Cationic micelles in deep eutectic solvents: effects of solvent composition†

IF 3.4 3区化学 Q2 Chemistry

Faraday Discussions Pub Date : 2024-03-18 DOI:10.1039/D4FD00045E

Iva Manasi, Stephen M. King and Karen J. Edler

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Abstract

Deep eutectic solvents (DES) are mixtures of hydrogen bond donors and acceptors that form strongly hydrogen-bonded room temperature liquids. Changing the H-bonding components and their ratios can alter the physicochemical properties of deep eutectic solvents. Recent studies have shown p-toluenesulfonic acid (pTSA) forms room temperature liquids with choline chloride (ChCl) at different molar ratios: 1 : 1, 1 : 2 and 2 : 1 [Rodriguez Rodriguez et al., ACS Sustain. Chem. Eng., 2019, 7(4), 3940]. They also showed that the composition affects the physical properties of these liquids and their ability to dissolve metal oxides. In this work we evaluate the solubility and self-assembly of cationic surfactants alkyltrimethyl ammonium bromides (CnTAB) in these pTSA/ChCl based liquids. CnTABs are insoluble in 1pTSA : 2ChCl, whereas in 1pTSA : 1ChCl and 2pTSA : 1ChCl they form micelles. We characterise CnTAB (n = 12, 14, 16) micelles using small angle neutron scattering and also look at interaction of water with the micelles. These studies help determine the interaction of DES components with the surfactant and the influence of varying pTSA and water ratios on these interactions. This provides potential for controlled surfactant templating and for tuning rheology modification in such systems.

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深共晶溶剂中的阳离子胶束：溶剂成分的影响

深共晶溶剂（DES）是氢键供体和受体的混合物，可形成氢键很强的室温液体。改变氢键成分及其比例可以改变深共晶溶剂（DES）的理化性质。最近的研究表明，对甲苯磺酸（pTSA）与氯化胆碱（ChCl）以不同的摩尔比形成室温液体：1:1、1:2 和 2:1 [Rodriguez Rodriguez 等人，ACS 可持续化学与工程，2019 年，7（4），3940]。他们还表明，成分会影响这些液体的物理性质及其溶解金属氧化物的能力。在这项工作中，我们评估了阳离子表面活性剂烷基三甲基溴化铵（CnTAB）在这些基于 pTSA/ChCl 的液体中的溶解性和自组装性。CnTAB 在 1pTSA:2ChCl 中不溶解，而在 1pTSA:1ChCl 和 2pTSA;1ChCl 中则形成胶束。我们使用小角中子散射法对 CnTAB（n=12、14、16）胶束进行了表征，并研究了水与胶束的相互作用。这些研究有助于确定 DES 成分与表面活性剂的相互作用，以及不同 pTSA 和水比例对这些相互作用的影响。这为控制表面活性剂模板和调整此类体系中的流变修饰提供了可能。

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