Effect of Surface Freezing on Stability of Oil-in-Water Emulsions

Yuhei Tokiwa, Hiromu Sakamoto, Takanori Takiue, Makoto Aratono, Hiroki Matsubara, Colin D. Bain

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Penetration of alkane molecules into the adsorbed film of a cationic surfactant gives rise to a surface freezing transition at the alkane-water interface upon cooling. In this paper, we show that surface freezing of hexadecyltrimethylammonium chloride (CTAC) at the tetradecane-water interface stabilizes oil-in-water (OW) emulsions. For concentrations of CTAC near the critical micelle concentration, an OW emulsion coalesced readily above the surface freezing transition whereas the OW emulsion was stable in the surface frozen state. There was a discontinuous change in the stability of the OW emulsion at a temperature very close to the surface phase transition temperature as determined by interfacial tensiometry and ellipsometry on a planar oil-water interface. The mechanical elasticity of the surface frozen layer opposes film drainage and density fluctuations that could lead to rupture and is the most likely cause of the enhanced emulsion stability.

Original languageEnglish
Pages (from-to)6205-6209
Number of pages5
JournalLangmuir
Volume34
Issue number21
DOIs
Publication statusPublished - May 29 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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