5 research outputs found

    Adsorption and capillarity

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    Applied Science

    Condensation enthalpies of n-hexane in micelle-templated mesoporous silicas

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    International audienceThe isosteric enthalpies of adsorption of n-hexane on ordered mesoporous silica of pore diameter between 3 and 10 nm have been measured. The heat of capillary condensation increases when mesopores are smaller. Capillary condensation of n-hexane in 3 nm mesopores is 20 % more exothermic than the condensation on a flat liquid surface. The results are in good agreement with a model which takes into account the energetic contribution of the interface between the adsorbed layer and the vapour phas
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