Effect of pressure on the adsorption and micelle formation of aqueous dodecyltrimethylammonium chloride solution-hexane system

M. Yamanaka, M. Aratono, K. Motomura, R. Matuura

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14 Citations (Scopus)

Abstract

The interfacial tension of aqueous dodecyltrimethylammonium chloride (DTAC) solution/hexane interface has been measured as a function of pressure at concentrations around the critical micelle concentration (CMC). The derivative of the interfacial tension with respect to pressure has been observed to change abruptly at the CMC as in the case of aqueous dodecylammonium chloride (DAC) solution-hexane system studied already. The volume changes associated with the adsorption of DTAC from its monomeric and micellar states have been calculated. The results have indicated that the micelle formation of surfactant is treated like the appearance of a new macroscopic phase in the system. It has also been concluded that the micelle solubilizing hexane bears resemblance to the adsorbed film in terms of the volume. The difference in the pressure dependence of the volume of micelle formation ΔνMW between DTAC and DAC has been attributed to a larger polar group of DTAC. The fact that the value of ΔνMW is larger than that estimated from the conductivity data has been explained by the solubilization of hexane into the micelle.

Original languageEnglish
Pages (from-to)338-341
Number of pages4
JournalColloid & Polymer Science
Volume262
Issue number4
DOIs
Publication statusPublished - Apr 1 1984

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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