Thermodynamic properties of the S/L interfacial layer: Stabilization of the colloidal system in binary liquids

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Abstract

In the knowledge of the adsorption and wetting properties of solid particles the influence of particle-liquid and interparticle interaction has been examined on the stability and structure formation of suspensions obtained for hydrophobic Si02 colloids in the mixtures benzene+n-heptane and methanol+benzene. The Hamaker constants of the adsorption layer of composition range. The Hamaker constant have been determined by optical dispersion measurements in the entire mixture composition range. The Hamaker constant of the adsorption layer of composition different from that in the bulk have been calculated at several mixture compositions on the basis of the adsorption results. Having the excess isotherms available enabled us to determine the adsorption layer thickness as a function of the bulk composition. For interparticle attractive potentials, model calculations have been effected on the basis of the Vincent model. In the case of hydrophobic particles dispersed in benzene+n-heptane and methanol+benzene mixtures it was established that the change of the attractive potential was in accordance with the interactions obtained from rheological measurements.

Original languageEnglish
Pages (from-to)901-906
Number of pages6
JournalPure and Applied Chemistry
Volume65
Issue number5
DOIs
Publication statusPublished - Jan 1 1993

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Benzene
Thermodynamic properties
Stabilization
Adsorption
Liquids
Chemical analysis
Heptane
Methanol
Colloids
Isotherms
Wetting
Suspensions
n-heptane

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Thermodynamic properties of the S/L interfacial layer : Stabilization of the colloidal system in binary liquids. / Dékány, Imre.

In: Pure and Applied Chemistry, Vol. 65, No. 5, 01.01.1993, p. 901-906.

Research output: Contribution to journalArticle

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