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论文类型：期刊论文

发表时间：2014-02-01

发表刊物：CHINESE JOURNAL OF CHEMICAL ENGINEERING

收录刊物：SCIE、EI、ISTIC、Scopus

卷号：22

期号：2

页面范围：153-163

ISSN号：1004-9541

关键字：molecular dynamics simulation; carbon dioxide; ionic liquids; diffusion; microstructure

摘要：Molecular dynamics simulation with an all-atom force field has been carried out on the two binary systems of [bmim][PF6]-CO2 and [bmim][NO3]-CO2 to study the transport properties, volume expansion and microstructures. It was found that addition of CO2 in the liquid phase can greatly decrease the viscosity of ionic liquids (ILs) and increase their diffusion coefficient obviously. Furthermore, the volume expansion of ionic liquids was found to increase with the increase of the mole fraction of CO2 in the liquid phase but less than 35% for the two simulated systems, which had a significant difference with CO2 expanded organic solvents. The main reason was that there were some void spaces inter and intra the molecules of ionic liquids. Finally, site to site radial distribution functions and corresponding number integrals were investigated and it was found that the change of microstructures of ILs by addition CO2 had a great influence on the properties of ILs.