Zinc Oxide

    Energy Storage, Conversion and Utilization Websites

    Microscale Science & Technology Dept, 2 CINT Science Dept, 3 Materials, Devices & Energy Technology Dept, 4 conductive metals/materials associated with the module. Water ingress is particularly problematic in flexible 2 wt% Alumina doped zinc oxide on top of intrinsic zinc oxide MATERIALS & METHODS A

  20. An efficient non-Lambertian organic light-emitting diode using imprinted submicron-size zinc oxide pillar arrays

    Materials Science Websites

    Demir, Hilmi Volkan

    An efficient non-Lambertian organic light-emitting diode using imprinted submicron-size zinc oxide://apl.aip.org/about/rights_and_permissions #12;An efficient non-Lambertian organic light-emitting diode using imprinted submicron-size zinc oxide of zinc oxide periodic nanopillar arrays by pattern replication in non-wetting templates technique

  1. Co-sputtered Aluminum Doped Zinc Oxide Thin Film as Transparent Anode for Organic Light-emitting Diodes

    Materials Science Websites

    Co-sputtered Aluminum Doped Zinc Oxide Thin Film as Transparent Anode for Organic Light and Technology, Clear Water Bay, Kowloon, Hong Kong, China ABSTRACT Aluminum doped zinc oxide (AZO zinc oxide, organic light- emitting diodes, co-sputtering 1. INTRODUCTION Much research work has been

  2. Infrared Spectroscopy of Impurities in ZnO Nanoparticles W. M. Hlaing Oo and M. D. McCluskey

    Physics Websites

    McCluskey, Matthew

    nanoparticles have a range of potential applications in electronic, optoelectronic and spintronic devices. Zinc, reflection and electrical properties of the nanoparticles. INTRODUCTION Zinc oxide (ZnO) has received, and transparent conducting thin films [1-2]. A variety of wet-chemical methods, using zinc salts such as zinc

  3. Compact Zwitterion-Coated Iron Oxide Nanoparticles for Biological Applications

    MIT - DSpace

    Wei, He

    The potential of superparamagnetic iron oxide nanoparticles (SPIONs) in various biomedical applications, including magnetic resonance imaging (MRI), sensing, and drug delivery, requires that their surface be derivatized ...

  4. Preparation of magnetic and bioactive calcium zinc iron silicon oxide composite for hyperthermia treatment of bone cancer

    Engineering Websites

    Qin, Qinghua

    Preparation of magnetic and bioactive calcium zinc iron silicon oxide composite for hyperthermia Science+Business Media, LLC 2010 Abstract In this paper, a calcium zinc iron silicon oxide composite (CZIS. The use of ther- mally sensitive material such as zinc ferrite is expected to be helpful for identifying

  5. J. Phys.: Condens. Matter 11 (1999) 36353644. Printed in the UK PII: S0953-8984(99)98511-9 Electronic structure of spinel oxides: zinc aluminate and

    Physics Websites

    Pandey, Ravi

    1999-01-01

    -8984(99)98511-9 Electronic structure of spinel oxides: zinc aluminate and zinc gallate Suresh K Sampath, D G Kanhere 20 October 1998 Abstract. The electronic structure of zinc aluminate (ZnAl2O4) and that of zinc with the atomic sphere approximation. The calculated results predict these zinc-based spinel oxides to be direct

  6. In-situ hydrothermal synthesis of zinc oxide nanostructures using microheaters

    University of Cambridge - Dspace

    Lin, Wei-Chih; Lin, Yu-Ching; Esashi, Masayoshi; Seshia, Ashwin A.

    2015-08-13

    A technique for in-situ hydrothermal synthesis of transversely suspended zinc oxide nanowires (ZnO NWs) using microfabricated heaters is presented. A number of issues relating to seed layer preparation, directed alignment, local heating control...

  7. Biochemistry of mobile zinc and nitric oxide revealed by fluorescent sensors

    MIT - DSpace

    Pluth, Michael D.

    Biological mobile zinc and nitric oxide (NO) are two prominent examples of inorganic compounds involved in numerous signaling pathways in living systems. In the past decade, a synergy of regulation, signaling, and translocation ...

  8. Phase equilibria and properties of transparent conductors in the indium-tin-zinc oxide system

    Chemistry Websites

    Poeppelmeier, Kenneth R.

    Phase equilibria and properties of transparent conductors in the indium-tin-zinc oxide system of resultant phase-pure TCO's were compared to each other and to bulk samples of Sn-doped In2O3 (ITO). Redn

  9. Control of zinc oxide nanowire array properties with electron beam lithography templating for PV applications

    MIT - DSpace

    Kiani, Amirreza

    Hydrothermally synthesized zinc oxide nanowire arrays have been used as nanostructured acceptors in emerging photovoltaic (PV) devices. The nanoscale dimensions of such arrays allow for enhanced charge extraction from PV ...

  10. Ultrathin amorphous zinc-tin-oxide buffer layer for enhancing heterojunction interface quality in

    Chemistry Websites

    -blocking layer to enhance the performance of an Earth-abundant metal-oxide solar-cell material. A 5 nm thickUltrathin amorphous zinc-tin-oxide buffer layer for enhancing heterojunction interface quality amorphous ternary metal-oxide buffer layer reduces interface recombination, resulting in sizable open

  11. Recrystallization of picosecond laser-melted ZnO nanoparticles in a liquid: A molecular dynamics study

    Physics Websites

    Daraio, Chiara

    Recrystallization of picosecond laser-melted ZnO nanoparticles in a liquid: A molecular dynamics of zinc oxide ZnO nanoparticles in liquid tetradecane upon picosecond laser heating. The coalescence temperatures by using laser heating of nanoparticles,2 even reaching the melting point of zinc oxide ZnO

  12. Stability and Aggregation of Metal Oxide Nanoparticles in Natural

    Biology and Medicine Websites

    Cardinale, Bradley J.

    dispersed three different metal oxide nanoparticles (TiO2, ZnO and CeO2) in samples taken from eightO) nanoparticles, such as TiO2, ZnO and CeO2, are increasingly incorporated into a wide range of products (e

  13. Polymer-coated iron oxide nanoparticles for medical imaging

    MIT - DSpace

    Chen, Suelin, Ph.D. Massachusetts Institute of Technology

    2010-01-01

    One of the most versatile and safe materials used in medicine are polymer-coated iron oxide nanoparticles. This dissertation describes several formulations for in vivo imaging applications. The paramagnetic polymer-coated ...

  14. Surface modifications of iron oxide nanoparticles for biological applications

    MIT - DSpace

    Insin, Numpon

    2011-01-01

    Iron oxides magnetic nanoparticles (MPs) of high crystallinity, high magnetization, and size-monodispersity were synthesized with oleic acid as their native ligands. These hydrophobic and non-functionalized MPs have magnetic ...

  15. Superparamagnetic Iron Oxide Nanoparticles with Variable Size and an Iron Oxidation State as Prospective Imaging Agents

    Engineering Websites

    Spinu, Leonard

    Superparamagnetic Iron Oxide Nanoparticles with Variable Size and an Iron Oxidation State temperature and time and by using a sequential growth technique. To obtain -iron(III) oxide particles in the same range of sizes, magnetite particles were oxidized with dry oxygen in diethylene glycol at room

  16. X-ray absorption spectroscopy elucidates the impact of structural disorder on electron mobility in amorphous zinc-tin-oxide thin films

    Chemistry Websites

    in amorphous zinc-tin-oxide thin films Sin Cheng Siah,1,a),b) Sang Woon Lee,2,c) Yun Seog Lee,1 Jaeyeong Heo,3 June 2014) We investigate the correlation between the atomic structures of amorphous zinc-tin-oxide (a-emitting diodes. Zinc oxide and related oxide classes are investigated due to their high electron mobilities

  17. Zinc-catalyzed copolymerization of carbon dioxide and propylene oxide 

    Texas A&M University - TxSpace

    Katsurao, Takumi

    1994-01-01

    carbon dioxide was a suitable substitute for organic solvents in the copolymerization reactions. Great diffusivity of supercritical carbon dioxide into polymer segments was thought to promote carbon dioxide supply to the active sites of the zinc species...

  18. Abstract--In this work, we reported fabrication of new miniature sensors utilizing iridium oxide (IrO2) nanorods to

    Engineering Websites

    Chiao, Jung-Chih

    Abstract--In this work, we reported fabrication of new miniature sensors utilizing iridium oxide template, chemical bath deposition, dopamine, iridium oxide, nanorods, nanotemplate. I. INTRODUCTION nanoparticles, zinc oxide nanorods and iridium oxide nanostructures [9-13]. Among these materials

  19. Solar Energy Materials & Solar Cells 91 (2007) 924930 Plasma-enhanced chemical vapor deposition of zinc oxide at

    Materials Science Websites

    Hicks, Robert F.

    2007-01-01

    Solar Energy Materials & Solar Cells 91 (2007) 924­930 Plasma-enhanced chemical vapor deposition of zinc oxide at atmospheric pressure and low temperature M.D. Barankin, E. Gonzalez II, A.M. Ladwig, R vapor deposition of aluminum-doped zinc oxide has been demonstrated for the first time at 800 Torr

  20. Atmospheric pressure chemical vapor deposition of transparent conducting films of fluorine doped zinc oxide and their application

    Chemistry Websites

    zinc oxide and their application to amorphous silicon solar cells Haifan Liang Æ Roy G. Gordon Received of 650 nm. Amorphous silicon solar cells were deposited using the textured ZnO:F films as the front structure. As a thin film, zinc oxide has many practical applications, such as in solar cells, liquid

  1. Formation of ZnO nanoparticles by laser ablation in neat water Kuk Ki Kim a

    Chemistry Websites

    Kim, Sang Kyu

    online 12 June 2011 a b s t r a c t Zinc oxide (ZnO) nanoparticles were prepared in neat deionized water Elsevier B.V. All rights reserved. 1. Introduction Zinc oxide (ZnO) has attractive properties using physical and chemical methods [1­3]. Recently, laser ablation of a zinc metal target in liquid

  2. 125 Proceedings of the NATO Advanced Workshop on Zinc Oxide, edited by N. Nickel and E. Terukov, NATO Science Series II, Vol. 194, p. 125-32 (2005).

    Physics Websites

    McCluskey, Matthew

    2005-01-01

    125 Proceedings of the NATO Advanced Workshop on Zinc Oxide, edited by N. Nickel and E. Terukov, NATO Science Series II, Vol. 194, p. 125-32 (2005). HYDROGEN DONORS IN ZINC OXIDE M.D. McCluskey and S.J. Jokela Department of Physics, Washington State University, Pullman, WA 99164-2814 Abstract: Zinc oxide

  3. Authigenic iron oxide proxies for marine zinc over geological time and implications for eukaryotic metallome

    Geosciences Websites

    Konhauser, Kurt

    on potential couplings between the trajectory of biological and marine geochemical coevolution. Received 14Authigenic iron oxide proxies for marine zinc over geological time and implications for eukaryotic for Marine Studies, Technopo^le Brest-Iroise, Plouzane´, France 3 Marine Chemistry and Geochemistry

  4. Synthesis and characterization of pn homojunction-containing zinc oxide nanowires

    Materials Science Websites

    Pennycook, Steve

    Synthesis and characterization of p­n homojunction-containing zinc oxide nanowires Guohua Li­n homojunction-containing nanowires using a low temperature method, and on a variety of substrates. X of electrical transport through a single nanowire based device and cathodoluminescence via scanning transmission

  5. Zinc Oxide Nanowires Low-Temperature Wafer-Scale Production of

    Geosciences Websites

    Cohen, Ronald C.

    Zinc Oxide Nanowires Low-Temperature Wafer-Scale Production of ZnO Nanowire Arrays** Lori E. Greene-phase-grown ZnO nanowires remains constrained by the expensive and/or insulating (for example, Al2O3) substrates-temperature, large-scale, and versatile synthetic process is needed before ZnO nanowire arrays find realistic applica

  6. Journal of Crystal Growth 274 (2005) 126131 Well-aligned zinc oxide nanorods and nanowires prepared

    Materials Science Websites

    Gao, Hongjun

    2005-01-01

    Journal of Crystal Growth 274 (2005) 126­131 Well-aligned zinc oxide nanorods and nanowires temperature (550 1C), well-aligned ZnO nanorods and nanowires were prepared on porous silicon substrates using confirm that both the nanorods and the nanowires are perfect single crystals with the wurtzite structure

  7. Optical properties of epitaxially grown zinc oxide films on sapphire by pulsed laser deposition

    Engineering Websites

    Kwok, Hoi S.

    Optical properties of epitaxially grown zinc oxide films on sapphire by pulsed laser deposition X 18 August 1998; accepted for publication 23 March 1999 ZnO thin films were epitaxially grown on c-sapphire and unavailable in large wafers for the time being, ZnO thin film, especially on sapphire, is a relatively good

  8. Reduction of Sintering during Annealing of FePt Nanoparticles Coated with Iron Oxide

    Materials Science Websites

    Laughlin, David E.

    Reduction of Sintering during Annealing of FePt Nanoparticles Coated with Iron Oxide Chao Liu synthesis step. The role of the iron oxide shell on sintering of FePt nanoparticles is investigated °C for 30 min at which 2.6-nm FePt nanoparticles without oxide shell coating start to sinter. Low

  9. Efficient Formation of Iron Nanoparticle Catalysts on Silicon Oxide by

    Materials Science Websites

    Javey, Ali

    iron oxide nanoparticles can be derived and used to catalyze the growth of single-walled carbon. Patterned growth of nanotubes with this catalyst retains high degrees of surface cleanliness and leads to arrays of nanotube electronic devices including field effect transistors. The population of hydroxyl

  10. Mechanical properties of amorphous indium–gallium–zinc oxide thin films on compliant substrates for flexible optoelectronic devices

    University of Cambridge - Dspace

    Mohammed, D. W.; Waddingham, R.; Flewitt, A. J.; Sierros, K. A.; Bowend, J.; Kukureka, S. N.

    2015-09-26

    Amorphous indium–gallium–zinc-oxide (a-IGZO) thin films were deposited using RF magnetron sputtering on polyethylene naphthalate (PEN) and polyethylene terephthalate (PET) flexible substrates and their mechanical flexibility investigated using...

  11. P-11: Electrical Properties and Stability of Dual-Gate Coplanar Homojunction Amorphous Indium-Gallium-Zinc-Oxide Thin-Film Transistor

    Engineering Websites

    Kanicki, Jerzy

    P-11: Electrical Properties and Stability of Dual-Gate Coplanar Homojunction Amorphous Indium-Gallium-Zinc of dual-gate (DG) coplanar homojunction amorphous indium-gallium-zinc-oxide thin-film transistors (a

  12. Synthesis and Characterization of Silica-Coated Iron Oxide Nanoparticles in Microemulsion: The Effect of Nonionic

    Biotechnology Websites

    Tan, Weihong

    , crystallinity, and the magnetic properties have been studied. The iron oxide nanoparticles are formed to study both uncoated and silica-coated iron oxide nanoparticles. All these particles show magnetic behavior close to that of superparamagnetic materials. By use of this method, magnetic nanoparticles

  13. Evaluation of the optical axis tilt of Zinc oxide films via noncollinear second harmonic generation

    CERN Preprints

    Bovino, Fabio Antonio; Belardini, Alessandro; Sibilia, Concita

    2009-01-01

    We investigated noncollinear second harmonic generation form Zinc oxide films, grown on glass substrates by dual ion beam sputtering technique. At a fixed incidence angle, the generated signal is investigated by scanning the polarization state of both fundamental beams. We show that the map of the generated signal as a function of polarization states of both pump beams, together with the analytical curves, allows to retrieve the orientation of the optical axis and, eventually, its angular tilt, with respect to the surface normal

  14. Compact zwitterion-coated iron oxide nanoparticles for in vitro and in vivo imaging

    MIT - DSpace

    Wei, He

    We have recently developed compact and water-soluble zwitterionic dopamine sulfonate (ZDS) ligand coated superparamagnetic iron oxide nanoparticles (SPIONs) for use in various biomedical applications. The defining ...

  15. Organically Capped Silicon Nanoparticles with Blue Photoluminescence Prepared by Hydrosilylation Followed by Oxidation

    Materials Science Websites

    Swihart, Mark T.

    Organically Capped Silicon Nanoparticles with Blue Photoluminescence Prepared by Hydrosilylation-emitting silicon nanoparticles that are dispersible in common organic solvents is presented. Oxidation of yellow-emitting silicon nanoparticles with an organic monolayer grafted to their surface, using either UV irradiation

  16. Observations of oxidation mechanisms and kinetics in faceted FeCo magnetic nanoparticles

    Materials Science Websites

    Laughlin, David E.

    Fe50Co50 97V2Nb1 nanoparticles were synthesized in an induction plasma torch and oxidizedCo nanoparticles are important materials in biomedi- cal, electromagnetic interference EMI absorption, and other as other materials, while using a lower concentration of the nanoparticles. A high saturation induction

  17. Second harmonic generation in laser ablated zinc oxide thin films J. Y. Wu, H. C. Ong, J. Y. Dai, and R. P. H. Chang

    Physics Websites

    Cao, Hui

    Second harmonic generation in laser ablated zinc oxide thin films H. Cao,a) J. Y. Wu, H. C. Ong, J-order nonlinear optical response from zinc oxide ZnO thin films deposited on sapphire substrates by pulsed laser ablation. By comparing the second harmonic signal generated in a series of ZnO films with different

  18. Journal of Magnetism and Magnetic Materials 266 (2003) 96101 Oxidation of FePt nanoparticles

    Materials Science Websites

    Laughlin, David E.

    2003-01-01

    [12­14], magnetic resonance imaging (MRI) contrast enhancement [15], ferrofluids [16] and magneticJournal of Magnetism and Magnetic Materials 266 (2003) 96­101 Oxidation of FePt nanoparticles Chao; FePt; Magnetic nanoparticles; Oxidation; Phase transformation 1. Introduction Nanometer

  19. Preparation of Polymer-Coated Functionalized Ferrimagnetic Iron Oxide Nanoparticles*

    MIT - DSpace

    Yu, Shi

    A simple chemical method to synthesize PMAA coated maghemite nanoparticles is described. Monomer methacrylic acid molecules were absorbed onto the synthesized ferrimagnetic nanoparticles followed by polymerization. The ...

  20. UV irradiation-induced zinc dissociation from commercial zinc oxide sunscreen and its action in human epidermal keratinocytes

    Biology and Medicine Websites

    Li, Yang V.

    the ultraviolet (UV) light spectrum and it is used to protect against the carcinogenic and photodamaging effects of solar radiation on the skin. This study investigated the dissociation of zinc (Zn2+ ) from ZnO in commercial sunscreens under ultraviolet type B light (UVB) irradiation and assessed the cytotoxicity of Zn2

  1. A novel strategy for surface modification of superparamagnetic iron oxide nanoparticles for lung cancer imaging

    Biology and Medicine Websites

    Gao, Jinming

    A novel strategy for surface modification of superparamagnetic iron oxide nanoparticles for lung-step procedure for the surface functionalization of SPIO nanoparticles with a lung cancer-targeting peptide and demonstrate high T2 relaxivity. The nanoprobes are specific in targeting avb6­expressing lung cancer cells

  2. Surfactant Organic Molecules Restore Magnetism in Metal-Oxide Nanoparticle Surfaces

    Materials Science Websites

    Pennycook, Steve

    Surfactant Organic Molecules Restore Magnetism in Metal-Oxide Nanoparticle Surfaces Juan Salafranca, Nashville, Tennessee 37235, United States *S Supporting Information ABSTRACT: The properties of magnetic nanoparticles tend to be depressed by the unavoidable presence of a magnetically inactive surface layer. However

  3. Synthesis and development of hydrophilic iron oxide nanoparticles for biomedical applications

    MIT - DSpace

    Wei, He, Ph.D. Massachusetts Institute of Technology

    2014-01-01

    Uniformly sized superparamagnetic iron oxide nanoparticles (SPIONs) with inorganic diameters of 3-35 nm were synthesized. New surface ligand coatings were designed and synthesized, and the resulting hydrophilic SPIONs in ...

  4. Lipidoid-Coated Iron Oxide Nanoparticles for Efficient DNA and siRNA delivery

    MIT - DSpace

    Jiang, Shan

    The safe, targeted and effective delivery of gene therapeutics remains a significant barrier to their broad clinical application. Here we develop a magnetic nucleic acid delivery system composed of iron oxide nanoparticles ...

  5. Screen-Based Analysis of Magnetic Nanoparticle Libraries Formed Using Peptidic Iron Oxide Ligands

    MIT - DSpace

    Barch, Mariya

    The identification of effective polypeptide ligands for magnetic iron oxide nanoparticles (IONPs) could considerably accelerate the high-throughput analysis of IONP-based reagents for imaging and cell labeling. We developed ...

  6. A thermalization energy analysis of the threshold voltage shift in amorphous indium gallium zinc oxide thin film transistors under simultaneous negative gate bias and illumination

    University of Cambridge - Dspace

    Flewitt, Andrew J.; Powell, M.J.

    2014-01-01

    It has been previously observed that thin film transistors (TFTs) utilizing an amorphous indium gallium zinc oxide (a-IGZO) semiconducting channel suffer from a threshold voltage shift when subjected to a negative gate bias and light illumination...

  7. X-ray absorption spectroscopy elucidates the impact of structural disorder on electron mobility in amorphous zinc-tin-oxide thin films

    MIT - DSpace

    Siah, Sin Cheng

    We investigate the correlation between the atomic structures of amorphous zinc-tin-oxide (a-ZTO) thin films grown by atomic layer deposition (ALD) and their electronic transport properties. We perform synchrotron-based ...

  8. Vacancy Coalescence during Oxidation of Iron Nanoparticles Andreu Cabot, Victor F. Puntes, Elena Shevchenko, Yadong Yin,,| Lluis Balcells,

    Physics Websites

    transformations from an elemental nanoparticle of iron to the corresponding oxides. Here we demonstrateVacancy Coalescence during Oxidation of Iron Nanoparticles Andreu Cabot, Victor F. Puntes, Elena at Berkeley, Berkeley, California 94720 Received April 12, 2007; E-mail: alivis@berkeley.edu Iron oxide

  9. Zinc ferrite nanoparticles as MRI contrast agentsw Carlos Ba rcena,a

    Biology and Medicine Websites

    Gao, Jinming

    -stoichiometric zinc ferrite nano- particles, ZnxFe1ÀxOÁFe2O3 (also abbreviated as Zn-SPIO) and their potential, which is much higher than the Mn value (2 mg/day).11 As a proof of concept, we chose 4­5 nm Zn-SPIO nano- particles as a model system. The use of similar sized nano- particles eliminates the experimental artifacts

  10. Mercury Removal from Aqueous Systems Using Commercial and Laboratory Prepared Metal Oxide Nanoparticles 

    Texas A&M University - TxSpace

    Desai, Ishan

    2010-10-12

    Five commercial metal oxide nanoparticles (CuO, SiO2, Fe2O3, TiO2 and Al2O3) have been individually screened for mercury removal in a batch reactor under bicarbonate buffered and non-buffered aqueous solutions (DI water). Copper oxide...

  11. Black oxide nanoparticles as durable solar absorbing material for high-temperature concentrating solar power system

    Engineering Websites

    California at San Diego, University of

    Black oxide nanoparticles as durable solar absorbing material for high-temperature concentrating solar power system Jaeyun Moon a,c,1 , Tae Kyoung Kim a,c,1 , Bryan VanSaders b,c,1 , Chulmin Choi a Available online 8 January 2015 Keywords: Concentrating solar power Solar absorber Cobalt oxide Light

  12. Improved fill factors in amorphous silicon solar cells on zinc oxide by insertion of a germanium layer to block impurity incorporation

    Chemistry Websites

    Improved fill factors in amorphous silicon solar cells on zinc oxide by insertion of a germanium of a thin, amorphous germanium layer at the ZnO­p-layer interface improves the cell performance and diode-layers deposited on ZnO are higher than that on SnO2.8 Germanium has been previously used as a barrier to oxide

  13. Novel application of the CORAL software to model cytotoxicity of metal oxide nanoparticles to bacteria Escherichia coli

    Computer Technologies and Information Sciences Websites

    Gini, Giuseppina

    to bacteria Escherichia coli Andrey A. Toropov a, , Alla P. Toropova a , Emilio Benfenati a , Giuseppina Gini Keywords: QSAR CORAL software Cytotoxicity to bacterium Escherichia coli Metal oxide nanoparticle a b s t r of cytotoxicity of metal oxide nanoparticles to bacteria Escherichia coli (minus logarithm of concentration for 50

  14. Hyperthermia HeLa cell treatment with silica coated manganese oxide nanoparticles

    CERN Preprints

    Villanueva, A; Alonso, JM; Rueda, T; Martínez, A; Crespo, P; Morales, MP; Fernandez, MA Gonzalez; Valdes, J; Rivero, G

    2009-01-01

    HeLa tumour cells incubated with ferromagnetic nanoparticles of manganese oxide perovskite La0.56(SrCa)0.22MnO3 were treated with a high frequency alternating magnetic field. The particles were previously coated with silica to improve their biocompatibility. The control assays made with HeLa tumour cells showed that cell survival and growth rate were not affected by the particle internalization in cells, or by the electromagnetic field on cells without nanoparticles. The application of an alternating electromagnetic field to cells incubated with this silica coated manganese oxide induced a significant cellular damage that finally lead to cell death by an apoptotic mechanism.

  15. Chemical Precipitation Synthesis of Ferric Chloride Doped Zinc Sulphide Nanoparticles and Their Characterization Studies

    CERN Preprints

    Theivasanthi, T; Alagar, M; 10.7598/cst2013.207

    2013-01-01

    Nanoparticles of Ferric Chloride doped ZnS has been synthesized by simple chemical precipitation method and characterized by XRD, SEM, UV-Vis analysis, Differential Thermal Analysis, Thermo Gravimetric Analysis and Differential Scanning Calorimetry. XRD patterns of the samples reveal particle size, specific surface area and the formation of cubic structure. The SEM images show that the cauliflower likes structure. Optical band gap values have been obtained from UV-Vis absorption spectra. It has also been found that energy band gap (Eg) increases with the increase in molar concentration of reactant solution. Thermal analysis measurement of the prepared sample shows that the thermal stability of pure ZnS is decreased due to increase in Ferric Chloride concentration. Undoped ZnS is more thermal stable when compared to FeCl3 doped ZnS.

  16. Nitric oxide reactions of bio-Inspired zinc and cobalt complexes

    MIT - DSpace

    Kozhukh, Julia, 1985-

    2012-01-01

    Chapter 1. Bioinorganic Chemistry of Nitric Oxide and of Some of Its Targets The redox-active nature of nitric oxide (NO) regulates the chemistry and roles of NO in biology. The interactions of NO with nitric oxide synthases, ...

  17. SmCo5/Fe nanocomposites synthesized from reductive annealing of oxide nanoparticles

    Materials Science Websites

    Liu, J. Ping

    SmCo5/Fe nanocomposites synthesized from reductive annealing of oxide nanoparticles Yanglong Hou nanocomposites SmCo5/Fex x=0­2.9 are synthesized by a simultaneous calcium reduction of Sm­Co­O and Fe3O4 SmCo-based exchange-spring nanocomposites for high performance permanent magnet applications. © 2007

  18. Size-dependant heating rates of iron oxide nanoparticles for magnetic fluid hyperthermia

    Materials Science Websites

    Krishnan, Kannan M.

    Size-dependant heating rates of iron oxide nanoparticles for magnetic fluid hyperthermia Marcela and transferred them to a water phase by coating with a biocompatible polymer. The magnetic behavior particles we have unambiguously demonstrated, for the first time, that at a given frequency, heating rates

  19. Low temperature growth of amorphous Si nanoparticles in oxide matrix for efficient visible photoluminescence

    Materials Science Websites

    Zexian, Cao

    in the whole visible light range has been measured in samples prepared with this low-temperature procedureLow temperature growth of amorphous Si nanoparticles in oxide matrix for efficient visible the discovery of visible photoluminescence (PL) at room temperature in porous silicon in 1990,1 many nano

  20. Ultrathin amorphous zinc-tin-oxide buffer layer for enhancing heterojunction interface quality in metal-oxide solar cells

    MIT - DSpace

    Heo, Jaeyeong

    We demonstrate a tunable electron-blocking layer to enhance the performance of an Earth-abundant metal-oxide solar-cell material. A 5 nm thick amorphous ternary metal-oxide buffer layer reduces interface recombination, ...

  1. In Situe Synthesis of Iron Oxide within Polyvinylamine nanoparticles

    University of Kansas - KU ScholarWorks

    Mohammadi, Zahra

    2008-07-17

    polymers have been reported to modify the surface of superparamagnetic nanoparticles to enhance their function in vivo. Poly(ethylene-co-vinylacetate), poly(vinylpyrrolidone) (PVP), poly(lactic-co- glycolic acid) (PLGA), poly(ethyleneglycol) (PEG), poly... Enhances the blood circulation time, stabilizes [36] the colloidal solution Polyvinylpyrrolidone (PVP) Enhances the blood circulation time, stabilizes [37] the colloidal solution Polyvinyl alcohol (PVA) Prevents coagulation...

