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Browsing VESASC by Subject "Cholesteric Liquid Crystal"

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    Determination of Wada Constant, Rao’s Constant, Compressibility and viscosity of a Cholesteric Liquid Crystal Solution at Various Temperatures
    (International Journal of Engineering Research & Technology, 2014) Kanwar, Anita; Mhatre, Pritee
    The ultrasonic waves having different frequencies propagate through the liquid crystal solution with different velocities at various temperatures. This fact helps in studying physical and chemical properties of Cholesteric liquid crystal (CLC) of different concentration at various temperatures. We in our laboratory have found out Acoustic Impedance, Rao’s constant, Adiabatic Compressibility, Wada constant, Van der Waals’ constant, Free Volume, Internal pressure and Classical Absorption Co-efficientof CLC solutionof different concentration. The measurements were made at various temperatures using Ultrasonic interferometer working at the frequencies 3MHz and 5MHz. The results so obtained are analyzed to see the effect temperature, concentration and transition of CLC into various mesophases. It is observed that when the miscibility is high and the solution is highly homogeneous the values of the parameters change drastically showing the change in the mesophases at phase transition temperatures.
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    Temperature and Concentration dependence of Refractive Index of Cholesteric Liquid Crystal Solution
    (Physical Chemistry: An Indian Journal, 2012) Kanwar, Anita; Yadav, Priya
    Average refractive indices of Cholesteric liquid crystal (Cholesteryl pelargonate: CP) dissolved in a soluble solvent were measured at various temperatures and concentrations. Multi-wavelength (visible range) refractometer made using hollow prism is used in the measurement. Due to variation in extra-ordinary and ordinary refractive index average refractive index changes with temperature for various concentrations of the solution. The changes in average refractive index were investigated for three wavelengths: 404 nm, 546 nm and 578 nm. Results so obtained are pre- sented in this paper and are in accordance with claim by Hecht in his book.