Effect of HCl in a two-step sol-gel process using TEOS

被引：13

作者：

Huang, WL ^{[1
]}

Liang, KM ^{[1
]}

Gu, SR ^{[1
]}

机构：

[1] Tsing Hua Univ, Dept Mat Sci & Engn, Div Met, Beijing 100084, Peoples R China

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1999年 / 258卷 / 1-3期

关键词：

D O I：

10.1016/S0022-3093(99)00551-7

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper introduces and investigates a new two-step method by further addition of acid in the basic step. By this method high R-w (molar ratio of water/TEOS) systems (R-w reaches 250)can be gelled without volume loss. Below the coagulation point, a larger amount of HCl addition in the basic step (the system remains basic) and higher ultimate base concentration lead to faster gelation, which might be attributed to the change of electrolyte concentration, ion strength and pH value of the system, while a larger amount of water causes longer gelation times due to dilution effects. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：234 / 238

页数：5

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