Critical micelle concentrations for alkyltrimethylammonium bromides in water from 25 to 160°C |
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| Authors: | D. Fennell Evans Martin Allen B. W. Ninham Abdel Fouda |
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| Affiliation: | (1) Department of Chemical Engineering and Materials Science, University of Minnesota, 55455 Minneapolis, MN;(2) Department of Chemistry, College of St. Thomas, 55105 St. Paul, MN;(3) Department of Applied Mathematics, Research School of Physical Sciences, Australian National University, 2600 Canberra, ACT, Australia;(4) Department of Chemistry, Mansoura University, Mansoura, Egypt |
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| Abstract: | Critical micelle concentrations were determined by conductance measurements for decyl-, dodecyl-, tetradecyl- and hexadecyltrimethylammonium bromide in water at 25, 60, 95, 130, and 160°C. The results are discussed in terms of the equilibrium model and the nonlinear Poisson-Boltzmann model for micelle formation. The free energies of transferring a methylene group from water to the oil-like interior of the micelle are found to be –781 at 25°C, –796 at 60°C, –819 at 95°C, –815 at 130°C, and –787 at 160°C cal-mol–1. |
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| Keywords: | Critical micelle concentrations alkyltrimethylammonium bromides hydrophobic interactions |
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