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The Influence of an Organic Salt on Micellization Behavior of Tetradecyltrimethylammonium Bromide in Aqueous Solutions of Trisubstituted Ionic Liquid [Odmim][Cl]
Author(s) -
Pal Amalendu,
Punia Renu
Publication year - 2020
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1002/jsde.12334
Subject(s) - chemistry , conductometry , ionic liquid , gibbs isotherm , gibbs free energy , critical micelle concentration , aqueous solution , enthalpy , dynamic light scattering , pulmonary surfactant , micelle , thermodynamics of micellization , bromide , inorganic chemistry , surface tension , organic chemistry , thermodynamics , chemical engineering , nanoparticle , biochemistry , physics , engineering , catalysis
The influence of sodium benzoate (Na‐Bz) on micellization behavior of the cationic surfactant tetradecyltrimethylammonium bromide (TTAB) in aqueous media of trisubstituted imidazolium‐based ionic liquid (IL), 1,2‐dimethyl‐3‐octylimidazolium chloride [odmim][Cl], was investigated using conductometry, tensiometry, fluorescence, 1 H NMR, Dynamic Light Scattering (DLS), and Rheology techniques. It was observed that with an increase in salt concentration, the critical micelle concentration (CMC) values of the system decrease. The CMC and various thermodynamic parameters like standard Gibbs free energy of micellization ( Δ G m 0 ), standard enthalpy change ( Δ H m 0 ), and standard entropy change ( Δ S m 0 ) were calculated using conductometry and surface parameters such as surface pressure at the interface (П cac ), maximum surface excess concentration (Г max ), minimum surface area per molecule ( A min ), and pC 20 (adsorption efficiency) were calculated using the tensiometry technique. The aggregation number ( N agg ) was calculated using fluorescence measurements. 1 H NMR spectra shed light on interactions between the salt and the cationic surfactant in 0.1 wt% IL. DLS gives information about the size distribution of micelles in solution at different concentrations of salt.