Variable thickness of the liquid sorption layers on solid surfaces

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Abstract

Calculations of the adsorption capacity and the thickness of the adsorption layer are of primary importance for studies of the adsorption of binary mixtures. Earlier methods were applicable to the determination of real adsorption capacity only in the case of monolayers and/or layers of constant thickness, independent even of mixture composition. In the case of the adsorption isotherms of binary mixtures of non-electrolytes these conditions are often not fulfilled, and neither the Schay-Nagy extrapolation method nor reciprocal isotherm representations can be used for the determination of adsorption capacity on the basis of adsorption isotherms. Here we present a method of calculation suitable for the computation of surface composition and adsorption layer thickness in the whole composition range. Thus, instead of a single value of adsorption capacity, the system is characterized by the layer thickness isotherm given as a function of the composition of the bulk phase.

Original languageEnglish
Pages (from-to)305-317
Number of pages13
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume141
Issue number3
DOIs
Publication statusPublished - Nov 15 1998

Fingerprint

solid surfaces
sorption
Sorption
Adsorption
adsorption
Liquids
liquids
isotherms
Binary mixtures
Adsorption isotherms
Isotherms
Chemical analysis
binary mixtures
Extrapolation
Surface structure
Monolayers
extrapolation

Keywords

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

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

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abstract = "Calculations of the adsorption capacity and the thickness of the adsorption layer are of primary importance for studies of the adsorption of binary mixtures. Earlier methods were applicable to the determination of real adsorption capacity only in the case of monolayers and/or layers of constant thickness, independent even of mixture composition. In the case of the adsorption isotherms of binary mixtures of non-electrolytes these conditions are often not fulfilled, and neither the Schay-Nagy extrapolation method nor reciprocal isotherm representations can be used for the determination of adsorption capacity on the basis of adsorption isotherms. Here we present a method of calculation suitable for the computation of surface composition and adsorption layer thickness in the whole composition range. Thus, instead of a single value of adsorption capacity, the system is characterized by the layer thickness isotherm given as a function of the composition of the bulk phase.",
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AU - Berger, F.

AU - Dékány, I.

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N2 - Calculations of the adsorption capacity and the thickness of the adsorption layer are of primary importance for studies of the adsorption of binary mixtures. Earlier methods were applicable to the determination of real adsorption capacity only in the case of monolayers and/or layers of constant thickness, independent even of mixture composition. In the case of the adsorption isotherms of binary mixtures of non-electrolytes these conditions are often not fulfilled, and neither the Schay-Nagy extrapolation method nor reciprocal isotherm representations can be used for the determination of adsorption capacity on the basis of adsorption isotherms. Here we present a method of calculation suitable for the computation of surface composition and adsorption layer thickness in the whole composition range. Thus, instead of a single value of adsorption capacity, the system is characterized by the layer thickness isotherm given as a function of the composition of the bulk phase.

AB - Calculations of the adsorption capacity and the thickness of the adsorption layer are of primary importance for studies of the adsorption of binary mixtures. Earlier methods were applicable to the determination of real adsorption capacity only in the case of monolayers and/or layers of constant thickness, independent even of mixture composition. In the case of the adsorption isotherms of binary mixtures of non-electrolytes these conditions are often not fulfilled, and neither the Schay-Nagy extrapolation method nor reciprocal isotherm representations can be used for the determination of adsorption capacity on the basis of adsorption isotherms. Here we present a method of calculation suitable for the computation of surface composition and adsorption layer thickness in the whole composition range. Thus, instead of a single value of adsorption capacity, the system is characterized by the layer thickness isotherm given as a function of the composition of the bulk phase.

KW - Adsorption

KW - Adsorption capacity

KW - Adsorption layer thickness

KW - Binary mixtures

KW - Free enthalpy of adsorption

KW - Multilayers

KW - Surface layer composition

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