Partitioning behavior of silica in the Triton X-100/dextran/water aqueous biphasic system

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The partitioning behavior of silica particles was investigated in the Triton X-100/dextran/water system. It was found that both electrostatic effects and interactions between phase-component species and the solid surface played important roles in determining the distribution of solids. Silica partition was highly pH-dependent, which was interpreted in terms of the pH dependence of the Triton X-100/SiO2 interaction and the weak acidity of dextran. The presence of sodium dodecyl sulfate (SDS) moved the particles from the top surfactant-rich phase to the interface and the bottom phase, while dodecyltrimethylammonium bromide (DTAB) had the opposite effect. These trends are attributable to the electrostatic interaction between the charged mixed micelles in the top phase and the particles and to the fact that the ionic surfactants modified the adsorption density of the nonionic surfactant on silica.

Original languageEnglish (US)
Pages (from-to)298-307
Number of pages10
JournalJournal of Colloid And Interface Science
Volume272
Issue number2
DOIs
StatePublished - Apr 15 2004

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Dextran
Octoxynol
Dextrans
Silicon Dioxide
Silica
Surface-Active Agents
Water
Surface active agents
Nonionic surfactants
Sodium dodecyl sulfate
Micelles
Coulomb interactions
Acidity
Sodium Dodecyl Sulfate
Particles (particulate matter)
Electrostatics
Adsorption

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Cite this

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abstract = "The partitioning behavior of silica particles was investigated in the Triton X-100/dextran/water system. It was found that both electrostatic effects and interactions between phase-component species and the solid surface played important roles in determining the distribution of solids. Silica partition was highly pH-dependent, which was interpreted in terms of the pH dependence of the Triton X-100/SiO2 interaction and the weak acidity of dextran. The presence of sodium dodecyl sulfate (SDS) moved the particles from the top surfactant-rich phase to the interface and the bottom phase, while dodecyltrimethylammonium bromide (DTAB) had the opposite effect. These trends are attributable to the electrostatic interaction between the charged mixed micelles in the top phase and the particles and to the fact that the ionic surfactants modified the adsorption density of the nonionic surfactant on silica.",
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Partitioning behavior of silica in the Triton X-100/dextran/water aqueous biphasic system. / Zeng, X.; Osseo-Asare, K.

In: Journal of Colloid And Interface Science, Vol. 272, No. 2, 15.04.2004, p. 298-307.

Research output: Contribution to journalArticle

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