Abstract
Model porous adsorbent gels (silica, ceria) composed of regular packings of spherical oxide sol particles have been prepared. The pore size in the gels was controlled by the diameter of the sol particles. The mechanisms of adsorption and capillary condensation of water in the gels was investigated by small angle neutron scattering using H 2 O/D 2 O mixtures which had a composition which gave a contrast match with the solid oxide. Behaviour of mesoporous silicas is in accord with previous theoretical models based on multilayer and capillary condensation whereas for microporous ceria there is clear evidence of a volume filling mechanism where the sorbed water has a density significantly less than in the bulk.
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