Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 235, Issue 2, Pages 201-209Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jcis.2000.7364
Keywords
amphiphiles; critical micelle concentration; micelles; octyltrimethylammonium bromide; thermodynamics
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Association processes in aqueous solutions of octyltrimethylammonium bromide, C(8)TAB, have been studied in aqueous NaBr solutions at temperatures from 20 to 55 degreesC. The values of the critical micelle concentration, CMC, were determined from the intersections of two straight line portions of the plots of the relationship between adiabatic compressibility of the solutions and surfactant concentration. The value of the CMC thus determined exhibits minima at a certain temperature, T-min. The value of T-min shifts toward a lower temperature with increasing NaBr concentration. Based on the most probable micelle size model, the values of thermodynamic functions of micelle formation have been estimated at various temperatures. (C) 2001 Academic Press.
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