Transitions d'ancrage de cristaux liquides sur des films minces d'oxyde de silicium

cliquer les images pour les agrandir

"We have observed anchoring transitions of nematic liquid crystal mixtures on obliquely evaporated SiOx* by varying the relative abundance of two components in the mixture. Of these two components, one has a longitudinal cyano group and another has lateral cyano groups. Also found is that both temperature and SiOx thickness variations are able to shift the anchoring transitions. We believe that the anchoring on SiOx has two origins: long range van der Waals potential and short range surface interactions. Since the two origins have opposite preference in liquid crystal director orientation the observed transition is caused by the change of their relative strength."

Anchoring Transitions of Liquid Crystals on Large Angle Deposited SiOx Thin Films, Chen Cheng, Kent State University, College of Arts and Sciences, Department of Chemical Physics, 2006

* Oxyde de Silicium