Deep eutectic solvents formed between choline chloride and carboxylic acids: Versatile alternatives to ionic liquids
Deep eutectic solvents formed between choline chloride and carboxylic acids: Versatile alternatives to ionic liquids
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DOI：
10.1021/ja048266j
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发表时间：
2004-07-28
影响因子：
15
通讯作者：
Rasheed, RK
中科院分区：
文献类型：
--
作者：
Abbott, AP;Boothby, D;Rasheed, RK
深度共熔溶剂(DES)可以在多种季铵盐和羧酸之间形成。羧酸的结构对混合物的物性有很大影响，但通过考虑混合物中羧酸的摩尔分数，可以简单地模拟混合物的相行为。这些DES的粘度、电导率和表面张力等物理性质与常温离子液体相似，并利用空穴理论对这些性质的原因进行了深入的分析。结果表明，这些液体的导电性和粘度受离子迁移率和合适尺寸的空穴的可用性控制，这与其他离子液体和熔盐的流动性是一致的。DES也是金属氧化物的良好溶剂，在金属萃取方面具有潜在的应用前景。
Deep Eutectic Solvents (DES) can be formed between a variety of quaternary ammonium salts and carboxylic acids. The physical properties are significantly affected by the structure of the carboxylic acid but the phase behavior of the mixtures can be simply modeled by taking account of the mole fraction of carboxylic acid in the mixture. The physical properties such as viscosity, conductivity, and surface tension of these DES are similar to ambient temperature ionic liquids and insight into the cause of these properties is gained using hole-theory. It is shown that the conductivity and viscosity of these liquids is controlled by ion mobility and the availability of voids of suitable dimensions, and this is consistent with the fluidity of other ionic liquids and molten salts. The DES are also shown to be good solvents for metal oxides, which could have potential application for metal extraction.