  2. Synthesis of Monodisperse Biotinylated p(NIPAAm)-Coated Iron Oxide Magnetic Nanoparticles and their Bioconjugation to Streptavidin

    Materials Science Websites

    Krishnan, Kannan M.

    for in vivo applications. They are being studied for use as contrast agents for magnetic resonance imaging,4Synthesis of Monodisperse Biotinylated p(NIPAAm)-Coated Iron Oxide Magnetic Nanoparticles with a mixture of PNIPAAm and b-PNIPAAm at 60 °C. The b-PNIPAAm-coated magnetic nanoparticles were found to have

  3. Mechanisms of Zinc Oxide Nanocrystalline Thin Film Formation by Thermal Degradation of Metal-Loaded Hydrogels

    Physics Websites

    -Loaded Hydrogels Ilenia G. Tredici, Alessandro Resmini, Sonia Pin,, Paolo Ghigna, Tommaso Rovetta,§ Maddalena, Italy *S Supporting Information ABSTRACT: Thermal degradation of metal-loaded hydrogel filmsO nanoparticles in Zn-loaded hydrogels, annealed for 20 min at temperatures between 150 and 500 °C

  4. Nanowire and nanobelt arrays of zinc oxide from synthesis to properties and to novel devices{

    Materials Science Websites

    Wang, Zhong L.

    and patterning nanowires and nanoparticles. He has pub- lished more than 20 papers and holds 4 patents/provisional patents with Dr Zhong L. Wang in patterning nanostructures and designing nanodevices. Jinhui Song Jinhui volumes of books on nanotechnology, and holds 12 patents and provisional patents. He is in the world's top

  5. Chemical Capping Synthesis of Nickel Oxide Nanoparticles and their Characterizations Studies

    CERN Preprints

    rifaya, M Nowsath; Alagar, M; 10.5923/j.nn.20120205.01

    2012-01-01

    This work reports aspect related to chemical capping synthesis of nano-sized particles of nickel oxide. It is a simple, novel and cost effective method. The average particle size, specific surface area, crystallinity index are estimated from XRD analysis. The structural, functional groups and optical characters are analyzed with using of SEM, FTIR and UV- visible techniques. XRD studies confirm the presence of high degree of crystallinity nature of nickel oxide nanoparticles. Their particle size is found to be 12 nm and specific surface area (SSA) is 74m2 g-1. The optical band gap energy value 3.83ev has also been determined from UV-vis spectrum.

  6. Precipitation-Redispersion of Cerium Oxide Nanoparticles with Poly(Acrylic Acid) : Towards Stable Dispersions

    Condensed Matter (arXiv)

    A. Sehgal; Y. Lalatonne; J. -F. Berret; M. Morvan

    2005-07-21

    We exploit a precipitation-redispersion mechanism for complexation of short chain polyelectrolytes with cerium oxide nanoparticles to extend their stability ranges. As synthesized, cerium oxide sols at pH 1.4 consist of monodisperse cationic nanocrystalline particles having a hydrodynamic diameter of 10 nm and a molecular weight 400000 gmol-1. We show that short chain uncharged poly(acrylic acid) at low pH when added to a cerium oxide sols leads to macroscopic precipitation. As the pH is increased, the solution spontaneously redisperses into a clear solution of single particles with an anionic poly(acrylic acid) corona. The structure and dynamics of cerium oxide nanosols and their hybrid polymer-inorganic complexes in solution are investigated by static and dynamic light scattering, X-ray scattering, and by chemical analysis. Quantitative analysis of the redispersed sol gives rise to an estimate of 40 - 50 polymer chains per particle for stable suspension. This amount represents 20 % of the mass of the polymer-nanoparticle complexes. This complexation adds utility to the otherwise unstable cerium oxide dispersions by extending the range of stability of the sols in terms of pH, ionic strength and concentration.

  7. How and why electrostatic charge of combustible nanoparticles can radically change the mechanism and rate of their oxidation in humid atmosphere

    CERN Preprints

    Meshcheryakov, Oleg

    2010-01-01

    Electrostatically charged aerosol nanoparticles strongly attract surrounding polar gas molecules due to a charge-dipole interaction. In humid air, the substantial electrostatic attraction and acceleration of surrounding water vapour molecules towards charged combustible nanoparticles cause intense electrostatic hydration and preferential oxidation of these nanoparticles by accelerated water vapor molecules rather than non-polar oxygen molecules. In particular, electrostatic acceleration, acquired by surrounding water vapour molecules at a distance of their mean free path from the minimally charged iron metal nanoparticle can increase an oxidative activity of these polar molecules with respect to the nanoparticle by a factor of one million. Intense electrostatic hydration of charged metal nanoparticles converts the nanoparticle's oxide based shells into the hydroxide based electrolyte shells, transforming these nanoparticles into metal/air core-shell nanobatteries, periodically short-circuited by intra-particl...

  8. Zinc Thiolate Reactivity toward Nitrogen Oxides: Insights into the Interaction of Zn[superscript 2+] with S-Nitrosothiols and Implications for Nitric Oxide Synthase

    MIT - DSpace

    Kozhukh, Julia

    Zinc thiolate complexes containing N[subscript 2]S tridentate ligands were prepared to investigate their reactivity toward reactive nitrogen species, chemistry proposed to occur at the zinc tetracysteine thiolate site of ...

  9. Impact of surface roughness of Au core in Au/Pd coreeshell nanoparticles toward formic acid oxidation e Experiment and

    Energy Storage, Conversion and Utilization Websites

    Liu, Fuqiang

    Impact of surface roughness of Au core in Au/Pd coreeshell nanoparticles toward formic acid Keywords: Formic acid oxidation Coreeshell Au/Pd Pd black Simulation a b s t r a c t The Au/Pd coreeshell) have the smoothest Pd surface and demonstrate higher formic acid oxidation (FAO) activity (0.714 mA cm

  10. TEM characterization of diblock copolymer templated iron oxide nanoparticles: Bulk solution and thin film surface doping approach

    Materials Science Websites

    Rubloff, Gary W.

    )-b-poly(norbornene dicarboxylic acid), was investigated before and after metal oxide doping by transmission electron microscopy and biological applications [1­6]. The block copolymers template the arrangement of metal oxide nanoparticles within the polymer matrix. There are two general methods for the formation of such block copolymer metal

  11. Er doped oxide nanoparticles in silica based optical fibres

    CERN Preprints

    Blanc, Wilfried; Paul, M C

    2009-01-01

    Erbium doped materials are of great interest in optical telecommunications due to the Er3+ intra-4f emission at 1.54 ?m. Erbium doped fibre amplifiers (EDFA) were developed in silica glass because of the low losses at this wavelength and the reliability of this glass. Developments of new rare earth doped fibre amplifiers aim to control their spectroscopic properties including shape and width of the gain curve and optical quantum efficiency. Standard silica glass modifiers, such as aluminium, result in very good properties in current EDFA. However, for more drastic spectroscopic changes, more important modifications of the rare earth ions local environment are required. To address this aim, we present a fibre fabrication route creating rare earth doped calcia?silica or calcia?phosphosilica nanoparticles embedded in silica glass. By adding alkaline earth elements such as calcium, in low concentration, one can obtain a glass with an immisci- bility gap so that phase separation occurs with an appropriate heat tre...

  12. Interfacial activity of phosphonated-polyethylene glycol functionalized cerium oxide nanoparticles

    Condensed Matter (arXiv)

    L. Qi; J. Fresnais; P. Muller; O. Theodoly; J. -F. Berret; J. -P. Chapel

    2013-05-04

    In a recent publication, we have highlighted the potential of phosphonic acid terminated PEG oligomers to functionalize strong UV absorption cerium oxide nanoparticles[1], which yield suspensions that are stable in aqueous or organic solvents and are redispersible in different solvent after freeze-drying. In the present work, we highlight the interfacial activity of the functional ceria nanoparticles and their potential to modify hydrophobic surfaces. We first investigated Phosphonated-PEG amphiphilic oligomers behavior as strong surface active species forming irreversibly adsorbed layers. We then show that the oligomers interfacial properties translate to the functional nanoparticles. In particular, the addition of a small fraction of phosphonated-PEG oligomers with an extra C16 aliphatic chain (stickers) into the formulation enabled the tuning of i) the nanoparticles adsorption at the air/water, polystyrene/water, oil/water interfaces and ii) the particle/particle interaction in aqueous solutions. We also found that dense and closely packed two dimensional monolayers of nanoceria can be formed by spontaneous adsorption or surface compression using a Langmuir trough. A hexagonal organization controlled by reversible and repulsive repulsion has been characterized by GISAXS. Mono- or multilayers can also be stably formed or transferred on solid surfaces. Our results are key features in the field of polymer surface modification, solid stabilized emulsions (Pickering) or supracolloidal assemblies.

  13. Redispersible Hybrid Nanopowders: Cerium Oxide Nanoparticle Complexes with Phosphonated-PEG Oligomers

    Condensed Matter (arXiv)

    L. Qi; A. Sehgal; J. -C. Castaing; J. -P. Chapel; J. Fresnais; J. -F. Berret; F. Cousin

    2008-04-21

    Rare earth cerium oxide (ceria) nanoparticles are stabilized using end-functional phosphonated-PEG oligomers. The complexation process and structure of the resulting hybrid core-shell singlet nanocolloids are described, characterized and modeled using light and neutron scattering data. The adsorption mechanism is non-stoichiometric, yielding the number of adsorbed chains per particle Nads = 270 at saturation. Adsorption isotherms show a high affinity of the phosphonate head for the ceria surface (adsorption energy ~ -16 kT) suggesting an electrostatic driving force for the complexation. The ease, efficiency and integrity of the complexation is highlighted by the formation of nanometric sized cerium oxide particles covered with a well anchored PEG layer, maintaining the characteristics of the original sol. This solvating brush-like layer is sufficient to solubilize the particles and greatly expand the stability range of the original sol up to pH = 9. We underscore two key attributes of the tailored sol: i) strong UV absorption capability after functionalization and ii) ability to re-disperse after freeze-drying as powder in aqueous or organic solvents in varying concentrations as singlet nanocolloids. This robust platform enables translation of intrinsic properties of mineral oxide nanoparticles to critical end use.

  14. Stable, Efficient, and All-Solution-Processed Quantum Dot Light-Emitting Diodes with Double-Sided Metal Oxide Nanoparticle Charge

    Materials Science Websites

    Demir, Hilmi Volkan

    -Sided Metal Oxide Nanoparticle Charge Transport Layers Xuyong Yang, Yanyan Ma,, Evren Mutlugun,, Yongbiao Zhao, Department of Physics, UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Bilkent dot light- emitting diode (QLED) with double-sided metal oxide (MO) nanoparticle (NP) charge transport

  15. Electrogenerated Chemiluminescence of Partially Oxidized Highly Oriented Pyrolytic Graphite Surfaces and of Graphene Oxide Nanoparticles

    Engineering Websites

    platelets. Low-dimensional nanostructures (nanotubes, nanobelts, nanowires, nanorods, and nanosheets) of a variety of materials have been actively studied because of their distinctive geometries, novel physical suspension of graphene oxide platelets in an aqueous solution containing 0.1 M NaClO4, PBS (pH ) 7.0) and 13

  16. Design and synthesis of novel functionalized sensors for the biological imaging of zinc(II) and nitric oxide

    MIT - DSpace

    Won, Annie C., 1983-

    2005-01-01

    CHAPTER 1: Fluorescent Sensors for the Biological sensing of Zinc(II) A variety of fluorescent techniques have been developed for the in vivo sensing of Zn2+. This chapter presents a brief overview of techniques used to ...

  17. The Role of Organic Capping Layers of Platinum Nanoparticles in Catalytic Activity of CO Oxidation

    University of California eScholarship Repository

    Park, Jeong Y.

    2010-01-01

    1 shows SEM images of Pt nanoparticle arrays on a siliconthan that of the bare Pt nanoparticle surface with cappingPt nanoparticles compared to the single crystal is most likely associated with the higher number of kinks and edge sites at nanoparticle

  18. Purification of molybdenum oxide, growth and characterization of medium size zinc molybdate crystals for the LUMINEU program

    Nuclear Experiment (arXiv)

    V. N. Shlegel; L. Berge; R. S. Boiko; M. Chapellier; D. M. Chernyak; N. Coron; F. A. Danevich; R. Decourt; V. Ya. Degoda; L. Devoyon; A. Drillien; L. Dumoulin; C. Enss; A. Fleischmann; L. Gastaldo; A. Giuliani; M. Gros; S. Herve; I. M. Ivanov; V. V. Kobychev; Ya. P. Kogut; F. Koskas; M. Loidl; P. Magnier; E. P. Makarov; M. Mancuso; P. de Marcillac; S. Marnieros; C. Marrache-Kikuchi; S. G. Nasonov; X. F. Navick; C. Nones; E. Olivieri; B. Paul; Y. Penichot; G. Pessina; O. Plantevin; D. V. Poda; T. Redon; M. Rodrigues; O. Strazzer; M. Tenconi; L. Torres; V. I. Tretyak; Ya. V. Vasiliev; M. Velazquez; O. Viraphong; V. N. Zhdankov

    2013-12-12

    The LUMINEU program aims at performing a pilot experiment on neutrinoless double beta decay of 100Mo using radiopure ZnMoO4 crystals operated as scintillating bolometers. Growth of high quality radiopure crystals is a complex task, since there are no commercially available molybdenum compounds with the required levels of purity and radioactive contamination. This paper discusses approaches to purify molybdenum and synthesize compound for high quality radiopure ZnMoO4 crystal growth. A combination of a double sublimation (with addition of zinc molybdate) with subsequent recrystallization in aqueous solutions (using zinc molybdate as a collector) was used. Zinc molybdate crystals up to 1.5 kg were grown by the low-thermal-gradient Czochralski technique, their optical, luminescent, diamagnetic, thermal and bolometric properties were tested.

  19. Purification of molybdenum oxide, growth and characterization of medium size zinc molybdate crystals for the LUMINEU program

    CERN Preprints

    Shlegel, V N; Boiko, R S; Chapellier, M; Chernyak, D M; Coron, N; Danevich, F A; Decourt, R; Degoda, V Ya; Devoyon, L; Drillien, A; Dumoulin, L; Enss, C; Fleischmann, A; Gastaldo, L; Giuliani, A; Gros, M; Herve, S; Ivanov, I M; Kobychev, V V; Kogut, Ya P; Koskas, F; Loidl, M; Magnier, P; Makarov, E P; Mancuso, M; de Marcillac, P; Marnieros, S; Marrache-Kikuchi, C; Nasonov, S G; Navick, X F; Nones, C; Olivieri, E; Paul, B; Penichot, Y; Pessina, G; Plantevin, O; Poda, D V; Redon, T; Rodrigues, M; Strazzer, O; Tenconi, M; Torres, L; Tretyak, V I; Vasiliev, Ya V; Velazquez, M; Viraphong, O; Zhdankov, V N

    2013-01-01

    The LUMINEU program aims at performing a pilot experiment on neutrinoless double beta decay of 100Mo using radiopure ZnMoO4 crystals operated as scintillating bolometers. Growth of high quality radiopure crystals is a complex task, since there are no commercially available molybdenum compounds with the required levels of purity and radioactive contamination. This paper discusses approaches to purify molybdenum and synthesize compound for high quality radiopure ZnMoO4 crystal growth. A combination of a double sublimation (with addition of zinc molybdate) with subsequent recrystallization in aqueous solutions (using zinc molybdate as a collector) was used. Zinc molybdate crystals up to 1.5 kg were grown by the low-thermal-gradient Czochralski technique, their optical, luminescent, diamagnetic, thermal and bolometric properties were tested.

  20. The "Calamines" and the "Others": The great family of supergene nonsulfide zinc ores

    Geosciences Websites

    Boni, Maria

    Review The "Calamines" and the "Others": The great family of supergene nonsulfide zinc ores Maria, nonsulfide zinc deposits have been distinguished between supergene and hypogene, according, and oxidized concentrations characterized by different metals only locally associated with zinc. The Zn

  1. The Synthesis of Novel Metal and Metal Oxide Nanoparticles with Applications Towards Catalysis

    University of California eScholarship Repository

    McMurdo, Meredith Joanne

    2010-01-01

    electrode (nanoparticle-modified nickel foam) was suspendednickel foam electrodes modified with the three ferrite nanoparticlenanoparticle modified anodes. Linear scan voltammograms were collected on nickel

  2. Synthesis and Characterization of Magnetic Nanoparticles with High Magnetization and Good Oxidation Resistibility

    MIT - DSpace

    Yu, Shi

    Magnetic nanoparticles attract increasing attention because of their current and potential biomedical applications, such as, magnetically targeted and controlled drug delivery, magnetic hyperthermia and magnetic extraction. ...

  3. Electrical and Optical Properties of Transparent Conducting Homologous Compounds in the IndiumGalliumZinc Oxide System

    Chemistry Websites

    Poeppelmeier, Kenneth R.

    TRANSPARENT conducting oxides (TCOs) are used in a wide variety of applications, such as flat-panel displays, smart windows, and solar cells. Tin-doped indium oxide (ITO) is the commercial TCO of choice. ITO thin, and lower cost are desired for use in demanding ap- plications such as next-generation flat-panel displays

  4. In vivo imaging of immune cell dynamics in skin in response to zinc-oxide nanoparticle exposure

    Engineering Websites

    Boppart, Stephen

    properties of ZnO enables high contrast detection of the NPs in the presence of strong autofluorescence by cosmetic pigments and sunscreen agents under solar exposure and artificial UV illumination," J. Oleo Sci

  5. Electro-oxidation of formate-based solutions on Au/Pd coreeshell nanoparticles e Experiment

    Energy Storage, Conversion and Utilization Websites

    Liu, Fuqiang

    could enhance the oxidation of formate species. In addition, theoretical studies suggested lower formate catalysts toward formic acid oxidation (FAO). This involves efficient oxidization of reaction intermediates to the majority of current densities during the oxidation reactions. This finding could potentially open up new

  6. Preparation of PtNi Nanoparticles for the Electrocatalytic Oxidation of Methanol

    MIT - DSpace

    Deivaraj, T.C.

    Carbon supported PtNi nanoparticles were prepared by hydrazine reduction of Pt and Ni precursor salts under different conditions, namely by conventional heating (PtNi-1), by prolonged reaction at room temperature (PtNi-2) ...

  7. Functionalized Europium Oxide Nanoparticles Used as a Fluorescent Label in an Immunoassay

    Biotechnology Websites

    Hammock, Bruce D.

    preparing inorganic phosphor nanoparticles of Eu2O3 as labels in biology has been demonstrated with a simple of the particles and provides amine groups that can be used for biological conjugation. The surface layer also technique in biology.1 The labels are often organic dyes that give rise to the usual problems of broad

  8. Laser Light-Scattering Studies of Poly(caprolactone-b-ethylene oxide-b-caprolactone) Nanoparticles

    Chemistry Websites

    Wu, Chi

    the resultant nanoparticles and studied their biodegradation in the presence of enzyme lipase PS. The results revealed that the biodegradation rate was mainly dependent on the enzyme concentration. The scattering- ticles, indicating that the degradation of each particle was fast and the enzyme con- sumed

  9. Effect of electric field on the photoluminescence of polymer-inorganic nanoparticles composites

    Condensed Matter (arXiv)

    A. N. Aleshin; I. P. Shcherbakov; E. L. Alexandrova; E. A. Lebedev

    2008-01-29

    We report on the effect of electric field on the photoluminescence, PL, from a composite consisting of a conjugated polymer mixed with zinc oxide nanoparticles. We have found that in the absence of electric field PL emission from the composite film has two maxima in the blue and green-yellow regions. Application of a voltage bias to planar gold electrodes suppresses the green-yellow emission and shifts the only PL emission maximum towards the blue region. Current-voltage characteristics of the polymer-nanoparticles composite exhibit the non-linear behavior typical of non-homogeneous polymer-inorganic structures. Generation of excited states in the composite structure implies the presence of several radiative recombination mechanisms including formation of polymer-nanoparticle complexes including exciplex states and charge transfer between the polymer and nanoparticle that can be controlled by an electric field.

  10. Electrostatic co-assembly of iron oxide nanoparticles and polymers : towards the generation of highly persistent superparamagnetic nanorods

    Condensed Matter (arXiv)

    J. Fresnais; J. -F. Berret; B. Frka-Petesic; O. Sandre; R. Perzynski

    2009-01-17

    A paradigm proposed recently by Boal et al. (A.K. Boal et al., Nature 404, 746-748, 2000) deals with the possibility to use inorganic nanoparticles as building blocks for the design and fabrication of colloidal and supracolloidal assemblies. It is anticipated that these constructs could be made of different shapes, patterns and functionalities and could constitute the components of future nanodevices including sensors, actuators or nanocircuits. Here we report a protocol that allowed us to fabricate such nanoparticle aggregates. The building blocks of the constructs were anionically coated iron oxide nanocrytals (superparamagnetic, size 7 nm) and cationic-neutral block copolymers. We have shown that the electrostatic interactions between charged species can be controlled by tuning the ionic strength of the dispersion. Under appropriate conditions, the control of electrostatics resulted in the elaboration of spherical or elongated aggregates at the micrometer length scale. The elongated aggregates were found to be rod-like, with diameters of a few hundred nanometers and lengths between 1 and 50 micrometers. In addition to their remarkable stiffness, the nanostructured rods were found to reorient along with an externally applied magnetic field, in agreement with the laws of superparamagnetism.

  11. The role of the coating and aggregation state in the interactions between iron oxide nanoparticles and 3T3 fibroblasts

    CERN Preprints

    Safi, Malak; 10.1016/j.phpro.2010.11.059

    2011-01-01

    Recent nanotoxicity studies revealed that the physico-chemical characteristics of engineered nanomaterials play an important role in the interactions with living cells. Here, we report on the toxicity and uptake of the iron oxide sub-10 nm nanoparticles by NIH/3T3 mouse fibroblasts. Coating strategies include low-molecular weight ligands (citric acid) and polymers (poly(acrylic acid), MW = 2000 g mol-1). We find that most particles were biocompatible, as exposed cells remained 100% viable relative to controls. The strong uptake shown by the citrate-coated particles is related to the destabilization of the dispersions in the cell culture medium and their sedimentation down to the cell membranes.

  12. Preventing corona effects: multi-phosphonic acid poly(ethylene glycol) copolymers for stable stealth iron oxide nanoparticles

    CERN Preprints

    Torrisi, V; Vitorazi, L; Crouzet, Q; Marletta, G; Loubat, C; Berret, J -F

    2014-01-01

    When disperse in biological fluids, engineered nanoparticles are selectively coated with proteins, resulting in the formation of a protein corona. It is suggested that the protein corona is critical in regulating the conditions of entry into the cytoplasm of living cells. Recent reports describe this phenomenon as ubiquitous and independent of the nature of the particle. For nanomedicine applications however, there is a need to design advanced and cost-effective coatings that are resistant to protein adsorption and that increase the biodistribution in vivo. In this study, phosphonic acid poly(ethylene glycol) copolymers were synthesized and used to coat iron oxide particles. The copolymer composition was optimized to provide simple and scalable protocols as well as long-term stability in culture media. It is shown that polymers with multiple phosphonic acid functionalities and PEG chains outperform other types of coating, including ligands, polyelectrolytes and carboxylic acid functionalized PEG. PEGylated pa...

  13. Synthesis of Zinc Ferrites in RF Thermal Plasma Reactor , I. Mohai1

    Materials Science Websites

    Gubicza, Jenõ

    Synthesis of Zinc Ferrites in RF Thermal Plasma Reactor L. Gál1* , I. Mohai1 , I. Mészáros3 , J Formation of nanosized zinc ferrite spinels was studied from iron- and zinc oxide powders and corresponding of nanosized, inverse zinc ferrites of high saturation magnetisation were established. It was proved

  14. Genome-wide characterization of the Zap1p zinc-responsive regulon in yeast

    Biology and Medicine Websites

    Botstein, David

    important for zinc homeostasis, a systematic study of gene expression on the genome-wide scale was used to advance our understanding of zinc homeostasis in yeast. Zinc is an essential nutrient. Being oxidatively in ischemic injury (8). These observations highlight the importance of zinc homeostasis. Despite a wealth

  15. Single photon emission from ZnO nanoparticles

    CERN Preprints

    Choi, Sumin; Castelletto, Stefania; Ton-That, Cuong; Phillips, Matthew R; Aharonovich, Igor

    2014-01-01

    Room temperature single photon emitters are very important resources for photonics and emerging quantum technologies. In this work we study single photon emission from defect centers in 20 nm zinc oxide (ZnO) nanoparticles. The emitters exhibit bright broadband fluorescence in the red spectral range centered at 640 nm with polarized excitation and emission. The studied emitters showed continuous blinking, however, bleaching can be suppressed using a polymethyl methacrylate (PMMA) coating. Furthermore, hydrogen termination increased the density of single photon emitters. Our results will contribute to the identification of quantum systems in ZnO.

  16. Interaction Potential Models for Bulk ZnS, ZnS Nanoparticle, and ZnS Nanoparticle-PMMA From

    Engineering Websites

    Singh, Jayant K.

    proteins with ZnS surface in water solvents. ZnS nanoparticles are optically active in the UV-visible rangeInteraction Potential Models for Bulk ZnS, ZnS Nanoparticle, and ZnS Nanoparticle-PMMA From First polarizable force-field has been developed for Zinc sulphide (ZnS) nanoparticle (NP) and ZnS NP

  17. The general synthesis of Ag nanoparticles anchored on silver vanadium oxides: towards high

    Materials Science Websites

    Cao, Guozhong

    performance cathodes for lithium-ion batteries Jiang Zhou,a Qiang Liang,a Anqiang Pan,*a Xuelin Zhang,a Qinyu­9 In particular, SVOs with a variety of oxidation states have found a suitable application in lithium batteries for primary lithium batteries, because of their high energy density and unsatisfac- tory cycling behavior

  18. Observation of asymmetric spectrum broadening induced by silver nanoparticles in a heavy-metal oxide glass

    CERN Preprints

    Zhavoronkov, N; Bregadiolli, B A; Nalin, M; Malomed, B A

    2011-01-01

    We demonstrate experimentally and support by a theoretical analysis an effect of asymmetric spectrum broadening, which results from doping of silver nanoparticles into a heavy-glass matrix, 90(0.5WO3-0.3SbPO4-0.2PbO)-10AgCl. The strong dispersion of the effective nonlinear coefficient of the composite significantly influences the spectral broadening via the self-phase modulation, and leads to a blue upshift of the spectrum. Further extension of the spectrum towards shorter wavelengths is suppressed by a growing loss caused by the plasmon resonance in the silver particles. The red-edge spectral broadening is dominated by the stimulated Raman Scattering.

  19. Characterizing oxides with low cation substitution Ram Seshadri

    Mathematics Websites

    Bigelow, Stephen

    Baars, Seshadri, J. Mater. Chem. (2009) #12;Outline: 1. Cation substituted zinc oxides: Isovalent substitution) 1418; 20 (2008) 6567.] #12;Cation substituted zinc oxides #12;Cation-substituted ZnO: Magnetism

  20. Semiconducting and Piezoelectric Oxide Nanostructures Induced by Polar Surfaces**

    Materials Science Websites

    Wang, Zhong L.

    transport along the nanobelt has been mea- sured.[14] Zinc oxide (ZnO) is the most typical and successful example of oxide nanobelts. Zinc oxide has three key advan- tages. First, it is a semiconductor for biomedical applications without coating. Zinc is also an element that is needed by everyone. The daily

  1. Synthesis of Nickel-Zinc Ferrites in RF Thermal Plasma Reactor J. Szpvlgyi1,2*

    Materials Science Websites

    Gubicza, Jenõ

    Synthesis of Nickel-Zinc Ferrites in RF Thermal Plasma Reactor J. Szépvölgyi1,2* , I. Mohai1 , L POB 32, Budapest, Hungary Abstract Nickel-zinc ferrites usually exhibit high saturation mag. In this paper results of thermal plasma synthesis of nanosized nickel-zinc ferrites from oxide powders

  2. Zinc sorption to biogenic hexagonal-birnessite particles within a hydrated bacterial biofilm

    Physics Websites

    Zinc sorption to biogenic hexagonal-birnessite particles within a hydrated bacterial biofilm Brandy- monas putida. The biogenic Mn oxide is a c-disordered birnessite with hexagonal layer symmetry. Zinc spectra. Zinc speciation was found to change as Zn loading to the biosorbent [bacterial cells

  3. Metabolic networks to combat zinc toxicity in Pseudomonas fluorescens Azhar Alhasawi

    Biology and Medicine Websites

    Appanna, Vasu

    Metabolic networks to combat zinc toxicity in Pseudomonas fluorescens By Azhar Alhasawi Thesis from zinc (Zn), an environmental pollutant. Under Zn stress, this microbe survived despite the fact environment. This metabolic shift is critical to counter the oxidative stress triggered by zinc toxicity

  4. Nanoparticle growth following photochemical a-and b-pinene oxidation at Appledore Island during International Consortium for

    Geosciences Websites

    Pierce, Jeffrey

    submicron and supermicron particles included high maximum concentrations of methane sulfonate, sulfate for heterogeneous reactions. Gas-to-nanoparticle conversion differs from gas-to-large-particle processes because over 90 nm in size is the central question of this study. [3] A comprehensive review by Kulmala et al

  5. Structure Determination of the One-Dimensional Compound Sr3ZnPtO6, Containing Zinc in a

    Materials Science Websites

    zur Loye, Hans-Conrad

    Structure Determination of the One-Dimensional Compound Sr3ZnPtO6, Containing Zinc in a HighlyVember 9, 1995 We report the synthesis and structure of a new zinc-containing strontium platinum oxide, Sr3ZnPtO6, in which zinc is present in a highly unusual trigonal prismatic coordination environment

  6. Controlled oxidation of FeCo magnetic nanoparticles to produce faceted FeCo/ferrite nanocomposites for rf heating applications

    Materials Science Websites

    Laughlin, David E.

    and M. E. McHenry1,2 1 Department of Materials Science and Engineering, Carnegie Mellon University the FeCo core and oxide shell. We show HRTEM images of MNP chaining and compare the rf heating of samples and oxidation products in FeCo/ferrite nanocomposite materials and their influence on applications.4 We report

  7. 1 Core/Shell Au/CuPt Nanoparticles and Their Dual Electrocatalysis for 2 Both Reduction and Oxidation Reactions

    Materials Science Websites

    Wang, Zhong L.

    usage but also improves the 15 stability of the Au/CuPt catalyst for fuel cell reactions. The results for fuel cell reactions, we noticed 51that Au/FePt3 NPs with a 1.5 nm FePt3 shell showed much 52improved suggest that the core/shell 16 design is indeed effective for optimizing nanoparticle catalysis. The same

  8. Study of High Temperature Thermal Behavior of Alkyl and Perfluoroalkylsilane Molecules Self-Assembled on Titanium Oxide Nanoparticles

    CERN Preprints

    Prakash, P; Devaprakasama, D

    2014-01-01

    We have studied high temperature thermal behavior of 1H, 1H, 2H, 2H-Perfluorooctyl-trichlorosilane (FOTS) and Octyltrichlorosilane (OTS) molecules self assembled on titanium dioxide (TiO2) nanoparticles using advanced microscopy and spectroscopy technique such as Scanning Electron Microscope (SEM), Dynamic Light Scattering (DLS), X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). FOTS SAM and OTS SAM coated TiO2 nanoparticles were heated to different temperature range from room temperature (RT) to 550oC. We characterized nano-microstructure and size distribution of FOTS SAM and OTS SAM coated TiO2 nanoparticles, which were heat-treated to different peak temperatures, using SEM and DLS techniques. The thermal stability and degradation of FOTS SAM and OTS SAM coated TiO2 were carried out using FTIR spectroscopy. We found that FOTS SAM on TiO2 is very stable up to 450oC and OTS on TiO2 is stable up to 250oC. Peak frequency, peak intensity and full width half maxima (FWHM) of symmetric an...

