离子液体
粘度
热的
热膨胀
离子键合
化学
热力学
化学工程
材料科学
有机化学
离子
物理
催化作用
工程类
作者
Anabela J. L. Costa,Mário R. C. Soromenho,Karina Shimizu,Isabel M. Marrucho,José M. S. S. Esperança,José N. Canongia Lopes,Luís Paulo N. Rebelo
出处
期刊:ChemPhysChem
[Wiley]
日期:2012-02-28
卷期号:13 (7): 1902-1909
被引量:86
标识
DOI:10.1002/cphc.201100852
摘要
Abstract Density and viscosity data of the N‐alkyl‐ N , N ‐dimethyl‐ N ‐(2‐hydroxyethyl)ammonium bis(trifluoromethylsulfonyl)imide ionic liquids homologous series [N 1 1 n 2(OH) ][Ntf 2 ] with n =1, 2, 3, 4 and 5 have been measured at atmospheric pressure in the 283< T / K <373 temperature range and the corresponding isobaric thermal expansion coefficients have been calculated. This work studies the effect of increasing the alkyl chain length of the cholinium‐based cation on the density, viscosity and related properties of this family of ionic liquids. A volumetric predictive method based on the effective molar volume of cations and anions is used to estimate the effective molar volume of the different cations present in this study. The results agree with data for other cation families that show a molar volume increment per CH 2 group on the alkyl chain of the cation of about 17.2 cm 3 mol −1 , except for [N 1 1 1 2(OH) ] + , which exhibits an outlier behaviour. Molecular dynamics simulation results are used to explain the volumetric behaviour along the homologous series from a molecular perspective. The predictive power of group contribution methods for density and viscosity is also tested.
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