Calorimetry of micelle formation of binary nonionic surfactant mixtures

Akio Ohta, Shigeyoshi Miyagishi, Makoto Aratono

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


The thermodynamic equations necessary to obtain the enthalpy of micelle formation for binary mixed surfactant systems from the titration calorimetry of the aqueous solution of surfactant mixture were developed. They were applied to the experimental results of the following mixtures: pentaethylene glycol monodecyl ether-(C10E5), pentaethylene glycol monooctyl ether(C8E5), and C10E5-tetraethylene glycol monooctyl ether-(C8E4). It was found that C10E5 and C8E5 molecules are ideally mixed in the micelle from the viewpoint of the enthalpy as well as the Gibbs energy, whereas C10E5 and C8E4 molecules mix in a slightly nonideal fashion due to the positive excess enthalpy. Furthermore, it was shown that the excess entropy of mixed micelle formation of the C10E5-C8E4 system is positive.

Original languageEnglish
Pages (from-to)2826-2832
Number of pages7
JournalJournal of Physical Chemistry B
Issue number14
Publication statusPublished - Apr 12 2001

All Science Journal Classification (ASJC) codes

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


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