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 hydrophobic surfaces. The free enthalpy of adsorption, Δ21G = f(x1), 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 Δ21G = f(x1) 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.

Original languageEnglish
Pages (from-to)876-882
Number of pages7
JournalColloid and Polymer Science
Volume275
Issue number9
DOIs
Publication statusPublished - Sep 1997

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Keywords

  • Adsorption
  • Adsorption capacity
  • Binary mixtures
  • Free enthalpy of adsorption
  • Layer thickness
  • Multilayers
  • Surface layer composition

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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