Stabilized electrically induced Helfrich deformation and enhanced color tuning in cholesteric liquid crystals,Soft Matter

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Stabilized electrically induced Helfrich deformation and enhanced color tuning in cholesteric liquid crystals
Soft Matter ( IF 2.9 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1039/c7sm01997a
Meina Yu _{1,

2,

3,

4,

5} , Huai Yang _{1,

2,

3,

4,

5} , Deng-Ke Yang _{6,

7,

8,

9}

Affiliation

When subjected to an AC electric field perpendicular to its layers, the cholesteric planar state may undergo a periodic layer undulation, known as the Helfrich deformation, which generates a color change of the reflected light. The Helfrich deformation of regular cholesteric liquid crystals is, however, unstable and easily taken over by the focal conic state, and thus the color tuning range is narrow. We demonstrated that the Helfrich deformation can be stabilized in a large electric field region by doping a bent dimer with an anomalously small bend elastic constant and dispersing a small amount of polymer network. By varying the dimer concentration, we were able to systematically change the bend elastic constant and thus verify the theoretical prediction of the undulation threshold electric field and periodicity. We also achieved reflectance tuning with electric field less than 2 V μm⁻¹ and color tuning covering the entire visible light region with electric field as low as 4 V μm⁻¹.

中文翻译：

胆甾醇型液晶中稳定的电感应Helfrich变形和增强的色彩调节

当受到垂直于其各层的AC电场时，胆甾型平面状态可能会经历周期性的层状起伏，称为Helfrich变形，这会产生反射光的颜色变化。然而，常规胆甾型液晶的海夫里希形变不稳定，并且容易被焦点圆锥状态所接替，因此颜色调节范围狭窄。我们证明，通过以异常小的弯曲弹性常数掺杂弯曲的二聚体并分散少量的聚合物网络，可以在较大的电场区域中稳定Helfrich变形。通过改变二聚体浓度，我们能够系统地改变弯曲弹性常数，从而验证了起伏阈值电场和周期性的理论预测。^-1和色彩调节覆盖电场低至4 Vμm^-1的整个可见光区域。

更新日期：2017-11-17

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