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Title: Evaluation of hybrid sol-gel incorporated with nanoparticles as nano paint

Abstract

A coating with self-cleaning characteristics has been developed using a TiO{sub 2}/SiO{sub 2} hybrid sol-gel, TiO{sub 2} nanoparticles and organosilicate nanoparticles (OSNP). A patented technology of the hybrid sol-gel and OSNP was combined with TiO{sub 2} nanoparticles to create the surface chemistry for self-cleaning. Two synthesis methods have been developed to prepare TiO{sub 2} nanoparticles (NPs), resulting in the enhancement of local paint by the addition of anatase and rutile TiO{sub 2} phases. The NPs size as determined by Dynamic Light Scattering (DLS) ranges within of (3-4) and (20-42) nm, which was also confirmed by Scanning Electron Microscopy (SEM). The nanoparticles showed surface charge (zeta-potential, ζ) of +35 and +25.62 mV for the methods, respectively, and ζ values of +41.31 and 34.02 mV for anatase and rutile phases, respectively. The NPs were mixed with the coating solution (i.e., hybrid sol-gel and OSNP) in different concentrations and thin films were prepared by spin coating. Self-cleaning tests were performed using Rhodamine B (RhB) as a pollution indicator. The effect of UV-irradiation on the films was also studied. Anatase and rutile incorporated as a mixture with different ratios in local paint and washability as well as a contrast ratio tests were performed. Itmore » was found that the addition of TiO{sub 2} NPs in combination with irradiation show a great enhancement of RhB degradation (1%) wt. with a decrease in contact angle and improved washability.« less

Authors:
;  [1];  [2]; ;  [3]
  1. Nanotechnology and Advanced Materials Research Center, The University of Technology, Baghdad (Iraq)
  2. College of Science for Women, University of Baghdad, Baghdad (Iraq)
  3. Department of Electrical and Computer, University of Missouri, Engineering, Building West, Columbia, Missouri 65211 (United States)
Publication Date:
OSTI Identifier:
22608451
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1758; Journal Issue: 1; Conference: TMREES2016: Conference on technologies and materials for renewable energy, environment and sustainability, Beirut (Lebanon), 15-18 Apr 2016; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ABUNDANCE; CONCENTRATION RATIO; IRRADIATION; LIGHT SCATTERING; NANOPARTICLES; RHODAMINES; SCANNING ELECTRON MICROSCOPY; SILICA; SILICON OXIDES; SOL-GEL PROCESS; SPIN; SPIN-ON COATING; SURFACES; SYNTHESIS; THIN FILMS; TITANIUM OXIDES

