Preferential adsorption of cationic surfactant mixture studied by bromide ion selective total-reflection XAFS measurement

Kaoru Kashimoto, Kinue Shibata, Takashi Matsuda, Mayumi Hoshide, Yukari Jimura, Iwao Watanabe, Hajime Tanida, Hiroki Matsubara, Takanori Takiue, Makoto Aratono

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The total-reflection XAFS measurement possessing bromide ion selectivity at the interfacial region was applied to the adsorbed film of hexadecyltrimethylammonium chloride (HTAC) and dodecyltrimethylammonium bromide (DTAB) mixture. The surface compositions XjH of individual ions j (j = HTA+, Cl-, DTA+, and Br -) were evaluated by combining the surface excess concentration of Br- estimated from the XAFS with the surface composition of the respective surfactants from the surface tension results. It is clearly shown that HTA+ and Br- are preferentially adsorbed to DTA + and Cl- at the air/water interface. The preferential adsorption was estimated numerically in terms of activity coefficient f H,p of component i and excess Gibbs energy of adsorption ĝprH,E. Then, the magnitude of ĝprH,E was compared with that of ĝinH,E attributable to intrinsic interaction between ions.

Original languageEnglish
Pages (from-to)6693-6697
Number of pages5
JournalLangmuir
Volume24
Issue number13
DOIs
Publication statusPublished - Jul 1 2008

All Science Journal Classification (ASJC) codes

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

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