Dielectric behaviour of cyclohexane and benzene sorbed on a microporous silica gel

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Abstract
Sorption isotherms have been determined for nitrogen (–195°), cyclohexane (25°) and benzene (25°) on a commercial silica gel. From their analysis, in addition to a pore system of 19 Å mean radius, micropores existed, which were penetrated by nitrogen and benzene molecules but not by cyclohexane molecules. From a nitrogen t plot it was estimated that micropores of width in vacuo the micropore system was diminished, causing a decrease in the sorption of benzene, although not of nitrogen. The benzene dielectric isotherm again showed an initial linear region of lower slope than the second, but the “break” occurred at a lower (micropore) volume than with the unheated gel. A third linear region was detected, of lower slope than the second, this break occurring at the start of irreversible capillary condensation which was more pronounced in the calcined gel.

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