  9. Nanoparticle "theranostic" platforms for applications in cancer

    University of California eScholarship Repository

    Steiner, Jason Michael

    2011-01-01

    homogeneous emulsions that the polymer can form whilepolymers, liposomes, metals, oxides, dendrimers, emulsions,emulsion formation and initial gold seed diameter. The ability to encapsulate nanoparticles in polymer

  10. ZINC-AIR MICROBATTERY WITH ELECTRODE ARRAY OF ZINC MICROPOSTS

    Engineering Websites

    Kim, Chang-Jin "CJ"

    ZINC-AIR MICROBATTERY WITH ELECTRODE ARRAY OF ZINC MICROPOSTS Fardad Chamran1 , Hong-Seok Min2 development of a high performance MEMS-fabricated zinc-air microbattery. The key feature of this battery is the 3-dimensional architecture of the zinc electrode, which consists of an array of high aspect ratio

  11. Differential proteomics analysis of the surface heterogeneity of dextran iron oxide nanoparticles and the implications for their in vivo clearance

    MIT - DSpace

    Simberg, Dmitri

    In order to understand the role of plasma proteins in the rapid liver clearance of dextran-coated superparamagnetic iron oxide (SPIO) in vivo, we analyzed the full repertoire of SPIO-binding blood proteins using novel ...

  12. One-Pot Synthesis of Platinum Nanoparticles Embedded on Reduced Graphene Oxide for Oxygen Reduction in Methanol

    Engineering Websites

    - ported on reduced graphene oxide (RG-O) platelets via a modified polyol method. Compared to Johnson electrochemical surface area, greater catalytic activity towards the oxygen reduction reaction (ORR catalyst and the occurrence of a mixed potential.3,4 In order to further maximize the activity of Pt

  13. Scaling properties in the adsorption of ionic polymeric surfactants on generic nanoparticles of metallic oxides by mesoscopic simulation

    Condensed Matter (arXiv)

    E. Mayoral; E. Nahmad-Achar

    2014-02-11

    We study the scaling of adsorption isotherms of polyacrylic dispersants on generic surfaces of metallic oxides $XnOm$ as a function of the number of monomeric units, using Electrostatic Dissipative Particle Dynamics simulations. The simulations show how the scaling properties in these systems emerge and how the isotherms rescale to a universal curve, reproducing reported experimental results. The critical exponent for these systems is also obtained, in perfect agreement with the scaling theory of deGennes. Some important applications are mentioned.

  14. Scaling properties in the adsorption of ionic polymeric surfactants on generic nanoparticles of metallic oxides by mesoscopic simulation

    CERN Preprints

    Mayoral, E

    2014-01-01

    We study the scaling of adsorption isotherms of polyacrylic dispersants on generic surfaces of metallic oxides $XnOm$ as a function of the number of monomeric units, using Electrostatic Dissipative Particle Dynamics simulations. The simulations show how the scaling properties in these systems emerge and how the isotherms rescale to a universal curve, reproducing reported experimental results. The critical exponent for these systems is also obtained, in perfect agreement with the scaling theory of deGennes. Some important applications are mentioned.

  15. Tuning the Curie temperature in -FeNi nanoparticles for magnetocaloric applications by controlling the oxidation kinetics

    Materials Science Websites

    Laughlin, David E.

    the oxidation kinetics Huseyin Ucar, John J. Ipus, D. E. Laughlin, and M. E. McHenry Citation: J. Appl. Phys. Related Articles Synthesis and magnetic properties of core/shell FeO/Fe3O4 nano-octopods J. Appl. Phys method J. Appl. Phys. 113, 17A313 (2013) Grain size effect on magnetic and electric properties of LuMnO3

  16. Infrared spectroscopy of ZnO nanoparticles containing CO2 impurities W. M. Hlaing Oo and M. D. McCluskeya

    Physics Websites

    McCluskey, Matthew

    Institute of Physics. DOI: 10.1063/1.1866511 Zinc oxide ZnO is a wide-band gap semiconductor synthesized by a variety of wet-chemistry methods. The use of precursor materials such as zinc acetate, zinc nitrate, or zinc carbonate provides an efficient way to synthesize the ZnO particles.6­8 However, a major

  17. Evaluation of nanoparticles-based thermotherapy for cancer

    MIT - DSpace

    Wiryaatmadja, Edwina

    2007-01-01

    Under alternating magnetic field, superparamagnetic iron oxide nanoparticles can be used to generate heat for the treatment of cancer. With suitable coating, these nanoparticles are biocompatible, stable in solution, and ...

  18. Long-wavelength, reaction-based, fluorescent sensors for HNO and mobile zinc

    MIT - DSpace

    Wrobel, Alexandra T

    2014-01-01

    Chapter 1. Introduction A variety of inorganic molecules and ions participate in complex biological signaling networks. Three of these species are nitric oxide (NO), nitroxyl (HNO), and mobile zinc. Maintaining the homeostasis ...

  19. Imaging mobile zinc in biology

    MIT - DSpace

    Tomat, Elisa

    Trafficking and regulation of mobile zinc pools influence cellular functions and pathological conditions in multiple organs, including brain, pancreas, and prostate. The quest for a dynamic description of zinc distribution ...

  20. Solution grown antimony doped zinc oxide films

    University of California eScholarship Repository

    Riley, Conor T.

    2012-01-01

    P. D,; Nanowire dye-sensitized solar cells, Nat. Mater.nanowire integrated three-dimensional dye- sensitized solar cells,nanowire hybrid structures for efficient three-dimensional dye-sensitized solar cells,

  1. Received: 17 November 2009, Revised: 9 April 2010, Accepted: 15 April 2010, Published online in Wiley Online Library: 2010 Cytotoxicity of iron oxide nanoparticles made

    Materials Science Websites

    Krishnan, Kannan M.

    . Kushleikac , Michael E. Rosenfeldc and Kannan M. Krishnana * Magnetic nanoparticles are promising molecular to tailor biodistribution. In this work we describe the synthesis of magnetic nanoparticles using organic and have uniform size and shape. The ability to create a monodispersion of particles of the same size

  2. Forces between functionalized silica nanoparticles in solution

    Condensed Matter (arXiv)

    J. Matthew D. Lane; Ahmed E. Ismail; Michael Chandross; Christian D. Lorenz; Gary S. Grest

    2009-04-16

    To prevent the flocculation and phase separation of nanoparticles in solution, nanoparticles are often functionalized with short chain surfactants. Here we present fully-atomistic molecular dynamics simulations which characterize how these functional coatings affect the interactions between nanoparticles and with the surrounding solvent. For 5 nm diameter silica nanoparticles coated with poly(ethylene oxide) (PEO) oligomers in water, we determined the hydrodynamic drag on two approaching nanoparticles moving through solvent and on a single nanoparticle as it approaches a planar surface. In most circumstances, acroscale fluid theory accurately predicts the drag on these nano-scale particles. Good agreement is seen with Brenner's analytical solutions for wall separations larger than the soft nanoparticle radius. For two approaching coated nanoparticles, the solvent-mediated (velocity-independent) and lubrication (velocity-dependent) forces are purely repulsive and do not exhibit force oscillations that are typical of uncoated rigid spheres.

  3. Nanoparticles as Reactive Precursors: Synthesis of Alloys, Intermetallic Compounds, and Multi-Metal Oxides Through Low-Temperature Annealing and Conversion Chemistry 

    Texas A&M University - TxSpace

    Bauer, John C.

    2010-07-14

    of metal salts in an aqueous solution and stabilized by PVP (polyvinylpyrrolidone), were mixed into nanoparticle composites in stoichometric proportions. The composite mixtures were then annealed at relatively low temperatures to form alloy...

  4. Photoelectrochemical studies of chalcogenide nanoparticles

    CERN Preprints

    Hickey, S G

    2001-01-01

    the bleaching occurs only when electrons are injected into the conduction band of the nanoparticles and charge transfer to surface states does not affect the absorption. The significance of the results are discussed with reference to the various models of absorbance bleaching in semiconductor nanoparticles. The effect of particle size on the charge transfer processes is examined and the results discussed with respect the distance dependence of the electron tunnelling rate. It is then demonstrated that the particle deposition strategy employed for CdS nanoparticles may be extended to HgS. This thesis is primarily concerned with the (opto)electrochemical investigation of the dynamics of charge separation at tin oxide electrodes derivatised with sub-monolayers of CdS nanoparticles. First a novel method of preparing CdS nanoparticle-modified electrodes is described and it is demonstrated that the particles deposited onto the substrate are representative of those formed in the sol. Employing the technique of inten...

  5. Interactions of Copper Nanoparticles with the Microalgae, Chlamydomonas reinhardtii

    University of California eScholarship Repository

    Spitzmiller, Melissa Rae

    2012-01-01

    functions, as the copper protein plastocyanin is required asprotein oxidation, osmotic burst, and the disruption of the cell membrane (Figure 2). Coppercopper nanoparticles on the microalgae, C. reinhardtii, include ROS generation and direct oxidation of proteins,

  6. Spectral-domain magnetomotive OCT imaging of magnetic nanoparticle biodistribution

    Physics Websites

    Oldenburg, Amy

    coherence tomography (MMOCT) is a method for imaging the distribution of magnetic nanoparticles in tissue embedded with iron oxide nanoparticles (~20 nm) also provide negative T2 contrast in magnetic resonance for molecular imaging using targeted magnetic nanoparticles. Keywords: optical coherence tomography, contrast

  7. Synthesis of Different Zinc and Zinc Included Nanostructures by High Power Copper Vapor Laser Ablation in Water- Surfactants Solutions

    CERN Preprints

    Karpukhin, Vyacheslav T; Borodina, Tatyana; Valyano, E G; Gololobova, O A

    2011-01-01

    The data of experimental studies of optical characteristics of colloidal solutions, composition and morphology of its dispersed phase, resulting from laser ablation of zinc in aqueous solutions of anionic surfactants --- sodium dodecyl sulfate (SDS), dioctyl sodium sulfosuccinate (AOT) are presented. It is shown that by studying the optical absorption spectra of the colloid, X-ray spectra and AFM-images of extracted from colloid solid phase, it is possible to trace the dynamics of ZnO nanostructures formation from zinc nanoclasters size of several nanometers to ZnO fractal aggregates (FA) size up to hundreds of nanometers. Determinants of this process are the average power and an ablation exposure, the frequency of the laser pulses, the colloid aging time, the type and concentration of surfactant in solution. In the selection of appropriate regimes, along with zinc oxide obtained other nanoproducts --- hydrozincit and organo-inorganic layered composite \\ce{[(\\beta) - Zn(OH)2 + SDS]}.

  8. Magnetic Nanoparticles Size-Dependent Magnetic Properties of Colloidal

    Chemistry Websites

    Kim, Bongsoo

    Magnetic Nanoparticles Size-Dependent Magnetic Properties of Colloidal Mn3O4 and MnO Nanoparticles-oxide nanocrystals are expected to find useful applica- tions in catalysis, energy storage, magnetic data storage, sensors, and ferrofluids.[1] In particular, colloidal metal-oxide nanocrystals are of great interest

  9. Quantitative Contrast-Enhanced MRI with Superparamagnetic Nanoparticles Using Ultrashort

    Materials Science Websites

    Sridhar, Srinivas

    by elemental iron anal- ysis of sequential blood draws. Automated segmentation of ferumoxytol concentration iron oxide nanoparticle contrast agent with high sensitivity and precision in vitro and in vivo; superparamagnetic iron oxide nanoparticle (SPION) INTRODUCTION The ability to measure structural and functional

  10. Colloidal Plasmonic Titanium Nitride Nanoparticles: Properties and Applications

    CERN Preprints

    Guler, Urcan; Kildishev, Alexander V; Boltasseva, Alexandra; Shalaev, Vladimir M

    2014-01-01

    Optical properties of colloidal plasmonic titanium nitride nanoparticles are examined with an eye on their photothermal via transmission electron microscopy and optical transmittance measurements. Single crystal titanium nitride cubic nanoparticles with an average size of 50 nm exhibit plasmon resonance in the biological transparency window. With dimensions optimized for efficient cellular uptake, the nanoparticles demonstrate a high photothermal conversion efficiency. A self-passivating native oxide at the surface of the nanoparticles provides an additional degree of freedom for surface functionalization.

  11. Zinc oxide (ZnO) has attracted much interest during last decades as a functional material. It has been known as a conductive material when elements such as indium, gallium and aluminum are doped.

    Computer Technologies and Information Sciences Websites

    oxide (ITO), graphene, and carbon nanotube film. In addition, a new generation solar cell electrodes. The nanostructures for solar cells using inorganic materials such as silicon (Si), titanium oxide (TiO2), and ZnO have been an interesting topic for research in solar cell community in order

  12. Chem. Mater. 1994, 6, 2279-2287 2279 Chemical Vapor Deposition of Zinc from Diallyl Zinc

    Materials Science Websites

    Girolami, Gregory S.

    Chem. Mater. 1994, 6, 2279-2287 2279 Chemical Vapor Deposition of Zinc from Diallyl Zinc Precursors 24, 1994. Revised Manuscript Received August 23, 1994@ The organometallic compounds bis(ally1)zinc and bis(2-methylally1)zinc have been shown to serve as MOCVD precursors for the deposition of zinc

  13. Zinc Doping in Cosubstituted In2-2xSnxZnxO3-A. Ambrosini, S. Malo, and K. R. Poeppelmeier*

    Chemistry Websites

    Poeppelmeier, Kenneth R.

    Zinc Doping in Cosubstituted In2-2xSnxZnxO3- A. Ambrosini, S. Malo, and K. R. Poeppelmeier-type conductivity of the doped material decreases with zinc substitution. Zn-doped In1.6Sn0.2Zn0.2O3- was annealed-8% of SnO2 before a second phase is formed.10-12 Zinc oxide, ZnO, which forms a series of layered compounds

  14. Study of stability of ZnO nanoparticles and growth mechanisms of colloidal ZnO nanorods 

    Texas A&M University - TxSpace

    Lee, Kwang Jik

    2006-10-30

    After hydrolyzing zinc acetate in methanol solution, spherical ZnO nanoparticles in the size range from about 2.5 to 5 nm were synthesized by maintaining a ZnO concentration of 0.02M. Compared to ZnO nanoparticles prepared via other methods...

  15. A Low Temperature Fully Lithographic Process For Metal–Oxide Field-Effect Transistors

    MIT - DSpace

    Sodini, Charles G.

    We report a low temperature ( ~ 100à °C) lithographic method for fabricating hybrid metal oxide/organic field-effect transistors (FETs) that combine a zinc-indium-oxide (ZIO) semiconductor channel and organic, parylene, ...

  16. This work focuses on simulation of electrical resistivity and optical behaviors of thin films, where an Ag or Au thin layer is embedded in zinc oxide. Enhanced conductivity and

    Computer Technologies and Information Sciences Websites

    earlier achieved with multilayer structured transparent conducting oxide (TCO) sandwich layer with metal (TCO/metal/TCO). Sputtering pattern of metal layer is simulated to obtain the morphology, covered area fraction, and the percolation strength. The resistivity as a function of the metal layer thickness fits

  17. Cell Calcium 40 (2006) 393402 Determining zinc with commonly used calcium and zinc fluorescent

    Biology and Medicine Websites

    Li, Yang V.

    2006-01-01

    Cell Calcium 40 (2006) 393­402 Determining zinc with commonly used calcium and zinc fluorescent rights reserved. Keywords: Zinc; Calcium; Fluorescence; Fluorophore; Calcium Green-1; Fura-2; Fluo-3 Zn2+ and histo- chemically reactive free Zn2+ (chelatable Zn2+). Bound zinc, which makes up

  18. Characterisation of endogenous KRAB zinc finger proteins 

    Edinburgh, University of - Research Archive

    Crawford, Catherine

    2009-01-01

    The Krüppel-associated box (KRAB) zinc finger protein (ZFP) genes comprise one of the largest gene families in the mammalian genome, encoding transcription factors with an N-terminal KRAB domain and C-terminal zinc ...

  19. RESEARCH PAPER A mathematical model of superparamagnetic iron oxide

    Biology and Medicine Websites

    Wikswo, John

    RESEARCH PAPER A mathematical model of superparamagnetic iron oxide nanoparticle magnetic behavior oxide nanoparti- cles (SPIONs) exhibit unique magnetic properties that make them highly efficacious as MR imaging contrast agents and laboratory diagnostic tools. The complex- ity of SPION magnetic

  20. Fabrication of uniformly dispersed nanoparticle-doped chalcogenide glass Chao Lu, Juliana M. P. Almeida, Nan Yao, and Craig Arnold

    Engineering Websites

    Arnold, Craig B.

    and optical characterization of copper oxide nanoparticles using a high aspect ratio bio-template J. Appl of nanoparticle-protein corona Appl. Phys. Lett. 101, 263701 (2012); 10.1063/1.4772509 Photoexpansion and nano

  1. International Lead and Zinc Study Group

    Physics Websites

    Laughlin, Robert B.

    International Lead and Zinc Study Group 38 Rua Almirante Barroso 5th Floor Lisbon 1000-013 Portugal Tel: +351 21 359 24 20 Fax: +351 21 359 24 29 Web Site: www.ilzsg.org E-Mail: root@ilzsg.org LEAD AND ZINC STATISTICS Monthly bulletin of the International Lead and Zinc Study Group Vol 46 No 2 FEBRUARY

  2. Adding Search to Zinc Reza Rafeh1

    Computer Technologies and Information Sciences Websites

    Garcia de la Banda, Maria

    Adding Search to Zinc Reza Rafeh1 , Kim Marriott1 , Maria Garcia de la Banda1 , Nicholas Nethercote to the declar- ative modelling language Zinc that allows users to define model-specific search. This is achieved by providing a number of generic search pat- terns that take Zinc user-defined functions as parameters. We show

  3. Controlling Structure and Porosity in Catalytic Nanoparticle Superlattices with DNA

    Renewable Energy Websites

    subsequently investigate the ability of supported Au nanoparticle superlattices to catalyze alcohol oxidation. In addition to demonstrating that calcined superlattices are effective catalysts for alcohol oxidation for alcohol oxidation. This technique allows one to prepare a particle lattice with a well- defin

  4. This research reports on the investigation into the synthesis and stabilization of iron oxide nanoparticles for theranostic applications using amine-epoxide polymers. Although theranostic agents such as magnetic

    Computer Technologies and Information Sciences Websites

    such as magnetic nanoparticles have been designed and developed for a few decades, there is still more work to also have these nanoparticles possess high magnetic susceptibility in response to an applied magnetic chemical pathway to obtain magnetic nanoparticles. In literature, cationic polymers

  5. Zinc and Health: Current Status and Future Directions Zinc Transport in the Brain: Routes of Zinc Influx and Efflux in Neurons1,2

    Biology and Medicine Websites

    Zinc and Health: Current Status and Future Directions Zinc Transport in the Brain: Routes of Zinc and that mediate extracellular zinc toxicity and (3) a plasma membrane transporter potentially present in all of mechanism, is the transporter pathway. The kinetics of zinc uptake in cultured neurons under resting

  6. Optimization of nanoparticle core size for magnetic particle imaging R. Matthew Ferguson a

    Materials Science Websites

    Krishnan, Kannan M.

    and humans. With direct NMP detection, MPI should achieve greater sensitivity than magnetic resonance imagingOptimization of nanoparticle core size for magnetic particle imaging R. Matthew Ferguson a , Kevin Keywords: Magnetic nanoparticle Magnetic particle imaging Iron oxide nanoparticle Contrast agent Molecular

  7. Catalysis of Elemental Sulfur Nanoparticles on Chromium(VI)

    Engineering Websites

    Deng, Baolin

    Catalysis of Elemental Sulfur Nanoparticles on Chromium(VI) Reduction by Sulfide under Anaerobic oxidation was elemental sulfur. Under the anaerobic condition, the reaction was pseudo first order initially acceleration was due to catalysis by elemental sulfur nanoparticles; dissolved species such as monomeric

  8. Intracellular Delivery of siRNA by Polycationic Superparamagnetic Nanoparticles

    MIT - DSpace

    Castillo, Betzaida

    2012-01-01

    The siRNA transfection efficiency of nanoparticles (NPs), composed of a superparamagnetic iron oxide core modified with polycationic polymers (poly(hexamethylene biguanide) or branched polyethyleneimine), were studied in ...

  9. Tailoring magnetic properties of core/shell nanoparticles and Shouheng Sun

    Materials Science Websites

    Liu, J. Ping

    theoretical predictions. These bimagnetic core/shell nanoparticles represent a class of nanostructured of nearly monodisperse magnetic nanoparticles from metallic Fe, Co and Ni, to iron oxides, MFe2O4 and Fe simultaneously as reported before.6 The iron oxide coating was achieved via mixing and heating the Fe

  10. Dopants in nanoscale ZnO Matthew D. McCluskey,1

    Physics Websites

    McCluskey, Matthew

    Washington State University, Pullman, WA 99164-2814 ABSTRACT Zinc oxide (ZnO) is a metal-oxide semiconductor Nanoparticles were produced by the chemical reaction of zinc acetate dihydrate with sodium hydrogen carbonate

  11. Modulation of extrasynaptic NMDA receptors by synaptic and tonic zinc

    MIT - DSpace

    Anderson, Charles T.

    Many excitatory synapses contain high levels of mobile zinc within glutamatergic vesicles. Although synaptic zinc and glutamate are coreleased, it is controversial whether zinc diffuses away from the release site or whether ...

  12. The marine biogeochemistry of zinc isotopes

    MIT - DSpace

    John, Seth G

    2007-01-01

    Zinc (Zn) stable isotopes can record information about important oceanographic processes. This thesis presents data on Zn isotopes in anthropogenic materials, hydrothermal fluids and minerals, cultured marine phytoplankton, ...

  13. Amorphous oxide semiconductors are promising new materials for various optoelectronic applications. In this study, improved electrical and optical properties upon thermal and microwave processing of

    Computer Technologies and Information Sciences Websites

    -assisted microwave annealing. Mixed oxide semiconductor films of indium zinc oxide (IZO) and indium gallium zinc in electrical properties of the thin films upon annealing in oxygen was assessed by subjecting samples to subsequent vacuum anneals. To further increase the conductivity of the IGZO films, Ag layers of various

  14. Magnetic Susceptibility of NiO Nanoparticles

    Condensed Matter (arXiv)

    S. D. Tiwari; K. P. Rajeev

    2004-08-19

    Nickel oxide nanoparticles of different sizes are prepared and characterized by x-ray diffraction and transmission electron microscopy. A.C. susceptibility measurements as a function of temperature are carried out for various particle sizes and frequencies. We find that the behavior of the system is spin glass like.

  15. Nanoparticle Assembly at Fluid Interfaces: Structure and Yao Lin, Alexander Boker, Habib Skaff, David Cookson, A. D. Dinsmore,*,

    Materials Science Websites

    Dinsmore, Tony

    . With spherical, tri-n-octyl-phosphine-oxide covered cadium selenide (CdSe) nanoparticles (1-8 nm), thermal Section Tri-n-octyl-phosphine-oxide (TOPO) covered CdSe nanopar- ticles were prepared as described

  16. Phosphorescent sensor for biological mobile zinc

    MIT - DSpace

    You, Youngmin

    A new phosphorescent zinc sensor (ZIrF) was constructed, based on an Ir(III) complex bearing two 2-(2,4-difluorophenyl)pyridine (dfppy) cyclometalating ligands and a neutral 1,10-phenanthroline (phen) ligand. A zinc-specific ...

  17. Variable-Temperature Electrical Measurements of Zinc Oxide/Tin Oxide-Cosubstituted Indium Oxide

    Chemistry Websites

    Poeppelmeier, Kenneth R.

    as transparent electrodes in solar cells, flat panel displays, and many other applications. The commercial TCO: Flat Panel Display Mater. Large Area Processes 1998, 508, 308. (4) Minami, T.; Takata, S.; Kakumu, T

  18. Zinc abundances of planetary nebulae

    CERN Preprints

    Smith, Christina L; Dinerstein, Harriet L

    2014-01-01

    Zinc is a useful surrogate element for measuring Fe/H as, unlike iron, it is not depleted in the gas phase media. Zn/H and O/Zn ratios have been derived using the [Zn IV] emission line at 3.625um for a sample of nine Galactic planetary nebulae, seven of which are based upon new observations using the VLT. Based on photoionization models, O/O++ is the most reliable ionisation correction factor for zinc that can readily be determined from optical emission lines, with an estimated accuracy of 10% or better for all targets in our sample. The majority of the sample is found to be sub-solar in [Zn/H]. [O/Zn] in half of the sample is found to be consistent with Solar within uncertainties, whereas the remaining half are enhanced in [O/Zn]. [Zn/H] and [O/Zn] as functions of Galactocentric distance have been investigated and there is little evidence to support a trend in either case.

  19. (45) 20090817 (11) 10-0912495

    Physics Websites

    Park, Byungwoo

    ), (zinc bromide), (zinc chloride), (zinc fluoride), (zinc carbonate), (zinc cyanide), (zinc nitrate + ) . , , . , . (dimethyl zinc), (diethyl zinc), (zinc acetylacetonate), (zinc iodide), (zinc oxide), (zinc peroxide), (zinc perchlorate) (zinc sulfate) (phase

  20. (45) 20080701 (11) 10-0842376

    Materials Science Websites

    Park, Byungwoo

    ), (zinc bromide), (zinc chloride), (zinc fluoride), (zinc carbonate), (zinc cyanide), (zinc nitrate+ ) . , . (dimethyl zinc), (diethyl zinc), (zinc acetylacetonate), (zinc iodide), (zinc oxide), (zinc peroxide), (zinc perchlorate) (zinc sulfate) (phase

  1. Characterization of a plasma membrane zinc transporter in rat brain

    Biology and Medicine Websites

    Characterization of a plasma membrane zinc transporter in rat brain Robert A. Colvin* Department; received in revised form 26 March 1998; accepted 31 March 1998 Abstract Many studies now show that zinc mechanisms of zinc efflux and influx are largely unknown and few models exist that describe cellular zinc

  2. A photonic crystal cavity-optical fiber tip nanoparticle sensor for biomedical applications

    CERN Preprints

    Shambat, Gary; Khurana, Aman; Provine, J; Sarmiento, Tomas; Cheng, Kai; Cheng, Zhen; Harris, James; Daldrup-Link, Heike; Gambhir, Sanjiv Sam; Vuckovic, Jelena

    2012-01-01

    We present a sensor capable of detecting solution-based nanoparticles using an optical fiber tip functionalized with a photonic crystal cavity. When sensor tips are retracted from a nanoparticle solution after being submerged, we find that a combination of convective fluid forces and optically-induced trapping cause an aggregation of nanoparticles to form directly on cavity surfaces. A simple readout of quantum dot photoluminescence coupled to the optical fiber shows that nanoparticle presence and concentration can be detected through modified cavity properties. Our sensor can detect both gold and iron oxide nanoparticles and can be utilized for molecular sensing applications in biomedicine.

  3. Performance Enhancement of a Graphene-Zinc Phosphide Solar Cell using the Electric Field-Effect

    Materials Science Websites

    Zettl, Alex

    1 Performance Enhancement of a Graphene-Zinc Phosphide Solar Cell using the Electric Field in Figure S1. We start with a Zn3P2 layer 7 m thick on top a Zn-doped GaAs substrate 500 m thick as shown in step 1 (from step 2 to 8 we only show the Zn3P2 and we omit the GaAs substrate). Then an oxide layer

  4. Reversible Repositioning of Zinc Atoms within Single Crystals of a Zinc Polycarboxylate with an Open-Framework Structure

    Materials Science Websites

    Reversible Repositioning of Zinc Atoms within Single Crystals of a Zinc Polycarboxylate compounds, we observed an unprecedented phenomenon. Upon heating under vacuum, the zinc compound not only loses water, but some of the zinc atoms move to different positions in the structure while preserving

  5. Scintillation properties of ceramics based on zinc oxide

    Nuclear Experiment (arXiv)

    V. A. Demidenko; E. I. Gorokhova; I. V. Khodyuk; O. A. Khristich; S. B. Mikhrin; P. A. Rodnyi

    2010-09-07

    Ceramics ZnO:Zn of 20mm diameter and 1.6mm thickness with an optical transparency up to 0.33 in the visible region have been prepared by hot pressing technique. Scintillating and luminescent characteristics such as emission spectra, decay time, yield, and TSL glow curve have been measured under X-ray excitation. Two emission bands peaking at 500 and 380 nm were detected, the light output was about 80% of that for standard BGO scintillator, main decay constant was 10.4 +/- 0.1 ns. The obtained data allow us to consider the ZnO:Zn ceramics as a perspective scintillator. Finally, the investigation shows that other ZnO-based fast scintillators can be fabricated in the form of optical ceramics.

