Solid State Physics

Adsorption phenomena and anchoring energy in nematic liquid by Giovanni Barbero, Luiz Roberto Evangelista

By Giovanni Barbero, Luiz Roberto Evangelista

Regardless of the big volume of phenomenological details about the bulk homes of nematic part liquid crystals, little is known concerning the foundation of the outside power, relatively the outside, interfacial, and anchoring houses of liquid crystals that impact the functionality of liquid crystal units. Self-contained and designated, Adsorption Phenomena and Anchoring strength in Nematic Liquid Crystals offers an account of latest and tested effects spanning 3 many years of analysis into the issues of anchoring power and adsorption phenomena in liquid crystals. The publication features a exact dialogue of the beginning and attainable assets of anchoring power in nematic liquid crystals, emphasizing the dielectric contribution to the anchoring strength particularly. starting with basic floor and anchoring houses of liquid crystals and the definition of the nematic part, the authors clarify how selective ion adsorption, dielectric strength density, thickness dependence, and bias voltage dependence effect the uniform alignment of liquid crystals and have an effect on the functionality of liquid crystal units. additionally they talk about basic equations regulating the adsorption phenomenon and the dynamic elements of ion adsorption phenomenon in liquid crystalline structures. Adsorption Phenomena and Anchoring strength in Nematic Liquid Crystals serves as a great resource of reference for graduates and researchers operating in liquid crystals, complicated fluids, condensed subject physics, statistical physics, chemical engineering, and digital engineering, in addition to offering an invaluable basic advent to and history info at the nematic liquid crystal section.

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Order phase transition near the inversion point of main anisotropy. Modern Physics Letters B, 4, 751 (1990). [24] Barbero G, Evangelista LR, and Gabbasova Z. Fr´eedericksz-like transitions in compensated nematic liquid crystals. International Journal of Modern Physics B, 5, 697 (1991). [25] Barbero G, Evangelista LR, and Krekhov AP. Tricritical point in orderdisorder phase transitions for nematics. International Journal of Modern Physics B, 6, 2521 (1992). [26] Jerome B. Surface effects and anchoring in liquid crystals.

19] Deloche B and Cabane B. Coupling of hydrogen-bonding to orientational fluctuation modes in liquid-crystal PHBA. Molecular Crystals and Liquid Crystals, 19, 25 (1972). [20] Petrov MP, Anachkova E, Kirov N, Ratajczak H, and Baran J. IR spectroscopic investigations of peculiar behavior of 4,n-alkoxybenzoic acids in their mesomorphic state–nonligned samples. Journal of Molecular Liquids, 61, 221 (1994). [21] Barbero G, Evangelista LR, and Petrov MP. Influence of the dimerization process on the nematic ordering.

Consequently, from Eq. 61) we obtain a= The quantity a − = ⊥ a and b = = a ni nj + =2 ⊥ + ⊥. is called dielectric anisotropy. Hence ij ii ij , from Eq. 63) and the dielectric energy appearing in Eq. 59) becomes 1 2 ij Ei Ej = 1 2 a (n · E)2 + 1 2 ⊥E 2 . 65) plays the role of a polarization induced by the deformation. 65) is the equivalent of the electric polarization in a piezoelectric material. The quantities eijk are the components of the flexoelectric tensor e. 66) where we have taken into account that eijk must be odd in n.

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