PDF(Pubmed)
Abstract：
Deep eutectic solvents (DESs) are complex substances composed of two or three components, wherein hydrogen bond donors and acceptors engage in intricate interactions within a hydrogen bond network. They have attracted extensive attention from researchers due to their easy synthesis, cost-effectiveness, broad liquid range, good stability, and for being green and non-toxic. However, studies on the physical properties of DESs are still scarce and many theories are not perfect enough, which limits the application of DESs in engineering practice. In this study, twelve DESs were synthesized by using choline chloride and betaine as HBAs, and ethylene glycol, polyethylene glycol 600, o-cresol, glycerol, and lactic acid as HBDs. The variation rules of their thermal conductivity and viscosity with temperature at atmospheric pressure were systematically investigated. The experimental results showed that the thermal conductivity of the 1:4 choline chloride/glycerol solvent was the largest at 294 K, reaching 0.2456 W·m-1·K-1, which could satisfy the demand for high efficiency heat transfer by heat-transferring workpieces. The temperature-viscosity relationship of the DESs was fitted using the Arrhenius model, and the maximum average absolute deviation was 6.77%.
摘要：
低共熔溶剂（DESs）是由两种或三种成分组成的复杂物质，其中氢键供体和受体参与氢键网络内的复杂相互作用。它们由于易于合成而引起了研究者的广泛关注,成本效益，广泛的液体范围，稳定性好,绿色无毒。然而,关于DES物理性质的研究仍然很少，许多理论还不够完善，这限制了DES在工程实践中的应用。在这项研究中,以氯化胆碱和甜菜碱为HBA合成了12种DES，和乙二醇，聚乙二醇600,邻甲酚,甘油，和乳酸作为HBDs。系统研究了其热导率和粘度随大气压力温度的变化规律。实验结果表明，1:4氯化胆碱/甘油溶剂的热导率在294K时最大，达到0.2456W·m-1·K-1，可以满足传热工件对高效传热的需求。使用Arrhenius模型拟合了DES的温度-粘度关系，最大平均绝对偏差为6.77%。
