温度对二甲基亚砜水溶液的结构和热力学性质的影响

doi:10.3866/PKU.WHXB20110203

物理化学学报 >> 2011, Vol. 27 >> Issue (02): 289-294.doi: 10.3866/PKU.WHXB20110203

温度对二甲基亚砜水溶液的结构和热力学性质的影响

刘波¹, 黄世萍¹, 朱吉钦², 王鹏³, 田辉平³

1. 北京化工大学纳米材料教育部重点实验室, 北京100029;
2. 北京化工大学化工资源有效利用国家重点实验室, 北京 100029;
3. 中国石油化工股份有限公司石油化工科学研究院, 北京 100083

收稿日期:2010-07-21 修回日期:2010-11-03 发布日期:2011-01-25
通讯作者: 黄世萍, 朱吉钦 E-mail:huangsp@mail.buct.edu.cn, zhujq@mail.buct.edu.cn
基金资助:
国家自然科学基金(20876005, 21076007)和国家重点基础研究发展规划项目(973) (2010CB732301)资助

Effect of Temperature on the Structural and Thermodynamic Properties of Aqueous Dimethyl Sulfoxide

LIU Bo¹, HUANG Shi-Ping¹, ZHU Ji-Qin², WANG Peng³, TIAN Hui-Ping³

1. Key Laboratory for Nanomaterials, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, P. R. China;
2. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China;
3. Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, P. R. China

Received:2010-07-21 Revised:2010-11-03 Published:2011-01-25
Contact: HUANG Shi-Ping, ZHU Ji-Qin E-mail:huangsp@mail.buct.edu.cn, zhujq@mail.buct.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (20876005, 21076007) and National Key Basic Research Program of China (973) (2010CB732301).

摘要/Abstract

摘要：

应用参考作用格位模型理论计算了二甲基亚砜(DMSO)摩尔分数为0.002时不同温度下溶液的微观结构和热力学性质. 计算结果表明, DMSO加入到水中能够增强溶液的分子网络结构. 温度升高, 配位数减小, 溶液中分子排布趋向无序. 平均力势的波动增大表明分子间的诱导力表现为斥力. 计算得到的各种热力学性质显示: 温度升高, 溶液的熵和溶剂化自由能增加, 相互作用能和过剩化学位也增加, 即高温下溶液越来越偏离理想溶液; 空位形成能降低表明溶液分子结构在高温下更容易重组.

关键词: 参考作用格位模型, 二甲基亚砜, 微观结构, 热力学性质

Abstract:

The structural and thermodynamic properties of aqueous dimethyl sulfoxide (DMSO) at a mole fraction of 0.002 were investigated using referenced interaction site model theory at different temperatures. The results reveal that the water network structure is enhanced by the presence of DMSO. The increased fluctuation in the potential of mean force suggests that the water-induced force is repulsive. In addition, the increased entropy of solvation and free energy of solvation imply that the randomness of the solution increases with an increase in temperature. The increased interaction energy and excess chemical potential reveal that the solution deviates from an ideal solution. Furthermore, the increased cavity reorganization energy shows that the system structure reorganizes easily at high temperature.

Key words: Referenced interaction site model, Dimethyl sulfoxide, Microcosmic structure, Thermodynamic property

刘波, 黄世萍, 朱吉钦, 王鹏, 田辉平. 温度对二甲基亚砜水溶液的结构和热力学性质的影响[J]. 物理化学学报, 2011, 27(02), 289-294. doi: 10.3866/PKU.WHXB20110203

LIU Bo, HUANG Shi-Ping, ZHU Ji-Qin, WANG Peng, TIAN Hui-Ping. Effect of Temperature on the Structural and Thermodynamic Properties of Aqueous Dimethyl Sulfoxide[J]. Acta Phys. -Chim. Sin. 2011, 27(02), 289-294. doi: 10.3866/PKU.WHXB20110203

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB20110203

https://www.whxb.pku.edu.cn/CN/Y2011/V27/I02/289

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温度对二甲基亚砜水溶液的结构和热力学性质的影响

Effect of Temperature on the Structural and Thermodynamic Properties of Aqueous Dimethyl Sulfoxide

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