Transcription of The surface chemistry of amorphous silica. Zhuravlev model
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The surface chemistry of amorphous silica. Zhuravlev model
Colloids and SurfacesA: Physicochemical and Engineering Aspects 173 (2000) 1 38 The surface chemistry of amorphous silica . Zhuravlev ZhuravlevInstitute of Physical chemistry ,Russian Academy of Sciences,Leninsky Prospect31,Moscow117915,RussiaReceived 14 January 1999; accepted 21 February 2000 AbstractA review article is presented of the research results obtained by the author on the properties of amorphous silicasurface. It has been shown that in any description of the surface silica the hydroxylation of the surface is of criticalimportance. An analysis was made of the processes of dehydration (the removal of physically adsorbed water),dehydroxylation (the removal of silanol groups from the silica surface ), and rehydroxylation (the restoration of thehydroxyl covering). For each of these processes a probable mechanism is suggested. The results of experimental andtheoretical studies permitted to construct the original model ( Zhuravlev model -1 and model -2) for describing thesurface chemistry of amorphous silica .
formed in the course of silica synthesis, e.g. during the condensation polymerization of Si(OH) 4 (Fig. 1a). Here, the supersaturated solution of the acid becomes converted into its polymeric form, which then changes into spherical colloidal particles con-taining Si OH groups on the surface. Upon drying, the hydrogel yields xerogel, the final
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