期刊
CERAMICS INTERNATIONAL
卷 32, 期 6, 页码 691-699出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2005.05.004
关键词
monodispersed; nanosilica; anion electrolytes; conductivity
Anion electrolyte additives (ammonium salts) have been used for the first time to study the effect on the morphology development of nanometer, monodispersed silica particles by the sol-gel process. The phenomena can be explained by conductivity profile during the process as alternative to normally use zeta potential. Under experimental conditions where TEOS, water, EtOH and feed rate were fixed and without additives, unstable silica particles of similar to 30 nm were formed at a ratio of TEOS/NH3 >= 0.6, below that particles from 90 to 250 nm were obtained. However, upon the addition of small amount of anion electrolytes, monodispersed nanosilica powders with particles ranging from similar to 20 to similar to 34 nm were obtained depending on the type and concentration of anions added. It was found that all anions were able to reduce the particle size by 73-78%, among them, Br- and I- have the highest effect while Cl- has the least effect. The synthesized silica powder was free from cation impurities. (C) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据