  6. Piezoelectric Nanogenerators Based on Zinc Oxide Nanowire Arrays

    Materials Science Websites

    Wang, Zhong L.

    %. This approach has the potential of converting mechanical, vibrational, and/or hydraulic energy into electricity (glucose), and hydraulic en- ergy (body fluid and blood flow), but the challenge is their efficient

  7. SYNTHESIS OF ZINC OXIDE NANOWIRES Luthfia Syarbaini, St. John's University

    Materials Science Websites

    Petta, Jason

    Growth and System Preparation of Growth Chips Analysis ZnO Nanowire Systems Vacuum System Open System Vacuum System with oxygen Future Directions #12;Nanotechnology top-down approach bottom-up approach Chips. 2-4 nm of Au evaporated on growth substrates. Sharon Vacuum Evaporator. Au #12;GROWTH SYSTEM pump

  8. Scintillation properties of ceramics based on zinc oxide

    CERN Preprints

    Demidenko, V A; Khodyuk, I V; Khristich, O A; Mikhrin, S B; Rodnyi, P A

    2010-01-01

    Ceramics ZnO:Zn of 20mm diameter and 1.6mm thickness with an optical transparency up to 0.33 in the visible region have been prepared by hot pressing technique. Scintillating and luminescent characteristics such as emission spectra, decay time, yield, and TSL glow curve have been measured under X-ray excitation. Two emission bands peaking at 500 and 380 nm were detected, the light output was about 80% of that for standard BGO scintillator, main decay constant was 10.4 ± 0.1 ns. The obtained data allow us to consider the ZnO:Zn ceramics as a perspective scintillator. Finally, the investigation shows that other ZnO-based fast scintillators can be fabricated in the form of optical ceramics.

  9. Properties and sensor performance of zinc oxide thin films

    MIT - DSpace

    Min, Yongki, 1965-

    2003-01-01

    Reactively sputtered ZnO thin film gas sensors were fabricated onto Si wafers. The atmosphere dependent electrical response of the ZnO micro arrays was examined. The effects of processing conditions on the properties and ...

  10. Infrared and Raman spectroscopy of ZnO nanoparticles annealed in W. M. Hlaing Oo and M. D. McCluskeya

    Physics Websites

    McCluskey, Matthew

    and Raman spectroscopy complemented the IR experi- ments. Zinc oxide ZnO 5,6 is a wide band gap in previous experiments.14,15 The nano- particles were produced by the reaction of zinc acetate dihy- drate Zn

  11. Malarial Parasites Accumulate Labile Zinc Pools

    MIT - DSpace

    Niles, Jacquin

    The malarial parasite, Plasmodium falciparum, is an intracellular pathogen and partially dependent on nutrient uptake for survival. In this issue of Chemistry & Biology, Marvin et al. demonstrate that zinc is essential for ...

  12. Integrity of 111 In-radiolabeled superparamagnetic iron oxide

    Materials Science Websites

    Sridhar, Srinivas

    Integrity of 111 In-radiolabeled superparamagnetic iron oxide nanoparticles in the mouse Haotian. Gatley a, a Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115 b imaging (MRI), while radiolabeling the same platform with nuclear medicine isotopes allows imaging

  13. IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL. 16, NO. 3, MAY/JUNE 2010 691 Dynamics of Magnetic Nanoparticle-Based Contrast

    Biology and Medicine Websites

    Boppart, Stephen

    of Magnetic Nanoparticle-Based Contrast Agents in Tissues Tracked Using Magnetomotive Optical Coherence assessment of magnetic nanoparticles in tissues. In this study, we demonstrate the use of MM-OCT for quantitative measurement of magnetic iron oxide nanoparticle transport and concentration in ex vivo muscle

  14. The characterization of Co-nanoparticles supported on graphene

    CERN Preprints

    Bazylewski, P; Kukharenko, A I; Kurmaev, E Z; Hunt, A; Moewes, A; Lee, Y H; Cholakh, S O; Chang, G S

    2015-01-01

    The results of density functional theory calculations and measurements using X-ray photoelectron spectroscopy of Co-nanoparticles dispersed on graphene/Cu are presented. It is found that for low cobalt thickness (0.02 nm - 0.06 nm) the Co forms islands distributed non-homogeneously which are strongly oxidized under exposure to air to form cobalt oxides. At greater thicknesses up to 2 nm the upper Co-layers are similarly oxidized whereas the lower layers contacting the graphene remain metallic. The measurements indicate a Co2+ oxidation state with no evidence of a 3+ state appearing at any Co thickness, consistent with CoO and Co[OH]2. The results show that thicker Co (2nm) coverage induces the formation of a protective oxide layer while providing the magnetic properties of Co nanoparticles.

  15. High-efficiency visible photoluminescence from amorphous silicon nanoparticles embedded in silicon nitride

    Materials Science Websites

    Zexian, Cao

    High-efficiency visible photoluminescence from amorphous silicon nanoparticles embedded in silicon 29 August 2003 Confinement of silicon nanoparticles in silicon nitride instead of an oxide matrix. We report in this letter the production of high-density up to 4.0 1012 /cm2 from micrographs silicon

  16. Environmental Chemistry DIFFERENTIAL SENSITIVITY OF NITRIFYING BACTERIA TO SILVER NANOPARTICLES IN

    Environmental Management and Restoration Websites

    Alvarez, Pedro J.

    Environmental Chemistry DIFFERENTIAL SENSITIVITY OF NITRIFYING BACTERIA TO SILVER NANOPARTICLES, activity, and diversity of different nitrifying bacteria in wastewater treatment plants (WWTPs), however) and Agþ ions on the nitrifier community in activated sludge, including both ammonia-oxidizing bacteria

  17. Magnetic nanoparticles : synthesis, characterization, applications and systematic study of exchanging biasing

    MIT - DSpace

    Tracy, Joseph B. (Joseph Benjamin)

    2005-01-01

    We systematically investigated the magnetic properties of colloidal cobalt nanoparticles after three extents of oxidation: The native sample has a thin (1.0 nm) CoO shell and exhibits no exchange biasing. The purposefully ...

  18. Scaling of transverse nuclear magnetic relaxation due to magnetic nanoparticle aggregation

    MIT - DSpace

    Brown, Keith A.

    The aggregation of superparamagnetic iron oxide (SPIO) nanoparticles decreases the transverse nuclear magnetic resonance (NMR) relaxation time T[CP over 2] of adjacent water molecules measured by a Carr-Purcell-Meiboom-Gill ...

  19. Published: April 12, 2011 r 2011 American Chemical Society 8573 dx.doi.org/10.1021/jp106144p |J. Phys. Chem. C 2011, 115, 85738579

    Materials Science Websites

    Goddard III, William A.

    Transfer Reactivity at the Zinc OxideÀWater Interface David Raymand, Adri C.T. van Duin, William A. Goddard. INTRODUCTION Zinc oxide is used in nanoparticle applications, for instance in mesoporous metal oxide electrodes titration, Blok and de Bruyn8 proposed that the ZnO surface in contact with water may be regarded as zinc

  20. Carbon States in Carbon-Encapsulated Nickel Nanoparticles Studied by Means of X-Ray Absorption, Emission, and Photoelectron Spectroscopies

    CERN Preprints

    Galakhov, V R; Neumann, M; Ovechkina, N A; Shkvarin, A S; Semenova, A S; Uimin, M A; Yermakov, A Ye; Kurmaev, E Z; Vilkov, O Y; Boukhvalov, D W

    2011-01-01

    Electronic structure of nickel nanoparticles encapsulated in carbon was characterized by photoelectron, X-ray absorption, and X-ray emission spectroscopies. Experimental spectra are compared with the density of states calculated in the frame of the density functional theory. The carbon shell of Ni nanoparticles has been found to be multilayer graphene with significant (about 6%) amount of Stone--Wales defects. Results of the experiments evidence protection of the metallic nanoparticles from the environmental degradation by providing a barrier against oxidation at least for two years. Exposure in air for 2 years leads to oxidation only of the carbon shell of Ni@C nanoparticles with coverage of functional groups.

  1. Dispenser Printed Zinc Microbattery with an Ionic Liquid Gel Electrolyte

    University of California eScholarship Repository

    Ho, Christine Chihfan

    2010-01-01

    To activate the batteries, drops of alkaline electrolytein lithium batteries and water in some alkaline systems.alkaline zinc-based battery chemistries from providing extended cycle-life, and for the most part, zinc-based batteries

  2. Targeted sensors for investigating mobile Zinc in biology

    MIT - DSpace

    Chyan, Wen, S.B. Massachusetts Institute of Technology

    2013-01-01

    Chapter 1. Sensing Strategies for Detection of Mobile Zinc. Mobile zinc plays important physiological roles in areas such as the hippocampus, prostate, and pancreas. A better understanding of the distribution of intracellular ...

  3. Regulation of Zinc Transport in the Choroid Plexus 

    Texas A&M University - TxSpace

    Aquino, Mayra

    2014-07-21

    homeostasis by releasing the mineral during decreased availability (9, 16, 28). This is important in managing the intracellular zinc load and maintaining zinc homeostasis in order to avoid intracellular toxicity or deficiency of this essential nutrient...

  4. INSTRUCTIONS GelCode E-ZincTM

    Biology and Medicine Websites

    Lebendiker, Mario

    INSTRUCTIONS 079724582 GelCode® E-ZincTM Reversible Stain Kit 3747 N. Meridian Road P.O. Box 117-842-5007 Internet: http://www.piercenet.com 1 Product Description Number Description 24582 GelCode® E-ZincTM Reversible Stain Kit, 500 ml GelCode® E-ZincTM Developer, 500 ml GelCode® E-ZincTM Eraser, 500 ml Store

  5. Cellular/Molecular Intracellular Zinc Elevation Measured with a "Calcium-

    Biology and Medicine Websites

    Li, Yang V.

    Cellular/Molecular Intracellular Zinc Elevation Measured with a "Calcium- Specific" Indicator )asasecondmessengercomesfromitsinteractionwithfluorescent probes; however, many Ca2 probes also have a higher affinity for another divalent cation: zinc (Zn attributed to Ca2 could, in part, be attributable to Zn2 . Key words: zinc; calcium; fluorescence; ischemia

  6. PHOTOLUMINESCENCE STUDY OF CADMIUM ZINC TELLURIDE Thesis submitted to the

    Physics Websites

    Myers, Tom

    PHOTOLUMINESCENCE STUDY OF CADMIUM ZINC TELLURIDE Swati Jain Thesis submitted to the Eberly CollegeZnTe, CZT, Cd1-xZnxTe #12;ABSTRACT PHOTOLUMINESCENCE STUDY OF CADMIUM ZINC TELLURIDE SWATI JAIN point defects in bulk CdZnTe (CZT) crystals, 2) determining the zinc concentration in these crystals

  7. Supplemental Data S1 Weckle Is a Zinc Finger Adaptor

    Biology and Medicine Websites

    Perrimon, Norbert

    Supplemental Data S1 Weckle Is a Zinc Finger Adaptor of the Toll Pathway in Dorsoventral Patterning standard protocol (BDGP). #12;Figure S1. wek Encodes a Zinc Finger-Containing Protein (A) Schematic 273­470) with six zinc finger motifs. (C) Alignment of N domain. The consensus sequence of N domain

  8. Three-dimensionalimage oftubulinin zinc-inducedsheets, reconstructed

    Biology and Medicine Websites

    Baker, Timothy S.

    Three-dimensionalimage oftubulinin zinc-inducedsheets, reconstructed fromelectronmicrographs large arrays of tubulin protofilaments assemble when zinc ions are added to buffers normally used for microtubule reassembly'.`. The projected structure of the zinc-induced sheets in 0141 x130, 79 040146 11

  9. Geology Club Field Trip New Jersey Zinc Mine and Vicinity

    Geosciences Websites

    Merguerian, Charles

    Geology Club Field Trip New Jersey Zinc Mine and Vicinity Ogdensburg, NJ 3-4 May 2008 Bedrock map of the area surrounding the New Jersey Zinc Mine in Ogdensburg, New Jersey. The mines are found and revel in the history and beauty of America's unique zinc mines and minerals." Jones neglects to add how

  10. ZINC-DEPENDENT POTASSIUM CHANNEL MODULATION MEDIATES NEURONAL APOPTOSIS

    Biology and Medicine Websites

    Sibille, Etienne

    ZINC-DEPENDENT POTASSIUM CHANNEL MODULATION MEDIATES NEURONAL APOPTOSIS By Patrick Timothy Redman B of Biological Department of Neurobiology Sciences Major Advisor Outside Examiner #12;iii ZINC of Pittsburgh, 2008 Advisor: Elias Aizenman, Ph.D. The liberation of zinc from intracellular stores during

  11. ZINC SIGNALING IN NEURONAL TOLERANCE Mandar Anil Aras

    Biology and Medicine Websites

    Sibille, Etienne

    ZINC SIGNALING IN NEURONAL TOLERANCE by Mandar Anil Aras B.S. Neuroscience and Economics Aizenman, Professor, Department of Neurobiology ii #12;Copyright © by Mandar Anil Aras 2009 iii #12;ZINC.3 EXCITOTOXICITY MODELS ISCHEMIC NEURONAL DEATH ............ 3 1.4 ROLE OF ZINC IN ISCHEMIC NEURONAL DEATH

  12. Using Zinc to Reduce Cadmium in Durum Grain Joyce Eckhoff

    Environmental Sciences and Ecology Websites

    Lawrence, Rick L.

    Using Zinc to Reduce Cadmium in Durum Grain Joyce Eckhoff MSU Eastern Agricultural Research Center in Saskatchewan, zinc (Zn) applied to soil prior to planting significantly reduced Cd in durum grain, while Zn). Zinc applied with the seed had no effect on grain Cd or Zn content. Chelated Zn applied foliarly

  13. Reactive self-heating model of aluminum spherical nanoparticles

    CERN Preprints

    Martirosyan, Karen S

    2012-01-01

    Aluminum-oxygen reaction is important in many highly energetic, high pressure generating systems. Recent experiments with nanostructured thermites suggest that oxidation of aluminum nanoparticles occurs in a few microseconds. Such rapid reaction cannot be explained by a conventional diffusion-based mechanism. We present a rapid oxidation model of a spherical aluminum nanoparticle, using Cabrera-Mott moving boundary mechanism, and taking self-heating into account. In our model, electric potential solves the nonlinear Poisson equation. In contrast with the Coulomb potential, a "double-layer" type solution for the potential and self-heating leads to enhanced oxidation rates. At maximal reaction temperature of 2000 C, our model predicts overall oxidation time scale in microseconds range, in agreement with experimental evidence.

  14. Reactive self-heating model of aluminum spherical nanoparticles

    Mathematical Physics (arXiv)

    Karen S. Martirosyan; Maxim Zyskin

    2012-12-17

    Aluminum-oxygen reaction is important in many highly energetic, high pressure generating systems. Recent experiments with nanostructured thermites suggest that oxidation of aluminum nanoparticles occurs in a few microseconds. Such rapid reaction cannot be explained by a conventional diffusion-based mechanism. We present a rapid oxidation model of a spherical aluminum nanoparticle, using Cabrera-Mott moving boundary mechanism, and taking self-heating into account. In our model, electric potential solves the nonlinear Poisson equation. In contrast with the Coulomb potential, a "double-layer" type solution for the potential and self-heating leads to enhanced oxidation rates. At maximal reaction temperature of 2000 C, our model predicts overall oxidation time scale in microseconds range, in agreement with experimental evidence.

  15. Synthesis of zinc and cadmium O-alkyl thiocarbonate and dithiocarbonate complexes and a cationic zinc hydrosulfide complex

    Chemistry Websites

    Gherman, Benjamin F.

    Synthesis of zinc and cadmium O-alkyl thiocarbonate and dithiocarbonate complexes and a cationic zinc hydrosulfide complex Nicholas G. Spiropulos a , Eric A. Standley a , Ian R. Shaw a , Benjamin L Accepted 20 January 2012 Available online 9 February 2012 Keywords: Heterocumulenes Zinc Cadmium

  16. Strong photoluminescence of nanostructured crystalline tungsten oxide thin films

    Materials Science Websites

    Gao, Hongjun

    Strong photoluminescence of nanostructured crystalline tungsten oxide thin films M. Feng, A. L. Pan is observed in nanostructured crystalline tungsten oxide thin films that are prepared by thermal evaporation. Two kinds of films are investigated--one made of nanoparticles and another of nanowires. At room

  17. Formation and applications of nanoparticles in silica optical fibers

    CERN Preprints

    Blanc, Wilfried

    2015-01-01

    Optical fibers are the basis for applications that have grown considerably in recent years (telecommunications, sensors, fiber lasers, etc). Despite undeniable successes, it is necessary to develop new generations of amplifying optical fibers that will overcome some limitations typical of silica glass. In this sense, the amplifying Transparent Glass Ceramics (TGC), and particularly the fibers based on this technology, open new perspectives that combine the mechanical and chemical properties of a glass host with the augmented spectroscopic properties of embedded nanoparticles. This paper is an opportunity to make a state of the art on silica-based optical fibers containing nanoparticles of various types, particularly rare-earth-doped oxide nanoparticles, and on the methods for making such fibers. In the first section of this article, we will review basics on standard optical fibers and on nanoparticle-doped fibers. In the second section we will recall some fabrication methods used for standard optical fibers, ...

  18. Defect-induced magnetism and transport phenomena in epitaxial oxides

    University of Cambridge - Dspace

    Schoofs, Frank

    2012-07-03

    that the transition metal dopants (i.e. Mn) have no influence on the ferromagnetic nature of the zinc oxide, but that localised magnetic moments on intrinsic defects are in fact responsible for the ferromagnetic behaviour. A relation between strain (related to defect...

  19. Half-metallic Zinc-blende Compounds

    CERN Preprints

    Mavropoulos, P; Dederichs, P H; Mavropoulos, Ph.

    2003-01-01

    We report first-principles calculations of zinc-blende half-metals, identifying systems for epitaxial growth with semiconductors, and present calculations for CrAs/GaAs multilayers. We find that half-metallicity is conserved troughout the heterostructure, making this a good candidate for spintronics applications.

  20. Can hematite nanoparticles be an environmental Haibo Guo,a

    Geosciences Websites

    Johnson, Clark M.

    Can hematite nanoparticles be an environmental indicator? Haibo Guo,a Huifang Xub and Amanda S. Barnard*c Environmental indicators play an important role in assessing the state of the environment and understanding the trend of environmental changes. Iron oxide nanostructures are widespread in multiple

  1. Modeling of Magnetic Nanoparticles Transport in Shale Reservoirs 

    Texas A&M University - TxSpace

    An, Cheng

    2014-12-18

    with the aqueous phase into the fractures, but their transport into the shale matrix is quite limited, with little transport shown into the organic matter. In addition, based on the magnetic properties of synthesized magnetic carbon-coated iron-oxide nanoparticles...

  2. GROUP MEMBERS: 1. Ms. Shital Kahane

    Materials Science Websites

    Dharmadhikari, C. V.

    of Zinc Selenide Based Quantum Dots Ph.D. awarded to Amit D. Lad (Jan. 2009). (9) Synthesis and Study Zinc Oxide Nanoparticles M.Phil awarded to Pratibha Kadam (October 2008). (7) Optical Properties of Pune (August 2005) (5) Photophysics of Zinc Sulphide and Zinc Selenide based Quantum Structures Ph

  3. Identification of Functional Surfaces of the Zinc Binding Domains of Intracellular Receptors

    Biotechnology Websites

    Lichtarge, Olivier

    Identification of Functional Surfaces of the Zinc Binding Domains of Intracellular Receptors. To gain insights on the sur- faces that determine this assembly in the zinc binding domains from zinc ions (zinc ®nger type II). These IR zinc bind- ing domains (ZBDs) can by themselves dimerize

  4. Phase Relationships and Physical Properties of Homologous Compounds in the Zinc OxideIndium Oxide System

    Chemistry Websites

    Poeppelmeier, Kenneth R.

    of properties important for TCO applications. ZnO and In2O3 react at high temperatures (>1000°C) to form Equilibrium phase relationships in the ZnO­In2O3 system were determined between 1100° and 1400°C using solid- state reaction techniques and X-ray diffractometry. In ad- dition to ZnO and In2O3, nine homologous

  5. Effects of Dye Loading Conditions on the Energy Conversion Efficiency of ZnO and TiO2 Dye-Sensitized Solar Cells

    Materials Science Websites

    Cao, Guozhong

    light conversion efficiency of zinc oxide (ZnO) film electrodes in dye-sensitized solar cells dye concentration, where the nanoparticle structure was not affected. Introduction Zinc oxide (Zn deposition (MOCVD) from zinc acetylacetonate hydrate vapor and oxygen gas. They also used a seeding method

  6. In-situ environmental transmission electron microscopy (ETEM) is a powerful tool for following the evolution of supported metal nanoparticles under different reacting gas conditions at elevated temperatures. The ability to

    Computer Technologies and Information Sciences Websites

    the evolution of supported metal nanoparticles under different reacting gas conditions at elevated temperatures gas atmospheres that exist in the ex-situ reactor. During ramp-up in CH4 and O2, the metal nanoparticles undergo oxidation and the oxidation behaviors are quite different for Ni and Ru. Ni metal

  7. Hydrogen Oxidation and Evolution Reaction Kinetics on Platinum: Acid vs Alkaline Electrolytes

    MIT - DSpace

    Sheng, Wenchao

    The kinetics of the hydrogen oxidation reaction (HOR) and hydrogen evolution reaction (HER) on polycrystalline platinum [Pt(pc)] and high surface area carbon-supported platinum nanoparticles (Pt/C) were studied in 0.1 M ...

  8. Fluorescent chemosensors for exploring zinc metalloneurochemistry and detecting mercury in aqueous solution

    MIT - DSpace

    Nolan, Elizabeth M. (Elizabeth Marie), 1978-

    2006-01-01

    Chapter 1. An Introduction to Zinc Metalloneurochemistry and Zinc Detection in Biology. This chapter presents an overview of zinc neurophysiology and pathology, which provides motivation for the design of new tools and ...

  9. Nontoxic and Abundant Copper Zinc Tin Sulfide Nanocrystals for Potential High-Temperature Thermoelectric Energy Harvesting

    Physics Websites

    Chen, Yong P.

    Nontoxic and Abundant Copper Zinc Tin Sulfide Nanocrystals for Potential High and abundant copper zinc tin sulfide (CZTS) nanocrystals for potential thermoelectric applications. The CZTS a significant improvement in the performance. KEYWORDS: Thermoelectric, copper zinc tin sulfide, nanocrystal

  10. Commercial Pecans: Controlling Rosette, Diseases and Zinc Deficiency 

    Texas A&M University - TxSpace

    Lee, Thomas A.; Krausz, Joseph P.

    2006-04-13

    Pecan losses from diseases and insufficient zinc nutrition can be prevented by following effective grove management practices. Descriptions of diseases and recommendations for controls are included....

  11. Dispenser Printed Zinc Microbattery with an Ionic Liquid Gel Electrolyte

    University of California eScholarship Repository

    Ho, Christine Chihfan

    2010-01-01

    electrochemical properties. The zinc salt and ionic liquidsalts at room temperatures with interesting properties suchsalt concentration in BMIM + Tf - exhibited desirable electrochemical and physical properties and

  12. Photoemission from metal nanoparticles

    CERN Preprints

    Protsenko, Igor E

    2012-01-01

    A.Brodsky and Yu.Gurevitch approach is discussed and generalized for photoemission from metal nano-particles taking into account the excitation of localized plasmon resonance (LPR) and changes of electromagnetic field (EMF) and conduction electron mass in the metal - environment interface. New result is the increase of photo-emission current several time respectively to the case of continues metal film due to increase of intensity of EMF near the surface of nanoparticles and also due to surface phenomena mentioned above. Results can be applied for development new photodetectors, photo energy converters (solar cells) and for more studies of photoemission from metal nanoparticles.

  13. Divalent metal nanoparticles

    MIT - DSpace

    DeVries, Gretchen Anne

    2008-01-01

    Metal nanoparticles hold promise for many scientific and technological applications, such as chemical and biological sensors, vehicles for drug delivery, and subdiffraction limit waveguides. To fabricate such devices, a ...

  14. Thermally Polymerized Rylene Nanoparticles

    MIT - DSpace

    Andrew, Trisha Lionel

    Rylene dyes functionalized with varying numbers of phenyl trifluorovinyl ether (TFVE) moieties were subjected to a thermal emulsion polymerization to yield shape-persistent, water-soluble chromophore nanoparticles. Perylene ...

  15. Electron Photoemission in Plasmonic Nanoparticle Arrays: Analysis of Collective Resonances and Embedding Effects

    CERN Preprints

    Zhukovsky, Sergei V; Uskov, Alexander V; Protsenko, Igor E; Lavrinenko, Andrei V

    2013-01-01

    We theoretically study the characteristics of photoelectron emission in plasmonic nanoparticle arrays. Nanoparticles are partially embedded in a semiconductor, forming Schottky barriers at metal/semiconductor interfaces through which photoelectrons can tunnel from the nanoparticle into the semiconductor; photodetection in the infrared range, where photon energies are below the semiconductor band gap (insufficient for band-to-band absorption in semiconductor), is therefore possible. The nanoparticles are arranged in a sparse rectangular lattice so that the wavelength of the lattice-induced Rayleigh anomalies can overlap the wavelength of the localized surface plasmon resonance of the individual particles, bringing about collective effects from the nanoparticle array. Using full-wave numerical simulations, we analyze the effects of lattice constant, embedding depth, and refractive index step between the semiconductor layer and an adjacent transparent conductive oxide layer. We show that the presence of refracti...

  16. A low temperature amorphous oxide thin film transistor (TFT) backplane technology for flexible organic light emitting diode (OLED) displays has been developed to create 4.1-in. diagonal backplanes. The critical steps in

    Computer Technologies and Information Sciences Websites

    of the low temperature (200°C) metal oxide process, the stability of the devices under forward and reverse 200 ºC on a polyethylene naphthalate (PEN) substrate using mixed metal oxides of either zinc indium performance and stability is strongly dependent upon the composition of the mixed metal oxide; this dependency

  17. REGULAR ARTICLE Grain zinc, iron and protein concentrations

    Computer Technologies and Information Sciences Websites

    Yanikoglu, Berrin

    REGULAR ARTICLE Grain zinc, iron and protein concentrations and zinc-efficiency in wild emmer wheat half of the world's cereal-growing area is affected by soil Zn deficiency. Wild emmer wheat [Triticum concentrations. Twenty two wild emmer wheat accessions, representing a wide range of drought resistance capacity

  18. SYNTHESIS OF NANOSIZED ZINC FERRITES IN RF THERMAL PLASMA REACTOR

    Materials Science Websites

    Gubicza, Jenõ

    magnetization. Nanosized zinc ferrite particles having ferromagnetic properties were pro- duced which refers magnetization among spinel ferrites. Inverse zinc ferrite spinels of ultrafine particle size can be produced ethanol using a magnetic stirrer. The Fe to Zn molar ratio was set to 2:1 in all cases. In the tests

  19. Glutamine and zinc methionine supplementation to dairy calves 

    Texas A&M University - TxSpace

    Simon, Robin Renee

    1999-01-01

    Glutamine and zinc play an important role in immune functions of animals. The objective of this research was to determine the effects of L-glutamine or zinc methionine supplementation on 1) plasma concentrations of minerals in dairy calves, and 2...

  20. CO Oxidation at the Au-Cu Interface of Bimetallic Nanoclusters Supported on CeO2(111)

    Chemistry Websites

    Henkelman, Graeme

    nanoparticles (NPs)/nanoclusters (NCs) has been highlighted by many experimental and theoretical studies.1's pioneering finding on the excellent catalytic activity of oxide-supported Au NPs, the oxidation chemistry of oxide-supported Au NPs or NCs has been studied extensively, with a focus on a determination

  1. Oxidation of 9CrODS Exposed to Supercritical Water J. Bischoff and A.T. Motta

    Fission and Nuclear Technologies Websites

    Motta, Arthur T.

    the oxide microstructure changes with exposure time and those between the samples exposed to 500º strengthened steel, oxidation INTRODUCTION The Supercritical Water Reactor (SCWR) is one of the Generation IV dispersion strengthened steel containing yttrium-rich oxide nano-particles, and was initially developed

  2. Nanoparticle growth Controlled Growth of Platinum Nanoparticles on Strontium

    Chemistry Websites

    Poeppelmeier, Kenneth R.

    Nanoparticle growth Controlled Growth of Platinum Nanoparticles on Strontium Titanate Nanocubes, dispersion, and chemical state of the Pt nanoparticles are controlled by the number of ALD growth cycles and Engineering Northwestern University Evanston, IL 60208-3108 (USA) E-mail: bedzyk@northwestern.edu Dr. J. W

  3. Nanoparticle Interactions with Lipid Bilayers

    University of California eScholarship Repository

    Edwards, Shayson C.

    2015-01-01

    of protein cancer markers with biobarcoded nanoparticlenanoparticle is released 50 . Nanoparticles are also used for the application of proteinprotein sensing with nanopores—especially DNA sequencing, and artificial lipid bilayers have the potential be applied for use in nanoparticle

  4. Nanoparticles for Targeted Drug Delivery

    MIT - DSpace

    Chow, Gan-Moog

    Nanoparticles were synthesized and modified for target drug delivery. The research involved the aqueous synthesis of near infrared (NIR) sensitive Au-Au2S nanoparticles. An anti-cancer drug (cis-platin) ...

  5. Preparation and characterisation of mixed CeO2-Nb2O5-Bi2O3 nanoparticles

    University of Cambridge - Dspace

    Moore, Katharine

    2015-10-06

    and ternary oxides in the nano-form within the Bi2O3-CeO2-Nb2O5 system, including quantitative analysis of these particles. Secondly, and most importantly, it presents the first successful synthesis of quaternary oxide nanoparticles containing bismuth, cerium...

