Immersional wetting and adsorption displacement on hydrophilic/hydrophobic surfaces

Adsorption excess isotherms were determined on planar surfaces and porous adsorbents in methanol-benzene and benzene- n-heptane mixtures. These functions give Δ 21 G = f( x 1) adsorption displacement free energy functions, which are characteristic of the polarities of the surfaces. Adsorption displa...

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Bibliographic Details
Published inJournal of colloid and interface science Vol. 147; no. 1; pp. 119 - 128
Main Authors Dékány, Imre, Nagy, Lajos György
Format Journal Article
LanguageEnglish
Published San Diego, CA Elsevier Inc 1991
Elsevier
Subjects
Chemistry
Exact sciences and technology
General and physical chemistry
Solid-liquid interface
Surface physical chemistry
Liquid solid interface
Hydrocarbon
Wetting
Liquid solid adsorption
Organic adsorbate
Adsorption isotherm
Alcohol
Excess parameter
Inorganic adsorbent
Silicates
Experimental study
Silica
Free energy
Binary mixture
Benzene
Silica gel
Thermodynamic properties
Surface energy
Methanol
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Summary:Adsorption excess isotherms were determined on planar surfaces and porous adsorbents in methanol-benzene and benzene- n-heptane mixtures. These functions give Δ 21 G = f( x 1) adsorption displacement free energy functions, which are characteristic of the polarities of the surfaces. Adsorption displacement enthalpy isotherms were also determined through immersion wetting and flow microcalorimetry measurements and, thus, entropy changes could be calculated as well. New equations are given for molar adsorption displacement energy and adsorption capacity calculations via the combination of enthalpy and free energy isotherms with adsorption excess isotherms.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(91)90140-4