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Citation: Liang Huan-Zhen, Kim Dong-Jin, Chung Hun S., Zhang Jie, Yu Ke-Ning, Li Shao-Hua, Li Rui-Xing. Mechanism for the Formation of Flake Silver Powder Synthesized by Chemical Reduction in Ethylene Glycol[J]. Acta Physico-Chimica Sinica, ;2003, 19(02): 150-153. doi: 10.3866/PKU.WHXB20030212 shu

Mechanism for the Formation of Flake Silver Powder Synthesized by Chemical Reduction in Ethylene Glycol

1.
Institute of Process Engineering, Chinese Academy of Sciences, Beijing　100080;Korea Institute of Geoscience and Mineral Resources, Korea 305-350;China University of Geosciences, Beijing　100083

Received Date: 1 April 2002
Available Online: 15 February 2003

The chemical reduction process has been used for the synthesis of silver powder in ethylene glycol. The mechanism for the formation of flake powder has been proposed on the basis of analysis of the main factors influencing the morphology of silver powder. The results showed that the key factor for the formation of flake silver powder was the heterogeneous seeds of platinum firstly reduced. It offered a plane for precipitation and reduction of silver later. The concentration of free silver ion was controlled by polyvinyl pyrrolidone (PVP) by the formation of complex. And more PVP was absorbed on the surface of silver ion selectively. Thus the nucleation and growth of silver was influenced and flake silver powder formed.
- Flake silver;Ethylene glycol;Wet chemistry;Synthesizing;Polyvinyl pyrrolidone (PVP)
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