Facile Synthesis of Flake Copper Powder Loaded With Silver Particles

2011 ◽  
Vol 109 ◽  
pp. 91-95
Author(s):  
Xiao Feng Tian ◽  
Wei Ke Zhang
Keyword(s):  
Copper Powder ◽  
Composite Particle ◽  
Copper Particle ◽  
Composite Particles ◽  
Silver Particles ◽  
Facile Synthesis ◽  
Wet Chemistry ◽  
Dispersing Agent ◽  
Copper Composite ◽  
Individual Particles

A fast and facile wet chemistry method has been developed for preparing monodispersed silver coated copper composite particles. Copper powder is coated using a solution containing [Ag (NH3)] +. The effect of the copper particle size distribution, the concentrations of [Ag (NH3)] + on composite particles conductivity were investigated. The composite particle with electric conductivity of 0.8×10-3 Ω•cm is obtained at 0.8 mol/L of Ag+ and1.0 g/L of dispersing agent. Copper powder loaded with silver particles morphologies range from individual particles to small islands, to the continuous multi-layers structure with Ag+ concentration increases.

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.

Preparation of Flake Silver Coated over Copper Powder

2011 ◽  
Vol 412 ◽  
pp. 251-254 ◽  
Author(s):  
Xiao Yun Zhu ◽  
Man Dong ◽  
Xu Xiao Yi
Keyword(s):  
Particle Size ◽  
Electric Conductivity ◽  
Copper Powder ◽  
Silver Content ◽  
Copper Particle ◽  
Small Islands ◽  
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 Effective Interactions of Relativistic Composite Particles in Unified Nonlinear Spinor-Field Models. I

1985 ◽  
Vol 40 (1) ◽  
pp. 14-28
Author(s):  
H. Stumpf
Keyword(s):  
Spinor Field ◽  
Bound States ◽  
Composite Particle ◽  
Composite Particles ◽  
Statistical Interpretation ◽  
Particle Spectrum ◽  
Nonlinear Spinor ◽  
Effective Interactions ◽  
Scattering States ◽  
Diagonal Part

Unified nonlinear spinor field models are selfregularizing quantum field theories in which all observable (elementary and non-elementary) particles are assumed to be bound states of fermionic preon fields. Due to their large masses the preons themselves are confined. In preceding papers a functional energy representation, the statistical interpretation and the dynamical equations were derived. In this paper the dynamics of composite particles is discussed. The composite particles are defined to be eigensolutions of the diagonal part of the energy representation. Corresponding calculations are in preparation, but in the present paper a suitable composite particle spectrum is assumed. It consists of preon-antipreon boson states and threepreon- fermion states with corresponding antifermions and contains bound states as well as preon scattering states. The state functional is expanded in terms of these composite particle states with inclusion of preon scattering states. The transformation of the functional energy representation of the spinor field into composite particle functional operators produces a hierarchy of effective interactions at the composite particle level, the leading terms of which are identical with the functional energy representation of a phenomenological boson-fermion coupling theory. This representation is valid as long as the processes are assumed to be below the energetic threshold for preon production or preon break-up reactions, respectively. From this it can be concluded that below the threshold the effective interactions of composite particles in a unified spinor field model lead to phenomenological coupling theories which depend in their properties on the bound state spectrum of the self-regularizing spinor theory.

Facile synthesis of spongy micro-copper powder with excellent oxidation resistance by controlled ethanol-water thermal reduction

2020 ◽  
Vol 823 ◽  
pp. 153746
Author(s):  
Xiaoping Chen ◽  
Yuansong Wei ◽  
Min Fan ◽  
Shunnan Huang ◽  
Bohong Chen ◽  
...  
Keyword(s):  
Oxidation Resistance ◽  
Copper Powder ◽  
Thermal Reduction ◽  
Facile Synthesis

Numerical Simulations of Electric Field Driven Self-Assembly of Monolayers of Mixtures of Nanoparticles

2017 ◽  
Author(s):  
E. Amah ◽  
N. Musunuri ◽  
Ian S. Fischer ◽  
Pushpendra Singh
Keyword(s):  
Electric Field ◽  
Physical Properties ◽  
Numerical Simulations ◽  
Self Assembly ◽  
Composite Particle ◽  
Critical Value ◽  
Direct Numerical Simulations ◽  
Composite Particles ◽  
Liquid Interfaces ◽  
Induced Dipole

We numerically study the process of self-assembly of particle mixtures on fluid-liquid interfaces when an electric field is applied in the direction normal to the interface. The force law for the dependence of the electric field induced dipole-dipole and capillary forces on the distance between the particles and their physical properties obtained in an earlier study by performing direct numerical simulations is used for conducting simulations. The inter-particle forces cause mixtures of nanoparticles to self-assemble into molecular-like hierarchical arrangements consisting of composite particles which are organized in a pattern. However, there is a critical electric intensity value below which particles move under the influence of Brownian forces and do not self-assemble. Above the critical value, when the particles sizes differed by a factor of two or more, the composite particle has a larger particle at its core and several smaller particles forming a ring around it. Approximately same sized particles, when their concentrations are approximately equal, form binary particles or chains (analogous to polymeric molecules) in which positively and negatively polarized particles alternate, but when their concentrations differ the particles whose concentration is larger form rings around the particles with smaller concentration.

Pickering emulsion polymerized poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/polystyrene composite particles and their electric stimuli-response

RSC Advances ◽  
2015 ◽  
Vol 5 (88) ◽  
pp. 72387-72393 ◽  
Author(s):  
So Hee Kim ◽  
Jung Hyun Kim ◽  
Hyoung Jin Choi ◽  
Jaehoon Park
Keyword(s):  
Pickering Emulsion ◽  
Composite Particles ◽  
Facile Synthesis ◽  
Stimuli Response

We report a facile synthesis of Pickering emulsion polymerized poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/polystyrene composite particles and their electrorheology.

Facile Synthesis of Polyaniline-Silver Composites through Interfacial Polymerization

2013 ◽  
Vol 686 ◽  
pp. 86-91 ◽  
Author(s):  
Ahmad Abdolahi ◽  
Esah Hamzah ◽  
Zaharah Ibrahim ◽  
Shahrir Hashim
Keyword(s):  
Room Temperature ◽  
Interfacial Polymerization ◽  
Shell Shape ◽  
Silver Particles ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
Ammonium Persulphate ◽  
X Ray ◽  
Silver Composites

In this paper, the simple synthesis of polyaniline/silver composites through interfacial polymer method was studied. Polyaniline-silver composites were produced at room temperature by using ammonium persulphate as an oxidant agent in presence of silver nitrate (AgNO3). Field Emission Scanning Electron Microscopy (FESEM), X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR) techniques were used to characterize the synthesized product. FESEM results showed the core shell shape of composites that the layer of polyaniline covered the silver particles. XRD results showed the high crystalline behaviour of the polyaniline/silver composites due to presence of silver. FTIR results also showed the successfully synthesis of the composite. This paper aims to study on synthesis and characterization of polyaniline-silver composites.

Sign in / Sign up

Export Citation Format

Share Document