Studies of the pore structures of silica gels by electron microscopy and low-temperature nitrogen adsorption

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Abstract
The pore structures of a number of silica gels have been examined by low-temperature (−196 °C) nitrogen adsorption isotherms and these data compared with information obtained from electron photomicrographs. Good general agreement was obtained in the comparison, although the electron photomicrographs reveal more details regarding pore arrangements and dimensional variations. Gel structures were modified by heating and also by treatments with superheated steam or nitric acid. The aggregation of ultimate particles is affected by the steam treatment and this phenomena is compared with the preliminary stages of accepted sintering mechanisms.

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