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Type: Artigo de periódico
Title: Thermal-stability of mixed giant micelles of alkyltrimethylammonium surfactants and salicylate
Author: Rodrigues, RK
Ito, TH
Sabadini, E
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(14)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. (C) 2011 Elsevier Inc. All rights reserved.
Subject: Giant mixed micelles
Thermal stability
Flow properties
Country: EUA
Editor: Academic Press Inc Elsevier Science
Citation: Journal Of Colloid And Interface Science. Academic Press Inc Elsevier Science, v. 364, n. 2, n. 407, n. 412, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.jcis.2011.08.048
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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