Abstract

According to ideas which have been developed, the centers determining the adsorption and chemosorption activity of the surface of silica are the structural hydroxyl groups and the silicon atoms to which they are attached [i, 2]. The isolated silanol groups of the Si02 surface can be regarded as fairly convenient isolated centers for the study of intermolecular and chemical interactions. For the pyrogenic silica-aerosils most frequently used in spectroscopic studies, it is extremely important to know whether the silanol groups are arranged in uniform fashion, or whether appreciable fluctuations are observed in their density as a consequence of disorder among the tetrahedra of the surface. We suggest that the chemical method provides a promising means of solving this problem, which is difficult for the case of amorphous silicas.

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