Liquid adsorption and immersional wetting on hydrophilic/hydrophobic solid surfaces

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The preferential adsorption on adsorbents with different surface hydrophobicity (hydrophobic layer silicates) can be properly described by the thermodynamic data of the adsorbed layer. When the components in a binary liquid mixture are very different in polarity, as they are in methanol-benzene mixtures, the polarity of the surface can be characterized through the shape of the excess isotherms and the azeotropic composition. The free energy Δ21G = f(xl) calculated from the excess isotherms, gives information about the decrease in free energy due to the displacement. The displacement enthalpy isotherms Δ21H = f(x1) can be determined with flow microcalorimetry and the thermodynamic description of the adsorption layer is complete. The combination of displacement free energy and enthalpy with adsorption excess amounts gives a new way to determine the volume of the adsorbed layer. The combination also gives data to determination of the molar ( Δ21g, Δ21h) thermodynamic data, which describe the polarity of a surface in a certain liquid mixture.

Original languageEnglish
Pages (from-to)1499-1509
Number of pages11
JournalPure and Applied Chemistry
Volume64
Issue number10
DOIs
Publication statusPublished - Jan 1 1992

Fingerprint

Free energy
Isotherms
Wetting
Thermodynamics
Adsorption
Enthalpy
Liquids
Silicates
Hydrophobicity
Benzene
Adsorbents
Methanol
Chemical analysis

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Liquid adsorption and immersional wetting on hydrophilic/hydrophobic solid surfaces. / Dékány, I.

In: Pure and Applied Chemistry, Vol. 64, No. 10, 01.01.1992, p. 1499-1509.

Research output: Contribution to journalArticle

@article{fb7b6f1420c04e2781d905fadb04b60d,
title = "Liquid adsorption and immersional wetting on hydrophilic/hydrophobic solid surfaces",
abstract = "The preferential adsorption on adsorbents with different surface hydrophobicity (hydrophobic layer silicates) can be properly described by the thermodynamic data of the adsorbed layer. When the components in a binary liquid mixture are very different in polarity, as they are in methanol-benzene mixtures, the polarity of the surface can be characterized through the shape of the excess isotherms and the azeotropic composition. The free energy Δ21G = f(xl) calculated from the excess isotherms, gives information about the decrease in free energy due to the displacement. The displacement enthalpy isotherms Δ21H = f(x1) can be determined with flow microcalorimetry and the thermodynamic description of the adsorption layer is complete. The combination of displacement free energy and enthalpy with adsorption excess amounts gives a new way to determine the volume of the adsorbed layer. The combination also gives data to determination of the molar ( Δ21g, Δ21h) thermodynamic data, which describe the polarity of a surface in a certain liquid mixture.",
author = "I. D{\'e}k{\'a}ny",
year = "1992",
month = "1",
day = "1",
doi = "10.1351/pac199264101499",
language = "English",
volume = "64",
pages = "1499--1509",
journal = "Pure and Applied Chemistry",
issn = "0033-4545",
publisher = "IUPAC Secretariat",
number = "10",

}

TY - JOUR

T1 - Liquid adsorption and immersional wetting on hydrophilic/hydrophobic solid surfaces

AU - Dékány, I.

PY - 1992/1/1

Y1 - 1992/1/1

N2 - The preferential adsorption on adsorbents with different surface hydrophobicity (hydrophobic layer silicates) can be properly described by the thermodynamic data of the adsorbed layer. When the components in a binary liquid mixture are very different in polarity, as they are in methanol-benzene mixtures, the polarity of the surface can be characterized through the shape of the excess isotherms and the azeotropic composition. The free energy Δ21G = f(xl) calculated from the excess isotherms, gives information about the decrease in free energy due to the displacement. The displacement enthalpy isotherms Δ21H = f(x1) can be determined with flow microcalorimetry and the thermodynamic description of the adsorption layer is complete. The combination of displacement free energy and enthalpy with adsorption excess amounts gives a new way to determine the volume of the adsorbed layer. The combination also gives data to determination of the molar ( Δ21g, Δ21h) thermodynamic data, which describe the polarity of a surface in a certain liquid mixture.

AB - The preferential adsorption on adsorbents with different surface hydrophobicity (hydrophobic layer silicates) can be properly described by the thermodynamic data of the adsorbed layer. When the components in a binary liquid mixture are very different in polarity, as they are in methanol-benzene mixtures, the polarity of the surface can be characterized through the shape of the excess isotherms and the azeotropic composition. The free energy Δ21G = f(xl) calculated from the excess isotherms, gives information about the decrease in free energy due to the displacement. The displacement enthalpy isotherms Δ21H = f(x1) can be determined with flow microcalorimetry and the thermodynamic description of the adsorption layer is complete. The combination of displacement free energy and enthalpy with adsorption excess amounts gives a new way to determine the volume of the adsorbed layer. The combination also gives data to determination of the molar ( Δ21g, Δ21h) thermodynamic data, which describe the polarity of a surface in a certain liquid mixture.

UR - http://www.scopus.com/inward/record.url?scp=0001158227&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001158227&partnerID=8YFLogxK

U2 - 10.1351/pac199264101499

DO - 10.1351/pac199264101499

M3 - Article

AN - SCOPUS:0001158227

VL - 64

SP - 1499

EP - 1509

JO - Pure and Applied Chemistry

JF - Pure and Applied Chemistry

SN - 0033-4545

IS - 10

ER -