Light-radiation-induced non-volatile change in the liquid crystal orientation in the vicinity of its contact with a conductor
Kucheev S. I.1, Virchenko Yu. P.2
1Belgorod National Research University, Belgorod, Russia
2Belgorod State Technology University named after V.G. Shukhov, Belgorod, Russia
Email: skucheev@bsuedu.ru
The study has shown experimentally that, when the contact between the conductor (Cu) and liquid crystal (nematic 5CB) is exposed to light radiation (from an incandescent lamp or low-power He-Ne laser with λ=0.63 μm), a change in the initial orientation of liquid crystal molecules takes place in the vicinity of the meniscus. It has been established that reorientation of molecules is non-stationary in character with pronounced time periods of increase and relaxation in the size of the liquid crystal deformation region. The characteristic time corresponding to the maximum deformation ranges within several seconds. We assume that the observed meniscus change with which we associate the reorientation of molecules is caused by variation in the liquid crystal surface tension due to electron photoemission into the liquid crystal from the conductor during its irradiation. Keywords: conductor-liquid crystal contact, surface tension, electrowetting, electron photoemission.
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