Stability of hydrophilic/hydrophobic silica particles in binary liquids: Adsorption, rheological and SAXS experiments

I. Dékány, T. Haraszti, L. Turi, Z. Király

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Dispersions of hydrophilic and hydrophobic SiO2 particles in binary mixtures (ethanol-cyclohexane, ethanol-toluene, benzene-n-heptane) were studied in order to gain information on the interaction between the solid particles and the dispersion medium as well as on interparticle interactions. Knowledge of interparticle interactions and wetting on the solid/liquid interface allows valuable information to be obtained regarding the stability of disperse systems. Adsorption excess isotherms need to be determined in binary mixtures for determination of the composition and thickness of the adsorption layer. Heat of wetting and free energy of wetting are also indicative of the strength of the solid/liquid interfacial interaction. Interparticle interactions were characterized by the rheological properties of the suspensions (yield value, energy of separation). The structure and the aggregated/ disaggregated state of the suspensions were inferred from light and X-ray scattering data. It may be established that interactions between dispersed SiO2 particles are determined by the composition of the binary mixture, the thickness of the adsorption layer and the Hamaker constants of the dispersion medium and the adsorption layer.

Original languageEnglish
Pages (from-to)65-73
Number of pages9
JournalProgress in Colloid and Polymer Science
Volume111
Publication statusPublished - 1998

Fingerprint

Binary mixtures
Silicon Dioxide
Wetting
Silica
silicon dioxide
Adsorption
adsorption
Suspensions
Liquids
Ethanol
liquids
binary mixtures
wetting
Experiments
Toluene
interactions
Heptane
Cyclohexane
Benzene
X ray scattering

Keywords

  • Adsorption
  • Colloid stability
  • Light scattering
  • SAXS rheology

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Chemistry (miscellaneous)
  • Colloid and Surface Chemistry
  • Polymers and Plastics

Cite this

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title = "Stability of hydrophilic/hydrophobic silica particles in binary liquids: Adsorption, rheological and SAXS experiments",
abstract = "Dispersions of hydrophilic and hydrophobic SiO2 particles in binary mixtures (ethanol-cyclohexane, ethanol-toluene, benzene-n-heptane) were studied in order to gain information on the interaction between the solid particles and the dispersion medium as well as on interparticle interactions. Knowledge of interparticle interactions and wetting on the solid/liquid interface allows valuable information to be obtained regarding the stability of disperse systems. Adsorption excess isotherms need to be determined in binary mixtures for determination of the composition and thickness of the adsorption layer. Heat of wetting and free energy of wetting are also indicative of the strength of the solid/liquid interfacial interaction. Interparticle interactions were characterized by the rheological properties of the suspensions (yield value, energy of separation). The structure and the aggregated/ disaggregated state of the suspensions were inferred from light and X-ray scattering data. It may be established that interactions between dispersed SiO2 particles are determined by the composition of the binary mixture, the thickness of the adsorption layer and the Hamaker constants of the dispersion medium and the adsorption layer.",
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author = "I. D{\'e}k{\'a}ny and T. Haraszti and L. Turi and Z. Kir{\'a}ly",
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T1 - Stability of hydrophilic/hydrophobic silica particles in binary liquids

T2 - Adsorption, rheological and SAXS experiments

AU - Dékány, I.

AU - Haraszti, T.

AU - Turi, L.

AU - Király, Z.

PY - 1998

Y1 - 1998

N2 - Dispersions of hydrophilic and hydrophobic SiO2 particles in binary mixtures (ethanol-cyclohexane, ethanol-toluene, benzene-n-heptane) were studied in order to gain information on the interaction between the solid particles and the dispersion medium as well as on interparticle interactions. Knowledge of interparticle interactions and wetting on the solid/liquid interface allows valuable information to be obtained regarding the stability of disperse systems. Adsorption excess isotherms need to be determined in binary mixtures for determination of the composition and thickness of the adsorption layer. Heat of wetting and free energy of wetting are also indicative of the strength of the solid/liquid interfacial interaction. Interparticle interactions were characterized by the rheological properties of the suspensions (yield value, energy of separation). The structure and the aggregated/ disaggregated state of the suspensions were inferred from light and X-ray scattering data. It may be established that interactions between dispersed SiO2 particles are determined by the composition of the binary mixture, the thickness of the adsorption layer and the Hamaker constants of the dispersion medium and the adsorption layer.

AB - Dispersions of hydrophilic and hydrophobic SiO2 particles in binary mixtures (ethanol-cyclohexane, ethanol-toluene, benzene-n-heptane) were studied in order to gain information on the interaction between the solid particles and the dispersion medium as well as on interparticle interactions. Knowledge of interparticle interactions and wetting on the solid/liquid interface allows valuable information to be obtained regarding the stability of disperse systems. Adsorption excess isotherms need to be determined in binary mixtures for determination of the composition and thickness of the adsorption layer. Heat of wetting and free energy of wetting are also indicative of the strength of the solid/liquid interfacial interaction. Interparticle interactions were characterized by the rheological properties of the suspensions (yield value, energy of separation). The structure and the aggregated/ disaggregated state of the suspensions were inferred from light and X-ray scattering data. It may be established that interactions between dispersed SiO2 particles are determined by the composition of the binary mixture, the thickness of the adsorption layer and the Hamaker constants of the dispersion medium and the adsorption layer.

KW - Adsorption

KW - Colloid stability

KW - Light scattering

KW - SAXS rheology

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