Modulation of Aggregation Behaviour of Anionic Surfactant in the Presence of Aqueous Quaternary Ammonium Salts

Abstract

The self-aggregation of sodium dodecylsulphate (SDS), an anionic surfactant, in aqueous solutions of tetraalkylammonium bromide salts (R 4 NBr, where R = propyl, butyl and pentyl) was determined at various temperatures in the range 288.15-318.15 K. The critical micelle concentration (CMC) determined from conductivity data was used to study the thermodynamics of the surfactant. The presence of bromide salts was found to affect the micellization of SDS in accordance with the hydrophobicity of the tetraalkylammonium cations, thus the CMC values follow the order no additive [ Pr 4-NBr [ Bu 4 NBr [ Pen 4 NBr. The results from conventional conductivity methods were combined with those of spectroscopic techniques like fluorescence and UV-Vis studies.

Modulation in Aggregation Behavior of Cationic Surfactant in Presence of Fluoroquinolone Drug: A Physicochemical Approach

“…The compensation isotherms in Fig. b depict that T c lies in the array of ~ (298–307) K and is in good concurrence with the values for various alkyl ammonium bromide surfactants reported in the literature (Chauhan and Kaur, ). Therefore, the findings show the involvement of a chemical component in aggregation.…”

Surface adsorption and thermodynamic properties of mixed system of ionic liquid surfactants with cetyltrimethyl ammonium bromide

“…The temperature dependence of the CMC has been employed to compute the thermodynamic parameters of micellization in order to obtain better knowledge about the behavior of the surfactant and intermolecular interactions present in such systems. 35 The thermodynamic parameters of the C n mimBr/CTAB mixed system at different CTAB concentrations are shown in Fig. 4.…”

Conductometric Probe Analysis of the Effect of Benzyldimethylhexadecylammonium Chloride on the Micellization Behavior of Dodecyltrimethylammonium Bromide in Aqueous/Urea Solution: Investigation of Concentration and Temperature Effect

“…It is considered that the increase in hydrophobicity as a result of the increase in the dehydration of the head groups and the destruction of the micelle is due to the thermal solubility of amphiphiles. Moreover, different factors can be attributed in the case of ionic and non‐ionic surfactants, as reported in the literature (Chauhan & Kaur, ; Chauhan, Kaur, Rana, & Chauhan, ; Chen, Xin, Yu, & Lan, ). In the present case, the CMC values first increase with the increase of temperature, reach a maximum, and then decrease with increasing temperature.…”

“…The decreased solvation of the ionic/polar head group of pure/mixed surfactant molecules (decrease in hydrophilic hydration) favors micelle formation, i.e., the CMC values decrease with disruption of the structured water molecules. The disruption of hydrogen bonds surrounding the nonpolar parts of surfactant molecules (decrease in hydrophobic dehydration) through increased temperature inhibits micelle formation, i.e., the CMC values increase (Chauhan et al, ; Chauhan & Kaur, ; Hoque, Khan, et al, ; Hoque, Hossain, et al, 2013; Treiner & Makayssi, ). The magnitude of these effects determines whether the CMC increases or decreases over a distinct range of temperatures.…”