  6. Nanoparticle/Graphene Capsules by Capillary Molding K. Sohn1, Y. J. Na1, H. Chang2, K. Roh2, H. D. Jang2 and J. Huang1

    Engineering Websites

    Shahriar, Selim

    MRSEC Nanoparticle/Graphene Capsules by Capillary Molding K. Sohn1, Y. J. Na1, H. Chang2, K. Roh2 by capillary molding of graphene oxide (GO) sheets against polystyrene bead template in evaporating aerosol

  7. Protein Delivery Using Cys2-His2 Zinc-Finger Domains Thomas Gaj,,

    Biology and Medicine Websites

    Barbas III, Carlos F.

    Protein Delivery Using Cys2-His2 Zinc-Finger Domains Thomas Gaj,, * Jia Liu, Kimberly E. Anderson previously reported that zinc-finger nuclease proteins are intrinsically cell-permeable due to the cell-penetrating activity of the Cys2-His2 zinc-finger domain. Here, we demonstrate that genetically fused zinc- finger

  8. Zinc Detection in Serum by Anodic Stripping Voltammetry on Microfabricated Bismuth Electrodes

    Biology and Medicine Websites

    Papautsky, Ian

    Zinc Detection in Serum by Anodic Stripping Voltammetry on Microfabricated Bismuth Electrodes.papautsky@uc.edu Received: September 28, 2012 Accepted: November 1, 2012 Published online: January 22, 2013 Abstract Zinc electrochemical cell, Zinc in serum DOI: 10.1002/elan.201200530 1 Introduction Zinc (Zn) is an essential trace

  9. Prediction of structures of zinc-binding proteins through explicit modeling of

    Biotechnology Websites

    Baker, David

    Prediction of structures of zinc-binding proteins through explicit modeling of metal coordination an essential role in stabilizing protein structures and contributing to protein function. Ions such as zinc of zinc-binding proteins given knowledge of the positions of zinc-coordinating residues in the amino acid

  10. The Modelling Language Zinc Maria Garcia de la Banda, Kim Marriott, Reza Rafeh, and Mark Wallace

    Computer Technologies and Information Sciences Websites

    Garcia de la Banda, Maria

    The Modelling Language Zinc Maria Garcia de la Banda, Kim Marriott, Reza Rafeh, and Mark Wallace}@mail.csse.monash.edu.au Abstract. We describe the Zinc modelling language. Zinc provides set constraints, user defined types, constrained types, and polymorphic pred- icates and functions. The last allows Zinc to be readily extended

  11. Zinc-dependent Interaction between Dishevelled and the Drosophila Wnt Antagonist Naked Cuticle*

    Biotechnology Websites

    Scott, Matthew

    Zinc-dependent Interaction between Dishevelled and the Drosophila Wnt Antagonist Naked Cuticle of the chelating agent EDTA abolished the in vitro Nkd-Dsh interaction. Surprisingly zinc, but not calcium, was able to restore Nkd-Dsh binding, sug- gesting a zinc-mediated interaction. Calcium 45- and zinc 65

  12. Nonsulfide zinc deposits in the SilesiaCracow district, Southern Poland

    Geosciences Websites

    Boni, Maria

    ARTICLE Nonsulfide zinc deposits in the Silesia­Cracow district, Southern Poland Vito Coppola in Poland has been one of the world's principal sources of zinc from nonsulfide zinc ore (Polish: galman. Keywords Silesia­Cracow Poland . Nonsulfide zinc . Paleoweathering . Smithsonite . Stable isotopes

  13. Hybrid Zinc Phthalocyanine/Zinc Oxide System for Photovoltaic De-vices: a DFT and TDDFPT Theoretical Investigation

    Physics Websites

    Giannozzi, Paolo

    competitive with thin- film inorganic solar cells. However, large-scale applications still suffer of a low processes at the core of the solar cell functioning:1­3 (i) optical absorption induced by solar light, in the case of dye-sensitized solar cells (DSSC),2 the D - A system is rep- resented by a D organic dye

  14. Role of the nanoscale in catalytic CO oxidation by supported Au and Pt nanostructures Sergey N. Rashkeev,1,2,

    Materials Science Websites

    Pennycook, Steve

    Role of the nanoscale in catalytic CO oxidation by supported Au and Pt nanostructures Sergey N found that the catalytic activity of Au increases sharply for supported nanoparticles smaller than 5 nm in catalytically active TiO2-supported Au nanoparticles. DOI: 10.1103/PhysRevB.76.035438 PACS number s : 82.65. r I

  15. Facile and Scalable Preparation of Graphene Oxide-Based Magnetic Hybrids for Fast and Highly Efficient Removal of Organic Dyes

    MIT - DSpace

    Jiao, Tifeng

    This study reports the facile preparation and the dye removal efficiency of nanohybrids composed of graphene oxide (GO) and Fe[subscript 3]O[subscript 4] nanoparticles with various geometrical structures. In comparison to ...

  16. J. Mol. Biol. (1996) 260, 7084 A Zinc-binding Domain Involved in the Dimerization

    Biology and Medicine Websites

    1996-01-01

    J. Mol. Biol. (1996) 260, 70­84 A Zinc-binding Domain Involved in the Dimerization of RAG1 Karla K Whitney contains a C3HC4 zinc-binding motif (zinc ring finger) that binds two zinc Avenue, P.O. Box 208114 ions. We have found that RAG1 contains additional zinc-binding motifs in the form of two separate C2H2

  17. Galactic Chemical Evolution: Hydrogen Through Zinc

    Astrophysics (arXiv)

    by F. X. Timmes; S. E. Woosley; Thomas A. Weaver

    1994-11-01

    Using the output from a grid of 60 Type II supernova models (Woosley \\& Weaver 1994) of varying mass (11 $\\ltaprx$ M/M\\sun $\\ltaprx$ 40) and metallicity (0, 10$^{-4}$, 0.01, 0.1, and 1 Z\\sol), the chemical evolution of 76 stable isotopes, from hydrogen to zinc, is calculated. The chemical evolution calculation employs a simple dynamical model for the Galaxy (infall with a 4 billion year $e$-folding time scale onto a exponential disk and 1/r$^2$ bulge), and standard evolution parameters, such as a Salpeter initial mass function and a quadratic Schmidt star formation rate. The theoretical results are compared in detail with observed stellar abundances in stars with metallicities in the range -3.0 $\\ltaprx$ [Fe/H] $\\ltaprx$ 0.0 dex. While our discussion focuses on the solar neighborhood where there are the most observations, the supernovae rates, an intrinsically Galactic quantity, are also discussed.

  18. Characterization of hydrous ruthenium oxide/carbon nanocomposite supercapacitors prepared by a colloidal method

    Energy Storage, Conversion and Utilization Websites

    Popov, Branko N.

    that of activated carbon based electrochemical double layer capacitor [2]. However, the high material cost of RuO2Áx electro- chemical capacitor consisting of hydrous ruthenium oxide nanoparticles dispersed within for an electrochemical capacitor based on hydrous ruthenium oxide electrodes, which includes both double layer

  19. Anodic oxidation

    CERN Preprints

    Ross, Sidney D; Rudd, Eric J; Blomquist, Alfred T; Wasserman, Harry H

    2013-01-01

    Anodic Oxidation covers the application of the concept, principles, and methods of electrochemistry to organic reactions. This book is composed of two parts encompassing 12 chapters that consider the mechanism of anodic oxidation. Part I surveys the theory and methods of electrochemistry as applied to organic reactions. These parts also present the mathematical equations to describe the kinetics of electrode reactions using both polarographic and steady-state conditions. Part II examines the anodic oxidation of organic substrates by the functional group initially attacked. This part particular

  20. Production of zinc substituted hydroxyapatite using various precipitation routes

    University of Cambridge - Dspace

    Shepherd, David; Best, Serena Michelle

    2013-01-01

    to substitute biologically significant levels of zinc into the crystal structure through wet chemical routes, whilst retaining the high temperature phase stability required for processing. The aim of this study is to investigate two different precipitation...

  1. The effects of alcohol use on zinc status 

    Texas A&M University - TxSpace

    Chapman, Lisa Louise

    1998-01-01

    Alcohol consumption has been shown to have adverse affects on bone growth and maintenance, although the mechanism has not been elucidated. The objective of this research was to look at the relationship between zinc and alcohol as a possible...

  2. Nanoparticles for therapeutic and diagnostic applications

    University of California eScholarship Repository

    Chiu, Yin To

    2014-01-01

    Nanoparticle-based bio-bar codes for the ultrasensitive detection of proteins.nanoparticle decorated with antibodies specific to the proteinprotein pVIII (Abcam Inc. , Cambridge, MA) were added to the nanoparticle

  3. DOI: 10.1002/asia.201200897 Mono-PEGylated Zinc(II) Phthalocyanines: Preparation, Nanoparticle

    Chemistry Websites

    Wu, Chi

    Formation, and In Vitro Photodynamic Activity Baozhong Zhao, Wubiao Duan, Pui-Chi Lo, Lei Duan, Chi Wu, and Dennis K. P. Ng*[a] Photodynamic therapy (PDT) has emerged as a promising treatment modality for some-localizing photosensitizer which is activated with light of appropriate wavelength. The resulting photodynamic reactions lead

  4. Evaluation of monolayer protected metal nanoparticle technology

    MIT - DSpace

    Wu, Diana J

    2005-01-01

    Self assembling nanostructured nanoparticles represent a new class of synthesized materials with unique functionality. Such monolayer protected metal nanoparticles are capable of resisting protein adsorption, and if utilized ...

  5. Use of Superparamagnetic Nanoparticle/Block Copolymer Electrostatic Complexes as Contrast Agents in Magnetic Resonance Imaging

    Condensed Matter (arXiv)

    Jean-Francois Berret; Regis Cartier

    2007-01-26

    During the past years we have investigated the complexation between nanocolloids and oppositely charged polymers. The nanocolloids examined were ionic surfactant micelles and inorganic oxide nanoparticles. For the polymers, we used homopolyelectrolytes and block copolymers with linear and comb architectures. In general, the attractive interactions between oppositely charged species are strong and as such, the simple mixing of solutions containing dispersed constituents yield to a precipitation, or to a phase separation. We have developed means to control the electrostatically-driven attractions and to preserve the stability of the mixed solution. With these approaches, we designed novel core-shell nanostructures, e.g. as those obtained with polymers and iron oxide superparamagnetic nanoparticles. In this presentation, we show that electrostatic complexation can be used to tailor new functionalized nanoparticles and we provide examples related to biomedical applications in the domain of contrast agents for Magnetic Resonance Imaging.

  6. Coating thickness and coverage effects on the forces between silica nanoparticles in water

    Condensed Matter (arXiv)

    K. Michael Salerno; Ahmed E. Ismail; J. Matthew D. Lane; Gary S. Grest

    2014-05-20

    The structure and interactions of coated silica nanoparticles have been studied in water using molecular dynamics simulations. For 5 nm diameter amorphous silica nanoparticles we studied the effects of varying the chain length and grafting density of polyethylene oxide (PEO) on the nanoparticle coating's shape and on nanoparticle-nanoparticle effective forces. For short ligands of length $n=6$ and $n=20$ repeat units, the coatings are radially symmetric while for longer chains ($n=100$) the coatings are highly anisotropic. This anisotropy appears to be governed primarily by chain length, with coverage playing a secondary role. For the largest chain lengths considered, the strongly anisotropic shape makes fitting to a simple radial force model impossible. For shorter ligands, where the coatings are isotropic, we found that the force between pairs of nanoparticles is purely repulsive and can be fit to the form $(R/2r_\\text{core}-1)^{-b}$ where $R$ is the separation between the center of the nanoparticles, $r_\\text{core}$ is the radius of the silica core, and $b$ is measured to be between 2.3 and 4.1.

  7. Characterization of Magnetic Nanoparticles Using Energy-Selected Transmission Electron Microscopy

    Materials Science Websites

    Dunin-Borkowski, Rafal E.

    Characterization of Magnetic Nanoparticles Using Energy-Selected Transmission Electron Microscopy in a high-resolution transmission electron microscope. The samples comprised Fe/FeOx and Co/CoOx nanoparti crystals coated in 5­10 nm of metal oxide layer and the Ni metallic crystallites embedded in an amorphous

  8. Nanoparticle Formation via Copper (II) Acetylacetonate Vapor Decomposition in the Presence of Hydrogen and Water

    Materials Science Websites

    on the experimental conditions and changes from copper to copper (I) oxide when the precursor vapor pressure is copper (II) acetylacetonate (Cu(acac)2) due to suitable equilibrium vapor pressure and low decompositionNanoparticle Formation via Copper (II) Acetylacetonate Vapor Decomposition in the Presence

  9. In-Situ Grown Erbium-Doped Dielectric Nanoparticles in Silica-Based Transparent Optical Fibers

    CERN Preprints

    Dussardier, Bernard; Mauroy, Valérie; Ude, Michèle; Trzesien, Stanislaw; Mady, Franck; Benabdesselam, Mourad; Monnom, Gérard

    2011-01-01

    An efficient method to fabricate transparent glass ceramic fibers containing in-situ grown Er3+-doped oxide nanoparticles is presented. Characterization of the drawn fibers exhibits low loss (0.4 dB/m) and broadened Er3+ emission spectrum. This attractive method offers new scopes for fiber amplifiers.

  10. Tailoring the biodegradability of porous silicon nanoparticles Nick K. Hon,1

    Engineering Websites

    Jalali. Bahram

    .1002/jbm.a.34294 Abstract: Porous silicon nanoparticles (PSiNPs) are attractive carriers for targeted drug delivery in nanomedicine. For in vivo applications, the biodegradation property of PSiNPs pro- vides the effect of both thermal oxidation and silica coating on the stability of PSiNPs in phosphate buffered

  11. Preparation of BaTiO3 nanoparticles by combustion spray pyrolysis Sangjin Leea

    Materials Science Websites

    Messing, Gary L.

    Preparation of BaTiO3 nanoparticles by combustion spray pyrolysis Sangjin Leea , Taehwan Sona were synthesized by combustion spray pyrolysis using a 1:1 molar ratio of oxidizer and fuel. To prepare. Keywords: BaTiO3; Nanomaterials; Spray pyrolysis; Combustion; Powder technology 1. Introduction Fine barium

  12. Laser-driven synthesis and magnetic properties of iron nanoparticles Yuanqing He1,4

    Materials Science Websites

    Swihart, Mark T.

    and characterization of iron nanoparticles formed by laser-driven pyrolysis of iron carbonyl (Fe(CO)5) vapors. CO2 laser pyrolysis of different CVD precursors has proven to be a successful method for prepara- tion et al., 2003b). Laser-driven pyrolysis of gaseous precursors for preparation of iron and iron oxide

  13. Further Evidences for Spin Glass like behavior in NiO nanoparticles

    Condensed Matter (arXiv)

    S. D. Tiwari; K. P. Rajeev

    2004-08-26

    Nickel oxide nanoparticles are prepared by a sol gel method and characterized by x-ray diffraction and transmission electron microscope. Here we present measurements on temperature and field dependence of magnetization and time dependence of thermoremanent magnetization. Our conclusion based on these measurements is that the system shows spin glass like behavior.

  14. A Robust Microporous Zinc Porphyrin Framework Solid Dennis W. Smithenry, Scott R. Wilson, and Kenneth S. Suslick*

    Materials Science Websites

    Suslick, Kenneth S.

    A Robust Microporous Zinc Porphyrin Framework Solid Dennis W. Smithenry, Scott R. Wilson. Mathews AVenue, Urbana, Illinois 61801 Received July 24, 2003 A robust microporous zinc crystal data has an interpenetrated three-dimensional framework of zinc trans

  15. Reflection of nanoparticles

    Nonlinear Sciences (arXiv)

    M. A. Ratner; A. V. Tur; V. V. Yanovsky

    2013-12-18

    This work is devoted to molecular dynamics modeling of collision of nanoparticle having a small number of degrees of freedom with a structureless plain. The new regularities are established that determine properties of such particles. Generalized collision law is obtained where particle properties are determined by two coefficient, on of which corresponds to restitution coefficient. The discovered regularity predicts the existence of anomalous mode of particle reflection from a massive plain. In this mode, velocity of nanoparticle after reflection from a plain can exceed the initial one. The criterion of realization of such mode is obtained. Anomalous collision mode was observed during numerical modeling. Physical mechanism are discussed of phenomena that are observed during numerical experiments.

  16. Metallic nanoparticles meet Metadynamics

    CERN Preprints

    Pavan, Luca; Baletto, Francesca

    2015-01-01

    We show how standard Metadynamics coupled with classical Molecular Dynamics can be successfully ap- plied to sample the configurational and free energy space of metallic and bimetallic nanopclusters via the implementation of collective variables related to the pair distance distribution function of the nanoparticle itself. As paradigmatic examples we show an application of our methodology to Ag147, Pt147 and their alloy AgshellPtcore at 1:1 and 2:1 chemical compositions. The proposed scheme is not only able to reproduce known structural transformation pathways, as the five and the six square-diamond mechanisms both in pure and core-shell nanoparticles but also to predict a new route connecting icosahedron to anti-cuboctahedron.

  17. Formation of Novel Polymeric Nanoparticles

    Chemistry Websites

    Wu, Chi

    occupied per stabilizer (surfactant, polymer chains, and ionic groups) is close to a constant. Introduction, to stabilize nanoparticles, especially in the food and pharmaceutical industries. Polymeric nanoparticles modification, and by hydrophilic polymer chains grafted or adsorbed on the particle surface, which

  18. Asphalt Oxidation Kinetics and Pavement Oxidation Modeling 

    Texas A&M University - TxSpace

    Jin, Xin

    2012-07-16

    oxidation model that predicts asphalt oxidation and hardening in pavement under environmental conditions. A number of asphalts were studied in laboratory condition. Based on kinetics data, a fast-rate ? constant-rate asphalt oxidation kinetics model...

  19. Ratiometric and intensity-based zinc sensors built on rhodol and rhodamine platforms

    MIT - DSpace

    Tomat, Elisa

    A xanthene-forming condensation reaction yields rhodol and rhodamine dyes carrying a zinc-binding ligand that includes the aniline-type nitrogen donor of the fluorophores. Upon zinc coordination in neutral aqueous solution, ...

  20. Flexographically Printed Rechargeable Zinc-based Battery for Grid Energy Storage

    University of California eScholarship Repository

    Wang, Zuoqian

    2013-01-01

    zinc-based batteries represent a promising technology for grid energy storageZinc-based solid-state batteries can be fabricated using traditional flexographic printing technique for high throughput, cost effective energy storage

  1. INTRODUCTION Members of the spalt (sal) gene family encode zinc-finger

    Biology and Medicine Websites

    Emmons, Scott

    INTRODUCTION Members of the spalt (sal) gene family encode zinc-finger proteins that both control Members of the spalt (sal) gene family encode zinc-finger proteins that are putative tumor suppressors

  2. The Zinc Finger Protein Schnurri Acts as a Smad Partner in Mediating the Transcriptional

    Biology and Medicine Websites

    Warrior, Rahul

    The Zinc Finger Protein Schnurri Acts as a Smad Partner in Mediating the Transcriptional Response and regulate the transcription of Dpp-responsive genes. Genetic analysis has implicated Schnurri (Shn), a zinc

  3. Optical response of a silicon nanowire FET conjugated with zinc octaethylporphyrin molecules

    Engineering Websites

    Hwang, Sung Woo

    #12;Optical response of a silicon nanowire FET conjugated with zinc octaethylporphyrin molecules DNW field-effect-transistor (FET) conjugated with Zn-OEP (Zinc octaethylporphyrin) molecules. 2. EXPERIMENT

  4. Modeling Zinc and Sodium Chloride Migration in Vadose Zone Soils Beneath Stormwater Infiltration Devices

    Environmental Sciences and Ecology Websites

    Clark, Shirley E.

    Modeling Zinc and Sodium Chloride Migration in Vadose Zone Soils Beneath Stormwater Infiltration influence on the movement of zinc, sodium, and chloride in the vadose zone beneath a typical infiltration

  5. Erratum: Unexpected failure rates for modular assembly of engineered zinc fingers

    Chemistry Websites

    Cai, Long

    Erratum: Unexpected failure rates for modular assembly of engineered zinc fingers Cherie L Ramirez be associated with the third column (96 sites). The weblink for the Zinc Finger Consortium website was incorrect

  6. The Zinc Finger Protein DIE-1 Is Required for Late Events during Epithelial Cell

    Biology and Medicine Websites

    Hardin, Jeff

    The Zinc Finger Protein DIE-1 Is Required for Late Events during Epithelial Cell Rearrangement in C a necessary prerequisite for elongation. The die-1 gene encodes a C2H2 zinc finger protein containing four

  7. Zinc released from olfactory bulb glomeruli by patterned electrical stimulation of the olfactory nerve

    MIT - DSpace

    Blakemore, Laura J.

    Zinc is a trace element with a multitude of roles in biological systems including structural and cofactor functions for proteins. Although most zinc in the central nervous system (CNS) is protein bound, the CNS contains a ...

  8. invertebrates and the interaction ofcadmium and zinc on the freshwater shrimp, Parotya tasmaniensis Riek. Aust.

    Environmental Sciences and Ecology Websites

    invertebrates and the interaction ofcadmium and zinc on the freshwater shrimp, Parotya tasmaniensis invertebrate larvae in mercury, copper, and zinc solutions. Aust. J. Mar. Freshwater Res. 18:63-72. JUDITH S

  9. Synthesis and Characterization of Bimagnetic Bricklike Nanoparticles

    Materials Science Websites

    Liu, J. Ping

    Bimagnetic FePt/CoFe2O4 nanoparticles having a bricklike morphology were synthesized by growing a soft magnetic CoFe2O4 phase on FePt cubic nanoparticle seeds. The size of the soft phase could be controlled nanoparticles having a novel morphology: bricklike nanoparticles, which consist of two components, FePt and Co

  10. Electronic Structure of Low-Temperature Solution-Processed Amorphous Metal Oxide Semiconductors for Thin-Film Transistor Applications

    University of Cambridge - Dspace

    Socratous, Josephine; Banger, Kulbinder K.; Vaynzof, Yana; Sadhanala, Aditya; Brown, Adam D.; Sepe, Alessandro; Steiner, Ullrich; Sirringhaus, Henning

    2015-02-18

    The electronic structure of low temperature, solution-processed indium–zinc oxide thin-film transistors is complex and remains insufficiently understood. As commonly observed, high device performance with mobility >1 cm2 V?1 s?1 is achievable after...

  11. A zinc finger protein array for the visual detection of specific DNA sequences for

    Materials Science Websites

    Revzin, Alexander

    , which contains about 30 amino acids (14). The Cys2-His2 zinc finger domain provides a versa- tile sequence (14,15). The amino acids of the zinc finger form a bba fold, which is stabilized by hydrophobicA zinc finger protein array for the visual detection of specific DNA sequences for diagnostic

  12. Structural and Room-Temperature Transport Properties of Zinc Blende and Wurtzite InAs Nanowires

    Engineering Websites

    Yu, Edward T.

    Structural and Room-Temperature Transport Properties of Zinc Blende and Wurtzite InAs Nanowires between pure zinc blende (ZB) NWs and wurtzite (WZ) NWs containing stacking faults and small ZB segments. Pure zinc blende (ZB) InAs NWs grown on SiO2/Si substrates are characterized by a rotational twin along

  13. Nanorodnanosheet hierarchically structured ZnO crystals on zinc foil as flexible photoanodes for

    Materials Science Websites

    Cao, Guozhong

    Nanorod­nanosheet hierarchically structured ZnO crystals on zinc foil as flexible photoanodes method on zinc foil and used as flexible photoanodes in dye-sensitized solar cells (DSCs). Compared to synthesize nanoowers composed of nanorods (NR) on zinc foil which could be used as a exible photoanode

  14. A comprehensive approach to zinc-finger recombinase customization enables genomic

    Biology and Medicine Websites

    Barbas III, Carlos F.

    A comprehensive approach to zinc-finger recombinase customization enables genomic targeting Received December 18, 2012; Revised January 16, 2013; Accepted January 17, 2013 ABSTRACT Zinc of serine recombinases and a custom-designed zinc-finger DNA-binding domain. The use of ZFRs, however, has

  15. The pure rotational spectrum of ZnCl (X2 Variations in zinc halide bonding

    Chemistry Websites

    Ziurys, Lucy M.

    The pure rotational spectrum of ZnCl (X2 R+ ): Variations in zinc halide bonding E.D. Tenenbaum, M) in character, suggesting that the zinc chloride bond is rela- tively ionic. Published by Elsevier Inc. Keywords: Zinc chloride (ZnCl); Microwave spectroscopy; Rotational spectroscopy; Hyperfine structure 1

  16. Kinetic Analysis of the Zinc-Dependent Deacetylase in the Lipid A Biosynthetic Pathway

    Chemistry Websites

    Zhou, Pei

    Kinetic Analysis of the Zinc-Dependent Deacetylase in the Lipid A Biosynthetic Pathway Amanda L. Mc-negative bacteria is catalyzed by the zinc-dependent hydrolase LpxC that removes an acetate from the nitrogen base for deprotonation and activation of the zinc-bound water. Lipopolysaccharide (LPS)1 is a unique

  17. Zinc-blende ZnO and its role in nucleating wurtzite tetrapods and twinned nanowires

    Materials Science Websites

    Wang, Zhong L.

    Zinc-blende ZnO and its role in nucleating wurtzite tetrapods and twinned nanowires Yong Ding 2007 In this letter, the authors directly observed the zinc-blende ZB ZnO core in the initial formation techniques.1­3 These materials can be cubic zinc blende ZB and hexagonal wurtzite WZ , in which each atom

  18. In silico abstraction of zinc finger nuclease cleavage profiles reveals an expanded landscape

    Chemistry Websites

    Liu, David R.

    In silico abstraction of zinc finger nuclease cleavage profiles reveals an expanded landscape of therapeutic applications. Recently, two improved methods for identifying the off-target effects of zinc finger. INTRODUCTION Gene-editing nucleases, such as zinc finger nucleases (ZFNs), transcription activator

  19. Viscoelastic Properties of Sulfonated Ethylene-Propylene Terpolymer Neutralized with Zinc Cation

    Materials Science Websites

    Granick, Steve

    Viscoelastic Properties of Sulfonated Ethylene- Propylene Terpolymer Neutralized with Zinc Cation-propylene terpolymer (EPDM), neutralized with zinc cation. The sulfonation levels were 15 to 20 meq/100 g polymer (0.47 and 0.62 mol %), and for each level the effect of the ionic plasticizer, zinc stearate, was investigated

  20. Rising zinc: a significant cause of ischemic neuronal death in the CA1 region of rat

    Biology and Medicine Websites

    Li, Yang V.

    Rising zinc: a significant cause of ischemic neuronal death in the CA1 region of rat hippocampus; zinc; cell death Introduction Neurons undergo changes in ion homeostasis as a result of normal- mulation of zinc (Zn2 + ) in oxygen-glucose depriva- tion and reoxygenation (OGD/R; Stork and Li, 2006a

  1. Identification and Characterization of ZFP-57, a Novel Zinc Finger Transcription Factor in the Mammalian Peripheral

    Biology and Medicine Websites

    Jessen, Kristjan R

    Identification and Characterization of ZFP-57, a Novel Zinc Finger Transcription Factor To isolate new zinc finger genes expressed at early stages of peripheral nerve development, we have used PCR to amplify conserved zinc finger sequences. RNA from rat embryonic day 12 and 13 sciatic nerves, a stage when

  2. Zinc Phosphate with Gigantic Pores of 24 Tetrahedra Guo-Yu Yang and Slavi C. Sevov*

    Chemistry Websites

    Zinc Phosphate with Gigantic Pores of 24 Tetrahedra Guo-Yu Yang and Slavi C. Sevov* Department frameworks are glassy-like. Here we report the synthesis and structure of a zinc phosphate, Zn3(PO4)2(PO3OH zinc borophosphate analogous to a known ethylenediamine-templated cobalt borophosphate;13 therefore

  3. Solution-processed zinc tetrabenzoporphyrin thin-films and transistors Patrick B. Shea a,

    Engineering Websites

    Kanicki, Jerzy

    Solution-processed zinc tetrabenzoporphyrin thin-films and transistors Patrick B. Shea a, , Hiroko a solution-processable precursor of zinc tetra- benzoporphyrin (ZnTBP) are reported. Amorphous, insulating heterojunction organic photovoltaics (OPVs) [4,5]. Zinc porphyrins in particular, due to their unique optical

  4. Calculation of critical dimensions for wurtzite and cubic zinc blende coaxial nanowire heterostructures

    Materials Science Websites

    Yu, Edward T.

    Calculation of critical dimensions for wurtzite and cubic zinc blende coaxial nanowire-shell heterostructures in 111 zinc blende and 0001 wurtzite geometries. These calculations reveal that critical limits in both wurtzite and zinc blende structures. The results of these explorations are expected

  5. Plasma clearance of cadmium and zinc in non-acclimated and metal-acclimated trout

    Biology and Medicine Websites

    Grosell, Martin

    Plasma clearance of cadmium and zinc in non-acclimated and metal-acclimated trout M. Jasim concentration of waterborne cadmium (Cd, 26.7 nmol/l) or waterborne zinc (Zn, 2294 nmol/l) for 30 days to induce. Introduction Cadmium (Cd) and zinc (Zn) are trace elements that are common constituents of industrial efflu

  6. Neuroscience Letters 419 (2007) 119124 Fluorescence imaging study of extracellular zinc

    Biology and Medicine Websites

    Li, Yang V.

    2007-01-01

    Neuroscience Letters 419 (2007) 119­124 Fluorescence imaging study of extracellular zinc Elsevier Ireland Ltd. All rights reserved. Keywords: Zinc; Calcium; Fluorescence; Mossy fiber; Neurotransmitter; Synapse; FluoZin-3; Zinpyr-4; Newport Green Zinc (Zn2+) is found in a specific subset

  7. Selective Guest Binding by Tailored Channels in a 3-D Porous Zinc(II)-Benzenetricarboxylate Network

    Materials Science Websites

    Yaghi, Omar M.

