Abstract
Viscosity measurements have been made to the solutions of dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB) in 0.10, 0.20, 0.30, and 0.40 volume fractions of methanol in methanol-water mixed solvent media at 298.15, 308.15, 318.15, and 323.25 K. Critical micelle concentration (CMC) values have been determined. From relative viscosity for surfactant solutions, related viscosityBcoefficients are calculated and the values are interpreted in terms of solute-solvent interactions.
Highlights
Cationic surfactants find applications on different fields such as antibacterial properties, lubricants, retarding agents, softeners, and antistatic agents [1, 2]
Two cationic surfactants were used for the investigation: dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB)
The variation of viscosity with concentration of solutions of DTAB and CTAB is presented in Figures 1 and 2, respectively, as representative graphs
Summary
Cationic surfactants find applications on different fields such as antibacterial properties, lubricants, retarding agents, softeners, and antistatic agents [1, 2]. Properties of surfactants are evaluated by the formation of aggregates known as micelle which is affected by different factors such as presence of organic and inorganic additives and temperature Due to these reasons, micellization of cationic surfactants in binary mixed solvent media has been studied extensively by the researchers [2–8]. The interaction between surfactant and the solvent is of great interest due to two kinds of interactions: one is interaction of solvent with solvophobic part (tail) and another is solvent with solvophilic part (head) of surfactant molecules Due to these two interactions there is change in the viscous flow of liquid and thereby change in various physiochemical properties [1]
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