Research output: Contribution to journal › Conference article › peer-review
Electric field driven transformations of orientational structure in chiral nematic systems with large flexoelectricity. / Oskirko, A. D. ; Ul'yanov, S. V. ; Valkov, A. Yu. .
In: Journal of Physics: Conference Series, Vol. 1425, No. 1, 012176, 08.01.2020.Research output: Contribution to journal › Conference article › peer-review
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TY - JOUR
T1 - Electric field driven transformations of orientational structure in chiral nematic systems with large flexoelectricity
AU - Oskirko, A. D.
AU - Ul'yanov, S. V.
AU - Valkov, A. Yu.
PY - 2020/1/8
Y1 - 2020/1/8
N2 - Transformation of the orientational structure in a plane-parallel cell of a cholesteric liquid crystal, was studied depending on the magnitude of the voltage applied to the boundary planes of the cell. The equilibrium configuration of the liquid crystal director field was found minimizing the free energy both analitically and numerically. We took into account the orientational elastic energy in the volume and at the cell boundaries, the energy of an inhomogeneous electric field, and the flexoelectric effect. Systems with large flexoelectric coefficient were studied in detail. It was found, that when small voltages are applied to the cell boundaries, a continuous Fredericks transition occurs first, and then, when certain characteristic voltage is achieved, a significant jump-like change in the orientational structure takes place, and this structure gradually changes with the further voltage increase. It is shown that various scenarios of transformation of the orientational structure can be implemented depending on the actual values of the set of material parameters of the system studied. The discovered ability to control the structure of a liquid crystal in a cell can find use in various technical devices.
AB - Transformation of the orientational structure in a plane-parallel cell of a cholesteric liquid crystal, was studied depending on the magnitude of the voltage applied to the boundary planes of the cell. The equilibrium configuration of the liquid crystal director field was found minimizing the free energy both analitically and numerically. We took into account the orientational elastic energy in the volume and at the cell boundaries, the energy of an inhomogeneous electric field, and the flexoelectric effect. Systems with large flexoelectric coefficient were studied in detail. It was found, that when small voltages are applied to the cell boundaries, a continuous Fredericks transition occurs first, and then, when certain characteristic voltage is achieved, a significant jump-like change in the orientational structure takes place, and this structure gradually changes with the further voltage increase. It is shown that various scenarios of transformation of the orientational structure can be implemented depending on the actual values of the set of material parameters of the system studied. The discovered ability to control the structure of a liquid crystal in a cell can find use in various technical devices.
UR - https://iopscience.iop.org/issue/1742-6596/1425/1
UR - http://www.scopus.com/inward/record.url?scp=85078086544&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/1425/1/012176
DO - 10.1088/1742-6596/1425/1/012176
M3 - Conference article
VL - 1425
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012176
T2 - Modelling and Methods of Structural Analysis
Y2 - 13 November 2019 through 15 November 2019
ER -
ID: 50698526