| In this research, copper-nickel alloy micro-sphere particles were first prepared via liquid-phase reduction by hydrazine hydrate as a reducing agent. The synthesis conditions and the tests of performance on the alloy micro spheres have been systematically studied. Based on these studies, Cu-Ni/PANI composites were prepared by in-situ synthesis and emulsion polymerization, and effect of conduction on the conductivity were investigated including the dosage of emulsifiers, polymerization temperature, reaction time and content of alloy. Moreover, the relation between its structures and properties has been discussed.Through the liquid-phase reduction method, a face-centered cubic structure of copper-nickel alloy micro spheres were successfully synthesized by hydrazine hydrate as the reducing agent, with an average diameter of 200nm. The detailed analysis of the synthesis conditions shows that the reduction takes place in alkaline environment and low-temperature is propitious to generate alloy solid-solution grain. Meanwhile, it is conducive to inhibit the growth of grain and is helpful to prevent the reunification of dispersing particles by using a small amount of PVP as a modifier. Alloy micro-spheres were proved to be super-paramagnetic which can be made into soft magnetic materials used for absorbing wave materials, magnetic fluids, etc and in alkaline solution of glucose alloy micro-spheres have good function of electro-catalytic oxidation. The cyclic voltammetry has showed that alloy possesses higher activity of redox than simple substance of Cu or Ni, and the electron transfer of Cu-Ni/GCE is mainly a surface-controlled quasi-reversible process.Composites prepared by emulsion polymerization in acidic aqueous solutions synthesis of polyaniline shows higher conductivity than pure polymer, due to the strong interaction between alloy particles and doping PANI. The conductivity of composites dependents within a certain range of alloys, reached maximum 39.0 S/cm. |
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