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

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:364

Article

Rodrigues, Roberta K.¹  Ito, Thiago H.¹  Sabadini, Edvaldo¹ 

[1] Univ Campinas UNICAMP, Inst Chem, Dept Phys Chem, BR-13084970 Campinas, SP, Brazil

关键词: Giant mixed micelles;    Thermal stability;    Synergism;    Flow properties;   

DOI  :  10.1016/j.jcis.2011.08.048

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free