Anchoring Transitions of Liquid Crystals on Large Angle Deposited SiOx Thin Films

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Title:	Anchoring Transitions of Liquid Crystals on Large Angle Deposited SiOx Thin Films
Author:	Chen, Cheng
Description:	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. We found that thermal absorption-desorption of molecules on SiOx surface is important in determining the strength of short range interactions while the layer thickness and optical properties of SiOx are important to the van der Waals potential. Based on previous work by de Gennes we proposed a model to describe the observed phenomenon.
Permanent Link:	http://rave.ohiolink.edu/etdc/view?acc_num=kent1164139845 http://hdl.handle.net/2374.OX/17926
Date:	2006

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Now showing item 11 of 450