Etude des smectiques chiraux
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Les cristaux liquides constituent des mat�riaux d'exception alliant fluidit� et anisotropie, essentiels aux technologies d'affichage. Ce travail se concentre sp�cifiquement sur les smectiques chiraux, dont l'int�r�t a explos� apr�s la d�couverte par R. B. Meyer en 1975 de leurs propri�t�s ferro�lectriques. Cette caract�ristique, n�e de la brisure de sym�trie dans les phases inclin�es (tilt�es) et chirales, permet d'obtenir des dispositifs �lectro-optiques � r�ponse ultra-rapide et dot�s d'un effet m�moire (bistabilit�), surpassant les limites des cristaux liquides n�matiques classiques.L'�tude s'articule autour de la compr�hension des transitions de phases par l'�tablissement de diagrammes (Champ �lectrique - Temp�rature). L'originalit� de la d�marche r�side dans l'utilisation de la th�orie du continuum pour mod�liser l'�nergie libre des diff�rentes m�sophases. Par une double approche de calcul analytique et de mod�lisation num�rique, les r�sultats th�oriques sont confront�s aux donn�es exp�rimentales. Cette analyse met en lumi�re l'influence d�terminante d'un champ �lectrique ext�rieur sur l'organisation des smectiques chiraux tilt�s.
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