Frequency-controlled dielectrophoresis-driven wetting of nematic liquid crystals
We show that surface-localized dielectrophoresis-driven wetting of anisotropic nematic liquid crystal sessile droplets obeys the same relationship, cos [ θ ( V o ) ] = cos [ θ Y ] − β V o 2 , which has previously been found for isotropic liquid droplets, even though the nematic liquid crystal phase...
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Veröffentlicht in: | Journal of physics. D, Applied physics Applied physics, 2022-07, Vol.55 (28), p.285302 |
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Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
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Zusammenfassung: | We show that surface-localized dielectrophoresis-driven wetting of anisotropic nematic liquid crystal sessile droplets obeys the same relationship,
cos
[
θ
(
V
o
)
]
=
cos
[
θ
Y
]
−
β
V
o
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
θ
Y
to
θ
V
o
, through the action of a potential difference
V
o
, 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
V
o
−
θ
Y
exceeds 3°–4°. |
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ISSN: | 0022-3727 1361-6463 |
DOI: | 10.1088/1361-6463/ac6466 |