De Gennes Fluctuation Theory

De Gennes explained the pretransitional orientation fluctuations in nematic systems in terms of a phenomenological treatment as far as thermodynamic and structural 

The terms a, b, and c are all coefficients. The coefficient c may be negligible, and the coefficient b is nonzero only for symmetry reasons. It is the coefficient a T) that is the most important in describing the phase transition. De Gennes adopted the Landau treatment and expressed it in a scaling law  

De Gennes used a hydrodynamic approach to relate the Kerr relaxation time with the viscosity of the isotropic phase and with the thermodynamic driving force as follows  

Here we discuss the two most hotly pursued areas in the liquid-crystal industry crystal displays and electronic devices. 

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See also in sourсe #XX -- [ ]

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