Effect of [C n mim][Br] Based Ionic Liquids on the Aggregation Behavior of Tetradecyltrimethylammonium Bromide in Aqueous Medium

Abstract

In order to gain insight into the role of environmentally benign imidazolium based ionic liquids (ILs) to alter the physicochemical properties of single chain cationic surfactants, we have investigated the effect of 1-hexyl-3-methylimidazolium bromide ([C 6 mim][Br]) and 1-octyl-3-methylimidazolium bromide ([C 8 mim][Br]) on the aggregation behavior of aqueous tetradecyltrimethylammonium bromide (TTAB). The critical micelle concentration (CMC) of TTAB at different concentrations of ILs was determined through conductance, surface tension, spectral change of a dye by UV-Vis measurement, and the pyrene fluorescence probe measurement techniques at 298.15 K. Decreasing of the CMC of aqueous TTAB with increasing ILs concentration proves the micellization is favorable. The effect of ILs on the properties of TTAB was verified by using NaBr. Surface tension measurements complimented by dynamic light scattering (DLS) data revealed the packing density of TTAB aggregates at different concentrations of ILs. The effective area of TTAB molecules at the air/water interface was calculated by the Gibbs adsorption isotherm and found to decrease up to 0.6 wt% of ILs followed by an increase at higher concentration. DLS data revealed an increase in micellar size of TTAB at higher concentration of IL with decrease in the aggregation number (N agg ), determined by the fluorescence quenching method.

Robust Superhydrophobic Brass Mesh with Electrodeposited Hydroxyapatite Coating for Versatile Applications

“…The CMC value was determined from the break point of the maximum bounding height/CA versus the changed concentration curve. The determined CMC value of TTAB using the maximum bounding height (2.32 mM) and the CA method (1.91 mM) were obtained, which were in good agreement with its theoretic value of 2.1 mM with a relative error of 10% and 9%, respectively [ 26 , 27 , 28 ]. The measurement error might be improved by the usage of more precise instrument and proficient operator.…”

Investigation on thermophysical and excess properties of binary mixtures of imidazolium based ionic liquids at temperatures (293.15 to 323.15) K: III [C n mim][PF 6 ] ( n = 4, 6, 8) + THF

“…Digital automatic refractometer (Abbemat 300) from Anton Paar was used to measure the refractive index. Details of the experimental setup and measuring procedure have been given in previous publications [7][8][9][10]. Solid-state built in thermostat controls the temperature by ±0.001 K in DSA 5000 and by ±0.0001 K in Abbemat 300.…”

“…We are engaged with the systematic investigation on the molecular interactions and structural effects of ILs with organic solvents and mixtures of common molecular solvents and have found interesting results [1][2][3][4][5][6][7][8][9][10].…”

“…Several researchers, including our own group[7][8][9][10][72][73][74][75][76][77][78][79][80][81] have successfully applied PFP theory for the prediction of excess molar volume for the mixtures containing ILs. As per the theory, a molecule is made up of equal segments which interact with the neighbouring sites.…”

Mixed Micellization and Spectroscopic Studies of Anti-Allergic Drug and Non-Ionic Surfactant in the Presence of Ionic Liquid

“…The decrease in surface activity of the drug can be understood with the fact that both drug and IL are positively charged, so these molecules of similar charge try to remain separate from each other at the surface monolayer. Thus, the space between monomers at the surface increases ( increases) and the surface activity decreases [ 58 ]. Another reason for the decreasing value after the addition of IL may be the partial adsorption of IL at the surface.…”