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

Chen, Cheng
http://rave.ohiolink.edu/etdc/view?acc_num=kent1164139845

Abstract Details

2006, PHD, Kent State University, College of Arts and Sciences / Chemical Physics.
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.
Philip Bos (Advisor)
138 p.
Physics, General
Liquid crystal alignment; SiOx; inorganic alignment layer; anchoring transition; temperature dependence; thickness dependence

Recommended Citations

Citations

  • Chen, C. (2006). Anchoring Transitions of Liquid Crystals on Large Angle Deposited SiOx Thin Films [Doctoral dissertation, Kent State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=kent1164139845

    APA Style (7th edition)

  • Chen, Cheng. Anchoring Transitions of Liquid Crystals on Large Angle Deposited SiOx Thin Films. 2006. Kent State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=kent1164139845.

    MLA Style (8th edition)

  • Chen, Cheng. "Anchoring Transitions of Liquid Crystals on Large Angle Deposited SiOx Thin Films." Doctoral dissertation, Kent State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=kent1164139845

    Chicago Manual of Style (17th edition)

kent1164139845
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© 2006, all rights reserved.
This open access ETD is published by Kent State University and OhioLINK.