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Abstract : We consider a solid-nematic interface where long range van der Waals torques favor homeotropic alignment, while a direct steric effect tends to induce a planar alignment. Depending on the relative strength of the two contributions, one may find two transitions : planar ↔ conical and conical ↔ homeotropic. This is reminiscent of recent observations by Ryschenkow and Kléman on glass surfaces coated with carbon black. Similar local Frederiks transitions could occur by competition between two distinct planar arrangments.

Keywords : interface phenomena liquid crystal phase transformations Frederiks transitions long range van der Waals torques homeotropic alignment direct steric effect planar alignment local transitions solid nematic surface planar conical transitions conical homeotropic transitions





Autor: E. Dubois-Violette P.G. De Gennes

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



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