Effect of charged colloidal particles on adsorption of surfactants at oil-water interface

Weixing Wang, Zhiang Zhou, K. Nandakumar, Zhenghe Xu, Jacob H. Masliyah*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

A change of oil/water interfacial tension in the presence of cationic or anionic surfactants in an organic phase was observed due to the addition of charged fine solids in the aqueous phase. The charged fine solids in the aqueous phase adsorb surfactants diffused from the oil phase, thereby causing an increase in the bulk equilibrium surfactant concentration in the aqueous phase, governed by the Stern-Grahame equation. Consequently, surfactant adsorption at the oil-water interface increases, which was demonstrated from the measured reduction of the oil-water interfacial tension. The increased surfactant partition in the aqueous phase in the presence of the charged particles was confirmed by the measured decrease in the surface tension for the collected aqueous solution after solids removal, as compared with the cases without solids addition.

Original languageEnglish
Pages (from-to)625-630
Number of pages6
JournalJournal of Colloid and Interface Science
Volume274
Issue number2
DOIs
StatePublished - 15 Jun 2004
Externally publishedYes

Keywords

  • Alumina
  • Dodecylamine
  • Emulsion
  • Interfacial tension
  • Kaolinite
  • Palmitic acid
  • Silica

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