膽石醇液晶微胞的彩色電子紙研究

Cholesteric liquid crystal droplets of color electrical paper

邱 顯 鈞(Hsien-Chun Chiu)

指導教授 ： 黃振球

元智大學/工程學院/化學工程與材料科學學系/碩士(2006年)

https://doi.org/10.6838/YZU.2006.00249

摘要

本論文研究由膽石醇液晶微胞製作彩色電子紙，利用可聚合液晶混合膽石醇液晶形成的液晶複合系，在紫外光照射下，當可聚合液晶高於 10% 的重量比例，由於可聚合液晶排列於液晶結構中聚合形成模型骨架，使液晶結構穩定排列，將此複合系液晶利用乳化法形成均勻的液晶微胞，並以紫外光照射，可觀察到含有10%可聚合液晶的系統於成膜前照光聚合可將驅動電壓由6kV/cm降低為4kV/cm，可應用於降低彩色電子紙驅動電壓。使用膽石醇基團旋光性物質可誘導向列型液晶形成fingerprint texture，並以電場控制達到穿透度76%與86%間的雙安定。

關鍵字

膽石醇 ； 液晶複合系 ； 乳化法 ； 可聚合液晶 ； 雙安定

並列摘要

In this study, a composite system composed of a UV-curable liquid crystal and cholesteric liquid crystal was investigated. The liquid crystalline phase will be fixed after UV exposure when the concentration of the UV-curable liquid crystal was more than 10%. Using emulsions method formed liquid crystalline droplet including above 10% UV-curable liquid crystal. The film was UV-cured before it was air-dried. The cured film could be driving under lower driving voltage. If nematic liquid crystal was added a chiral dopant with cholesterol group, the fingerprint texture would be induced. The electro-optical effect was also studied.

並列關鍵字

Cholesteric ； liquid crystalline composite system ； Emulsion methods ； UV-curable liquid crystal ； two stable effects

參考文獻

1 R. Reinitzer, "Zur Kenntnis des Cholesterins," Monatsh. Chem. 9, 421-441 (1888).

2 O. Lehmann, "On flowing crystals," Z. Phys. Chem. 4, 462 (1889).

3 G Friedel, "The mesomorphic states of matter," Ann. Physique 18, 274-474 (1922).

7 I. Shiyanovskaya, A. Khan, S. Green et al., "Rugged and drapable cholesteric liquid crystal displays," SPIE, 204-212 (2005).

8 C. Krishnan, M. Charles, D. M. Rankin et al., "Single-substrate cholesteric liquid crystal displays by colloidal self-assembly," Appl. Phys. Lett. 88, 043502 (2006).