Enthalpy and entropy effects in adsorption and displacement

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Abstract

A detailed thermodynamic analysis of the system aqueous n-butanol solution/graphitised Printex showed, that the displacement of water by n-butanol at the carbon surface is an enthalpy-driven process up to monolayer coverage of the alcohol, but becomes an entropy-driven process in the polymolecular adsorption region. The adsorption, however, is an enthalpy-driven process in both the mono- and multilayer regimes. The dramatic difference between the adsorption and displacement processes is attributed to a dilution effect (hydrophobic dehydration) in the bulk solution.

Original languageEnglish
Pages (from-to)95-101
Number of pages7
JournalColloids and Surfaces
Volume49
Issue numberC
DOIs
Publication statusPublished - 1990

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ASJC Scopus subject areas

  • Engineering(all)

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