    Selective Guest Binding by Tailored Channels in a 3-D Porous Zinc(II)-Benzenetricarboxylate Network solution containing 1,3,5-benzenetricarboxylic acid (H3BTC) and zinc(II) nitrate hexahydrate yields symmetric organic unit, 1,3,5-benzenetricarboxylate (BTC), and zinc(II) ion to form crystalline Zn2(BTC)(NO3

  8. Integrative analysis of the zinc finger transcription factor Lame duck in the Drosophila myogenic

    Biology and Medicine Websites

    Bulyk, Martha L.

    Integrative analysis of the zinc finger transcription factor Lame duck in the Drosophila myogenic downstream of the Drosophila zinc finger TF Lame duck (Lmd) by combining both previously published and newly in the specification of FCMs is a member of the Gli superfamily of zinc finger TFs, Lame duck (Lmd) (5, 7, 8

  9. Expanding the zinc-finger recombinase repertoire: directed evolution and mutational analysis of serine

    Chemistry Websites

    Barbas III, Carlos F.

    engineering are transforming basic biological research and biotechnology by allowing researchers to induce with custom-designed Cys2­His2 zinc-finger proteins results in the creation of engineered zinc- finger recombinases (ZFRs) capable of achieving targeted genetic modifications. The flexibility afforded by zinc

  10. A Proton-Dependent Zinc Uptake in PC12 Cells Rengarajan V. Balaji1,2

    Biology and Medicine Websites

    A Proton-Dependent Zinc Uptake in PC12 Cells Rengarajan V. Balaji1,2 and Robert A. Colvin1 loading' the cells and the effect of such a change on radioactive zinc uptake was studied. It was found that zinc uptake was stimulated in cells loaded with protons without causing any measurable change

  11. Photophysical and Energy-Transfer Properties of (Salen)zinc Complexes and Supramolecular Assemblies

    Renewable Energy Websites

    FULL PAPER Photophysical and Energy-Transfer Properties of (Salen)zinc Complexes and Supramolecular fluoresce in solution, displaying photophysical be- havior similar to typical (porphyrin)zinc complexes and behavior of func- tionalized, photo-excited (salen)zinc species, both isolated complexes 1 and 2

  12. Presynaptic Evidence for Zinc Release at the Mossy Fiber Synapse of

    Biology and Medicine Websites

    Li, Yang V.

    Presynaptic Evidence for Zinc Release at the Mossy Fiber Synapse of Rat Hippocampus Joshua K, Ohio Vesicular zinc (Zn21 ) is found in a subset of glutamater- gic nerve terminals throughout'' or ``free'' zinc. The anatomical location of this cation and its possible colocalization with glutamate have

  13. Reaction Mechanism of the Trinuclear Zinc Enzyme Phospholipase C: A Density Functional Theory Study

    Chemistry Websites

    Liao, Rongzhen

    Reaction Mechanism of the Trinuclear Zinc Enzyme Phospholipase C: A Density Functional Theory StudyVed: January 14, 2010 Phosphatidylcholine-preferring phospholipase C is a trinuclear zinc agreement with experimental kinetic studies. The zinc ions are suggested to orient the substrate

  14. Randomized controlled trial of prenatal zinc supplementation and the development of fetal heart rate

    Biology and Medicine Websites

    Dominici, Francesca

    Randomized controlled trial of prenatal zinc supplementation and the development of fetal heart ­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­ Objectives: This study was undertaken to evaluate whether prenatal zinc supplementation affects maturation- taining 60 mg iron, 250 mg folic acid with or without 25 mg zinc. Fetal heart rate (mean FHR, variability

  15. Journal of the European Ceramic Society 27 (2007) 941945 Synthesis of nanosized zinc ferrites from liquid

    Materials Science Websites

    Gubicza, Jenõ

    2007-01-01

    Journal of the European Ceramic Society 27 (2007) 941­945 Synthesis of nanosized zinc ferrites from Available online 6 June 2006 Abstract Micro- and nanosized zinc ferrite particles were prepared in RF thermal plasma conditions. Ethanol solutions of the mixture of zinc- and iron- nitrates were used

  16. Exploring the DNA-binding specificities of zinc fingers with DNA microarrays

    Biology and Medicine Websites

    Bulyk, Martha L.

    Exploring the DNA-binding specificities of zinc fingers with DNA microarrays Martha L. Bulyk microarray-based method to char- acterize sequence-specific DNA recognition by zinc-finger proteins. A phage of the mouse Zif268 domain, provided a rich source of zinc-finger proteins with variant DNA

  17. Performance Enhancement of a Graphene-Zinc Phosphide Solar Cell Using the Electric Field-Effect

    Materials Science Websites

    Javey, Ali

    Performance Enhancement of a Graphene-Zinc Phosphide Solar Cell Using the Electric Field with an Earth-abundant and low cost zinc phosphide (Zn3P2) thin-film light absorber. Adding a semitransparent to demonstrate the control of the energy barrier and depletion width in the zinc phosphide. Our photovoltaic

  18. Specific insertions of zinc finger domains into Gag-Pol yield engineered retroviral vectors

    Biotechnology Websites

    Specific insertions of zinc finger domains into Gag-Pol yield engineered retroviral vectors properties. We found seven permissive zinc finger domain (ZFD) insertion sites throughout Gag-Pol, including sequence-specific DNA-binding domains--includ- ing the Sp1 zinc finger domain (ZFD), the DNA-binding domain

  19. The Many Roads Leading to Rome: Solving Zinc Models by Various Solvers

    Computer Technologies and Information Sciences Websites

    Huang, Jinbo

    The Many Roads Leading to Rome: Solving Zinc Models by Various Solvers Ralph Becket1,2 , Sebastian, Canberra 4 Monash University, Melbourne Australia Abstract. Zinc is a solver-independent modelling language reformulate and solve a Zinc model using various solving technologies. 1 Introduction The practical relevance

  20. The Design of the Zinc Modelling Language KIM MARRIOTT kim.marriott@infotech.monash.edu.au

    Computer Technologies and Information Sciences Websites

    Garcia de la Banda, Maria

    The Design of the Zinc Modelling Language KIM MARRIOTT kim.marriott@infotech.monash.edu.au Clayton.wallace@infotech.monash.edu.au Clayton School of IT, Monash University, Vic. 3800, Australia Abstract. Zinc is a new modelling language developed as part of the G12 project. It has four important characteristics. First, Zinc allows

  1. Theoretical study of nonpolar surfaces of aluminum nitride: Zinc blende ,,110... and wurtzite ,,1010...

    Physics Websites

    Pandey, Ravi

    Theoretical study of nonpolar surfaces of aluminum nitride: Zinc blende ,,110... and wurtzite ,,101 structure and electronic properties of the nonpolar surfaces, namely zinc blende 110 and wurtzite (10 1 although thin films of zinc- blende polytype were grown as well. For the bulk phase of AlN, recent

  2. Computational Investigation of Irreversible Inactivation of the Zinc-Dependent Protease Carboxypeptidase A

    Chemistry Websites

    Schlegel, H. Bernhard

    Computational Investigation of Irreversible Inactivation of the Zinc-Dependent ProteaseVersity of Notre Dame, Notre Dame, Indiana 46556 ReceiVed: October 1, 2004; In Final Form: January 5, 2005 Zinc proteases are ubiquitous and the zinc ion plays a central function in the catalytic mechanism

  3. Mechanical properties of zinc and calcium phosphates: Structural insights and relevance to anti-wear functionality

    Materials Science Websites

    Mueser, Martin

    Mechanical properties of zinc and calcium phosphates: Structural insights and relevance to anti to quite dramatic, the latter being the case in particular for low-coordinated zinc phosphates containing and rubbing. New results on the aging of zinc phosphate tribo films are presented as well. The softening

  4. Randomized controlled trial of prenatal zinc supplementation and fetal bone growth13

    Biology and Medicine Websites

    Dominici, Francesca

    Randomized controlled trial of prenatal zinc supplementation and fetal bone growth1­3 Mario, and Janet A Dipietro ABSTRACT Background: Maternal zinc deficiency is relatively common in developing whether improvement in ma- ternal gestational zinc status is positively associated with fetal growth

  5. DOI: 10.1002/cbic.200700489 Zinc(II) Coordination Complexes as Membrane-Active

    Chemistry Websites

    Smith, Bradley D.

    DOI: 10.1002/cbic.200700489 Zinc(II) Coordination Complexes as Membrane-Active Fluorescent Probes charge.[9] This study focuses on the cell recognition properties of syn- thetic zinc coordination] Recently, we discovered that fluorescent coordination complexes 1, which has two zinc(II) 2

  6. Phase controlled synthesis of ZnS nanobelts: zinc blende vs wurtzite Yong Ding a

    Materials Science Websites

    Wang, Zhong L.

    Phase controlled synthesis of ZnS nanobelts: zinc blende vs wurtzite Yong Ding a , Xu Dong Wang crystals of ZnS usually take the zinc blende structure. However, the vapor deposited one-dimensional Zn which the formed phase can be con- trolled between zinc blende and wurtzite in nanomaterials synthesis

  7. Electron-Beam Formation from Spin-Orbit Interactions in Zinc-Blende Semiconductor Quantum Wells

    Physics Websites

    Flatte, Michael E.

    Electron-Beam Formation from Spin-Orbit Interactions in Zinc-Blende Semiconductor Quantum Wells in a two-dimensional quantum well made from a zinc-blende semiconductor. This ``electron-beam'' formation to the quantum well and the intrinsic spin-orbit field of the zinc-blende crystal lattice in a quantum well

  8. Dipeptide hydrolysis by the dinuclear zinc enzyme human renal dipeptidase: Mechanistic insights from DFT calculations

    Chemistry Websites

    Liao, Rongzhen

    Dipeptide hydrolysis by the dinuclear zinc enzyme human renal dipeptidase: Mechanistic insights 2009 Available online 1 October 2009 Keywords: Dipeptidase Dinuclear zinc enzymes Reaction mechanism Density functional theory a b s t r a c t The reaction mechanism of the dinuclear zinc enzyme human renal

  9. Zinc distribution and speciation in Arabidopsis halleri Arabidopsis lyrata progenies presenting

    Physics Websites

    Zinc distribution and speciation in Arabidopsis halleri · Arabidopsis lyrata progenies presenting various zinc accumulation capacities Ge´raldine Sarret1 , Glenda Willems2 , Marie-Pierre Isaure1 , Matthew of this study was to investigate the relationship between the chemi- cal form and localization of zinc (Zn

  10. Interactions of Silicate Ions with Zinc(II) and Aluminum(III) in Alkaline Aqueous Solution

    Geosciences Websites

    Sahai, Nita

    Interactions of Silicate Ions with Zinc(II) and Aluminum(III) in Alkaline Aqueous Solution Michel R solution form complexes with zinc(II) (present as zincate, Zn(OH)3 - or Zn(OH)4 2- ) and, concomitantly(IV) in experimental animals is known9-12 to affect the metabolism of zinc(II), which is essential for the formation

  11. ORIGINAL ARTICLE Zinc induces disorder-to-order transitions in free

    Materials Science Websites

    Dutcher, John

    ORIGINAL ARTICLE Zinc induces disorder-to-order transitions in free and membrane such as zinc. Here, we investigate two dehydrins (denoted as TsDHN-1 and TsDHN-2) from Thellungiella salsuginea is induced and stabilized in these proteins, both in free and vesicle-bound form, by association with zinc

  12. Crystal structure of the BcZBP, a zinc-binding protein from Bacillus cereus

    Biology and Medicine Websites

    Glykos, Nikolaos

    Crystal structure of the BcZBP, a zinc-binding protein from Bacillus cereus Functional insights to the understanding of the role Keywords Bacillus cereus; deacetylase; hydrolase; Rossmann fold; zinc-dependent enzyme infectious B. anthracis. The zinc-binding protein of B. cereus, BcZBP, is encoded from the bc1534 gene which

  13. Low-Loss, Tunable Microwave Capacitors Using Bismuth Zinc Niobate Thin Films

    Engineering Websites

    York, Robert A.

    Low-Loss, Tunable Microwave Capacitors Using Bismuth Zinc Niobate Thin Films Jaehoon Park, Jiwei dielectric constant material, bismuth zinc niobate that combines low dielectric losses with an electric microwave devices. Keyword: low loss, thin film, capacitors, dielectric properties, bismuth zinc niobate I

  14. ZINC: Efficient Indexing for Skyline Computation Bin Liu Chee-Yong Chan

    Computer Technologies and Information Sciences Websites

    Chan, Chee Yong

    ZINC: Efficient Indexing for Skyline Computation Bin Liu Chee-Yong Chan Department of Computer present a new indexing method named ZINC (for Z-order In- dexing with Nested Code) that supports efficient innovation in ZINC is based on combining the strengths of the ZB-tree, which is the state-of-the-art index

  15. SYNTHESIS OF ZINC FERRITE NANOPOWDERS IN AN RF THERMAL PLASMA , J. Szpvlgyi1

    Materials Science Websites

    Gubicza, Jenõ

    SYNTHESIS OF ZINC FERRITE NANOPOWDERS IN AN RF THERMAL PLASMA I. Mohai1 , J. Szépvölgyi1 , J University, P.O.B. 32, Budapest, H-1518, Hungary Abstract Nanosized zinc ferrite spinel powders of various in which tetrahedral (A) an octahedral (B) interstitial sites are occupied by cations [1]. Zinc ferrite

  16. Tuning the Hydrophobicity of Zinc Dipyridyl Paddlewheel Metal-Organic Frameworks for Selective Sorption

    Renewable Energy Websites

    Tuning the Hydrophobicity of Zinc Dipyridyl Paddlewheel Metal- Organic Frameworks for Selective ABSTRACT: A series of isostructural noncatenated, water-stable zinc-based dipyridyl pillared water-stable zinc-cornered pillared-paddlewheel MOFs by varying the length of appended alkyl chains

  17. Mobile trap algorithm for zinc detection using protein sensors Munish V. Inamdar

    Engineering Websites

    Sastry, Ann Marie

    Mobile trap algorithm for zinc detection using protein sensors Munish V. Inamdar Department present a mobile trap algorithm to sense zinc ions using protein-based sensors such as carbonic anhydrase CA . Zinc is an essential biometal required for mammalian cellular functions although its

  18. Adaptive evolution drives the diversification of zinc-finger binding domains.

    Biology and Medicine Websites

    Durrett, Richard

    1 Adaptive evolution drives the diversification of zinc-finger binding domains. Deena Schmidt words: tandem gene duplication, adaptive evolution, zinc-finger genes Running Head: Adaptive evolution of zinc-finger genes * Corresponding Author: 523 Malott Hall, Cornell U. Ithaca NY 14853 Phone: (607) 255

  19. Zinc Deficiency Impacts CO2 Assimilation and Disrupts Copper Homeostasis in Chlamydomonas reinhardtii*S

    Renewable Energy Websites

    Zinc Deficiency Impacts CO2 Assimilation and Disrupts Copper Homeostasis in Chlamydomonas-concentrating mechanism and disrupts copper homeostasis. Significance: Cross-talk exists between zinc and copper homeostasis pathways. Zinc is an essential nutrient because of its role in catalysis and in protein

  20. Peptide functionalized superparamagnetic iron oxide nanoparticles as MRI contrast agents

    Engineering Websites

    Atalar, Ergin

    ) is one of the most powerful non- invasive techniques for disease diagnosis. Due to its capability any damage, it attracts intense interest in clinical studies and became one of the most powerful candidates for imaging techniques.1 MRI can measure the water content of the tissue and excited nuclear spins

  1. SUPPORTING INFORMATION Vacancy Coalescence During Oxidation of Iron Nanoparticles

    Physics Websites

    ,6 A. Paul Alivisatos1,3,6 1 Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, 2 Institut Català d' Estudis i Recerca Avançat & Institut Catalá de Nanotecnologia E-08193 Bellaterra. Barcelona, 3 Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA

  2. DEVELOPMENTAL PHYTOTOXICITY OF METAL OXIDE NANOPARTICLES TO ARABIDOPSIS THALIANA

    Environmental Management and Restoration Websites

    Alvarez, Pedro J.

    to understand the potential environmental impacts of manufactured nano- materials. Here, we report- bers of commercial products, from cosmetics to medicine, incorporate manufactured nanomaterials (MNMs to absorb water and fertilizer, and stimu- lated the antioxidant system [12]. The addition of nTiO2 at 2

  3. Discovery of Zinc, Selenium, Bromine, and Neodymium Isotopes

    CERN Preprints

    Gross, J L; Kathawa, J; Thoennessen, M

    2010-01-01

    Currently, thirty-two zinc, thirty-two selenium, twenty-nine bromine and thirty-one neodymium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

  4. Mechanisms of lead, copper, and zinc retention by phosphate rock

    Environmental Management and Restoration Websites

    Ma, Lena

    Mechanisms of lead, copper, and zinc retention by phosphate rock Xinde Caoa,*, Lena Q. Maa , Dean R of fluoropyromorphite is primarily responsible for Pb immobilization by phosphate rock, whereas Cu and Zn retention reaction between phosphate rock (PR) and metals (Pb, Cu, and Zn) was studied. Phosphate rock has

  5. Plant-based FRET biosensor discriminates environmental zinc levels

    Environmental Sciences and Ecology Websites

    dePamphilis, Claude

    , environ- mental monitoring, ZIP transporter, ECFP, DsRED. Summary Heavy metal accumulation was monitored by a confocal microscope and had a 1.4-fold increase in intensity as the metal concentration specific heavy metals that pose environmental risks. Introduction Zinc (Zn) levels can build up

  6. Effect of Natural Organic Matter on Zinc Inhibition of Hematite

    Environmental Management and Restoration Websites

    Burgos, William

    to produce Fe- (II)-rich reactive zones for the in situ treatment of contami- nated groundwater. Iron)topromotethedevelopmentofanaerobicconditions in a targeted subsurface location (1, 2). Additional amend- ments to promote iron(III) reduction could include(III) reduction. Zinc was selected for study because it is a common groundwater contaminant at U.S. Department

  7. Discovery of Zinc, Selenium, Bromine, and Neodymium Isotopes

    Nuclear Experiment (arXiv)

    J. L. Gross; J. Claes; J. Kathawa; M. Thoennessen

    2010-12-09

    Currently, thirty-two zinc, thirty-two selenium, twenty-nine bromine and thirty-one neodymium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

  8. Automated Morphology Analysis of Nanoparticles 

    Texas A&M University - TxSpace

    Park, Chiwoo

    2012-10-19

    by generic image processing and bio-imaging methods. This is due to the unique features that the electron microscopic pictures of nanoparticles have, including special particle overlap structures, and large number of particles to be processed. The application...

  9. Applications of nanoparticles of gamma Fe2O3 for hyperthermia in E.coli by Nd:YAG laser

    CERN Preprints

    Kundu, Srikanya; Kulkarni, S D; Pasricha, Renu; Das, A K; Kulkarni, G R; Bhoraskar, S V

    2007-01-01

    The paper explores the use of nanoparticles of gamma Fe2O3 for hyperthermia treatment of living organisms by absorption of 1064 nm radiations from Nd:YAG laser. Escherichia coli cells have been used as the model system for demonstrating the effect wherein lysine is used as an interface between the cell walls and the nanoparticles. Scanning Electron Microscopic observations have, exclusively, proved that attachment of nanoparticles of iron oxide along with lysine alone is responsible for absorption of above radiations. The quantitative estimation has been provided by growth rate measurements and protein assessment of the cells. The nanoparticles of gamma Fe2O3 were synthesized by DC arc plasma assisted gas phase condensation.

  10. Crystallographically oriented magnetic ZnFe2O4 nanoparticles synthesized by Fe implantation into ZnO

    CERN Preprints

    Zhou, S; Reuther, H; Talut, G; Eichhorn, F; Von Borany, J; Skorupa, W; Helm, M; Fassbender, J; Zhou, Shengqiang

    2006-01-01

    In this paper, a correlation between structural and magnetic properties of Fe implanted ZnO is presented. High fluence Fe^+ implantation into ZnO leads to the formation of superparamagnetic alpha-Fe nanoparticles. High vacuum annealing at 823 K results in the growth of alpha-Fe particles, but the annealing at 1073 K oxidized the majority of the Fe nanoparticles. After a long term annealing at 1073 K, crystallographically oriented ZnFe2O4 nanoparticles were formed inside ZnO with the orientation relationship of ZnFe2O4(111)[110]//ZnO(0001)[1120]. These ZnFe2O4 nanoparticles show a hysteretic behavior upon magnetization reversal at 5 K.

  11. Published: May 10, 2011 r 2011 American Chemical Society 10426 dx.doi.org/10.1021/jp2013545 |J. Phys. Chem. C 2011, 115, 1042610430

    Physics Websites

    Pandey, Ravi

    required. For example, zinc oxide (ZnO) nanoparticles (NPs) have emerged themselves as a class apart due/-selectivity of the nanoparticles. The present status, therefore, requires a more detailed knowledge of the oxideÀ biomolecules to bind with a ring nitrogen atom having a lone electron pair relative to the other possible binding sites

  12. Surface-initiated polymerization from TiO2 nanoparticle surfaces through a biomimetic initiator: A new route toward

    Biology and Medicine Websites

    : A new route toward polymer­matrix nanocomposites Xiaowu Fan, Lijun Lin, Phillip B. Messersmith October 2005; accepted 5 October 2005 Available online 15 November 2005 Abstract Polymer nanocomposites functionalized metal oxide nanoparticles that may be useful for construction of functional polymer nanocomposites

  13. Controlled growth of Co nanoparticle assembly on nanostructured template Al2O3/NiAl,,100...

    Materials Science Websites

    Lin, Minn-Tsong

    Controlled growth of Co nanoparticle assembly on nanostructured template Al2O3/NiAl,,100... Wen, and alignment is demonstrated to be feasible on a nanostructured template Al2O3/NiAl 100 . At 140­170 K, a slow2O3 layer grown on NiAl 100 through high temperature oxidation provides a su- perior template

  14. Surface Functionalization of Monodisperse Magnetic Nanoparticles

    MIT - DSpace

    Lattuada, Marco

    We present a systematic methodology to functionalize magnetic nanoparticles through surface-initiated atom-transfer radical polymerization (ATRP). The magnetite nanoparticles are prepared according to the method proposed ...

  15. Nanothermodynamics of metal nanoparticles Zhen Hua Lia

    Chemistry Websites

    Truhlar, Donald G

    nanoparticles increases with decreasing particle size. The above arguments show that the physical and chemical have been widely used as functional materials in physics, chemistry, and biology. Understanding, phase changes, and thermodynamic functions of aluminum nanoparticles. We discuss using statistical

  16. Inoculation of silicon nanoparticles with silver atoms

    Physics Websites

    Nordlund, Kai

    of the interaction at the interface between the different components, these nanoparticles usually possess optical of fluorescent and plasmonic materials in a single nanoparticle is attractive for multi-modal bio

  17. Supramolecular Nanoparticles for Molecular Diagnostics and Therapeutics

    University of California eScholarship Repository

    Chen, Kuan-Ju

    2012-01-01

    4] and nanoparticle, [5] to enhance the uptake of proteinand nanoparticle, [99a, 122] to enhance the uptake of proteinnanoparticle-based vectors capable of delivering a variety of loads, such as gene, drugs, proteins, and

  18. Nanoparticle Measurements in Parallel Artificial Bilayers

    University of California eScholarship Repository

    Smith, Tyler

    2014-01-01

    protein interactions [1]. With an abundance of nanoparticlenanoparticle is released [2]. Another important use for nanoparticles is in proteinproteins which makes them suitable for tagging or labeling. Size alone does not justify a nanoparticle

  19. Sweet plasmonics: Sucrose macrocrystals of metal nanoparticles

    Materials Science Websites

    Demir, Hilmi Volkan

    Sweet plasmonics: Sucrose macrocrystals of metal nanoparticles Talha Erdem1 , Zeliha Soran-Erdem1-Verlag Berlin Heidelberg 2014 KEYWORDS plasmonics, macrocrystals, metal nanoparticles, metal enhanced fluorescence, colloidal quantum dots ABSTRACT The realization of plasmonic structures generally necessitates

  20. Nanofabricated upconversion nanoparticles for photodynamic therapy

    Biology and Medicine Websites

    Nanofabricated upconversion nanoparticles for photodynamic therapy Baris Ungun,1 Robert K. Prud, "Upconverting nanoparticles as nanotransducers for photodynamic therapy in cancer cells," Nanomed. 3, 73, "Versatile photosensitizers for photodynamic therapy at infrared excitation," J. Am. Chem. Soc. 129, 4526

  1. : A Mutation in the Human Herpes Simplex Virus Type 1 UL52 Zinc Finger Motif Results in Defective Primase Activity but Can Recruit Viral Polymerase

    Biology and Medicine Websites

    Huang, Ching-Tsan

    : A Mutation in the Human Herpes Simplex Virus Type 1 UL52 Zinc Finger Motif Results in Defective zinc finger 986 (Phe) HSV (Leu) HSV L986F(LeuPhe) UL52 primase primase 10~25% helicase [4][4, 5] UL52 zinc finger [1, 6] zinc finger UL52 zinc finger helicase/primase HSV 984

  2. Effects of zinc on Salmonella in the layer house environments and laying hens, and the ability of zinc to induce molt in laying hens 

    Texas A&M University - TxSpace

    Park, Shinyoung

    2005-02-17

    or anaerobic conditions, the effects of combinating zinc and acidic conditions on the growth kinetics of Salmonella in vitro under aerobic or anaerobic conditions, and the effects of zinc amended feed on the survival of a dry inoculum of Salmonella. The third...

  3. Influence of Vacancies on the Nanoparticle Pulsation

    Condensed Matter (arXiv)

    M. A. Korshunov

    2007-07-14

    Computer modeling of the one-dimensional and three-dimensional nanoparticles with Van-der-Waals interaction was performed. The arrangement of atoms was defined on the grounds of an energy minimum. The calculations have shown that in the presence of vacancies in a nanoparticle and the account of a relaxation and oscillations the nanoparticle will pulse. This pulsation on distance between atoms of a nanoparticle is observed in both one-dimensional and a three-dimensional cases.

  4. Anti-reflection zinc oxide nanocones for higher efficiency thin-film silicon solar cells

    MIT - DSpace

    Mailoa, Jonathan P

    2012-01-01

    Thin film silicon solar cells, which are commonly made from microcrystalline silicon ([mu]c-Si) or amorphous silicon (a-Si), have been considered inexpensive alternatives to thick polycrystalline silicon (polysilicon) solar ...

  5. p-Type Zinc Oxide Spinels: Application to Transparent Conductors and Spintronics

    CERN Preprints

    Stoica, Maria

    2013-01-01

    We report on the electronic and optical properties of two theoretically predicted stable spinel compounds of the form ZnB2O4, where B = Ni or Cu; neither compound has been previously synthesized, so we compare them to the previously studied p-type ZnCo2O4 spinel. These new materials exhibit spin polarization that is ideal for spintronics applications, and broad conductivity maxima near the valence band edge that facilitate p-type dopability. We show that 3d electrons on the octahedrally coordinated Zn atom fall deep within the valence band and do not contribute significantly to the electronic structure of the material, while the O 2p and tetrahedrally coordinated B 3d electrons hybridize broadly in the shallow valence states, resulting in increasing curvature (i.e., decreased electron effective mass) of valence bands near the band edge. In particular, ZnCu2O4 exhibits high electrical conductivities near the valence band edge that, at sigma = 2 x 10^4 S/cm, are twice the maximum found for ZnCo2O4, a previously...

  6. Searching Room Temperature Ferromagnetism in Wide Gap Semiconductors Fe-doped Strontium Titanate and Zinc Oxide

    CERN Preprints

    Pereira, LMC; Wahl, U

    Scientific findings in the very beginning of the millennium are taking us a step further in the new paradigm of technology: spintronics. Upgrading charge-based electronics with the additional degree of freedom of the carriers spin-state, spintronics opens a path to the birth of a new generation of devices with the potential advantages of non-volatility and higher processing speed, integration densities and power efficiency. A decisive step towards this new age lies on the attribution of magnetic properties to semiconductors, the building block of today's electronics, that is, the realization of ferromagnetic semiconductors (FS) with critical temperatures above room temperature. Unfruitful search for intrinsic RT FS lead to the concept of Dilute(d) Magnetic Semiconductors (DMS): ordinary semiconductor materials where 3 d transition metals randomly substitute a few percent of the matrix cations and, by some long-range mechanism, order ferromagnetically. The times are of intense research activity and the last fe...

  7. STRAIN SENSING WITH PIEZOELECTRIC ZINC OXIDE THIN FILMS FOR VIBRATION SUPPRESSION IN HARD DISK DRIVES

    Engineering Websites

    Horowitz, Roberto

    This paper describes the integration of thin film ZnO strain sensors onto hard disk drive suspensions onto steel wafers that were subsequently made into in- strumented suspensions. Prototype instrumented suspensions were installed into commercial hard drives and tested. For the first time, a sensing signal

  8. Water-Soluble Thin Film Transistors and Circuits Based on Amorphous Indium-Gallium-Zinc Oxide

    Materials Science Websites

    Rogers, John A.

