Interaction and microstructure in the binary mixture systems of ionic liquid and acetone by dielectric spectroscopy
Interaction and microstructure in the binary mixture systems of ionic liquid and acetone by dielectric spectroscopy
复制标题
介电谱研究离子液体和丙酮二元混合物体系中的相互作用和微观结构
DOI：
10.1016/j.molliq.2016.04.026
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发表时间：
2016-08
影响因子：
6
通讯作者：
Zhao Kongshuang
中科院分区：
文献类型：
--
作者：
Ma Liyan;Yang Man;Zhao Kongshuang
采用介电弛豫谱研究了离子液体（IL）和丙酮组成的两个二元混合体系，1-丁基-3-甲基咪唑四氟硼酸盐（[bmim][BF 4]）/丙酮体系和1-丁基-3-甲基咪唑六氟磷酸盐（[bmim][PF 6]）/丙酮体系。分别在1-10 GHz和20 GHz附近观察到两个显著的弛豫。本文主要研究了离子液体（IL）取向极化引起的低频弛豫现象。低频弛豫的介电增量Δε和弛豫时间τ随丙酮浓度的变化关系在丙酮质量分数为60%（[bmim][PF 6]/丙酮）和70%（[bmim][BF 4]/丙酮）时出现突变。拐点反映了IL/丙酮二元混合物微观结构的变化。此外，基于介电参数，离子缔合，离子溶剂化和离子电导率也进行了研究。结果表明，丙酮分子主要与离子液体的阳离子发生相互作用。
We present a dielectric relaxation spectroscopy study on two binary mixture systems composed of ionic liquids (ILs) and acetone, i.e., 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4])/acetone system and 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6])/acetone system, respectively. Two significant relaxations were observed around 1–10 GHz and 20 GHz, respectively. The low-frequency relaxation, whose mechanism was from the orientation polarization of ionic liquid (IL), was mainly studied in this paper. The acetone concentration dependencies of the dielectric increment Δεand relaxation timeτfor low-frequency relaxation presented an abrupt change at the acetone mass fraction of 60% for [bmim][PF6]/acetone and 70% for [bmim][BF4]/acetone. The inflection points reflected the change in the micro-structure of the IL/acetone binary mixture. Moreover, based on the dielectric parameters, the ion association, ion solvation and ion conductivity were also investigated. The result shows that the acetone molecules mainly interact with the cation of ILs.
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DOI：
10.1002/9780470938416
发表时间：
1986-01
期刊：
--
影响因子：
--
作者：
J. Zemaitis;D. Clark;Marshall Rafal;N. C. Scrivner
通讯作者：
J. Zemaitis;D. Clark;Marshall Rafal;N. C. Scrivner
影响因子：
4.9
作者：
F. Stieber;H. Waldmann
通讯作者：
F. Stieber;H. Waldmann
影响因子：
4.4
作者：
Cole, KS;Cole, RH
通讯作者：
Cole, RH
影响因子：
3.3
作者：
Hunger, Johannes;Stoppa, Alexander;Hefter, Glenn
通讯作者：
Hefter, Glenn
影响因子：
2.9
作者：
Hunger, Johannes;Stoppa, Alexander;Buchner, Richard
通讯作者：
Buchner, Richard