標題: Novel asymmetrical single- and double-chiral liquid crystal diads with wide blue phase ranges
作者: Wei, Chong-Lun
Chen, Te-Cheng
Raghunath, Putikam
Lin, Ming-Chang
Lin, Hong-Cheu
材料科學與工程學系
應用化學系
Department of Materials Science and Engineering
Department of Applied Chemistry
公開日期: 1-一月-2015
摘要: In this study, two series of novel asymmetrical single- and double-chiral liquid crystal diads using a central linker to link two different mesogenic cores were successfully synthesized. The effects of the position of chiral centers and the number of aromatic rings on the mesomorphic and electro-optical properties were investigated. We found that diads III-N (where N = A, B, C and D) have better mesophasic properties than II-N (where N = A, B, C, D and E). Compared with III-C with a chiral center at the terminal alkoxyl chain, diad III-D exhibited the widest temperature range of BPI (ca. 31 degrees C) as the chiral center was introduced to the central linker. Besides III-D, BPs were also observed in diads II-B and III-B with a chiral center at the central spacer. According to our experimental results and molecular modeling, the mesomorphic properties and temperature ranges of BPs will be affected by the values of biaxiality and dipole moment, along with the bent shape of molecular geometry. Therefore, we demonstrated the first example of asymmetrical single- and double-chiral liquid crystal diads involved chiral centers located at the central linker to exhibit BPs, including the mesophases of BPI and BPIII, which might offer new BP single-components to the future applications of eutectic liquid crystal mixtures with wide BP ranges.
URI: http://dx.doi.org/10.1039/c4ra13943g
http://hdl.handle.net/11536/124057
ISSN: 2046-2069
DOI: 10.1039/c4ra13943g
期刊: RSC ADVANCES
起始頁: 4615
結束頁: 4622
顯示於類別:期刊論文