کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5411772 | 1506582 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermophysical properties of [CN â 1C1im][PF6] ionic liquids
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Thermophysical properties of [CN â 1C1im][PF6] ionic liquids Thermophysical properties of [CN â 1C1im][PF6] ionic liquids](/preview/png/5411772.png)
چکیده انگلیسی
Densities, viscosities and refractive index, as a function of temperature, and isobaric thermal expansion coefficient, were determined for 1-alkyl-3-methylimidazolium hexafluorophosphate, [CN â 1C1im][PF6] (where N = 5 to 10) series of ionic liquids. The density presents a regular decrease along the ionic liquid series, with no detectable alkyl chain length dependence of the thermal expansion coefficient. Both the refractive index and viscosity show a trend shift along the series around the [C6C1im][PF6] that could be associated to the impact of the change in the nanostructuration of the ionic liquids. The experimental results are compared with the analogous [CN â 1C1im][NTf2] series and the effect of the anion is analyzed. The sphericity of the [PF6]â anion is reflected in the lower pre-exponential VTF parameter, Aη, and the higher viscosity of the [CN â 1C1im][PF6], when compared with the [CN â 1C1im][NTf2] series, is ruled by the higher energy barriers, which are related with stronger electrostatic interaction due to the low charge dispersion of the [PF6]â.anion.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 188, December 2013, Pages 196-202
Journal: Journal of Molecular Liquids - Volume 188, December 2013, Pages 196-202
نویسندگان
Marisa A.A. Rocha, Filipe M.S. Ribeiro, Ana I.M.C. Lobo Ferreira, João A.P. Coutinho, LuÃs M.N.B.F. Santos,