Citation Formats

Jameel, Zainab N., E-mail: zeinb76-alrekbe@yahoo.com, Haider, Adawiya J., E-mail: adawiyahaider@yahoo.com, Taha, Samar Y., E-mail: samarjam2002@yahoo.com, Gangopadhyay, Shubhra, E-mail: gangopadhyays@missouri.edu, and Bok, Sangho, E-mail: BokSa@missouri.edu. Evaluation of hybrid sol-gel incorporated with nanoparticles as nano paint. United States: N. p., 2016. Web. doi:10.1063/1.4959377.
Jameel, Zainab N., E-mail: zeinb76-alrekbe@yahoo.com, Haider, Adawiya J., E-mail: adawiyahaider@yahoo.com, Taha, Samar Y., E-mail: samarjam2002@yahoo.com, Gangopadhyay, Shubhra, E-mail: gangopadhyays@missouri.edu, & Bok, Sangho, E-mail: BokSa@missouri.edu. Evaluation of hybrid sol-gel incorporated with nanoparticles as nano paint. United States. doi:10.1063/1.4959377.
Jameel, Zainab N., E-mail: zeinb76-alrekbe@yahoo.com, Haider, Adawiya J., E-mail: adawiyahaider@yahoo.com, Taha, Samar Y., E-mail: samarjam2002@yahoo.com, Gangopadhyay, Shubhra, E-mail: gangopadhyays@missouri.edu, and Bok, Sangho, E-mail: BokSa@missouri.edu. Mon . "Evaluation of hybrid sol-gel incorporated with nanoparticles as nano paint". United States. doi:10.1063/1.4959377.
@article{osti_22608451,
title = {Evaluation of hybrid sol-gel incorporated with nanoparticles as nano paint},
author = {Jameel, Zainab N., E-mail: zeinb76-alrekbe@yahoo.com and Haider, Adawiya J., E-mail: adawiyahaider@yahoo.com and Taha, Samar Y., E-mail: samarjam2002@yahoo.com and Gangopadhyay, Shubhra, E-mail: gangopadhyays@missouri.edu and Bok, Sangho, E-mail: BokSa@missouri.edu},
abstractNote = {A coating with self-cleaning characteristics has been developed using a TiO{sub 2}/SiO{sub 2} hybrid sol-gel, TiO{sub 2} nanoparticles and organosilicate nanoparticles (OSNP). A patented technology of the hybrid sol-gel and OSNP was combined with TiO{sub 2} nanoparticles to create the surface chemistry for self-cleaning. Two synthesis methods have been developed to prepare TiO{sub 2} nanoparticles (NPs), resulting in the enhancement of local paint by the addition of anatase and rutile TiO{sub 2} phases. The NPs size as determined by Dynamic Light Scattering (DLS) ranges within of (3-4) and (20-42) nm, which was also confirmed by Scanning Electron Microscopy (SEM). The nanoparticles showed surface charge (zeta-potential, ζ) of +35 and +25.62 mV for the methods, respectively, and ζ values of +41.31 and 34.02 mV for anatase and rutile phases, respectively. The NPs were mixed with the coating solution (i.e., hybrid sol-gel and OSNP) in different concentrations and thin films were prepared by spin coating. Self-cleaning tests were performed using Rhodamine B (RhB) as a pollution indicator. The effect of UV-irradiation on the films was also studied. Anatase and rutile incorporated as a mixture with different ratios in local paint and washability as well as a contrast ratio tests were performed. It was found that the addition of TiO{sub 2} NPs in combination with irradiation show a great enhancement of RhB degradation (1%) wt. with a decrease in contact angle and improved washability.},
doi = {10.1063/1.4959377},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1758,
place = {United States},
year = {Mon Jul 25 00:00:00 EDT 2016},
month = {Mon Jul 25 00:00:00 EDT 2016}
}
  • Composite materials prepared by the incorporation of terbium bipyridyl complex into hybrid-type matrices, containing inorganic and organic oligomers, so-called ORMOSIL, were prepared by the sol-gel method and their luminescence property was studied. The resulting ORMOSIL: Tb(bpy){sub 2}{sup 3+} composite materials provided a strong green emission which was intensified upon elevating the temperature. In particular, the same emission intensity value as that of the LaPO{sub 4}:Ce, Tb was observed for a composite material with 10 mole percent (m/o) of the complex, ORMOSIL:Tb(bpy){sub 2}{sup 3+} (10 m/o), after heating at 150 C in air.
  • The crystallization behavior and stoichiometric changes of barium titanium alkoxide-derived monolithic gels prepared by the sol-gel process using a high-concentration Ba,Ti precursor solution (0.8 mol/L) were investigated during aging at room temperature. Crystallization of the gels (which were amorphous, per X-ray diffraction analysis immediately after gelation) into the BaTiO{sub 3} perovskite phase increased during aging and was associated with significant shrinkage of the gels. Crystallization reached a value of {approximately}82% by the final stage of shrinkage, assuming the degree of crystallization of a gel treated at 600 C to be 100%. The stoichiometry of the gels (Ba/Ti molar ratio) alsomore » changed considerably during aging, as estimated by the concentrations of Ba and Ti that remained in the expelled liquid resulting from syneresis at any time during the aging process. Deviation in the Ba/Ti ratio of the precursor solution ranged from 0.015 at the initial stage of shrinkage to 0.003 at the final stage, a value determined by inductively coupled plasma atomic emission spectroscopy. The present study demonstrates the great advantage of using high-concentration precursor solutions of barium titanium alkoxides, rather than low-concentration solutions, to obtain BaTiO{sub 3} gel monoliths with high density and crystallinity and little stoichiometric deviation, by sol-gel processing at room temperature.« less
