Thermal-stability of mixed giant micelles of alkyltrimethylammonium surfactants and salicylate

Roberta K Rodrigues; Thiago H Ito; Edvaldo Sabadini

doi:10.1016/j.jcis.2011.08.048

Thermal-stability of mixed giant micelles of alkyltrimethylammonium surfactants and salicylate

J Colloid Interface Sci. 2011 Dec 15;364(2):407-12. doi: 10.1016/j.jcis.2011.08.048. Epub 2011 Aug 28.

Authors

Roberta K Rodrigues¹, Thiago H Ito, Edvaldo Sabadini

Affiliation

¹ Department of Physical Chemistry, Institute of Chemistry, University of Campinas, P.O. Box 6154, 13084-970 Campinas, SP, Brazil.

PMID: 21924732
DOI: 10.1016/j.jcis.2011.08.048

Abstract

When diluted solutions of giant micelles 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 giant micelles. Based on this property, we present a thermal-flow study of a mixed giant micelle formed by the combination of two surfactants and sodium salicylate. One of the surfactants, cetyltrimethylammonium bromide (C(16)TAB) was kept fixed, and the others were dodecyltrimethylammonium bromide (C(12)TAB), tetradecyltrimethylammonium bromide (C(14)TAB), octadecyltrimethylammonium bromide (C(18)TAB), 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 C(16)TAB was combined with the shorter surfactants.