Yingying Zuo, Yueheng Xuan, Yixuan Wang and Jing Tong*,
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引用次数: 0
Abstract
Deep eutectic solvents (DESs) are new green solvents, and quaternary ammonium salt acid DESs have been widely used in the field of analytical separation in recent years due to their low cost and environmental friendliness. In this work, the density, viscosity, and electrical conductivity of binary mixtures containing three quaternary ammonium salt–(dl)-lactic acid DESs with H2O were determined. The average molar volume, excess molar volume, and viscosity deviation of the DESs’ aqueous solutions trends were computed. The viscous flow activation energy of DESs’ aqueous solutions was derived using the Arrhenius equation. The DESs’ physical properties are significantly influenced by their structure, temperature, and water content. The excess molar volume and viscosity deviation are negative over the entire concentration range, indicating a strong interaction between DESs and water. The variation of viscosity and electrical conductivity of the binary system with temperature conforms to the Vogel–Fulcher–Tammann (VFT) equation and shows an opposite trend, i.e., viscosity decreases and electrical conductivity increases with increasing temperature. The VFT equation can be conveniently applied to the aqueous solutions of DESs.
深共晶溶剂(DES)是一种新型的绿色溶剂,近年来,季铵盐酸性DES因其低成本和环保性在分析分离领域得到了广泛应用。本研究测定了含有三种季铵盐-(dl)-乳酸 DES 与 H2O 的二元混合物的密度、粘度和电导率。计算了 DESs 水溶液趋势的平均摩尔体积、过量摩尔体积和粘度偏差。利用阿伦尼乌斯方程得出了 DESs 水溶液的粘流活化能。DESs 的物理性质受其结构、温度和含水量的影响很大。在整个浓度范围内,过剩摩尔体积和粘度偏差均为负值,这表明 DESs 与水之间存在很强的相互作用。二元体系的粘度和电导率随温度的变化符合 Vogel-Fulcher-Tammann (VFT)方程,并呈现出相反的趋势,即随着温度的升高,粘度降低,电导率升高。VFT 方程可方便地应用于 DES 的水溶液。
期刊介绍:
The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.