Light scattering and the fractal properties of hydrophilic and hydrophobic SiO2 aggregates in ethanol-toluene binary mixtures

Tamás Haraszti, I. Dékány

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The aggregation properties of silica particles with hydrophilic or hydrophobic surface were investigated in ethanol-toluene binary mixtures. The interaction between the particles was altered by changing the composition of the liquid mixture from pure ethanol to pure toluene. The kinetic stability of the sols decreased with increasing concentration of toluene for the hydrophilic particles and with increasing concentration of ethanol for the hydrophobic particles. The decreasing stability correlated well with the variation of the second virial coefficient determined from turbidity measurements and the concentration dependence of the mass fractal dimension, d(c, x1), determined from static light scattering. This latter parameter indicated that the aggregation structure is dominated by chainlike aggregates (d≈1) for the more stable suspensions and more space filling structures (d≈3) for the less stable systems.

Original languageEnglish
Pages (from-to)736-743
Number of pages8
JournalColloid & Polymer Science
Volume280
Issue number8
DOIs
Publication statusPublished - 2002

Fingerprint

Toluene
Binary mixtures
Fractals
Light scattering
binary mixtures
toluene
fractals
Ethanol
ethyl alcohol
light scattering
Agglomeration
Polymethyl Methacrylate
Turbidity
Fractal dimension
Sols
Silicon Dioxide
turbidity
Suspensions
virial coefficients
Silica

Keywords

  • Binary mixtures
  • Colloid stability
  • Fractal structure
  • Second virial coefficient
  • Static light scattering

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Light scattering and the fractal properties of hydrophilic and hydrophobic SiO2 aggregates in ethanol-toluene binary mixtures. / Haraszti, Tamás; Dékány, I.

In: Colloid & Polymer Science, Vol. 280, No. 8, 2002, p. 736-743.

Research output: Contribution to journalArticle

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