    ) by the US Food and Drug Administration (FDA) for dental restoring materials.28,29 Also, living cells exposed Engineering, Incheon National University, Incheon 406-772, Korea Department of Materials Science Institute for Advanced Science and Technology, and Frederick Seitz Materials Research Laboratory, University

  9. Atomic-layer-deposited zinc oxide as tunable uncooled infrared microbolometer material

    Engineering Websites

    Akin, Tayfun

    , Turkey 2 Department of Electrical and Electronics Engineering, Institute of Materials Science and Nanotechnology, UNAM ­ National Nanotechnology Research Center, Bilkent University, Ankara 06800, Turkey 3, Turkey 4 Department of Electrical and Electronics Engineering, METU MEMS ­ Micro Electro Mechanical

  10. Nanopropeller arrays of zinc oxide Pu Xian Gao and Zhong L. Wanga)

    Materials Science Websites

    Wang, Zhong L.

    axis and enclosed by 21¯1¯0 surfaces, which grew first; the sixfold symmetric nanoblades are later, optoelectronic, photovoltaic devices, and sensors.1­5 Quasi-one-dimensional nanostructures of Zn. The structure and growth process of the nanopropellers will be presented. The effect of tempera- ture gradient

  11. Processing and Characterization of P-Type Doped Zinc Oxide Thin Films 

    Texas A&M University - TxSpace

    Myers, Michelle Anne

    2013-03-18

    electron microscopy in all of the p-type films. Photoluminescence studies on n-type and p-type Ag-doped ZnO thin films demonstrate the role of stacking faults in determining the conductivity of the films. Exciton emission attributed to basal plane stacking...

  12. Evolution of zinc oxide nanostructures through kinetics control Yong Ding,c

    Materials Science Websites

    Wang, Xudong

    DOI: 10.1039/c1jm10918a In-depth understanding of the kinetics of the vapor deposition process-scale nanomanufacturing technology. In this paper, we report a systematic study of the vapor deposition kinetics of Zn and repeatability of NW manufacturing.9­19 Among several well- accepted NW growth strategies, vapor deposition

  13. Investigation of zinc oxide doped with metal impurities for use as thin film conductive phosphors 

    Texas A&M University - TxSpace

    Evatt, Steven R.

    1994-01-01

    Various technologies for manufacturing flat panel displays are currently being pursued world-wide. These include active matrix LCD, passive matrix LCD, and LED technologies, as well as several field emission approaches. To facilitate the development...

  14. Design of Zinc Oxide Based Solid-State Excitonic Solar Cell with Improved Efficiency 

    Texas A&M University - TxSpace

    Lee, Tao Hua

    2012-02-14

    Excitonic photovoltaic devices, including organic, hybrid organic/inorganic, and dye-sensitized solar cells, are attractive alternatives to conventional inorganic solar cells due to their potential for low cost and low temperature solution...

  15. Urchin-inspired zinc oxide as building blocks for nanostructured solar cells

    CERN Preprints

    Elias, Jamil; Utke, Ivo; Erni, Rolf; Hosseini, Davood; Michler, Johann; Philippe, Laetitia

    2012-01-01

    High surface area nanowire based architectures have been identified as important components for future optoelectronic nanodevices, solar cells, wettability coatings, gas sensors, and biofuel cells. Here we report on a novel urchin-inspired nanowire architecture: its interwoven three-dimensional, high-surface-area nanowire arrangement can be precisely controlled by using a low-cost and scalable synthesis based on a combination of nanosphere lithography, low-temperature atomic layer deposition, and electrodeposition. The performance of single-layer arrays of urchin-inspired ZnO nanowire building blocks competes to that of planar nanowire carpets. We illustrate this capability by fabricating fully-inorganic extremely thin absorber solar cells using CdSe as absorber and CuSCN as hole-collector material. The light diffusion of the urchin-inspired nanowire arrays was varied from 15% to 35%. Homogenous absorption in the wavelength range of 400-800 nm of up to 90% was obtained. Solar conversion efficiencies of ~ 1.33...

  16. Face-selective electrostatic control of hydrothermal zinc oxide nanowire synthesis

    MIT - DSpace

    Joo, Jaebum

    Rational control over the morphology and the functional properties of inorganic nanostructures has been a long-standing goal in the development of bottom-up device fabrication processes. We report that the geometry of ...

  17. Analysis of amorphous indium-gallium-zinc-oxide thin-film transistor contact metal

    University of Cambridge - Dspace

    Kiani, Ahmed; Hasko, David G.; Milne, William I.; Flewitt, Andrew J.

    2013-04-15

    3:ZnO (1:1:1) target (99.99% purity). Sputtering was performed in an argon atmosphere with the absence of an oxygen feed at room temperature and no intentional substrate heating. A 6-inch diameter ceramic target, 20 cm from the substrate, was used...

  18. Interaction of Nanoparticles with Radiation

    Astrophysics (arXiv)

    Aigen Li

    2003-11-04

    Interstellar grains span a wide range of sizes from a few angstroms to a few micrometers. The presence of nanometer-sized or smaller particles in the interstellar medium is indicated directly by the interstellar far ultraviolet (UV) extinction, the ubiquitous 3.3, 6.2, 7.7, 8.6, and 11.3$\\mum$ polycyclic aromatic hydrocarbon (PAH) emission features, the near and mid infrared broadband emission seen in the IRAS 12 and 25$\\mum$ bands and the COBE-DIRBE 3.5, 4.9, 12 and 25$\\mum$ bands, the 10--100$\\GHz$ Galactic foreground microwave emission, and indirectly by the heating of interstellar gas. For nanoparticles under interstellar conditions, UV/visible photon absorption is the dominant excitation process. With a heat capacity smaller than or comparable to the energy of an energetic stellar photon, nanoparticles are subject to single-photon heating, followed by vibrational relaxation, photoionization, and photodestruction. With excited electrons spatially confined, semiconductor nanoparticles are expected to luminesce efficiently. This review focuses on the photophysics of nanoparticles with emphasis on the stochastic heating and the vibrational excitation of interstellar PAH molecules, and the excitation of photoluminescence with special attention given to silicon nanoparticles.

  19. Silicon nanoparticles and interstellar extinction

    Astrophysics (arXiv)

    Victor G. Zubko; Tracy L. Smith; Adolf N. Witt

    1998-11-22

    To examine a recently proposed hypothesis that silicon nanoparticles are the source of extended red emission (ERE) in the interstellar medium, we performed a detailed modeling of the mean Galactic extinction in the presence of silicon nanoparticles. For this goal we used the appropriate optical constants of nanosized Si, essentially different from those of bulk Si due to quantum confinement. It was found that a dust mixture of silicon nanoparticles, bare graphite grains, silicate core-organic refractory mantle grains and three-layer silicate-water ice-organic refractory grains works well in explaining the extinction and, in addition, results in the acceptable fractions of UV/visible photons absorbed by silicon nanoparticles: 0.071-0.081. Since these fractions barely agree with the fraction of UV/visible photons needed to excite the observed ERE, we conclude that the intrinsic photon conversion efficiency of the photoluminescence by silicon nanoparticles must be near 100%, if they are the source of the ERE.

  20. Silicon nanoparticles and interstellar extinction

    CERN Preprints

    Zubko, V G; Witt, A N; Zubko, Victor G.; Smith, Tracy L.; Witt, Adolf N.

    1999-01-01

    To examine a recently proposed hypothesis that silicon nanoparticles are the source of extended red emission (ERE) in the interstellar medium, we performed a detailed modeling of the mean Galactic extinction in the presence of silicon nanoparticles. For this goal we used the appropriate optical constants of nanosized Si, essentially different from those of bulk Si due to quantum confinement. It was found that a dust mixture of silicon nanoparticles, bare graphite grains, silicate core-organic refractory mantle grains and three-layer silicate-water ice-organic refractory grains works well in explaining the extinction and, in addition, results in the acceptable fractions of UV/visible photons absorbed by silicon nanoparticles: 0.071-0.081. Since these fractions barely agree with the fraction of UV/visible photons needed to excite the observed ERE, we conclude that the intrinsic photon conversion efficiency of the photoluminescence by silicon nanoparticles must be near 100%, if they are the source of the ERE.

  1. Temperature Dependence of Cation Distribution and Oxidation State in Magnetic Mn-Fe Ferrite Nanocrystals

    Materials Science Websites

    Wang, Zhong L.

    applications such as contrast agents in magnetic resonance imaging (MRI).1 Due to their reduced sizesTemperature Dependence of Cation Distribution and Oxidation State in Magnetic Mn-Fe Ferrite 37831-6393 ReceiVed September 2, 1997 Abstract: The magnetic properties of spinel nanoparticles

  2. Colloidal stabilization via nanoparticle haloing

    Condensed Matter (arXiv)

    Jiwen Liu; Erik Luijten

    2005-08-12

    We present a detailed numerical study of effective interactions between micron-sized silica spheres, induced by highly charged zirconia nanoparticles. It is demonstrated that the effective interactions are consistent with a recently discovered mechanism for colloidal stabilization. In accordance with the experimental observations, small nanoparticle concentrations induce an effective repulsion that counteracts the intrinsic van der Waals attraction between the colloids and thus stabilizes the suspension. At higher nanoparticle concentrations an attractive potential is recovered, resulting in reentrant gelation. Monte Carlo simulations of this highly size-asymmetric mixture are made possible by means of a geometric cluster Monte Carlo algorithm. A comparison is made to results obtained from the Ornstein-Zernike equations with the hypernetted-chain closure.

  3. Metal Coupled Folding of Cys2His2 Zinc-Finger

    CERN Preprints

    Li, Wenfei; Wang, Jun; Wang, Wei

    2008-01-01

    Zinc-fingers, which widely exist in eukaryotic cell and play crucial roles in life processes, depend on the binding of zinc ion for their proper folding. To computationally study the zinc coupled folding of the zinc-fingers, charge transfer and metal induced protonation/deprotonation effects have to be considered. Here, by attempting to implicitly account for such effects in classical molecular dynamics and performing intensive simulations with explicit solvent for the peptides with and without zinc binding, we investigate the folding of the Cys2His2 type zinc-finger motif and the coupling between the peptide folding and zinc binding. We find that zinc ion not only stabilizes the native structure, but also participates in the whole folding process. It binds to the peptide at early stage of folding, and directs or modulates the folding and stabilizations of the component beta-hairpin and alpha-helix. Such a crucial role of zinc binding is mediated by the packing of the conserved hydrophobic residues. We also f...

  4. REGULATORY MECHANISMS OF SLC39A4 (ZIP4) AND SLC39A5 (ZIP5) IN THE ADAPTIVE RESPONSE TO ZINC AVAILABILITY

    University of Kansas - KU ScholarWorks

    Weaver, Benjamin Patrick

    2009-04-06

    expression. Altogether, this dissertation reveals that Zip4 and Zip5 are both regulated by intricate post-transcriptional mechanisms in response to zinc availability and that Zip4 is essential for development and proper zinc homeostasis...????????????????????????....xxv x Table of Contents Expanded Chapter 1 Background and Significance I. Zinc and Human Health???????????????????1 II. Zinc in Biology A. Zinc Coordination and Utilization?????????????..?.3 B. Overview of Zinc Homeostasis in Bacteria...

  5. Chromatic annuli formation and sample oxidation on copper thin films by femtosecond laser

    CERN Preprints

    He, Shutong; Pang, Dongqing; Wang, Chingyue; Hu, Minglie

    2015-01-01

    We report an experimental investigation on the irradiation of copper thin films with high repetition rate femtosecond laser pulses (1040 nm, 50 MHz), in ambient air and liquid water. We observe a novel, striking phenomenon of chromatic copper oxides (cupric oxide and cuprous oxide) annuli generation. The characteristic features of the chromatic copper oxide annuli are studied by exploiting micro-Raman Spectroscopy, Optical and Scanning Electron Microscopies. In the case of irradiation in water, the seldom investigated effects of the immersion time, after irradiation with a fixed number of pulses, is analyzed, and an intriguing dependence of the color of the chromatic annuli on the immersion time is observed. This remarkable behavior is explained by proposing an interpretation scenario addressing the various processes involved in the process. Our experimental findings show that cuprous oxide nanoparticles (size of ~20 nm) and cuprous oxide nanocubes (nanocube edges of ~30, ~60 nm) with extremely fine sizes can...

  6. Interpolymer Complex -Superparamagnetic Iron Oxide Nanoparticles for Detection of Oxidative Stress

    Computer Technologies and Information Sciences Websites

    Zhang, Zhongfei "Mark"

    Description: Inflammation is at the root of many diseases including atherosclerosis, a complex disease as the severity of disease. Contrast agents are often used with various imaging modalities to highlight tissues of interests, and the ability to target contrast agents to molecular cues of disease, i.e. molecular imaging

  7. Oxidation effect on templating of metal oxide nanoparticles within block copolymers

    Materials Science Websites

    Rubloff, Gary W.

    t Amphiphilic norbornene-b-(norbornene dicarboxylic acid) diblock copolymers with different block ratios were. Amphiphilic block copolymers such as poly(styrene-b-acrylic acid) (PS-PAA) and poly(norbornene- b

  8. Communications "Cubic" Colloidal Platinum Nanoparticles

    Materials Science Websites

    Wang, Zhong L.

    Communications "Cubic" Colloidal Platinum Nanoparticles T. S. Ahmadi,,§ Z. L. Wang, A. Henglein recently, colloidal platinum nanopar- ticles have been used as catalysts and photocatalysts in solutions.2 Aqueous colloidal platinum particles are mostly prepared by the reduction of a platinum salt by hydrogen

  9. PUBLISHED ONLINE: 23 DECEMBER 2012 | DOI: 10.1038/NGEO1679 Bioavailability of zinc in marine systems

    Geosciences Websites

    LETTERS PUBLISHED ONLINE: 23 DECEMBER 2012 | DOI: 10.1038/NGEO1679 Bioavailability of zinc, particularly during the Proterozoic eon, 2,500 to 542 million years ago1­4 . Of these trace metals, zinc (Zn

  10. Tris(2-pyridylmethyl)amine (TPA) as a membrane-permeable chelator for interception of biological mobile zinc

    MIT - DSpace

    Huang, Zhen

    We report the characterization of tris(2-pyridylmethyl)amine (TPA) as a membrane-permeable zinc chelator for intercepting biological mobile zinc. Compared to N,N,N?,N?-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN), TPA ...

  11. Vesicular Zinc Promotes Presynaptic and Inhibits Postsynaptic Long-Term Potentiation of Mossy Fiber-CA3 Synapse

    MIT - DSpace

    Pan, Enhui

    The presence of zinc in glutamatergic synaptic vesicles of excitatory neurons of mammalian cerebral cortex suggests that zinc might regulate plasticity of synapses formed by these neurons. Long-term potentiation (LTP) is ...

  12. Mineralogy and chemical forms of lead and zinc in abandoned mine wastes and soils: An example from Morocco

    Geosciences Websites

    Boni, Maria

    Mineralogy and chemical forms of lead and zinc in abandoned mine wastes and soils: An example from collected outside Mibladen. Zinc contamination is mainly restricted to Mibladen processing area, where Zn

  13. Magnetic Nanoparticle Targeted Hyperthermia of Cutaneous Staphylococcus aureus Infection

    Engineering Websites

    Simon, Scott I.

    Magnetic Nanoparticle Targeted Hyperthermia of Cutaneous Staphylococcus aureus Infection MIN-HO KIM to rapidly heat magnetic nanoparticles that are bound to Staphylococcus aureus (S. aureus). The antimicrobial magnetic field, S. aureus biofilm, Magnetic nanoparticle. INTRODUCTION Staphylococcus aureus (S. aureus

  14. Iron(III)-doped, silica : biodegradable, self-targeting nanoparticles

    University of California eScholarship Repository

    Mitchell, Kristina Kalani Pohaku

    2011-01-01

    nanoparticle based nano drug delivery systems: synthesis,nanoparticle based nano drug delivery systems: synthesis,delivery of drugs, but I don’t get what a nanoparticle really is Self-Assessment Rubric for Scientific Methods & Nano

  15. Concerted action of zinc and ProSAP/Shank in synaptogenesis and synapse maturation

    Biology and Medicine Websites

    Alford, Simon

    EMBO open Concerted action of zinc and ProSAP/Shank in synaptogenesis and synapse maturation the recruitment of ProSAP/Shank proteins to PSDs in a family member-specific manner during the course of zinc-sensitive ProSAP1/ Shank2 or ProSAP2/Shank3 leads to increased synapse density, although all

  16. pH dependence and compartmentalization of zinc transported across plasma membrane of rat cortical neurons

    Biology and Medicine Websites

    pH dependence and compartmentalization of zinc transported across plasma membrane of rat corticalH dependence and compartmental- ization of zinc transported across plasma membrane of rat cortical neurons. Am. 00143.2001.--In this study, Zn2 transport in rat cortical neurons was characterized by successfully

  17. Temperature-Dependent and Bistable Current-Voltage Measurements in Zinc Porphyrin Molecular Junctions

    Chemistry Websites

    Dinolfo, Peter H.

    Temperature-Dependent and Bistable Current-Voltage Measurements in Zinc Porphyrin Molecular related to the fluctuation of the dihedral angle surrounding the zinc and/or the rotation of the porphyrin-voltage characteristics observed. KEYWORDS: temperature dependence, bistability, electromigration, molecular junctions

  18. ORIGINAL PAPER A theoretical study of zinc(II) interactions with amino acid

    Materials Science Websites

    Deymier, Pierre

    ORIGINAL PAPER A theoretical study of zinc(II) interactions with amino acid models and peptide calculations have been employed to study the interaction between the Zn2+ ion and some standard amino acid a square-planar geometry. Keywords Density functional theory Á Zinc Á Amino acids Á Metallization Á Enzymes

  19. Ecotoxicology 2, 68-78 (1994) Zinc, among a `cocktail' of metal pollutants, is

    Environmental Sciences and Ecology Websites

    Hopkin, Steve

    1994-01-01

    Ecotoxicology 2, 68-78 (1994) Zinc, among a `cocktail' of metal pollutants, is responsible) contaminated in the laboratory with arange of concentrations of cadmium, copper, lead or zinc. The metals were by females that matured, and concentra- tions of metals in adult isopods at the end of the experiment were

  20. Unusual molecular ladder structure containing zinc(II) and natural T-shape ligand nitrilotriacetate

    Chemistry Websites

    Gao, Song

    Unusual molecular ladder structure containing zinc(II) and natural T-shape ligand nitrilotriacetate and its structure determined by X-ray diraction analysis, which consists of a ladder running along b axis 2001 Elsevier Science B.V. All rights reserved. Keywords: Ladder; Crystal structure; Zinc

  1. Multilayers of Zinc-Blende Half-Metals with Semiconductors

    CERN Preprints

    Mavropoulos, P; Dederichs, P H; Mavropoulos, Ph.

    2004-01-01

    We report on first-principles calculations of multilayers of zinc-blende half-metallic ferromagnets CrAs and CrSb with III-V and II-VI semiconductors, in the [001] orientation. We examine the ideal and tetragonalised structures, as well as the case of an intermixed interface. We find that, as a rule, half-metallicity can be conserved throughout the heterostructures, provided that the character of the local coordination and bonding is not disturbed. At the interfaces with semiconductors, we describe a mechanism that can give also a non-integer spin moment per interface transition atom, and derive a simple rule to evaluate it.

  2. Copper and Zinc in Bulge-Like Stars

    CERN Preprints

    Pompeia, L

    2003-01-01

    The star formation history of a given population remains imprinted in the chemical distributions of the their individuals. The parallel study of stellar abundances and nucleosynthesis helps to understand the production of the elements inside stars and their evolution in the interestellar medium. In the present paper copper and zinc abundances of a sample of bulge-like stars are inferred and compared to samples of the solar vicinity. A disk-like distribution of [Zn/Fe] is found for the bulge-like stars, while underabundant [Cu/Fe] ratios relative to disk samples are determined.

  3. Copper and Zinc in Bulge-Like Stars

    Astrophysics (arXiv)

    L. Pompeia

    2003-06-02

    The star formation history of a given population remains imprinted in the chemical distributions of the their individuals. The parallel study of stellar abundances and nucleosynthesis helps to understand the production of the elements inside stars and their evolution in the interestellar medium. In the present paper copper and zinc abundances of a sample of bulge-like stars are inferred and compared to samples of the solar vicinity. A disk-like distribution of [Zn/Fe] is found for the bulge-like stars, while underabundant [Cu/Fe] ratios relative to disk samples are determined.

  4. A pair potentials study of matrix-isolated atomic zinc. II. Intersystem crossing in rare-gas clusters and matrices

    Chemistry Websites

    Morse, Michael D.

    A pair potentials study of matrix-isolated atomic zinc. II. Intersystem crossing in rare-isolated atomic zinc is investigated using a pair potentials approach. This is achieved by extending earlier ISC which are the building blocks of the Zn·RG18 cluster used to represent the isolation of atomic zinc

  5. X-ray absorption spectroscopy of the cubic and hexagonal polytypes of zinc sulfide B. Gilbert,1,

    Materials Science Websites

    Gilbert, Pupa Gelsomina De Stasio

    X-ray absorption spectroscopy of the cubic and hexagonal polytypes of zinc sulfide B. Gilbert,1 in the zinc-blende and wurtzite modifications of ZnS. We demon- strate that d-like unoccupied bands investigated as a function of particle size.3 Sphalerite, the cubic zinc blende form of ZnS is stable at room

  6. Ordered ground state wurtzite alloys from zinc-blende parent compounds H. J. Xiang and Su-Huai Wei

    Materials Science Websites

    Gong, Xingao

    Ordered ground state wurtzite alloys from zinc-blende parent compounds H. J. Xiang and Su-Huai Wei that the ground state WZ alloy always has a lower strain energy and formation enthalpy than the corresponding zinc forms: hexagonal wurtzite WZ and cubic zinc- blende ZB structures, which have the same local tetrahedral

  7. A Developmentally Regulated Splice Variant from the Complex lola Locus Encoding Multiple Different Zinc Finger Domain Proteins

    Biology and Medicine Websites

    Johansen, Kristen M

    Zinc Finger Domain Proteins Interacts with the Chromosomal Kinase JIL-1* Received for publication of these each have a dif- ferent zinc finger domain, whereas two are without. This potential for expression, Lola long and Lola short (10). Lola long contains two zinc finger motifs and is a transcription factor

  8. nAture methods | VOL.8 NO.9 | SEPTEMBER2011 | 765 engineered zinc-finger nucleases (ZFns) are promising tools

    Biology and Medicine Websites

    Cai, Long

    Articles nAture methods | VOL.8 NO.9 | SEPTEMBER2011 | 765 engineered zinc-finger nucleases (ZFns contributes to off-target ZFn cleavage and suggest strategies for the improvement of future ZFn design. Zinc monomer consists of a zinc-finger DNA-binding domain fused with a nonspecific FokI restriction

  9. J. Phys. D: Appl. Phys. 29 (1996) 22092215. Printed in the UK Zinc uptake by brain cells: `surface'

    Biology and Medicine Websites

    Gilbert, Pupa Gelsomina De Stasio

    1996-01-01

    J. Phys. D: Appl. Phys. 29 (1996) 2209­2215. Printed in the UK Zinc uptake by brain cells: `surface 1995, in final form 1 February 1996 Abstract. The uptake of zinc by cerebellar rat cultures upon on the surface (cell membrane) is negligible. 1. Introduction We investigated the zinc concentration in different

  10. Low-frequency and resonance magnetoelectric effects in lead zirconate titanate and single-crystal nickel zinc

    Physics Websites

    Srinivasan, Gopalan

    -crystal nickel zinc ferrite bilayers V. Gheevarughese, U. Laletsin, V.M. Petrov, and G. Srinivasana) Physics in lead zirconate titanate (PZT) and (111) or (110) single-crystal nickel zinc ferrites. Data-crystal nickel­ zinc (Ni­Zn) ferrites Ni1-xZnxFe2O4 (NZFO). Use of single crystals is critical

  11. Frameworks of amino acids: synthesis and characterization of two zinc phosphono-amino-carboxylates with extended structures

    Chemistry Websites

    Frameworks of amino acids: synthesis and characterization of two zinc phosphono-aminopropionic and 4-phosphono-2-aminobutyric, are used to link zinc atoms in three-dimensional structures where are the structures and the IR and TGA characteristics of two framework compounds of zinc and phosphonated a

  12. Characteristics of the Interaction of a Synthetic Human Tristetraprolin Tandem Zinc Finger Peptide with AU-rich

    Biology and Medicine Websites

    Zhou, Pei

    Characteristics of the Interaction of a Synthetic Human Tristetraprolin Tandem Zinc Finger Peptide are tandem CCCH zinc finger proteins that can bind to AU-rich elements (AREs) in cellular m that the 70-amino acid tandem zinc finger do- main of TTP is required and sufficient for RNA binding

  13. Ultrafast spin-polarized electrical currents injected in a strained zinc blende semiconductor by single color pulses

    Materials Science Websites

    Van Driel, Henry M.

    Ultrafast spin-polarized electrical currents injected in a strained zinc blende semiconductor we use strain to lower the symmetry of a 110 oriented zinc blende semiconductor and efficiently beams b- c=0, . In bulk zinc blende materials with a point group Td, the tensor vanishes; however

  14. 74 | VOL.8 NO.1 | JANUARY2011 | nAture methods Zinc-finger nucleases (ZFns) drive efficient genome editing

    Chemistry Websites

    Cai, Long

    Articles 74 | VOL.8 NO.1 | JANUARY2011 | nAture methods Zinc-finger nucleases (ZFns) drive for obtaining highly efficient and specific genome modification. Zinc-finger nucleases (ZFNs) are hybrid restriction enzymes composed of a customizable zinc-finger protein DNA-binding domain fused to the cleavage

  15. PHYSICAL REVIEW B 83, 045303 (2011) Direct correlation of crystal structure and optical properties in wurtzite/zinc-blende

    Materials Science Websites

    2011-01-01

    in wurtzite/zinc-blende GaAs nanowire heterostructures Martin Heiss,1,2 Sonia Conesa-Boj,2,3 Jun Ren,4 Hsiang of single GaAs nanowires is reported. Nanowires consisting of 100% wurtzite and nanowires presenting zinc that the regions that are predominantly composed of either zinc-blende or wurtzite phase show photoluminescence

  16. Activation of Methane by Zinc: Gas-Phase Synthesis, Structure, and Bonding of HZnCH3

    Chemistry Websites

    Ziurys, Lucy M.

    Activation of Methane by Zinc: Gas-Phase Synthesis, Structure, and Bonding of HZnCH3 Michael A with hydrogen gas and methane in an AC discharge and the reaction of zinc vapor produced in a Broida-type oven to the zinc atom. From the multiple isotopic substitutions, a precise structure for HZnCH3 has been determined

  17. J. CHEM. soc. DALTON TRANS. 1995 727 Conversion of Hydrogen-bonded Manganese(i1) and Zinc(11)

    Chemistry Websites

    Yaghi, Omar M.

    J. CHEM. soc. DALTON TRANS. 1995 727 Conversion of Hydrogen-bonded Manganese(i1) and Zinc(11-bonding pattern was simplified by substituting, in the zinc analogue, two water molecules with dmso (dmso, extended chains of zinc squarateare present and found to be linked together by hydrogen bonds to form

  18. Full-zone analysis of relativistic spin splitting at band anticrossings: The case of zinc-blende semiconductors

    Physics Websites

    Svane, Axel Torstein

    Full-zone analysis of relativistic spin splitting at band anticrossings: The case of zinc of the hybridization gap. We dem- onstrate these effects in zinc-blende semiconductors with the help of firstAs and other zinc-blende structure materials this degeneracy is lifted by spin-orbit interaction over most

  19. 3072 Inorg. Chem. 1995,34, 3072-3078 Donor Solvent Mediated Reactions of Elemental Zinc and Sulfur, suns Explosion

    Chemistry Websites

    Rauchfuss, Thomas B.

    3072 Inorg. Chem. 1995,34, 3072-3078 Donor Solvent Mediated Reactions of Elemental Zinc and Sulfur, University of Illinois, Urbana, Illinois 61801 Received November 8. 1994@ The reactions of zinc powder of zinc and sulfur powder to give highly pure ZnS (eq 1). This reaction Zn + -ZnS (cubic) AH" = -205.8 k

  20. Supporting information for "Update of mercury emissions from China's primary zinc, lead and copper smelters, 2000-2010"

    Geosciences Websites

    Meskhidze, Nicholas

    1 Supporting information for "Update of mercury emissions from China's primary zinc, lead production from provinces with samples accounted for 94.37%,3 97.50% and 93.17% of the national zinc, lead consumption of imported concentrates. The5 imported zinc concentrate samples were mainly from the United

  1. Department of Biological Sciences, Ohio University, Athens, Ohio, USA Zinc is an essential trace element involved in various

    Biology and Medicine Websites

    Department of Biological Sciences, Ohio University, Athens, Ohio, USA Zinc is an essential trace function in mice prevents accumulation of zinc in synaptic vesicles, which demonstrate that ZnT3 is required for transport of synaptic zinc in the brain (Cole et al. 1999). Other mechanisms of cellular Zn2

  2. Hapticity-Dependent Charge Transport through Carbodithioate-Terminated [5,15-Bis(phenylethynyl)porphinato]zinc(II) Complexes

    Chemistry Websites

    Borguet, Eric

    Hapticity-Dependent Charge Transport through Carbodithioate- Terminated [5,15-Bis(phenylethynyl)porphinato]zinc- and thiol-terminated [5,15- bis(phenylethynyl)-10,20-diarylporphinato]zinc(II) complexes reveal the impact across Au-[5,15-bis(4-(dithiocarboxylate)phenylethynyl)-10,20-diarylporphinato]zinc(II)-Au junctions

  3. Evi3, a zinc-finger protein related to EBFAZ, regulates EBF activity in B-cell leukemia

    Environmental Sciences and Ecology Websites

    Schountz, Tony

    Evi3, a zinc-finger protein related to EBFAZ, regulates EBF activity in B-cell leukemia Kathryn E-cell tumors in the AKXD-27 strain. The Evi3 gene encodes a zinc-finger protein with sequence similarity to the Early B-cell Factor-Associated Zinc-finger gene (EBFAZ). We show that the Evi3 gene is overexpressed

  4. 1038 J.Org. Chem. 1993,58,1038-1047 Addition of Zinc Homoenolates to Acetylenic Esters and Amides: A

    Chemistry Websites

    1038 J.Org. Chem. 1993,58,1038-1047 Addition of Zinc Homoenolates to Acetylenic Esters and Amides-catalyzedconjugateaddition-cycloacylationreactionofzinchomoenolateewithacetylenic estersoracetylenicamidesisdescribed. Thezinchomoenolateispreparedfrom[(ethoxycyclopropy1)- oxyltrimethylsilane and zinc chloride using zinc ho- moenolatese6Sinceanester homoenolateisformallya 1,3 nucleophile-electrophile tandem

  5. Eur. J. Biochem. 151, 333-335 (1985) The amino acid sequences of the copper/zinc superoxide dismutases

    Biotechnology Websites

    1985-01-01

    Eur. J. Biochem. 151, 333-335 (1985) 0FEBS 1985 The amino acid sequences of the copper/zinc) - EJB 85 0299 Recent suggestions that the amino acid sequence of the copper/zinc superoxide dismutases-41, and the investigation of the copper/zinc superoxide dismutase from Photobacter leiognathi by Martin and Fridovich [5

  6. Finite temperature properties for zinc nanoclusters K.L. WU*, S.K. LAI and W.D. LIN

    Materials Science Websites

    Finite temperature properties for zinc nanoclusters K.L. WU*, S.K. LAI and W.D. LIN Complex Liquids between atoms in zinc nanoclusters. From the calculated ground state structures, obtained by Brownian-type molecular dynamic simulation, we investigated the temperature effect of zinc clusters. We studied

  7. Relativistic many-body calculations of the energies of n = 4 states along the zinc isoelectronic sequence

    Physics Websites

    Johnson, Walter R.

