skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Double dumbbell shaped AgNi alloy by pulsed electrodeposition

Abstract

Silver-Nickel is the well-known thermally immiscible system that makes them quite complex for the formation of alloy. This kind of alloy can be attained from electrodeposition method. In the present work, AgNi alloy was synthesized by pulsed electrodeposition in a single bath two electrode system with the use of anodic alumina membrane. The prepared AgNi alloy and pure Ag were characterized with X-ray Diffraction (XRD) for structural confirmation, Scanning Electron Microscopy (SEM) for morphological, and magnetic properties by Vibrating Sample Magnetometer, respectively. The X-ray Diffraction study shows the formation of cubic structure for pure Ag. SEM analysis reveals the double dumbbell morphology for AgNi alloy and spherically agglomeration for pure silver. Hysteresis behaviour from VSM measurement indicates that the AgNi alloy have good ferro-magnetic properties.

Authors:
; ;  [1]; ;  [2]
  1. Materials Science Centre, Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai 600 025 (India)
  2. Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai-600 025 (India)
Publication Date:
OSTI Identifier:
22264034
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1576; Journal Issue: 1; Conference: OMTAT 2013: 2. international conference on optoelectronic materials and thin films for advanced technology, Kochi, Kerala (India), 3-5 Jan 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; AGGLOMERATION; ALLOYS; ALUMINIUM OXIDES; ELECTRODEPOSITION; MAGNETIC PROPERTIES; MEMBRANES; NICKEL; PULSES; SCANNING ELECTRON MICROSCOPY; SILVER; VIBRATING SAMPLE MAGNETOMETERS; X-RAY DIFFRACTION

