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Association behaviour of glucitol amine gemini surfactants : Self-consistent-field theory and molecular-dynamics
M C P van Eijk1, M Bergsma2, S-J Marrink3
1Lund University, Center for Chemistry and Chemical Engineering, Physical Chemistry 1, P. O. Box 124, 221 00 Lund, Sweden, Lund, Sweden.
Abstract:
The association behaviour of a number of glucitol amine gemini surfactants has been investigated by means of molecular dynamics and self-consistent-field calculations. We have shown that the titratable head group of the surfactant is responsible for a micelle-to-membrane transition when changing the pH. Furthermore, the association structure of this group of surfactants is shown to be very sensitive to ionic strength. The combination of a charged head group, a spacer, and the hydrophilic glucitol side chains is responsible for the possible structural transitions in the associates as a function of ionic strength and pH.
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