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 sols is one of such processes. The influence of other factors on the silica solubility in the SiO 2 -H 2 O system is not so essential.
A possibility to control the growth of the silica colloidal particles during the preparation of the stabilized silica sols by means of regulating medium pH values has been studied. Seed formation processes are decisive when obtaining silica sols and silica gels with beforehand requested characteristics. It is necessary to realize growth processes in the meta-stable range of the SiO 2 -H 2 O system (pH 8.5-9.5) to obtain silica sols with reproducible particle sizes.
Influence of the pre-history of obtained stabilized silica sols on porous characteristics of silica gels prepared on their base has been studied. For evaluation of the quality of these sols 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.