金属多孔球形银粉的制备

Fabrication of Sphericity Nanoporous Metal Silver Powders

摘要:

采用化学还原沉积法，以水合联氨为还原剂，在分散剂和自制的有机混和溶剂的保护下，控制溶液中银离子浓度为10~40 g.L-1，分散剂的加入量1.5~3 g.L-1，有机混合制剂60 g.L-1，还原反应在瞬间完成，还原出粒度为纳米级的银颗粒，在可控的条件下纳米颗粒聚集为多孔团粒银粉，快速从溶液中沉淀分离。采用扫描电镜检测，多孔团粒球体的粒度为40~80 μm; 采用比表面积及孔隙度检测仪测试比表面积可以达到16 m2/g以上，其孔道具有很高的通透性，不同于常规的超细银粉

Abstract:

The fabrication method of sphericity nanoporous metal silver powders by nanosilver powders is described in the present paper. In this technique, a chemical deoxidize deposited way is used by taking N2H4.H2O as deoxidizer, the nanosilver powders are prepared by deoxidized silver ions which are protected by the dispersant and the home-made organic mixed solution. The silver ions concentration, the dispersant adding amount, and the organic mixed preparation are 10~40 g/L, 1.5~3 g/L, and 60 g/L, respectively, in the solution, then the reduction reaction is finished instantly with a nanosilver granularity of 10~20 nm. The nanosilver powders are conglomerated to sphericity nanoporous silver powders under controllable conditions, fast separated from the solution by deposited. The morphology was studied using a JEOL JSM-6400 FESEM, the results show that the sphericity nanoporous silver powders granularity is 40 ~80 μm. The specific surface area of the nanoporous silver powders is more than 16 m2/g measured using a Micromeritics ASAP 2020, and its pore channel has a very high penetration, different from the traditional microminiature silver powders.