A thermodynamic investigation of the effect of cationic structure on the self-aggregation behavior of Surface-Active ionic liquids in the presence of an amino acid

A series of imidazolium-based ionic liquids (ILs) with varying side alkyl chain length at N3 position which includes [C(12)mim] [Br], [C(12)eim][Br], and [C(12)bim][Br] have been synthesized and characterized by H-1 NMR. Then, their aggregation behavior in the presence of different concentrations of the amino acid L-Tryptophan (L-Trp) at different temperatures has been examined using conductometric, tensiometric, and UV-vis (absorption spectra) techniques. The critical micelle concentration (CMC) of ILs has been investigated in the absence and presence of amino acid to acquire a better understanding of the colloidal behavior of ILs in presence of amino acid as an external additive. The addition of amino acid is observed to reduce the CMC values of the ILs examined in an aqueous media. Likewise, applying a charged pseudo-phase model of micellization, the thermodynamic parameters of micellization, such as a change in standard free energy (Delta G(m)degrees), change in standard enthalpy (Delta H-m degrees), and change in standard entropy (Delta S-m degrees), have been scrutinized from the dependence of CMC on temperature. The surface tension approach was also used to evaluate interfacial characteristics. It was discovered that increasing the length of the side chain increases surface activity. All of the estimated parameters were utilized to determine the electrostatic and hydrophobic contributions of IL to the formation of micellar aggregates. (C) 2022 Published by Elsevier B.V.

Automated summary

A series of imidazolium-based ionic liquids with varying side alkyl chain length were synthesized and their aggregation behavior in the presence of an amino acid was investigated. The addition of the amino acid was found to reduce the critical micelle concentration of the ionic liquids, and increasing the side chain length increased the surface activity.