Small-angle X-ray scattering of colloidal aerosil particles in binary liquid mixtures

I. Dékány, László Turi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Hydrophilic and hydrophobic colloid SiO2 particles dispersed in benzene-n-heptane mixtures were studied by small-angle X-ray scattering (SAXS) in an He atmosphere. The adsorption of the components, the theological properties and the optical density of the suspensions were also determined. In mixtures of benzene and n-heptane, adhesion between the particles decreased due to the positive adsorption of benzene, since, according to results obtained by micro-calorimetry the heat of wetting increases in benzene-rich mixtures. According to SAXS measurements, the difference between hydrophilic and hydrophobic particles is well characterized by the primary scattering intensities I(o). Correlation length and the course of the distance distribution function P(r), were calculated from I(h), yield information on aggregation and on the stability of the disperse system. The theological flow curves reveal that in n-heptane there are strong adhesive interactions between both hydrophilic and hydrophobic particles. The yield value τ(B) is characteristic of interparticle interactions, and changes in parallel with the tail-end constant K, and with the parameter of inhomogeneity. Aggregation is also demonstrated by the observation of the relative internal surface of the suspension changes with the composition of the mixture.

Original languageEnglish
Pages (from-to)233-243
Number of pages11
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume133
Issue number3
DOIs
Publication statusPublished - Feb 28 1998

Fingerprint

Benzene
X ray scattering
Silicon Dioxide
Particles (particulate matter)
Heptane
heptanes
benzene
Liquids
liquids
scattering
Suspensions
x rays
Agglomeration
Adsorption
adsorption
Density (optical)
optical density
Colloids
Calorimetry
adhesives

Keywords

  • Adsorption
  • Hydrophilic/hydrophobic surfaces
  • Rheology of suspensions
  • SAXS
  • Silica particles
  • Wetting

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Small-angle X-ray scattering of colloidal aerosil particles in binary liquid mixtures. / Dékány, I.; Turi, László.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 133, No. 3, 28.02.1998, p. 233-243.

Research output: Contribution to journalArticle

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