Synthesis and Characterization of Silver-Coated Copper Powder Layer

2012 ◽  
Vol 512-515 ◽  
pp. 141-146
Author(s):  
Xiao Yun Zhu ◽  
Lie Hu ◽  
Man Dong
Keyword(s):  
Copper Powder ◽  
Silver Content ◽  
Chemical Reduction ◽  
Surface Topology ◽  
Powder Layer ◽  
Silver Coating ◽  
Complete Coverage ◽  
Thermal Analyser ◽  
Differential Thermal Analyser

This paper presents the process of preparing spherical silver-coated copper powder with a silver content of 30-50%, using chemical reduction and by adjusting the silver-coating process. By means of SEM, XRD, grain size analyser, digital ohmmeter and differential thermal analyser, the surface topology, structure and conductivity of silver-coated copper powder and raw copper powder are characterised. The results show that the spherical silver-coated copper powder has superior compact surface, complete coverage, a coated layer reaching a thickness of 336nm and excellent conductivity and anti-oxidation property.

Study of Preparation on the Flake Silver Coating over Copper Powder for Electronic Industry

2011 ◽  
Vol 275 ◽  
pp. 165-169
Author(s):  
Xiao Yun Zhu ◽  
Man Dong
Keyword(s):  
Electric Conductivity ◽  
Copper Powder ◽  
Silver Content ◽  
Copper Particle ◽  
Silver Coating ◽  
Electronic Industry ◽  
Dispersing Agent ◽  
Intermediate Phases ◽  
Xrd Patterns ◽  
Individual Particles

Flake copper powder is coated with silver by using a solution containing [Ag(NH3)]+. Factors such as copper particle size distribution, [Ag(NH3)]+ concentrations and the dispersing agent are studied and correlated with the silver content of coated copper and electric conductivity. At the condition of silver concentration of 0.8 mol/L and dispersing agent of 1.0g/L a powder of copper coated with silver with electric conductivity of 0.8×10-3Ω•cm is obtained. XRD patterns indicate that the powder consists of only the Cu and Ag phases without other intermediate phases. SEM results with different silver contents reveal that when Ag content rises, its surface topography transforms through the steps: individual particles →small islands→continuous 2D layers →multi-layers.

scholarly journals SYNTHESIS AND CHARACTERIZATION OF COMPLEX DIAQUADIHYDANTOIN NICKEL(II) SULFAT MONOHIDRAT)

2016 ◽  
Vol 10 (2) ◽  
pp. 137
Author(s):  
Sentot Budi Rahardjo ◽  
Surya Dewi Marliyana ◽  
Nur Asih Siwi Wulandari
Keyword(s):  
Thermal Analysis ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Functional Group ◽  
Synthesis And Characterization ◽  
Infra Red ◽  
Thermal Analyser ◽  
Differential Thermal Analyser

<p>The purpose of the research is to find out the synthesis, formula and characteristic of complex of Nickel(II) with hydantoin (hyd). Complex of nickel(II) with  hydantoin  have been synthesized in 1 : 1 mole ratio of metal to ligan in methanol.The formula of  complex which are predicted from analysis of % Ni in complex by Atomic Absorption Spectroscopy (AAS) is Ni(hyd)<sub>2</sub>(H<sub>2</sub>O)<sub>3</sub>.SO<sub>4</sub>.  Ratio  of  cation  and  anion  of  complex  is  measured  by conductivitymeter  correspond to 1: 1.  The thermal analysis  is determined  by Differential Thermal  Analyser  (DTA)  indicate  that  complex  contain  some  hydrate,  thus  possibility formula  of  complex  is  [Ni(hyd)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]SO<sub>4</sub>.H<sub>2</sub>O (Diaquadihydantoinnikel(II) sulfat monohidrat).  Data  of  infra  red  spectra  show  a  shift  of  N-H  group  and  tertier  N  group 138 absorption  and  indicate  this  functional  group  coordinated  to  the  center  ion.  Magnetic Suscepbility measurement show that the complex is paramagnetic with μ<sub>eff</sub>  = 3.2  BM. The UV-Vis spectra appear do to 2 transition peak on  λ  =  740 nm (13,513 cm<sup>-1</sup>) and  405 nm (24,691 cm<sup>-1</sup>).  The peak indicate that structure of complex is octahedral with transition <sup>3</sup>A<sub>2g</sub>→ <sup>3</sup>T<sub>1g</sub>(P)(ν<sub>2</sub>) andtransition <sup>3</sup>A<sub>2g</sub>  → <sup>3</sup>T<sub>1g</sub>(F)(ν<sub>3</sub>). One peak which  is  not appear is transition <sup>3</sup>A<sub>2g</sub> → <sup>3</sup>T<sub>2g</sub> (F)(ν<sub>1</sub>) which also estimate of 10 Dq (Δ<sub>0</sub>) is 103.615 kJ mol<sup>-1</sup>.</p>

