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    Thermal-Stability of Mixed Giant Micelles of Alkyltrimethylamonium Surfactants and Salicylate

    Year: 2011

    Journal: Journal of Colloid and Interface Science 2011, 364 (2) pp 407-412, 20121211

    Authors: Roberta K. Rodrigues, Thiago H. Ito, Edvaldo Sabadini

    Organizations: Department of Physical Chemistry, Institute of Chemistry, University of Campinas – UNICAMP, P.O. Box 6154, 13084-970 Campinas, SP, Brazil

    When diluted solutions of giantmicelles are under turbulent flow, large attenuations of the turbulence can be observed due to the action of the micelles on the dissipative vortices formed within the flow. This particular property is rapidly lost when the solution is heated due breakup of the giantmicelles. Based on this property, we present a thermal-flow study of a mixedgiantmicelle formed by the combination of two surfactants and sodium salicylate. One of the surfactants, cetyltrimethylammonium bromide (C16TAB) was kept fixed, and the others were dodecyltrimethylammonium bromide (C12TAB), tetradecyltrimethylammonium bromide (C14TAB), octadecyltrimethylammonium bromide (C18TAB), polyoxyethylene (10) oleyl ether (Brij 97) or sodium dodecyl sulfate (SDS). Thermal diagrams for the combinations of the surfactants reveal deviations of the ideality. For the cationic surfactants, a synergistic effect was only observed when C16TAB was combined with the shorter surfactants.