Thermophysical properties of binary mixtures of {ionic liquid 2-hydroxy ethylammonium acetate plus (water, methanol, or ethanol)}
Thermophysical properties of binary mixtures of {ionic liquid 2-hydroxy ethylammonium acetate plus (water, methanol, or ethanol)}
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DOI：
10.1016/j.jct.2011.01.014
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发表时间：
2011-07-01
影响因子：
2.6
通讯作者：
Iglesias, Miguel
中科院分区：
文献类型：
--
作者：
Alvarez, Victor H.;Mattedi, Silvana;Iglesias, Miguel
在这项工作中，密度和速度。在大气压下，从（288.15 ~ 323.15）K的温度范围内，测量了由2-羟乙基乙酸铵（2-HEAA）+（水、甲醇或乙醇））组成的离子液体二元混合物在整个浓度范围内的声数据。根据实验数据计算了体系的超额摩尔体积、等熵压缩系数、表观摩尔体积、等熵表观摩尔压缩系数和热膨胀系数的变化。在整个组成范围内，过量摩尔体积均为负值。结合低角X-射线散射和NMR测量的可压缩性数据证明，胶束的存在下形成的离子对相互作用的混合物中的离子液体的临界浓度以上。采用Peng-Robinson状态方程，结合Wong-Sandler混合规则和COSMO-SAC模型，对二元混合物的密度进行了预测，计算结果与实验值的偏差均小于3%. (C)2011爱思唯尔有限公司保留所有权利。
In this work, density and speed. of sound data of binary mixtures of an ionic liquid consisting of (2-hydroxy ethylammonium acetate (2-HEAA) + (water, methanol, or ethanol)) have been measured throughout the entire concentration range, from the temperature of (288.15 to 323.15) K at atmospheric pressure. The excess molar volumes, variations of the isentropic compressibility, the apparent molar volume, isentropic apparent molar compressibility, and thermal expansion coefficient were calculated from the experimental data. The excess molar volumes were negative throughout the whole composition range. Compressibility data in combination with low angle X-ray scattering and NMR measurements proved that the presence of micelles formed due to ion pair interaction above a critical concentration of the ionic liquid in the mixtures. The Peng-Robinson equation of state coupled with the Wong-Sandler mixing rule and COSMO-SAC model was used to predict densities and the calculated deviations were lower than 3%, for binary mixtures in all composition range. (C) 2011 Elsevier Ltd. All rights reserved.