Neue Modifikationen des Siliciumdioxids / New Modifications of Silica

Author:

Lagaly Gerhard1,Beneke Klaus1,Kammermeier Haymo1

Affiliation:

1. Institut für anorganische Chemie der Universität Kiel, Olshausenstraße 40/60, D-2300 Kiel

Abstract

Abstract A new family of modifications of silica is obtained by thermal dehydration of crystalline silicic acids with layer structures. Examples are SiO2 · 0.11 H2O, SiO2 · 0.04 H2O, SiO2 prepared by dehydration of H2Si14O29 · 5.4 H2O, H2Si8O17 · xH2O and H2Si4O9. The “water content” can amount up to 3 weight percent and results from uncondensed inter-layer silanol groups or from water molecules which are trapped between the layers. In some cases dehydration in the presence of organic interlayer molecules leads to different forms of silica.

Publisher

Walter de Gruyter GmbH

Subject

General Chemistry

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