Frequency-controlled dielectrophoresis-driven wetting of nematic liquid crystals

Brown, C. ORCID: 0000-0002-1559-3238, Bhadwal, A. ORCID: 0000-0002-6700-2604, Edwards, A., Sage, I., Saxena, A. and Mottram, N., 2022. Frequency-controlled dielectrophoresis-driven wetting of nematic liquid crystals. Journal of Physics D: Applied Physics, 55 (28): 285302. ISSN 0022-3727

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Abstract

We show that surface-localized dielectrophoresis-driven wetting of anisotropic nematic liquid crystal sessile droplets obeys the same relationship, cos⁡[θ(Vo)]=cos⁡[θy]-β(Vo^2), which has previously been found for isotropic liquid droplets, even though the nematic liquid crystal phase possesses a uniaxial dielectric permittivity tensor. We also demonstrate that the dielectrowetting coefficient β, which determines the magnitude of the reduction in the contact angle, from θy to θ(Vo ), through the action of a potential difference Vo, can be controlled by the frequency of the applied voltage between interdigitated electrodes beneath a droplet of highly dispersive nematic liquid crystal. Our Q-tensor modelling of the electric field-induced 2-dimensional n-director distortions within a nematic droplet elucidates how this linear relationship holds for voltages when |θ(Vo )-θy| exceeds 3-4 degrees.

Item Type: Journal article
Publication Title: Journal of Physics D: Applied Physics
Creators: Brown, C., Bhadwal, A., Edwards, A., Sage, I., Saxena, A. and Mottram, N.
Publisher: IOP Publishing
Date: 2022
Volume: 55
Number: 28
ISSN: 0022-3727
Identifiers:
NumberType
10.1088/1361-6463/ac6466DOI
1535805Other
Rights: © 2022 the author(s). Published by IOP Publishing Ltd. Accepted Manuscript is available for reuse under a CC BY 3.0 licence.
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 12 Apr 2022 12:00
Last Modified: 25 Apr 2022 07:57
URI: http://irep.ntu.ac.uk/id/eprint/46110

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