14 research outputs found
Effect of ZnO nanoparticles on the morphology, dielectric, electro-optic and photo luminescence properties of a confined ferroelectric liquid crystal material
No full text
Dielectric and polarization switching studies in nickel nanoparticles dispersed ferroelectric liquid crystal mixtures
No full textImpact of dye on the switching responses of polymer dispersed ferroelectric liquid crystal
No full textGeometry Controlled Oscillations in Liquid Crystal Polymer Films Triggered by Thermal Feedback
No full textLight-induced oscillatory behavior of liquid crystal
polymer network
(LCN) films has been demonstrated by several researchers in the past
decade. Similarly, oscillations in LCN films under constant thermal
stimulus have been reported recently, although the mechanism and the
factors that govern the oscillatory behavior are not well understood.
In this work, we study the dynamics of self-sustained oscillations
exhibited by LCN films under a constant thermal stimulus through experiments
and simulations. Geometrically asymmetric films such as a right triangle
and an equilateral triangle are obtained from a twisted nematic square
film. A multiphysics computational framework using the finite element
method is developed to simulate the oscillatory behavior of the LCN
films kept on a hot plate. The framework accounts for a coupling between
heat transfer and mechanical deformations during the oscillations.
Small temperature fluctuations (≈ 1 °C) coupled with gravity
induced torque are shown to drive the oscillatory behavior at a specific
plate temperature. We show for the first time that self-sustained
oscillations can also be achieved in symmetric shapes, such as square
films, by creating a thickness tapering between two opposite edges.
The frequency of the oscillations is found to be in the range of 0.5
to 2.5 Hz for different geometries studied. The oscillation temperature
depends on the mean thickness, size, and thickness profile of the
films. As a possible application, we demonstrate a thermally actuated
optical chopper using the oscillatory response of the films
Geometry Controlled Oscillations in Liquid Crystal Polymer Films Triggered by Thermal Feedback
No full textLight-induced oscillatory behavior of liquid crystal
polymer network
(LCN) films has been demonstrated by several researchers in the past
decade. Similarly, oscillations in LCN films under constant thermal
stimulus have been reported recently, although the mechanism and the
factors that govern the oscillatory behavior are not well understood.
In this work, we study the dynamics of self-sustained oscillations
exhibited by LCN films under a constant thermal stimulus through experiments
and simulations. Geometrically asymmetric films such as a right triangle
and an equilateral triangle are obtained from a twisted nematic square
film. A multiphysics computational framework using the finite element
method is developed to simulate the oscillatory behavior of the LCN
films kept on a hot plate. The framework accounts for a coupling between
heat transfer and mechanical deformations during the oscillations.
Small temperature fluctuations (≈ 1 °C) coupled with gravity
induced torque are shown to drive the oscillatory behavior at a specific
plate temperature. We show for the first time that self-sustained
oscillations can also be achieved in symmetric shapes, such as square
films, by creating a thickness tapering between two opposite edges.
The frequency of the oscillations is found to be in the range of 0.5
to 2.5 Hz for different geometries studied. The oscillation temperature
depends on the mean thickness, size, and thickness profile of the
films. As a possible application, we demonstrate a thermally actuated
optical chopper using the oscillatory response of the films
Geometry Controlled Oscillations in Liquid Crystal Polymer Films Triggered by Thermal Feedback
No full textLight-induced oscillatory behavior of liquid crystal
polymer network
(LCN) films has been demonstrated by several researchers in the past
decade. Similarly, oscillations in LCN films under constant thermal
stimulus have been reported recently, although the mechanism and the
factors that govern the oscillatory behavior are not well understood.
In this work, we study the dynamics of self-sustained oscillations
exhibited by LCN films under a constant thermal stimulus through experiments
and simulations. Geometrically asymmetric films such as a right triangle
and an equilateral triangle are obtained from a twisted nematic square
film. A multiphysics computational framework using the finite element
method is developed to simulate the oscillatory behavior of the LCN
films kept on a hot plate. The framework accounts for a coupling between
heat transfer and mechanical deformations during the oscillations.
Small temperature fluctuations (≈ 1 °C) coupled with gravity
induced torque are shown to drive the oscillatory behavior at a specific
plate temperature. We show for the first time that self-sustained
oscillations can also be achieved in symmetric shapes, such as square
films, by creating a thickness tapering between two opposite edges.
The frequency of the oscillations is found to be in the range of 0.5
to 2.5 Hz for different geometries studied. The oscillation temperature
depends on the mean thickness, size, and thickness profile of the
films. As a possible application, we demonstrate a thermally actuated
optical chopper using the oscillatory response of the films
