Journal Article10.1021/LA990060M
Interfacial Compositions and Phase Structures in Mixed Surfactant Microemulsions
Ali Bumajdad,Julian Eastoe,Peter C. Griffiths,David C. Steytler,Richard K. Heenan,Jian R. Lu,Peter Timmins +6 more
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TL;DR: In this paper, a mixture of didodecyldimethylammonium bromide (DDAB), with either n-dodecyltrimethyammonium (DTAB), sodium n-doride sulfate (SDS), or pentaethylene glycol monododefecyl ether (C12E5), has been used to stabilize water-in-heptane microemulsions.
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Abstract: Well-defined mixtures of didodecyldimethylammonium bromide (DDAB), with either n-dodecyltrimethylammonium bromide (DTAB), sodium n-dodecyl sulfate (SDS), or pentaethylene glycol monododecyl ether (C12E5), have been used to stabilize water-in-heptane microemulsions. Using DTAB or C12E5 with DDAB causes a synergistic effect, and the water solubilization capacity of the microemulsion is increased. However, with SDS there is a destabilization, indicating surfactant antagonism. Structure and dynamics in these systems have been studied as a function of surfactant type and composition using small-angle neutron scattering (SANS) and pulsed-field gradient NMR (PFG-NMR). Compositions of mixed films at these oil−water interfaces have also been measured, by blending deuterated DDAB with proteated DTAB or C12E5, and carrying out contrast variation SANS experiments. For both the DDAB/DTAB and DDAB/C12E5 mixtures, all the added surfactant was strongly adsorbed and there was no evidence for any significant partitioning i...
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TL;DR: The overall results, obtained, have been interpreted in terms of the model proposed by Shah and co-workers for the solubilization of water in water-in-oil microemulsions, as their model proposed that the two main effects that determine thesolubility of these systems are curvature of the surfactant film separating the oil and water and interactions between water droplets.
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Polymerization of Cationic Surfactant Phases
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Computer Simulations of Surfactant Mixtures at the Liquid/Liquid Interface
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