Abstract
Above the CMC, alkyl sulfate micelles exhibit a sphere-to-rod transitition which is dependent on temperature, NaC1 concentration and detergent concentration. Using the techniques of quasielastic light scattering we have studied this transition as a function of these variables and have also investigated the effects of alkyl chain length, counter-ion size and urea concentration on micellar growth. These experimental data are interpreted using a quantitative model for the sphere-to-rod transition in which a thermodynamic parameter K, which measures the difference in chemical potential for a detergent molecule in the spherical or cylindrical micellar structure, is seen to play a fundamental role. The contributions of electrostatic and hydrophobic interactions to the value of K are discussed using a theoretical equation and are assessed quantitatively from the experimental deductions of K as a function of NaC1 concentration, temperature and the other variables.
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Missel, P.J., Mazer, N.A., Carey, M.C., Benedek, G.B. (1982). Thermodynamics of the Sphere-to-Rod Transition in Alkyl Sulfate Micelles. In: Mittal, K.L., Fendler, E.J. (eds) Solution Behavior of Surfactants. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3491-0_19
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DOI: https://doi.org/10.1007/978-1-4613-3491-0_19
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