Understanding aggregation behavior of Tetronics®-ionic liquid interactions via cloud point, DLS, SANS, and
Jaykumar J Gami1, Mehul Khimani2, Sugam Kumar3
1Department of Organic Chemistry, Institute of Science & Technology for Advanced Studies & Research (ISTAR), The Charutar Vidya Mandal (CVM) University, Vallabh Vidyanagar 388120, Gujarat, India.
Abstract:
The micellization behavior of Tetronics® T904 and T1304 in aqueous solution was systematically investigated using cloud point (CP) measurements, dynamic light scattering (DLS), small-angle neutron scattering (SANS), and computational approaches. The ionic liquids (ILs) studied included pyridinium, picolinium, and imidazolium derivatives with varying alkyl chain lengths and counterions. The synthesized ILs were analyzed structurally using spectroscopic methods. The experiments revealed that the incorporation of ILs led to an increase in cloud points and a notable decrease in the hydrodynamic diameter (Dh) of the micelles. According to SANS studies, the addition of ILs to pure Tetronics® resulted in a reduction of the micellar core radius. The combined data showed that IL-induced demicellization occurred, and the IL head group, chain length, and counterion identity significantly influenced the extent of disruption. Further molecular-level insights were provided by Density Functional Theory (DFT) calculations, which indicated that the electronic energy gap widened in the presence of ILs, thereby explaining the observed destabilization of micellar assemblies. This study highlights the critical impact of IL structural characteristics on the self-assembly of Tetronics®, which has implications for the customization of responsive soft matter systems.
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