  • Nano-sized particles of spinel LiMn{sub 2}O{sub 4} and LiCr{sub x}Mn{sub 2-x}O{sub 4} (x = Cr; 0.00-0.40) have been synthesized using phthalic acid as chelating agent for the first time by sol-gel method. When compared to solid-state synthesis method, the sol-gel route reduces heating time of synthesize and to obtain particles of uniform surface morphology. The synthesized samples were characterized through thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). SEM images of the parent compounds show nanospherical grains of LiMn{sub 2}O{sub 4} when compared to chromium-doped ones. XRD patterns of LiMn{sub 2}O{sub 4} ascertainmore » amorphous nature and for high calcined LiCr{sub x}Mn{sub 2-x}O{sub 4} single phase highly crystalline patterns were obtained. TEM images of the parent and chromium-doped spinel particles depict individual grain morphology with well-separated grain boundaries. LiCr{sub 0.10}Mn{sub 1.90}O{sub 4} excels in discharge and cycling behaviour and offer higher columbic efficiency, when compared to un-doped LiMn{sub 2}O{sub 4}. Cyclic voltammograms of LiMn{sub 2}O{sub 4} and LiCr{sub x}Mn{sub 2-x}O{sub 4} exhibit oxidation and reduction peaks corresponding to Mn{sup 3+}/Mn{sup 4+} and Cr{sup 3+}/Cr{sup 4+}.« less
  • Hydroxyapatite (HAP) ceramics have been recognized as substitute materials for bone and teeth in orthopedic and dentistry field due to their chemical and biological similarity to human hard tissue. The nanosized and nanocrystalline forms of HAP have great potential to revolutionize the hard tissue-engineering field, starting from bone repair and augmentation to controlled drug delivery systems. This paper reports the synthesis of biomimetic nano-hydroxyapatite (HAP) by sol-gel method using calcium nitrate tetrahydrate (CNT) and potassium dihydrogen phosphate (KDP) as calcium and phosphorus precursors, respectively to obtain a desired Ca/P ratio of 1.67. Deionized water was used as a diluting mediamore » for HAP sol preparation and ammonia was used to adjust the pH to 11. After aging, the HAP gel was dried at 55 deg. C and sintered to different temperatures (200 deg. C, 400 deg. C, 600 deg. C, 800 deg. C, 1000 deg. C and 1200 deg. C). The dried and sintered powders were characterized for phase composition using Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). The particle size and morphology was studied using transmission electron microscopy (TEM). The thermal behavior of the dried HAP nanopowder was studied in the temperature range of 55 deg. C to 1000 deg. C using thermal gravimetric analyser (TGA). The BET surface area of absorbance was determined by Nitrogen adsorption using Brunauer-Emmett-Teller (BET) method. The presence of characteristic peaks of the phosphate and OH groups in FTIR spectrums confirmed the formation of pure HAP in dried as well as sintered powders. XRD results also confirmed the formation of stoichiometric nano-HAP. Sintering revealed that with increase in temperature, both the crystallinity and crystallite size of nano-HAP particles increased. The synthesized nano-HAP powder was found to be stable upto 1000 deg. C without any additional phase other than HAP, whereas peak of {beta}-TCP (tricalcium phosphate) was observed at 1200 deg. C. Photomicrograph of TEM showed that the nanopowder sintered at 600 deg. C is composed of hydroxyapatite nanoparticles (26.0-45.6 nm), which is well in agreement with the crystallite size calculated using XRD data. TGA study showed the thermal stability of the synthesized nano-HAP powder. The BET surface area decreased with increase in sintering temperature.« less
  • Graphical abstract: Synthesis of nano rod shaped neodymium phosphate particles with specific surface area as high as 107 m{sup 2} g{sup -1} and particles could be compacted and sintered at as low as 1300 Degree-Sign C to a density of 98.5% (theoretical) with an average grain size of {approx}1 {mu}m. Highlights: Black-Right-Pointing-Pointer Nano size neodymium phosphate is synthesized and characterized using a novel modified aqueous sol gel process. Black-Right-Pointing-Pointer Specific surface area above 100 m{sup 2} g{sup -1} achieved without the addition of any complexing agents. Black-Right-Pointing-Pointer High sintered density reported than the density obtained for powder synthesized through conventionalmore » solid state reaction. Black-Right-Pointing-Pointer The particles are nano sized and have rod shape morphology and are retained at higher temperatures. Black-Right-Pointing-Pointer An average grain size of {approx}1 {mu}m obtained for sintered NdPO{sub 4} after thermal etching at 1400 Degree-Sign C. -- Abstract: Synthesis of nano rod shaped neodymium phosphate (NdPO{sub 4}) particles with specific surface area as high as 107 m{sup 2}g{sup -1} and an average length of 50 nm with aspect ratio 5 was achieved using modified sol gel method. Crystallite size calculated from the X-ray diffraction data by applying Scherer equation was 5 nm for the precursor gel after calcination at 400 Degree-Sign C. NdPO{sub 4} was first precipitated from neodymium nitrate solution using phosphoric acid followed by peptization using dilute nitric acid and further gelation in ammonia atmosphere. The calcined gel powders were further characterized by surface area (Brunauer-Emmet-Teller nitrogen adsorption analysis), Transmission electron microscopy, scanning electron microscopy, UV-vis and FT-IR analysis. Transmission electron microscopy confirms the formation of rod like morphology from the sol, gel and the calcined particles in nano size range. These particles could be compacted and sintered at as low as 1300 Degree-Sign C to a density of 98.5% (theoretical) with an average grain size of {approx}1 {mu}m.« less