Gelation of aluminosilicate systems under different chemical conditions

K. Sinkó, R. Mezei, M. Zrínyi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Optically clear aluminosilicate gels of different chemical compositions (0-0.9 mole ratios of total Al/(Si + Al)) were prepared directly from solutions of inorganic aluminum salts, tetraethoxysilane, water and alcohol without the time-consuming sol forming. However, in these gels only 0-75% of total Al content was incorporated by chemical bonding into the gel network depending on the compositions of gels and the preparation conditions. The incorporation of aluminum atoms into the gel framework and the structure of wet gels were investigated by chemical analysis, 27Al magic angle spinning nuclear magnetic resonance, and small angle X-ray scattering. The present method may be most favourable for the preparation of aluminosilicate gels with 0.30-0.70 mole ratios of total Al/(Si + Al). At lower Al content acidic catalysis is required. Above 0.70 mole ratio homogeneous gels cannot be obtained by this method. The highest aluminum incorporation in homogeneous gel structures of various mole ratios of total Al/(Si + Al) was 0.53 mole ratio of bonded Al/(Si + Al) in contradiction to 0.1 mole ratio of Al/(Si + Al) achieved by traditional melting process of glass.

Original languageEnglish
Pages (from-to)147-156
Number of pages10
JournalJournal of Sol-Gel Science and Technology
Volume21
Issue number3
DOIs
Publication statusPublished - Aug 2001

Fingerprint

Aluminosilicates
gelation
Gelation
Gels
gels
Aluminum
aluminum
Chemical analysis
aluminosilicate
preparation
Magic angle spinning
Polymethyl Methacrylate
Sols
X ray scattering
chemical analysis
metal spinning
Catalysis
catalysis
chemical composition
Melting

Keywords

  • Al(NO)
  • Aluminosilicate gel
  • Hydrolysis
  • Sol-gel

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Gelation of aluminosilicate systems under different chemical conditions. / Sinkó, K.; Mezei, R.; Zrínyi, M.

In: Journal of Sol-Gel Science and Technology, Vol. 21, No. 3, 08.2001, p. 147-156.

Research output: Contribution to journalArticle

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