Microcalorimetric studies of S/L interfacial layers: Thermodynamic parameters of the adsorption of butanol-water on hydrophobized clay minerals

I. Regdon, Z. Király, I. Dékány, G. Lagaly

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19 Citations (Scopus)

Abstract

Interaction of hydrophobized surfaces with mixtures of water and organic solvents is important in many practical applications. Alkylammonium clay minerals are excellent models for studying such processes. An example is the adsorption of n-butanol-water on vermiculite primed with dodecyl-, octadedcyl- and dodecyldiammonium ions. The thermodynamic functions Δ21 Gs, Δ21Hs, Δ21 Ss for the adsorption of butanol from water at the interfaces were obtained from the reduced specific surface excess values and the calorimetric heat of displacement. They reveal the strong influence of the alkyl chain length. Two contributions are important: the enthalpy change due to the rearrangement of the alkyl chains from flat to paraffine-type orientation and the gain of entropy due to conformational changes of the chains.

Original languageEnglish
Pages (from-to)214-220
Number of pages7
JournalProgress in Colloid and Polymer Science
Volume109
Publication statusPublished - Dec 1 1998

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Keywords

  • Adsorption from solution
  • Alkylammonium ions
  • Clay minerals
  • Microcalorimetry
  • Swelling
  • Thermodynamics
  • Verimiculite

ASJC Scopus subject areas

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

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