    Relativistic many-body calculations of the energies of n = 4 states along the zinc isoelectronic ) states of ions of the zinc isoelectronic se- quence are determined through second order in relativistic approximation (Grant code) was observed to improve with increasing Z [8]. The intercombination lines of the zinc

  8. The Application of Nafion Metal Catalyst Free Carbon Nanotube Modified Gold Electrode: Voltammetric Zinc Detection in Serum

    Engineering Websites

    Papautsky, Ian

    Zinc Detection in Serum Wei Yue,a Adam Bange,b Bill L. Riehl,c Jay M. Johnson,c Ian Papautsky,d William first used as an electrode modification material on a gold electrode surface for zinc voltammetric a mechanically stable sensor. The sensor was then used for zinc de- tection in both acetate buffer solution

  9. Molecular Beam Epitaxial Growth of Zinc-Blende FeN(111) on Wurtzite GaN(0001)

    Materials Science Websites

    Molecular Beam Epitaxial Growth of Zinc-Blende FeN(111) on Wurtzite GaN(0001) Wenzhi Lin, Jeongihm:1 stoichiometry are also very interesting for potential applications. While zinc-blende FeN has not been reported, a theoretical paper has shown the existence of metastable magnetic states in zinc-blende FeN for unit cell

  10. The synthesis, characterization and electroluminescent properties of zinc(II) complexes for single-layer organic light-emitting diodes

    Chemistry Websites

    Li, Jing

    The synthesis, characterization and electroluminescent properties of zinc(II) complexes for single (OLED) 8-Hydroxyquinoline derivative Carbazole derivative Zinc(II) complex a b s t r a c t (E)-2-(2-(9-p)vinyl)-8-hydroxyquinoline and their respective zinc(II) complexes were synthesized and their structures

  11. Determination of the phonon dispersion of zinc blende ,,3C... silicon carbide by inelastic x-ray scattering

    Materials Science Websites

    Weinstein, Benard.A.

    Determination of the phonon dispersion of zinc blende ,,3C... silicon carbide by inelastic x present an experimental and theoretical investigation of the phonon dispersion relations in zinc blende (3 of experimental information available concerns mainly the L direction of zinc blende (3C) SiC, and it has been

  12. Journal of Protein Chemistry, Vol. 15, No. 5, 1996 Splase: A New Class llS Zinc-Finger Restriction

    Biotechnology Websites

    Tsai, Ming-Daw

    Journal of Protein Chemistry, Vol. 15, No. 5, 1996 Splase: A New Class llS Zinc-Finger Restriction by genetically fusing the DNA-cleavage domain of the restriction endonuclease FokI with the zinc-finger DNA to create other restriction enzymes by altering the binding specificity of the zinc-finger recognition helix

  13. Relativistic many-body calculations of the energies of n=4 states along the zinc isoelectronic sequence

    Physics Websites

    Safronova, Marianna

    Relativistic many-body calculations of the energies of n=4 states along the zinc isoelectronic of the 44 even-parity and 40 odd-parity 4l4l states of ions of the zinc isoelectronic sequence to improve with increasing Z 8 . The intercombination lines of the zinc sequence corresponding

  14. Optical properties of wurtzite and zinc-blende GaNAlN quantum dots Vladimir A. Fonoberova)

    Engineering Websites

    Fonoberov, Vladimir

    Optical properties of wurtzite and zinc-blende GaNÕAlN quantum dots Vladimir A. Fonoberova; published 20 August 2004 We investigate theoretically and compare optical properties of wurtzite and zincN/AlN interface governs optical properties of wurtzite quantum dots while having a small effect on zinc

  15. Excitonic properties of strained wurtzite and zinc-blende GaNAlxGa1xN quantum dots

    Engineering Websites

    Fonoberov, Vladimir

    Excitonic properties of strained wurtzite and zinc-blende GaNÕAlxGa1ÀxN quantum dots Vladimir A and zinc-blende ZB crystal structures, as well as strained WZ GaN/AlGaN quantum dots. We show implantation of Ga and N ions into dielectrics.6 More recently, self-organized growth of zinc- blende ZB Ga

  16. Motifs in Protein SequencesMotifs in Protein Sequences Examples: Helix-Turn-Helix, Zinc-finger,

    Computer Technologies and Information Sciences Websites

    Narasimhan, Giri

    Motifs in Protein SequencesMotifs in Protein Sequences Examples: Helix-Turn-Helix, Zinc. Examples: Helix-Turn-Helix, Zinc-finger, Homeobox domain, Hairpin-beta motif, Calcium-binding motif, Beta of the motif M? Example: Zinc Finger Motif ...YYKCCGLCCERSFFVEKSALLSRHHORVHHKN... 3 6 19 23 Input

  17. C2H2 zinc finger-SET histone methyltransferase is a plant-specific chromatin modifier

    Biotechnology Websites

    Citovsky, Vitaly

    C2H2 zinc finger-SET histone methyltransferase is a plant-specific chromatin modifier Alexander thaliana factors, a SWIRM domain polyamine oxidase protein, AtSWP1, and a plant-specific C2H2 zinc finger, a zinc finger protein (You et al., 2001) with still unknown function, histone deacetylases (HDAC), and Co

  18. In Vivo Substitution of Zinc by Cobalt in Carbonic Anhydrase of a Marine Diatom Donald Yee; Francois M. M. Morel

    Environmental Management and Restoration Websites

    Morel, François M. M.

    In Vivo Substitution of Zinc by Cobalt in Carbonic Anhydrase of a Marine Diatom Donald Yee, by the American Society of Limnology and Oceanography, Inc. In vivo substitution of zinc by cobalt in carbonic partially for the zinc requirement of marine diatoms (Price and Morel 1990; Sunda and Huntsman 1995

  19. PHYSICAL REVIEW B 85, 014422 (2012) Extension of the zinc paratacamite phase diagram: Probing the effect of spin vacancies

    Materials Science Websites

    Paris-Sud 11, Université de

    2012-01-01

    PHYSICAL REVIEW B 85, 014422 (2012) Extension of the zinc paratacamite phase diagram: Probing on the extension of the phase diagram of the magnetic model system zinc paratacamite, ZnxCu4-x(OH)6Cl2 (0 x 1. INTRODUCTION The mineral herbertsmithite, the x = 1 member of the zinc paratacamite family ZnxCu4-x(OH)6Cl2

  20. Rmt1 catalyzes zinc-finger independent arginine methylation of ribosomal protein Rps2 in Saccharomyces cerevisiae

    Biology and Medicine Websites

    Clarke, Steven

    Rmt1 catalyzes zinc-finger independent arginine methylation of ribosomal protein Rps2 dimethylarginine residues, the addition of which is catalyzed by zinc-finger-containing arginine methyltransferase (PRMT3) in mammalian cells. Here, we demonstrate that despite the lack of a zinc

  1. Cell, Vol. 115, 603613, November 26, 2003, Copyright 2003 by Cell Press Churchill, a Zinc Finger Transcriptional

    Biology and Medicine Websites

    Stern, Claudio

    Cell, Vol. 115, 603­613, November 26, 2003, Copyright 2003 by Cell Press Churchill, a Zinc Finger, the neural plate is es- This encodes a zinc finger protein that acts as a tran- scriptional activator, yet a zinc finger transcriptional mesoderm (Brachyury and Tbx6L) by FGF, suggesting that at least one of its

  2. Enhancement of the Yield of Photoinduced Charge Separation in Zinc Porphyrin-Quantum Dot Complexes by a Bis(dithiocarbamate)

    Renewable Energy Websites

    Enhancement of the Yield of Photoinduced Charge Separation in Zinc Porphyrin-Quantum Dot Complexes(dithiocarbamate) (PBTC) linker to enhance the quantum yield of photoinduced electron transfer (eT) from a zinc porphyrin describes the enhancement of the quantum yield of electron transfer (eT) from a substituted zinc porphyrin

  3. Zinc binding to the Tyr402 and His402 allotypes of complement factor H: possible implications for age-related

    Biotechnology Websites

    Martin, Andrew C.R.

    1 Zinc binding to the Tyr402 and His402 allotypes of complement factor H: possible implications of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK Running Title: Zinc binding of the alternative pathway of complement activation. High millimolar concentrations of zinc are found in drusen

  4. Structural Analysis of MED-1 Reveals Unexpected Diversity in the Mechanism of DNA Recognition by GATA-type Zinc

    Biology and Medicine Websites

    Maduro, Morris F.

    by GATA-type Zinc Finger Domains*S Received for publication,November 18, 2008, and in revised form of California, Riverside, California 92521 MED-1 is a member of a group of divergent GATA-type zinc finger. Unlike other GATA-type zinc fin- gers that recognize the consensus sequence (A/C/T)GATA(A/ G), the MED-1

  5. From Zinc to Design Model Reza Rafeh, Maria Garcia de la Banda, Kim Marriott, and Mark Wallace

    Computer Technologies and Information Sciences Websites

    Garcia de la Banda, Maria

    From Zinc to Design Model Reza Rafeh, Maria Garcia de la Banda, Kim Marriott, and Mark Wallace.rafeh,mbanda,marriott,wallace}@mail.csse.monash.edu.au Abstract. We describe a preliminary implementation of the high-level modelling language Zinc. This language supports a modelling method- ology in which the same Zinc model can be automatically mapped into different

  6. Mineralogical signature of nonsulfide zinc ores at Accha (Peru): A key for recovery Maria Boni a,b,

    Geosciences Websites

    Boni, Maria

    Mineralogical signature of nonsulfide zinc ores at Accha (Peru): A key for recovery Maria Boni a 14 October 2009 Keywords: Nonsulfide zinc Mineralogy Petrography Processing Flowsheet The Accha and metallurgical characteristics of a nonsulfide Zn orebody has been carried out. The Accha­ Yanque Zinc Belt

  7. Zinc Uptake and Radial Transport in Roots of Arabidopsis thaliana: A Modelling Approach to Understand Accumulation

    CERN Preprints

    Claus, Juliane; Chavarría-Krauser, Andrés

    2012-01-01

    Zinc uptake in roots is believed to be mediated by ZIP (ZRT-, IRT- like Proteins) transporters. Once inside the symplast, zinc is transported to the pericycle, where it exits by means of HMA (Heavy Metal ATPase) transporters. The combination of symplastic transport and spatial separation of influx and efflux produces a pattern in which zinc accumulates in the pericycle. Here, mathematical modelling was employed to study the importance of ZIP regulation, HMA level and symplastic transport in creation of the radial pattern of zinc in primary roots of Arabidopsis thaliana. A comprehensive one-dimensional dynamical model of radial zinc transport in roots was developed and used to conduct simulations. The model accounts for the structure of the root consisting of symplast and apoplast and includes effects of water flow, diffusion, and cross-membrane transport via transporters. It also incorporates the radial geometry and varying porosity of root tissues, as well as regulation of ZIP transporters. Steady state patt...

  8. Fabrication of water-soluble gold nanoparticle aggregates

    MIT - DSpace

    Bennett, Samantha E

    2006-01-01

    Mixed monolayer protected gold nanoparticles were linked using octanedithiol to form aggregates containing hundreds of nanoparticles. These aggregates are an interesting material, posing potential applications in the fields ...

  9. PHD STUDENTSHIP: Superconductivity and switching behaviour in films of nanoparticles

    Mathematics Websites

    Hickman, Mark

    PHD STUDENTSHIP: Superconductivity and switching behaviour in films of nanoparticles While will undertake research into superconductivity and / or switching (memory) behaviour in films of nanoparticles

  10. Fluorescent Multiblock ?-Conjugated Polymer Nanoparticles for In Vivo Tumor Targeting

    MIT - DSpace

    Ahmed, Eilaf

    Highly fluorescent multiblock conjugated polymer nanoparticles with folic acid surface ligands are highly effective for bioimaging and in vivo tumor targeting. The targeted nanoparticles were preferentially localized in ...

  11. Oxide nanomaterials Selbach, Inorganic

    Materials Science Websites

    Oxide nanomaterials Selbach, Inorganic Materials and Ceramics Research Group · Ferroelectrics & mulAferroics · Thermoelectrics · Transparent conducAng oxide · Quantum dotsAvity within ceramic engineering, solid state chemistry, nanoparAcles, thin films

  12. Nanoparticle "theranostic" platforms for applications in cancer

    University of California eScholarship Repository

    Steiner, Jason Michael

    2011-01-01

    Biological Solutions. Nanoparticle/protein interactions areproteins and biomolecules bind and release to the nanoparticlenanoparticle package, typically consisting of a polymer, liposome, or pelleted protein

  13. Microwave enhanced silica encapsulation of magnetic nanoparticles

    University of California eScholarship Repository

    Park, Jeong Chan; Gilbert, Dustin A; Liu, Kai; Louie, Angelique Y.

    2012-01-01

    of organic-based nanoparticles, and can produce particlesorganic ligand-capped nanomaterials including larger sized magnetic cores bearing higher saturation magnetization or optical nano- crystals to produce

  14. 1small 2011, X, No. XX, 15 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim wileyonlinelibrary.com Nanoparticles

    Biology and Medicine Websites

    Wikswo, John

    advances in methods such as magnetic resonance imaging (MRI), computed tomography (CT) imaging, photoacoustic tomography, photothermal optical coherence tomography, and targeted photothermal therapy (PTTOx/Au, or iron oxide/gold core/shell nanoparticles, have been synthesized to utilize both the magnetic relaxivity

  15. Characterization of the natural barriers of intergranular tunnel junctions: Cr2O3 surface layers on CrO2 nanoparticles

    Materials Science Websites

    Diebold, Ulrike

    ; accepted for publication 6 September 2000 Cold-pressed powder compacts of CrO2 show large negative magnetoresistance MR due to intergranular tunneling. Powder compacts made from needle-shaped nanoparticles exhibit thin native oxide layer with a thickness of 1­3 nm on the surface of CrO2 powders has been observed

  16. Chemical Synthesis of Nano-Sized particles of Lead Oxide and their Characterization Studies

    Physics (arXiv)

    M. Alagar; T. Theivasanthi; A. Kubera Raja

    2012-04-04

    The quantum dots of semiconductor display novel and interesting phenomena that have not been in the bulk material. The color tunability is one of the most attractive characteristics in II-VI semiconductor nanoparticles such as CdS, ZnS, CdSe, ZnSe and PbO. In this work, the semiconductor lead oxide nanoparticles are prepared by chemical method. The average particle size, specific surface area, crystallinity index are estimated from XRD analysis. The structural, functional groups and optical characters are analyzed with using of SEM, FTIR and UV- Visible techniques. The optical band gap value has also been determined.

  17. Fundamental limits to nanoparticle extinction

    CERN Preprints

    Miller, Owen D; Reid, M T Homer; Qiu, Wenjun; DeLacy, Brendan G; Joannopoulos, John D; Solja?i?, Marin; Johnson, Steven G

    2013-01-01

    We show that there are shape-independent upper bounds to the extinction cross section per unit volume of randomly oriented nanoparticles, given only material permittivity. Underlying the limits are restrictive sum rules that constrain the distribution of quasistatic eigenvalues. Surprisingly, optimally-designed spheroids, with only a single quasistatic degree of freedom, reach the upper bounds for four permittivity values. Away from these permittivities, we demonstrate computationally-optimized structures that surpass spheroids and approach the fundamental limits.

  18. Evidence for a zinc/proton antiporter in rat brain Robert A. Colvin*, Nancy Davis, R. William Nipper, Philip A. Carter

    Biology and Medicine Websites

    Evidence for a zinc/proton antiporter in rat brain Robert A. Colvin*, Nancy Davis, R. William membrane zinc/proton antiport activity in rat brain. Experiments were performed using puri®ed plasma of cooperativity in zinc activation of 65 Zn2+ uptake. Zinc uptake was inhibited in the presence of 1 mM Ni2+ , Cd2

  19. Design and synthesis of 2-substituted-8-hydroxyquinline zinc complexes with hole-transporting ability for highly effective yellow-light emitters

    Chemistry Websites

    Li, Jing

    Design and synthesis of 2-substituted-8-hydroxyquinline zinc complexes with hole Keywords: 2-Substituted-8-hydroxyquinolate-zinc Yellow-light emitting material Multifunctional material a b-(2-(9-(4-methoxyphenyl)- 9H-carbazol-3-yl)vinyl) quinolato-zinc (1), (E)-2-(2-(9-p-tolyl-9H-carbazol-3-yl)vinyl)quinolato-zinc

  20. Interaction of Nanoparticles with Radiation

    CERN Preprints

    Li, A

    2003-01-01

    Interstellar grains span a wide range of sizes from a few angstroms to a few micrometers. The presence of nanometer-sized or smaller particles in the interstellar medium is indicated directly by the interstellar far ultraviolet (UV) extinction, the ubiquitous 3.3, 6.2, 7.7, 8.6, and 11.3$\\mum$ polycyclic aromatic hydrocarbon (PAH) emission features, the near and mid infrared broadband emission seen in the IRAS 12 and 25$\\mum$ bands and the COBE-DIRBE 3.5, 4.9, 12 and 25$\\mum$ bands, the 10--100$\\GHz$ Galactic foreground microwave emission, and indirectly by the heating of interstellar gas. For nanoparticles under interstellar conditions, UV/visible photon absorption is the dominant excitation process. With a heat capacity smaller than or comparable to the energy of an energetic stellar photon, nanoparticles are subject to single-photon heating, followed by vibrational relaxation, photoionization, and photodestruction. With excited electrons spatially confined, semiconductor nanoparticles are expected to lumin...

  1. Graphene nanosheets-polypyrrole hybrid material as a highly active catalyst support for formic acid electro-oxidation

    Materials Science Websites

    Gao, Hongjun

    by in situ chemical oxidation polymerization. Palladium nanoparticles (NPs) with a diameter of 4.0 nm were. Microstructure analysis showed that a layer of coated PPy film with monodisperse Pd NPs is present on the RGO of Pd/RGO-PPy catalysts may arise from utilization of heterogeneous nucleation sites for NPs

  2. In situ synthesis of metal oxides in carbon nanotube arrays and mechanical properties of the resulting structures

    Physics Websites

    Daraio, Chiara

    integrated with graphitic materials for electrochemical applications. Here, we synthesize nanoparticles of Sn distribution [7], or partially-graphitic layering around individ- ual CNTs [8] affects the bulk mechanical by coating the individual CNT surfaces or filling the interstices of the arrays with metal oxide particles

  3. Adhesion and Atomic Structures of Gold on Ceria Nanostructures: The Role of Surface Structure and Oxidation State of Ceria Supports

    Materials Science Websites

    Marks, Laurence D.

    facet of CeO2 nanostructures can be controlled,13,16 and the atomic surface structures of CeO2 capabilities of CeO2 nanoparticles16 make them one of the most popular oxide supports for Au catalysts.31-35 In addition, different catalytic behaviors have been observed for Au catalysts supported by CeO2 nanorods

  4. Synthesis and photoluminescence of Mn-doped zinc sulfide nanoparticles Dongyeon Son, Dae-Ryong Jung, Jongmin Kim, Taeho Moon,

    Materials Science Websites

    Park, Byungwoo

    , Jongmin Kim, Taeho Moon, Chunjoong Kim, and Byungwoo Parka Department of Materials Science and Engineering was performed to deter- mine the chemical composition of the samples. The UV spectrometer was operated with

  5. Comparison of the Catalytic Oxidation Reaction on Graphene Oxide and Reduced Graphene Oxide

    Computer Technologies and Information Sciences Websites

    Kim, Sehun

    Comparison of the Catalytic Oxidation Reaction on Graphene Oxide and Reduced Graphene Oxide Laboratory (PAL), Pohang 790-784, Republic of Korea ABSTRACT: The capacities of graphene oxide (GO) and reduced graphene oxide (rGO) films grown on silicon substrate to cause the aniline to azobenzene oxidation

  6. Block copolymer/ferroelectric nanoparticle nanocomposites

    Materials Science Websites

    Lin, Zhiqun

    Block copolymer/ferroelectric nanoparticle nanocomposites Xinchang Pang,a Yanjie He,a Beibei Jiang and Zhiqun Lin*a Nanocomposites composed of diblock copolymer/ferroelectric nanoparticles were formed of PS-functionalized BaTiO3 NPs in the PS-b-PMMA/BaTiO3 NP nanocomposites. Selective solvent vapor

  7. Hydrophobic Drug for Nanoparticle Cancer Therapy

    Materials Science Websites

    Petta, Jason

    Hydrophobic Drug for Nanoparticle Cancer Therapy Sarah Ludwig, Dr. Lei Shi, and Dr. Robert Prud'homme 8/3/2011 #12;Background Nanoparticle is composed of... Hydrophobic core that contains Drug portion to travel through the body and hydrophobic portion to stabilize the drug #12;Background: Use

  8. Effective pair potentials for spherical nanoparticles

    Condensed Matter (arXiv)

    Ramses van Zon

    2008-09-22

    An effective description for spherical nanoparticles in a fluid of point particles is presented. The points inside the nanoparticles and the point particles are assumed to interact via spherically symmetric additive pair potentials, while the distribution of points inside the nanoparticles is taken to be spherically symmetric and smooth. The resulting effective pair interactions between a nanoparticle and a point particle, as well as between two nanoparticles, are then given by spherically symmetric potentials. If overlap between particles is allowed, the effective potential generally has non-analytic points, but for each effective potential the expressions for different overlapping cases can be written in terms of one analytic auxiliary potential. Effective potentials for hollow nanoparticles (appropriate e.g. for buckyballs) are also considered, and shown to be related to those for solid nanoparticles. Finally, explicit expressions are given for the effective potentials derived from basic pair potentials of power law and exponential form, as well as from the commonly used London-Van der Waals, Morse, Buckingham, and Lennard-Jones potential. The applicability of the latter is demonstrated by comparison with an atomic description of nanoparticles with an internal face centered cubic structure.

  9. Gold Nanoparticle Silica Nanopeapods Vu Thanh Cong,,

    Computer Technologies and Information Sciences Websites

    Kim, Sehun

    Gold Nanoparticle Silica Nanopeapods Vu Thanh Cong,, Erdene-Ochir Ganbold,§ Joyanta K. Saha gold nanoparticle (AuNP) silica nanotube peapod (SNTP) was fabricated by self-assembly. The geometrical-line nanostructure by controlling the diameters of the AuNPs and the orifice in the silica nanotubes (SNTs). The Au

  10. How to Stabilize Phospholipid Liposomes (Using Nanoparticles)

    Physics Websites

    Granick, Steve

    How to Stabilize Phospholipid Liposomes (Using Nanoparticles) Liangfang Zhang and Steve Granick The simple strategy of mixing phospholipid liposomes with charged nanoparticles and using sonication to mix, protein receptors, and other biosensor molecules can attach to them.1,2 Second, they comprise compartments

  11. POLYMER PROGRAM SEMINAR "Targeted polymeric nanoparticles

    Materials Science Websites

    Alpay, S. Pamir

    for drug delivery applications, including polymeric nanoparticles, dendrimers, nanoshells, liposomes branch of medicine. Polymeric nanoparticles can deliver drugs in the optimum dosage over time, thus increasing the efficacy of the drug, maximizing patient compliance and enhancing the ability to use highly

  12. RESEARCHARTICLE Copyright 2010 American Scientific Publishers

    Materials Science Websites

    North Texas, University of

    and addition of fillers-in particular, ceramic nanoparticles.1­22 There has already been some work on ZnO of Polycarbonate Containing ZnO Nanoparticles: Effects of Sliding Direction María Dolores Bermúdez1 , Witold of injection molded polycarbonate (PC) and polycarbonate + zinc oxide nanocomposites containing 0.5 wt% ZnO

  13. Temperature Effects on Mechanical Properties of Zinc Dithiophosphate Tribofilms

    CERN Preprints

    Demmou, K; Loubet, J L; Martin, J M; Demmou, Karim; Bec, Sandrine; Loubet, Jean-Luc; Martin, Jean-Michel

    2006-01-01

    Nanoindentation tests were performed at several temperatures (24 to 80degC) on one antiwear zinc dialkyl-dithiophosphate (ZDTP) tribofilm using a Nanoindenter XP (R) entirely set into a climatic chamber. Mechanical properties of the tribofilm were determined using a simple model. AFM observations were conducted to estimate the order of magnitude of the film's thickness. The effect of applied pressure on the elastic properties was demonstrated and taken into account in the present analysis. The use of the F/S^2 parameter, independent of contact geometry, revealed a hardness dependency upon temperature. Furthermore, careful AFM observations of the residual pile-up produced by plastic flow around the indents pointed out the evolution of the film deformation process with temperature.

  14. Photonuclear reactions with Zinc: A case for clinical linacs

    CERN Preprints

    Boztosun, I; Karakoç, M; Özmen, S F; Çeçen, Y; Çoban, A; Caner, T; Bayram, E; Saito, T R; Akdo?an, T; Bozkurt, V; Kuçuk, Y; Kaya, D; Harakeh, M N

    2015-01-01

    The use of bremsstrahlung photons produced by a linac to induce photonuclear reactions is wide spread. However, using a clinical linac to produce the photons is a new concept. We aimed to induce photonuclear reactions on zinc isotopes and measure the subsequent transition energies and half-lives. For this purpose, a bremsstrahlung photon beam of 18 MeV endpoint energy produced by the Philips SLI-25 linac has been used. The subsequent decay has been measured with a well-shielded single HPGe detector. The results obtained for transition energies are in good agreement with the literature data and in many cases surpass these in accuracy. For the half-lives, we are in agreement with the literature data, but do not achieve their precision. The obtained accuracy for the transition energies show what is achievable in an experiment such as ours. We demonstrate the usefulness and benefits of employing clinical linacs for nuclear physics experiments.

  15. Photonuclear reactions with Zinc: A case for clinical linacs

    Nuclear Experiment (arXiv)

    I. Boztosun; H. ?apo; M. Karakoç; S. F. Özmen; Y. Çeçen; A. Çoban; T. Caner; E. Bayram; T. R. Saito; T. Akdo?an; V. Bozkurt; Y. Kuçuk; D. Kaya; M. N. Harakeh

    2015-09-14

    The use of bremsstrahlung photons produced by a linac to induce photonuclear reactions is wide spread. However, using a clinical linac to produce the photons is a new concept. We aimed to induce photonuclear reactions on zinc isotopes and measure the subsequent transition energies and half-lives. For this purpose, a bremsstrahlung photon beam of 18 MeV endpoint energy produced by the Philips SLI-25 linac has been used. The subsequent decay has been measured with a well-shielded single HPGe detector. The results obtained for transition energies are in good agreement with the literature data and in many cases surpass these in accuracy. For the half-lives, we are in agreement with the literature data, but do not achieve their precision. The obtained accuracy for the transition energies show what is achievable in an experiment such as ours. We demonstrate the usefulness and benefits of employing clinical linacs for nuclear physics experiments.

  16. Toxicity of Silver, Zinc, Copper, and Nickel to the Copepod Acartia

    Biology and Medicine Websites

    Grosell, Martin

    Toxicity of Silver, Zinc, Copper, and Nickel to the Copepod Acartia tonsa Exposed via researchershavereportedeffectsoninvertebrates(5-9)from dietary metals exposure associated with waterborne metal concentrations at or below

  17. Flexographically Printed Rechargeable Zinc-based Battery for Grid Energy Storage

    University of California eScholarship Repository

    Wang, Zuoqian

    2013-01-01

    based battery based on this specific chemistry works betterBattery Charging………………………………………………………..90 5.5. Chapter Summary and Future Work…………………….work paves the path for potential integration of printable photovoltaic cell, zinc-based battery

  18. A Novel Imaging Approach for Early Detection of Prostate Cancer Based on Endogenous Zinc Sensing

    MIT - DSpace

    Ghosh, Subrata K.

    The early detection of prostate cancer is a life-saving event in patients harboring potentially aggressive disease. With the development of malignancy, there is a dramatic reduction in the zinc content of prostate tissue ...

  19. Relating the biogeochemistries of zinc, cobalt, and phosphorus to phytoplankton activities in the sea

    MIT - DSpace

    Wisniewski, Rachel J. (Rachel Jane), 1978-

    2006-01-01

    This thesis explores the potential of zinc, cobalt, and phosphorus to influence primary production in the subarctic North Pacific, the Bering Sea, and the North Atlantic Ocean. In the North Pacific and Bering Sea, total ...

  20. Understanding Zinc Quantification with Existing and Advanced Ditopic Fluorescent Zinpyr Sensors

    MIT - DSpace

    Buccella, Daniela

    Treatment of aqueous zinc solutions with incremental additions of a ditopic fluorescent sensor of the Zinpyr family, based on pyridine/pyrazine-containing metal recognition units, affords a fluorescence titration curve ...