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Multilayer adsorption with variable thickness at solid-liquid interfaces

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Abstract

The multilayer adsorption on the solid/liquid interface in binary mixtures was studied by adsorption space filling with constant and variable layer thickness. Adsorption from benzene/n-heptane mixtures was examined on hydrophilic and hydro-phobic surfaces. The free enthalpy of adsorption, Δ 21 G=f(x 1), was calculated from the adsorption excess isotherm by integration of the Gibbs equation. Supposing that the free enthalpy is mainly due to adsorption in the first layer, the composition of this layer can be calculated from the Δ 21 G=f(x 1) function. It was established that the adsorption layer thickness in benzene/heptane mixtures increases significantly with increasing benzene content. This statement was supported by X-ray diffraction on hydrophobic clay minerals.

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Authors and Affiliations

  1. Department of Colloid Chemistry, Attila József University, 6720, Szeged, Hungary

    F. Berger & I. Dékány

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  1. F. Berger
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  2. I. Dékány
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Berger, F., Dékány, I. Multilayer adsorption with variable thickness at solid-liquid interfaces. Colloid Polym Sci 275, 876–882 (1997). https://doi.org/10.1007/s003960050160

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  • DOI: https://doi.org/10.1007/s003960050160

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