Investigation of 1800–1400 cm–1 region of infra-red spectrum of aerosil silicas

Abstract

Measurements have been made of the integrated absorption intensity of the deformation band of molecular water adsorbed on Aerosil silicas. The results show that the amount of molecular water remaining adsorbed on the surface of these powders after evacuation at room temperature corresponds to a surface coverage of less than 0.1 µmole/m². Also, if self-supporting pressed discs are made from an Aerosil powder containing adsorbed molecular water then an appreciable fraction of this adsorbed material is retained by the disc after evacuation at room temperature.