Exploring the electro-optic response of stabilized cholesteric liquid crystals containing a non-liquid crystalline polymer network

2021 ◽  
Author(s):  
Brian P. Radka ◽  
Timothy J. White
Keyword(s):  
Liquid Crystals ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Polymer Network ◽  
Crystalline Polymer ◽  
Cholesteric Liquid Crystals ◽  
Electro Optic

Humidity-Responsive Bilayer Actuators Based on a Liquid-Crystalline Polymer Network

2013 ◽  
Vol 5 (11) ◽  
pp. 4945-4950 ◽  
Author(s):  
Mian Dai ◽  
Olivier T. Picot ◽  
Julien M. N. Verjans ◽  
Laurens T. de Haan ◽  
Albertus P. H. J. Schenning ◽  
...  
Keyword(s):  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Polymer Network ◽  
Crystalline Polymer

scholarly journals Engineering the anchoring behavior of nematic liquid crystals on a solid surface by varying the density of liquid crystalline polymer brushes

Soft Matter ◽  
2018 ◽  
Vol 14 (37) ◽  
pp. 7569-7577 ◽  
Author(s):  
Xiao Li ◽  
Takuya Yanagimachi ◽  
Camille Bishop ◽  
Coleman Smith ◽  
Moshe Dolejsi ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Solid Surface ◽  
Polymer Brushes ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Nematic Liquid Crystals ◽  
Crystalline Polymer

Using liquid crystalline polymer brushes to continuously control the anchoring transition of 5CB by simply varying the brush density.

scholarly journals Effect of Cell Thickness on the Electro-optic Response of Polymer Stabilized Cholesteric Liquid Crystals with Negative Dielectric Anisotropy

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 746 ◽  
Author(s):  
Kyung Min Lee ◽  
Ecklin P. Crenshaw ◽  
Mariacristina Rumi ◽  
Timothy J. White ◽  
Timothy J. Bunning ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Field Strength ◽  
Polymer Network ◽  
Dielectric Anisotropy ◽  
Cholesteric Liquid Crystals ◽  
Colored State ◽  
Electro Optic ◽  
Dc Electric Field ◽  
Polymer Stabilized ◽  
Cell Thickness

It has previously been shown that for polymer-stabilized cholesteric liquid crystals (PSCLCs) with negative dielectric anisotropy, the position and bandwidth of the selective reflection notch can be controlled by a direct-current (DC) electric field. The field-induced deformation of the polymer network that stabilizes the devices is mediated by ionic charges trapped in or near the polymer. A unique and reversible electro-optic response is reported here for relatively thin films (≤5 μm). Increasing the DC field strength redshifts the reflection notch to longer wavelength until the reflection disappears at high DC fields. The extent of the tuning range is dependent on the cell thickness. The transition from the reflective to the clear state is due to the electrically controlled, chirped pitch across the small cell gap and not to the field-induced reorientation of the liquid crystal molecules themselves. The transition is reversible. By adjusting the DC field strength, various reflection wavelengths can be addressed from either a different reflective (colored) state at 0 V or a transparent state at a high DC field. Relatively fast responses (~50 ms rise times and ~200 ms fall times) are observed for these thin PSCLCs.

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