Partition of hematite in the Triton X-100/Dextran aqueous biphase system

X. Zeng, J. Quaye, Kwadwo Asare Osseo-Asare

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The principle behind the partition of inorganic particles in aqueous biphase systems is the physicochemical interaction between the solid surface and the surrounding liquid solution. This study demonstrates that many factors, such as hydrophilic/hydrophobic properties, polymer-solid specific interaction, and electrostatic effects, may influence the partition of metal oxides in aqueous biphase systems. In the Triton X-100/dextran/water system, hematite stays in the bottom dextran-rich phase under all pH conditions. This behavior is attributable to the hydrophilic nature of the solid surface and the strong interaction between dextran and ferric oxide. Anionic surfactants, e.g., sodium dodecylsulfate (SDS) or sodium oleate, have no effect on the solids partition; on the other hand, the cationic surfactant dodecyltrimethylammonium bromide (DTAB) is able to transfer the particles from the bottom to the top phase at high pH. Based on adsorption experiments, it is proposed that electrostatic interactions between the mixed micelles in the top phase and the particle surface play a dominant role in controlling the solids distribution.

Original languageEnglish (US)
Pages (from-to)135-145
Number of pages11
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume246
Issue number1-3
DOIs
StatePublished - Oct 1 2004

Fingerprint

dextrans
Dextran
Hematite
Octoxynol
hematite
Dextrans
partitions
solid surfaces
surfactants
sodium
electrostatics
interactions
guy wires
metal oxides
Sodium
bromides
micelles
Oxides
Anionic surfactants
Cationic surfactants

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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title = "Partition of hematite in the Triton X-100/Dextran aqueous biphase system",
abstract = "The principle behind the partition of inorganic particles in aqueous biphase systems is the physicochemical interaction between the solid surface and the surrounding liquid solution. This study demonstrates that many factors, such as hydrophilic/hydrophobic properties, polymer-solid specific interaction, and electrostatic effects, may influence the partition of metal oxides in aqueous biphase systems. In the Triton X-100/dextran/water system, hematite stays in the bottom dextran-rich phase under all pH conditions. This behavior is attributable to the hydrophilic nature of the solid surface and the strong interaction between dextran and ferric oxide. Anionic surfactants, e.g., sodium dodecylsulfate (SDS) or sodium oleate, have no effect on the solids partition; on the other hand, the cationic surfactant dodecyltrimethylammonium bromide (DTAB) is able to transfer the particles from the bottom to the top phase at high pH. Based on adsorption experiments, it is proposed that electrostatic interactions between the mixed micelles in the top phase and the particle surface play a dominant role in controlling the solids distribution.",
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Partition of hematite in the Triton X-100/Dextran aqueous biphase system. / Zeng, X.; Quaye, J.; Osseo-Asare, Kwadwo Asare.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 246, No. 1-3, 01.10.2004, p. 135-145.

Research output: Contribution to journalArticle

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