Experimental Techniques and Liquid Crystal Technologies

A nematic liquid crystal is confined in a 5-pm planar liquid crystal device. If the material is observed to undergo a Freedericksz transition with the application of a 15-V potential difference across the device, calculate the splay elastic constant Xu. 

Explain how cholesteric liquid crystals can be used as a temperature sensor (liquid crystal thermometer). How how does the phase change as a function of temperature  

Describe a simple mode of operation for an LCD pixel. Use a diagram in your explanation. 

E Gleeson and L.S. Hirst, Resonant x-ray scattering a tool for structure elucidation in liquid crystals. Chem. Phys. Chem. 7, 321-328 (2006). 

Wu and D.-K. Yang, Fundamentals of Liquid Crystal Devices. Wiley Series in Display Technology. New York Wiley (2006), 

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