Effect of alkane chain length and counterion on the freezing transition of cationic surfactant adsorbed film at alkane mixture - water interfaces

Yuhei Tokiwa, Hiroyasu Sakamoto, Takanori Takiue, Makoto Aratono, Hiroki Matsubara

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Penetration of alkane molecules into the adsorbed film gives rise to a surface freezing transition of cationic surfactant at the alkane-water interface. To examine the effect of the alkane chain length and counterion on the surface freezing, we employed interfacial tensiometry and ellipsometry to study the interface of cetyltrimethylammonium bromide and cetyltrimethylammonium chloride aqueous solutions against dodecane, tetradecane, hexadecane, and their mixtures. Applying theoretical equations to the experimental results obtained, we found that the alkane molecules that have the same chain length as the surfactant adsorb preferentially into the surface freezing film. Furthermore, we demonstrated that the freezing transition temperature of cationic surfactant adsorbed film was independent of the kind of counterion.

Original languageEnglish
Pages (from-to)6235-6241
Number of pages7
JournalJournal of Physical Chemistry B
Volume119
Issue number20
DOIs
Publication statusPublished - May 21 2015

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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