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Charge-Induced Birefringence in a Room-Temperature Ionic Liquid
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2021-01-19 , DOI: 10.1021/acs.jpcb.0c10045
Yufeng Wang 1 , Greg M. Swain 1 , G. J. Blanchard 1
Affiliation  

We have reported previously on the existence of a surface charge-induced free charge density gradient (ρf) in room-temperature ionic liquids (RTILs) with a characteristic persistence length of ca. 50 μm [Ma, K. Langmuir 2016, 32, 9507−9512]. The free charge density gradient is related to the dielectric response of the RTIL. We report here on the existence of a surface charge-induced gradient in the RTIL refractive index and quantify the relationship between the index gradient and ρf. Because ρf is uniaxial, the induced refractive index gradient is manifested as an induced birefringence. The RTIL sample holder has a curved surface such that the RTIL can function as a lens, and ρf is controlled by the surface charge density (σs) of the (concave) RTIL support. Current passed through an indium-doped tin oxide (ITO) surface layer on the support surface controls σs. The far-field image of light passed through the RTIL lens as a function of σs is used to measure the charge-induced changes of n in the RTIL. We demonstrate a modulation of the refractive index on the order of 15%, proportional to σs. This report places the relationship between ρf and RTIL dielectric response on a quantitative footing and suggests the utility of RTILs for electro-optic applications.

中文翻译:

室温离子液体中的电荷诱导双折射

我们已经在表面电荷引起的自由电荷密度梯度(ρ的存在先前报道˚F用约的特性持续长度在室温离子液体(离子液体))50微米[马K 朗缪尔 2016 32,9507-9512]。自由电荷密度梯度与RTIL的介电响应有关。在这里,我们报告中RTIL折射率的表面电荷引入的梯度的存在和量化指标梯度和ρ之间的关系˚F。因为ρ ˚F是单轴,感应折射率梯度表现为一个引起的双折射。所述RTIL样本保持器具有弯曲表面,使得可以RTIL作为透镜发挥作用,ρ ˚F由表面电荷密度(σ控制小号的(凹的)RTIL支持的)。电流通过的铟掺杂的氧化锡传递(ITO)表面上的支撑表面的控制σ层小号。的光通过透镜RTIL作为σ的函数传递远场图像小号被用于测量的电荷引起的变化Ñ在RTIL。我们证明的15%的数量级上的折射率的调制,正比于σ小号。此报告放置ρ之间的关系˚F上的定量基础和RTIL介电响应,并建议的RTIL用于电光应用的效用。
更新日期:2021-01-28
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