Thermophysical properties of sulfonium- and ammonium-based ionic liquids.
Thermophysical properties of sulfonium- and ammonium-based ionic liquids.
复制标题
DOI：
10.1016/j.fluid.2014.08.005
复制
发表时间：
2014-11-15
影响因子：
2.6
通讯作者：
Coutinho JA
中科院分区：
文献类型：
--
作者：
Bhattacharjee A;Luís A;Lopes-da-Silva JA;Freire MG;Carvalho PJ;Coutinho JA
在288.15 ~ 353.15K和常压下，测量了四种常见的双（三氟甲基磺酰）亚胺阴离子的锍基和铵基离子液体（ILs）的密度、粘度、折射率和表面张力。所考虑的IL包括丁基三甲基铵双（三氟甲基磺酰基）酰亚胺[N4111][NTf 2]、三丁基甲基铵双（三氟甲基磺酰基）酰亚胺[N4441][NTf 2]、二乙基甲基锍双（三氟甲基磺酰基）酰亚胺[S221][NTf 2]和三乙基锍双（三氟甲基磺酰基）酰亚胺[S222][NTf 2]。基于收集的结果和从文献中获取的数据，阳离子异构性和脂肪族尾部的大小的影响，以及由作为阳离子中心原子的硫原子取代氮所产生的效果，在这里讨论了基于锍和铵的离子液体的热物理性质。值得注意的是，更对称的阳离子对于相同的，有时甚至对于更高的阳离子烷基链长度呈现出更低的粘度。额外的衍生物的性质，如等压热膨胀系数，表面热力学性质和临界温度的调查离子液体也估计，并提出和讨论。
Experimental data for the density, viscosity, refractive index and surface tension of four sulfonium- and ammonium-based Ionic Liquids (ILs) with the common bis(trifluoromethylsulfonyl)imide anion were measured in the temperature range between 288.15 and 353.15 K and at atmospheric pressure. The ILs considered include butyltrimethylammonium bis(trifluoromethylsulfonyl)imide, [N4111][NTf2], tributylmethylammonium bis(trifluoromethylsulfonyl)imide, [N4441][NTf2], diethylmethylsulfonium bis(trifluoromethylsulfonyl)imide, [S221][NTf2], and triethylsulfonium bis(trifluoromethylsulfonyl)imide, [S222][NTf2]. Based on the gathered results and on data taken from literature, the impact of the cation isomerism and of the size of the aliphatic tails, as well as the effect resulting from the substitution of a nitrogen by a sulfur atom as the cation central atom, on the thermophysical properties of sulfonium- and ammonium-based ILs is here discussed. Remarkably, more symmetric cations present a lower viscosity for the same, and sometimes even for higher, alkyl chain lengths at the cation. Additional derivative properties, such as the isobaric thermal expansion coefficient, the surface thermodynamic properties and the critical temperature for the investigated ILs were also estimated and are presented and discussed.
登录
查看更多内容
DOI：
10.1021/je300487n
发表时间：
2012-11-01
期刊：
JOURNAL OF CHEMICAL AND ENGINEERING DATA
影响因子：
--
作者：
Almeida, Hugo F. D.;Passos, Helena;Coutinho, Joao A. P.
通讯作者：
Coutinho, Joao A. P.
影响因子：
2.6
作者：
Gardas, Ramesh L.;Coutinho, Joao A. P.
通讯作者：
Coutinho, Joao A. P.
影响因子：
4.4
作者：
Carvalho, Pedro J.;Ventura, Sonia P. M.;Coutinho, Joao A. P.
通讯作者：
Coutinho, Joao A. P.
DOI：
10.1021/je100253m
发表时间：
2010-09-01
期刊：
JOURNAL OF CHEMICAL AND ENGINEERING DATA
影响因子：
--
作者：
Carvalho, Pedro J.;Neves, Catarina M. S. S.;Coutinho, Joao A. P.
通讯作者：
Coutinho, Joao A. P.
DOI：
10.1021/je900632q
发表时间：
2010-02-01
期刊：
JOURNAL OF CHEMICAL AND ENGINEERING DATA
影响因子：
--
作者：
Carvalho, Pedro J.;Regueira, Teresa;Coutinho, Joao A. P.
通讯作者：
Coutinho, Joao A. P.