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Abstract : The surface order transition in nematic liquid crystals is theoretically analysed. Starting from a pseudo-molecular model it is shown that the so called anchoring energy has two contributions: one coming from the nematic-nematic interaction and another one coming from the nematic substrate interaction. The two contributions have, generally, different angular dependence, and always a different temperature dependence. This fact can explain recently observed surface transitions. By using a simple phenomenological model the tilt angle versus the temperature is analysed. The agreement with the experimental data is fairly good.





Author: G. Barbero Z. Gabbasova M. Osipov

Source: https://hal.archives-ouvertes.fr/



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