Volume 62, Number 4, May 2003
|Page(s)||526 - 532|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 May 2003|
Coupling between the nematic/isotropic transition and a thickness transition: A theoretical approach
Physique de la Matière Condensée, Collège de France, URA 792 du
CNRS 11 place Marcelin Berthelot, 75005 Paris, France
2 Centre de Recherche Paul Pascal, UPR 8641 av. du Docteur Schweitzer, 33600 Pessac, France
Corresponding author: firstname.lastname@example.org
Accepted: 20 March 2003
In this letter, we develop a theoretical model of the effect of a free surface on the nematic-to-isotropic phase transition in a confined geometry. Simply by coupling a bulk first-order phase transition with a thickness-dependent elastic distortion field in a Landau-like description, the model predicts a coexistence at equilibrium between the isotropic and the nematic phases at two different thicknesses. A phase diagram is constructed in the temperature-thickness plane and a comparison is given with experimental results obtained on thin films (van Effenterre D., Ober R., Valignat M. P. and Cazabat A. M., Phys. Rev. Lett. 87(2001) 125701).
PACS: 64.70.Md – Transitions in liquid crystals / 68.60.-p – Physical properties of thin films, nonelectronic / 61.30.Pq – Microconfined liquid crystals: droplets, cylinders, randomly confined liquid crystals, polymer dispersed liquid crystals, and porous systems
© EDP Sciences, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.