Dielectric Insights into the Microcosmic Behavior of Ionic Liquid-Based Self-Assembly-Microemulsions/Micelles
Dielectric Insights into the Microcosmic Behavior of Ionic Liquid-Based Self-Assembly-Microemulsions/Micelles
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对离子液体基自组装微乳液/胶束微观行为的介电洞察
DOI：
10.1021/acs.jpcb.8b03024
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发表时间：
2018
影响因子：
3.3
通讯作者：
Zhao K.
中科院分区：
文献类型：
--
作者：
Zhang C.;Rao H.;Zhao K.
测量了([Bmim][BF4]/TX-100/对二甲苯)微乳液和([Bmim][BF4]/TX-100)胶束的介电弛豫光谱。在 106-108Hz 范围内观察到特定介电弛豫随离子液体 (IL) 浓度的变化。当介电参数与爱因斯坦位移方程和布鲁格曼的有效介质近似相结合时，微乳液/胶束中[Bmim][BF4]和对(1,1,3,3-四甲基丁基)苯氧基聚乙二醇(TX-100)之间的相互作用被提出：由于静电相互作用和范德华力，[Bmim][BF4]被束缚在聚环氧乙烷(PEO)链周围TX-100，一旦添加电场，[Bmim][BF4]离子将沿着PEO链移动。介电和相位参数（例如弛豫时间、介电常数和体积分数）对 IL 质量分数的依赖性为我们关于两个系统随着 IL 含量增加而转变的建议提供了证据。此外，还证实渗流是微乳液中的一种独特现象，这里的渗流机制属于静态渗流。从介电角度展示了胶束随IL含量变化的转变过程。
Dielectric relaxation spectra of ([Bmim][BF4]/TX-100/p-xylene) microemulsions and ([Bmim][BF4]/TX-100) micelles were measured. A specific dielectric relaxation changing with the concentration of ionic liquids (ILs) was observed in the range of 106–108Hz. When dielectric parameters were combined with the Einstein displacement equation and Bruggeman’s effective-medium approximation, the interaction between [Bmim][BF4] andp-(1,1,3,3-tetramethylbutyl) phenoxypolyoxyethyleneglycol (TX-100) in microemulsions/micelles was presented: because of the electrostatic interaction and van der Waals force, [Bmim][BF4] is bound around the polyethylene oxide (PEO) chains of TX-100, and once the electric field is added, ions of [Bmim][BF4] will move along the PEO chain. The dependence of dielectric and phase parameters such as relaxation time, permittivity, and volume fraction on the mass fraction of ILs presents an evidence for our proposals about the transition of both systems with the increase of IL content. In addition, it was confirmed that percolation is a unique phenomenon in microemulsions and the percolation mechanism here belongs to static percolation. The transition process of micelles with the change of IL content is presented from the dielectric view.