Hexadecyl-Containing Organic Salts as Novel Organogelators for Ionic, Eutectic, and Molecular Liquids

Abstract

The incorporation of a hexadecyl group on imidazolium, pyridinium, and pyrrolidinium scaffolds produces low-molecular-weight ionic organogelators that can gel several types of ionic liquids, deep eutectic solvents (DESs), and several molecular organic solvents. Minimum gelator concentrations fall in the 0.9–15.0% (w/v) range, with the lower end of the gelator concentrations observed in the gelation of DESs. On the basis of polarized optical microscopy, differential scanning calorimetry, and X-ray data, crystallization of these salts appear to produce high-surface-area crystals, which generate sufficiently stable three-dimensional networks that are capable of trapping the solvent molecules. Importantly, the nature of the fluid component of the gel appears to have a profound effect on the morphology of the crystallized organogelators. On the other hand, the organogelators appeared to modulate phase transitions of the liquids.

Concentration- and Temperature-Responsive Reversible Transition in Amide-Functionalized Surface-Active Ionic Liquids: Micelles to Vesicles to Organogel

“…Looking at the impact of concentration and temperature on the self-assembling behavior of surfactants in aqueous and nonaqueous media, − we hereby preliminary investigated the concentration- and temperature-induced phase transformation of AFSAILs in the DMSO/water system (Figure S3A) using visual observation and turbidity measurements (at 650 nm). All the three AFSAILs show concentration-dependent phase transition from transparent solution with negligible absorbance to a bluish turbid solution (Tyndall effect) with higher absorbance to the 3D gel with the highest absorbance (Figures S3A and ).…”

Self-Healable, Injectable, and Conductive Supramolecular Eutectogel for the Encapsulation and Sustained Release of the Anticancer Drug Curcumin

“…The homogeneous and transparent solution, free of visible fine particles and air bubbles, was kept at room temperature in a closed container. These DESs are completely hydrophilic in nature and are hygroscopic . Before use, the DESs were stored in vacuum desiccators in the presence of absorbents.…”

“…The formation of gel was assessed using the tube inversion method and falling ball method (Video S1). The concentrations of the surfactants taken for the formation of each eutectogels are listed in Table . , …”

Natural eutectogels: sustainable catalytic systems for C–C bond formation reactions

“…A recent development in the field is represented by gels formed using ionic liquids (ionogels or ionic liquid gels) [22][23][24][25] and even, deep eutectic solvents (eutecto gels). 23,[26][27][28][29][30] Thanks to their properties, supramolecular gels have been applied in different fields, like drug delivery systems, 31,32 sensors, [33][34][35] and sorbent systems for the removal of different environmental pollutants. [36][37][38] Among different applications, the use of these soft materials as reaction media has recently gained a raise in interest.…”