Citation Formats

Dhanapal, K., Vasumathi, M., Santhi, Kalavathy, Narayanan, V., E-mail: stephen-arum@hotmail.com, and Stephen, A., E-mail: stephen-arum@hotmail.com. Double dumbbell shaped AgNi alloy by pulsed electrodeposition. United States: N. p., 2014. Web. doi:10.1063/1.4861991.
Dhanapal, K., Vasumathi, M., Santhi, Kalavathy, Narayanan, V., E-mail: stephen-arum@hotmail.com, & Stephen, A., E-mail: stephen-arum@hotmail.com. Double dumbbell shaped AgNi alloy by pulsed electrodeposition. United States. doi:10.1063/1.4861991.
Dhanapal, K., Vasumathi, M., Santhi, Kalavathy, Narayanan, V., E-mail: stephen-arum@hotmail.com, and Stephen, A., E-mail: stephen-arum@hotmail.com. 2014. "Double dumbbell shaped AgNi alloy by pulsed electrodeposition". United States. doi:10.1063/1.4861991.
@article{osti_22264034,
title = {Double dumbbell shaped AgNi alloy by pulsed electrodeposition},
author = {Dhanapal, K. and Vasumathi, M. and Santhi, Kalavathy and Narayanan, V., E-mail: stephen-arum@hotmail.com and Stephen, A., E-mail: stephen-arum@hotmail.com},
abstractNote = {Silver-Nickel is the well-known thermally immiscible system that makes them quite complex for the formation of alloy. This kind of alloy can be attained from electrodeposition method. In the present work, AgNi alloy was synthesized by pulsed electrodeposition in a single bath two electrode system with the use of anodic alumina membrane. The prepared AgNi alloy and pure Ag were characterized with X-ray Diffraction (XRD) for structural confirmation, Scanning Electron Microscopy (SEM) for morphological, and magnetic properties by Vibrating Sample Magnetometer, respectively. The X-ray Diffraction study shows the formation of cubic structure for pure Ag. SEM analysis reveals the double dumbbell morphology for AgNi alloy and spherically agglomeration for pure silver. Hysteresis behaviour from VSM measurement indicates that the AgNi alloy have good ferro-magnetic properties.},
doi = {10.1063/1.4861991},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1576,
place = {United States},
year = 2014,
month = 1
}
  • The authors report the first calorimetric and spectroscopic investigation on a member of a new class of nucleic acid secondary structures in which both ends of a duplex core are closely by single-stranded loops. Such structures can be formed intramolecularly from appropriately designed base sequences. They have synthesized a 24-mer sequence, and they present calorimetric, spectroscopic, and electrophoretic evidence that it adopts a dumbbell-shaped, double-hairpin structure. Their data allow them to reach the following conclusions: (1) the phosphodiester gap in the center of the core duplex of the dumbbell does not reduce the transition enthalpy relative to that measured formore » the corresponding octameric duplex d(GGAATTCC)/sub 2/; (2) incorporation of a 5'-phosphate group into the gap decreases the thermal stability of the dumbbell relative to its unphosphorylated sequence; (3) the thymine residues in the loop behave both electrostatically and enthalpically like denatured single strands. Published nuclear magnetic resonance studies reveal partial stacking of thymine residues in the loops of linear hairpin structures; (4) when both ends of the nicked octameric core duplex are constrained by loops of only four thymine residues, the dumbbell structure may adopt conformations in which the 5' and 3' ends at the nick are twisted relative to the helical axis and therefore are not in phase. Such conformations would account for the observed resistance of the double-hairpin structure of ligation, since the 3'OH and 5'P would no longer be collinear.« less
  • The structures of three possible C[sub 60] dimers with intact cages have been calculated at the semiempirical (MNDO/AM-1, PM-3) and ab initio density functional theory (DFT) levels. At the DFT level, both local (LDFT) and nonlocal (NLDFT) calculations have been performed. The dimers are formed by the 1,2-, 1,4-, and 1,2+1,4-cycloadditions of a cyclohexatrienyl unit of each C[sub 60]. The energies of the dimers relative to that of the most stable 1,2-C[sub 60] dimer are 74.0 kcal/mol (AM-1), 75.2 kcal/mol (PM-3), 69.7 kcal/mol (LDFT), and 76.2 kcal/mol (NLDFT) for the 1.4-C[sub 60] dimer and 93.0 kcal/mol (AM-1), 87.0 kcal/mol (PM-3),more » 69.8 kcal/mol (LDFT), and 69.5 kcal/mol (NLDFT) for the 1,2+1,4-C[sub 60] dimer. The dimerization reaction to form the C[sub 60] dimers from C[sub 60] is calculated to be weakly endothermic only for the formation of 1,2-(C[sub 60])[sub 2], and for the others, the reaction is predicted to be strongly endothermic. This result suggests that 1,2-cycloaddition is the most plausible scheme for the dimerization and polymerization of C[sub 60] molecules, if the cages remain intact. 47 refs., 4 figs., 8 tabs.« less
  • A 60-year-old woman presented with a conglomerate pulmonary arteriovenous malformation (PAVM) size 8.2 Multiplication-Sign 7.2 cm on chest X-ray. Feeding arteries were A{sub a}{sup 7} and A{sub b}{sup 7}, A{sup 8}, and A{sup 10}. The diameter and length of the A{sub b}{sup 7} neck were 15.5 and 16 mm, respectively. After percutaneous transcatheter embolization of A{sup 8} and A{sup 10}, PTE of A{sub a}{sup 7} and A{sub b}{sup 7} was conducted under balloon occlusion with interlocking detachable coils using a technique of dumbbell-shaped framing and filling, making a bridge from A{sub b}{sup 7} to the trunk of A{sup 9} andmore » A{sup 10}across A{sup 7}. Follow-up computed tomography 10 months after treatment showed marked shrinkage of the PAVM.« less
  • The initial stages of the electrodeposition of nickel, zinc, and nickel-zinc alloy were investigated by nucleation analysis. A novel deconvolution technique was applied to obtain the individual chronoamperometry of each species and elucidate the nucleation and growth mechanisms of nickel-zinc alloy deposition. In agreement with earlier conclusions (part 1 of this study), codeposition of hydrogen and nickel occurs in the initial stage of deposition. Adsorption and evolution of hydrogen are significant and cause the enhancement of nickel content. From the deconvoluted chronamperograms of nickel-zinc deposition, one sees that the nucleation and growth mechanism of the alloy is similar to thatmore » of the pure metals (i.e., nickel or zinc). This similarity implies a weak interaction between nickel and zinc nuclei in the initial stages of deposition.« less
  • A single-mode Al/sub x/Ga/sub 1-x/As/GaAs laser of excellent performance was made by metalorganic chemical vapor deposition. The laser has a double heterostructure with a small V-shaped active region of a self-aligned junction stripe geometrically grown on a groove-etched substrate. The self-aligning process was based on a newly found anomalous zinc diffusion phenomenon. The minimum threshold current and the maximum differential quantum efficiency in continuous operation were 15 mA and 65% for a 250-..mu..m-long device. The output power up to 40 mW was attained with an Si/sub 3/N/sub 4/ coated device. The beam shape from the laser was nearly circular withmore » an aspect ratio less than 1.5.« less