Abstract
Abstract
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°.
Funder
Merck Chemicals Ltd.
Engineering and Physical Sciences Research Council
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials
Cited by
3 articles.
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