scholarly journals SYNTHESIS AND CHARACTERIZATION OF COMPLEX DIAQUADIHYDANTOIN NICKEL(II) SULFAT MONOHIDRAT)

2016 ◽  
Vol 10 (2) ◽  
pp. 137
Author(s):  
Sentot Budi Rahardjo ◽  
Surya Dewi Marliyana ◽  
Nur Asih Siwi Wulandari
Keyword(s):  
Thermal Analysis ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Functional Group ◽  
Synthesis And Characterization ◽  
Infra Red ◽  
Thermal Analyser ◽  
Differential Thermal Analyser

<p>The purpose of the research is to find out the synthesis, formula and characteristic of complex of Nickel(II) with hydantoin (hyd). Complex of nickel(II) with  hydantoin  have been synthesized in 1 : 1 mole ratio of metal to ligan in methanol.The formula of  complex which are predicted from analysis of % Ni in complex by Atomic Absorption Spectroscopy (AAS) is Ni(hyd)<sub>2</sub>(H<sub>2</sub>O)<sub>3</sub>.SO<sub>4</sub>.  Ratio  of  cation  and  anion  of  complex  is  measured  by conductivitymeter  correspond to 1: 1.  The thermal analysis  is determined  by Differential Thermal  Analyser  (DTA)  indicate  that  complex  contain  some  hydrate,  thus  possibility formula  of  complex  is  [Ni(hyd)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]SO<sub>4</sub>.H<sub>2</sub>O (Diaquadihydantoinnikel(II) sulfat monohidrat).  Data  of  infra  red  spectra  show  a  shift  of  N-H  group  and  tertier  N  group 138 absorption  and  indicate  this  functional  group  coordinated  to  the  center  ion.  Magnetic Suscepbility measurement show that the complex is paramagnetic with μ<sub>eff</sub>  = 3.2  BM. The UV-Vis spectra appear do to 2 transition peak on  λ  =  740 nm (13,513 cm<sup>-1</sup>) and  405 nm (24,691 cm<sup>-1</sup>).  The peak indicate that structure of complex is octahedral with transition <sup>3</sup>A<sub>2g</sub>→ <sup>3</sup>T<sub>1g</sub>(P)(ν<sub>2</sub>) andtransition <sup>3</sup>A<sub>2g</sub>  → <sup>3</sup>T<sub>1g</sub>(F)(ν<sub>3</sub>). One peak which  is  not appear is transition <sup>3</sup>A<sub>2g</sub> → <sup>3</sup>T<sub>2g</sub> (F)(ν<sub>1</sub>) which also estimate of 10 Dq (Δ<sub>0</sub>) is 103.615 kJ mol<sup>-1</sup>.</p>

Fabrication and capillary characterization of multi-scale micro-grooved wicks with sintered copper powder

2021 ◽  
Vol 121 ◽  
pp. 105123
Author(s):  
Qifan Li ◽  
Zhong Lan ◽  
Jiang Chun ◽  
Shijun Lian ◽  
Rongfu Wen ◽  
...  
Keyword(s):  
Copper Powder ◽  
Multi Scale ◽  
Sintered Copper

scholarly journals A Review on the Catalytic Hydrogenation of Bromate in Water Phase

