Generation of the pretilt angle in nematic liquid crystal (NLC) with negative dielectric anisotropy and cyano (CN) mixtures on a rubbed polyimide (PI) surface was studied. The pretilt angle of negative type NLC generated was larger than that of the positive type NLC on the rubbed PI surface for homogeneous alignment. However, the pretilt angle of negative type NLC generated was lower than that of the positive type NLC on the rubbed PI surface for homeotropic alignment. The different mechanisms of LC pretilt angle for homeotropic and homogeneous alignment can be observed. The pretilt angle increases with cyano content on the rubbed PI surface for homogeneous alignment and then saturates with further addition.
|Journal||Molecular Crystals and Liquid Crystals|
|Publication status||Published - 2004|
|Event||Proceedings of the 19th International Liquid Crystal Conference, ILCC2002 - Edinburgh, United Kingdom|
Duration: 2002 Jun 30 → 2002 Jul 5
Bibliographical noteFunding Information:
Keywords: cyano LC; homeotropic alignment; negative dielectric anisotropy; nematic liquid crystal (NLC); pretilt angle This work was supported by National Research Laboratory program (M1-0203-00-0008). Address correspondence to Dae-Shik Seo, Dept. of Electrical and Electronic Engineering (C-724), College of Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-ku, Seoul 120-749, Korea.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics