We investigated the possibility of axial escape of a nematic liquid crystal confined between two concentric cylinders with surface-imposed pure bend distortion. We found that this effect appears also in the case of strong anchoring. When the twist-anchoring is weak only at one of the surfaces, the critical thickness dc of the structure is affected by the saddle-splay elastic constant K24. Moreover, if the twist-anchoring is weak at the external surface, a transition of the first order was found, dc playing the role of an order parameter. Such a transition, characterized by bistability and hysteresis, may be driven by K24 and by the anchoring strength.
Axial Escape of Nematics in Bend Cylindrical Configuration / P., PALFFY MUHORAY; Sparavigna, Amelia Carolina; Strigazzi, Alfredo. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - ISSN 0217-9792. - 7:4(1993), pp. 1143-1156. [10.1142/S0217979293002274]
Axial Escape of Nematics in Bend Cylindrical Configuration
SPARAVIGNA, Amelia Carolina;STRIGAZZI, Alfredo
1993
Abstract
We investigated the possibility of axial escape of a nematic liquid crystal confined between two concentric cylinders with surface-imposed pure bend distortion. We found that this effect appears also in the case of strong anchoring. When the twist-anchoring is weak only at one of the surfaces, the critical thickness dc of the structure is affected by the saddle-splay elastic constant K24. Moreover, if the twist-anchoring is weak at the external surface, a transition of the first order was found, dc playing the role of an order parameter. Such a transition, characterized by bistability and hysteresis, may be driven by K24 and by the anchoring strength.Pubblicazioni consigliate
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https://hdl.handle.net/11583/1660061
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