Abstract In the present study, the volumetric behaviour of mixtures of (ethaline + ethanol) was investigated for the first time. Ethaline, which is the mixture of choline chloride and ethylene glycol at a molar ratio of 1:2, is among the most well-known Deep Eutectic Solvents (DESs). Because of its rather low viscosities as compared to many DESs, it has gained the interest of researchers for use in different applications. In this work, isobaric densities of the mixtures of Ethaline + ethanol were measured and presented over the entire mixture concentration range within the temperature range of (293.15 – 333.15) K. Using the measured data, excess molar volumes of the mixtures were calculated and analysed. The negative values of excess molar volumes suggested the stronger interactions of hydrogen bonds in the mixture with respect to the pure states of its constituents. Additionally, partial molar volumes and excess partial molar volumes, as well as the corresponding values at infinite dilution, were calculated and analysed. It was found that both Ethaline and ethanol have the tendency to be solvated by the mutual unlike-molecule in the mixture, and this tendency is stronger for Ethaline. It is also suggested that within the established hydrogen bond networks in the mixture, the Ethaline pseudo-molecules are probably located at central positions, being mostly surrounded by ethanol molecules.

中文翻译：

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乙醇和（1 氯化胆碱 + 2 乙二醇）低共熔溶剂的非理想混合物的体积行为研究

摘要 在本研究中，首次研究了（乙醇+乙醇）混合物的体积行为。Ethaline 是氯化胆碱和乙二醇的摩尔比为 1:2 的混合物，是最著名的深共晶溶剂 (DES) 之一。由于与许多 DES 相比，它的粘度相当低，因此它引起了研究人员在不同应用中使用的兴趣。在这项工作中，在 (293.15 – 333.15) K 温度范围内的整个混合物浓度范围内测量并呈现了乙醇 + 乙醇混合物的等压密度。 使用测量数据，计算和分析混合物的过量摩尔体积. 过量摩尔体积的负值表明混合物中氢键的相互作用相对于其成分的纯态更强。此外，计算和分析了部分摩尔体积和过量部分摩尔体积，以及无限稀释时的相应值。发现Ethaline和乙醇都有被混合物中相互不同的分子溶剂化的趋势，这种趋势在Ethaline中更强。还表明在混合物中建立的氢键网络中，Ethaline 假分子可能位于中心位置，大部分被乙醇分子包围。进行了计算和分析。发现Ethaline和乙醇都有被混合物中相互不同的分子溶剂化的趋势，这种趋势在Ethaline中更强。还表明在混合物中建立的氢键网络中，Ethaline 假分子可能位于中心位置，大部分被乙醇分子包围。进行了计算和分析。发现Ethaline和乙醇都有被混合物中相互不同的分子溶剂化的趋势，这种趋势在Ethaline中更强。还表明在混合物中建立的氢键网络中，Ethaline 假分子可能位于中心位置，大部分被乙醇分子包围。