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 365
Author(s):  
Jose Luis Cerrillo ◽  
Antonio Eduardo Palomares
Keyword(s):  
Catalytic Activity ◽  
Ion Exchange ◽  
Reaction Mechanisms ◽  
Catalytic Reduction ◽  
Environmental Concern ◽  
Chemical Reduction ◽  
Catalyst Stability ◽  
Polluted Water ◽  
Water Composition

The presence of bromate in water sources generates environmental concern due to its toxicity for humans. Diverse technologies, like membranes, ion exchange, chemical reduction, etc., can be employed to treat bromate-polluted water but they produce waste that must be treated. An alternative to these technologies can be the catalytic reduction of bromate to bromide using hydrogen as a reducing agent. In this review, we analyze the research published about this catalytic technology. Specifically, we summarize and discuss about the state of knowledge related to (1) the different metals used as catalysts for the reaction; (2) the influence of the support on the catalytic activity; (3) the characterization of the catalysts; (4) the reaction mechanisms; and (5) the influence of the water composition in the catalytic activity and in the catalyst stability. Based on published papers, we analyze the strength and weaknesses of this technique and the possibilities of using this reaction for the treatment of bromate-polluted water as a sustainable process.

Fabrication and characterization of ultra-thin vapour chambers with printed copper powder wick

2021 ◽  
pp. 117734
Author(s):  
Zhaoshu Chen ◽  
Yong Li ◽  
Jiu Yu ◽  
Liqiang Deng ◽  
Hanyin Chen ◽  
...  
Keyword(s):  
Copper Powder ◽  
Fabrication And Characterization

scholarly journals Characterization of Intramolecular Disulfide Bonds and Secondary Modifications of the Glycoprotein from Viral Hemorrhagic Septicemia Virus, a Fish Rhabdovirus

1998 ◽  
Vol 72 (12) ◽  
pp. 10189-10196 ◽  
Author(s):  
Katja Einer-Jensen ◽  
Thomas N. Krogh ◽  
Peter Roepstorff ◽  
Niels Lorenzen
Keyword(s):  
G Protein ◽  
Disulfide Bonds ◽  
Chemical Reduction ◽  
Viral Hemorrhagic Septicemia Virus ◽  
Spectrometric Analysis ◽  
Glycan Structure ◽  
Viral Hemorrhagic Septicemia ◽  
Transmembrane Glycoprotein ◽  
Before And After

ABSTRACT Viral hemorrhagic septicemia virus (VHSV) infections cause high losses in cultured rainbow trout in Europe. Attempts to produce a recombinant vaccine based on the transmembrane glycoprotein (G protein) have indicated that proper folding is important for the antigenicity and immunogenicity of the protein. The present study was initiated to identify the disulfide bonds and other structural aspects relevant to vaccine design. The N-terminal amino acid residue was identified as being a pyroglutamic acid, corresponding to Gln21 of the primary transcript. Peptides from endoproteinase-degraded G protein were analyzed by mass spectrometry before and after chemical reduction, and six disulfide bonds were identified: Cys29-Cys339, Cys44-Cys295, Cys90-Cys132, Cys172-Cys177, Cys195-Cys265, and Cys231-Cys236. Mass spectrometric analysis in combination with glycosidases allowed characterization of the glycan structure of the G protein. Three of four predicted N-linked oligosaccharides were found to be predominantly biantennary complex-type structures. Furthermore, an O-linked glycan near the N terminus was identified. Alignment of the VHSV G protein with five other rhabdovirus G proteins indicates that eight cysteine residues are situated at conserved positions. This finding suggests that there might be some common disulfide bonding pattern among the six rhabdoviruses.

Preparation and characterization of silver nanoparticles by chemical reduction method

2011 ◽  
Vol 82 (2) ◽  
pp. 513-517 ◽  
Author(s):  
Zaheer Khan ◽  
Shaeel Ahmed Al-Thabaiti ◽  
Abdullah Yousif Obaid ◽  
A.O. Al-Youbi
Keyword(s):  
Silver Nanoparticles ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Chemical Reduction Method
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