Nanosize silver particles have been prepared by reduction of aqueous solution of agno3 in the presence of polyvinylpyrrolidone , ethanol and de - ionized water , hydrazine hydrate was used for the reduction 摘要采用聚乙烯吡咯烷酮、无水乙醇和去离子水混合溶液，利用水合肼还原硝酸银制备纳米银粒子。
2.
Friends union enterprises tianjin ltd . , which was registered in tianjin free trade zone , is specializing in manufacturing and marketing thiocyanate salts and polyvinylpyrrolidone series in domestic and overseas market 新联谊天津国际工贸有限公司为天津保税区注册的外贸公司，集生产新品开发和销售为一体的化工产品的生产商和供应商。
3.
Friends union enterprises ( tianjin ) ltd . , which was registered in tianjin free trade zone , is specializing in manufacturing and marketing thiocyanate salts and polyvinylpyrrolidone series in domestic and overseas market 新联谊（天津）国际工贸有限公司为天津保税区注册的外贸公司，集生产、新品开发和销售为一体的化工产品的生产商和供应商。
4.
Monodisperse ( coefficient of variation 5 % ) polystyrene microspheres in the size range of 1 . 0 ~ 10 m are prepared by dispersion polymerization in ethyl alcohol reaction media using polyvinylpyrrolidone ( pvp ) as a steric stabilizer and 2 , 2 ' - azobisizobutyronitrile ( aibn ) as an initiator in suitable condition 摘要以聚乙烯吡咯烷酮为分散剂、无水乙醇为反应介质、偶氮二异丁腈为引发剂，采用分散聚合的方法，通过优化反应条件，成功制备出了粒径范围为1 ~ 10 m不同粒径级别的单分散（分散系数5 % ）聚苯乙烯微球。
