Temperature and pressure dependence of the viscosity of the ionic liquids 1-methyl-3-octylimidazolium hexafluorophosphate and 1-methyl-3-octylimidazolium tetrafluoroborate
Temperature and pressure dependence of the viscosity of the ionic liquids 1-methyl-3-octylimidazolium hexafluorophosphate and 1-methyl-3-octylimidazolium tetrafluoroborate
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DOI：
10.1021/je060082s
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发表时间：
2006-05-11
期刊：
影响因子：
--
通讯作者：
Woolf, LA
中科院分区：
文献类型：
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作者：
Harris, KR;Kanakubo, M;Woolf, LA
用落体粘度计测量了离子液体1-甲基-3-辛基咪唑六氟磷酸盐、[OMIM]PF6和1-甲基-3-辛基咪唑四氟硼酸盐[OMIM]BF4在(0~80)℃、176 Mpa([OMIM]PF6)和224 Mpa([OMIM]BF4)压力下的粘度。总体不确定度估计为+/-(2至3)%。修正的Litovitz方程和Vogel-Fulcher-Tammann方程被用来描述温度和压力的关系。发现后者的T-0参数符合Angell关于T-0和强度参数D与玻璃温度T-g的关系。这两种物质在大气压下的密度也都在(0至90摄氏度)之间。这些物质的总不确定度估计为+/-0.00005克。Cm(-3)。Anton-Paar DMA5000密度计的内置粘度校正是使用高粘度参考标准确认的，上限为16Pa.S。
The viscosities of the ionic liquids 1-methyl-3-octylimidazolium hexafluorophosphate, [ OMIM] PF6, and 1-methyl-3-octylimidazolium tetrafluoroborate [OMIM] BF4, have been measured between (0 and 80) degrees C and at pressures to 176 MPa ([OMIM] PF6) and 224 MPa ([OMIM] BF4) with a falling-body viscometer. The overall uncertainty is estimated at +/- ( 2 to 3) %. Modified Litovitz and Vogel-Fulcher-Tammann equations are used to represent the temperature and pressure dependence. The T-0 parameter for the latter is found to be consistent with Angell's relationship linking T-0 and the strength parameter D with the glass temperature T-g. Densities between (0 and 90) degrees C at atmospheric pressure are also reported for both substances. These have an overall uncertainty estimated at +/- 0.00005 g . cm(-3). The in-built viscosity correction for the Anton-Paar DMA5000 densimeter was confirmed using high-viscosity reference standards to an upper limit of 16 Pa . s.