Investigation of the systems silica and silica containing chromium in alcohol medium

被引：13

作者：

Godoi, RHM ^{[1
]}

Fernandes, L ^{[1
]}

Jafelicci, M ^{[1
]}

Marques, RC ^{[1
]}

Varanda, LC ^{[1
]}

Davolos, MR ^{[1
]}

机构：

[1] UNESP, Sao Paulo State Univ, Inst Chem, BR-14801970 Araraquara, SP, Brazil

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 1999年 / 247卷

基金：

巴西圣保罗研究基金会;

关键词：

D O I：

10.1016/S0022-3093(99)00052-6

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：

The purpose of this work is to obtain micrometer sized spherical particles of silica and silica-chromium from sodium silicate. Spherical particles were prepared by sol-gel method from hydrolysis to polycondensation of aqueous sodium silicate in alcohol medium. Chromium was added to the system for some samples. Compositions and morphologies were achieved by changing the precipitation agent. X-ray diffractometry, electrophoretic mobility, infrared spectroscopy and scanning electron microscopies were carried out on these particles to identify phases, determine particle mobility, morphology, particle sizes, shapes and order at short distance. Non-crystalline silica particles with spherical shapes and micrometric size were obtained. The surface potentials of the silica particles differed from that of the silica-chromium particles. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：141 / 145

页数：5

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