Control of the growth processes of the silica sols colloidal particles

被引：12

作者：

Hayrapetyan, SS ^{[1
]}

Khachatryan, HG ^{[1
]}

机构：

[1] Yerevan State Univ, Dept Chem, Yerevan 375025, Armenia

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2005年 / 78卷 / 2-3期

关键词：

seed formation; colloidal particles' growth; silica; pore size distribution; BET method;

D O I：

10.1016/j.micromeso.2004.10.011

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Solubility of the silica depends mainly on medium pH values. Owing to this pH factor becomes definitive when carrying processes connected with the silica dissolving. The growth of the silica colloidal particles during the obtaining stabilized silica sots is one of such processes. The influence of other factors on the silica solubility in the SiO2-H2O system is not so essential. A possibility to control the growth of the silica colloidal particles during the preparation of the stabilized silica sots by means of regulating medium pH values has been studied. Seed formation processes are decisive when obtaining silica sots and silica gels with beforehand requested characteristics. It is necessary to realize growth processes in the meta-stable range of the SiO-H2O system (pH 8.5-9.5) to obtain silica sots with reproducible particle sizes. Influence of the pre-history of obtained stabilized silica sots on porous characteristics of silica gels prepared on their base has been studied. For evaluation of the quality of these sots porous characteristics of the silica gels have been determined by means of BET method. Pore size distribution has been also determined for the obtained silica gels. (C) 2004 Elsevier Inc. All rights reserved.

引用

页码：151 / 157

页数：7

共 15 条

[1]

Bechtold MF, 1951, U.S. Patent, Patent No. 2574902

[2]

Bird PG, 1941, U.S. Patent, Patent No. [2,244,325, 2244325]

[3] Preparation and characterization of polypyrrole-silica colloidal nanocomposites in water-methanol mixtures [J].

Han, MG ;

Armes, SP .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2003, 262 (02) :418-427

[4]

Iler RK, 1979, CHEM SILICA SOLUBILI, DOI DOI 10.1002/ANGE.19800920433

[5] Preparation of colloidal silica from sodium metasilicate solution and sulphuric acid in emulsion medium [J].

Jesionowski, T .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2001, 190 (1-2) :153-165

[6] Properties of poly(N-isopropylacrylamide)-grafted colloidal silica [J].

Liu, J ;

Pelton, R ;

Hrymak, AN .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2000, 227 (02) :408-411

[7] Preparation and thermal properties of epoxy-silica nanocomposites from nanoscale colloidal silica [J].

Liu, YL ;

Hsu, CY ;

Wei, WL ;

Jeng, RJ .

POLYMER, 2003, 44 (18) :5159-5167

[8] Adsorption and stability of colloidal silica [J].

Schwarz, S ;

Lunkwitz, K ;

Kessler, B ;

Spiegler, U ;

Killmann, E ;

Jaeger, W .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2000, 163 (01) :17-27

[9] Surface chemistry and trimethylsilyl functionalization of Stober silica sols [J].

Suratwala, TI ;

Hanna, ML ;

Miller, EL ;

Whitman, PK ;

Thomas, IM ;

Ehrmann, PR ;

Maxwell, RS ;

Burnham, AK .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2003, 316 (2-3) :349-363

[10] The study of formation colloidal silica via sodium silicate [J].

Tsai, MS .

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2004, 106 (01) :52-55

← 1 2 →