Large Twist Elastic Constant in Diphenylacetylene-Core-Based Liquid Crystals

Autor:	Fumito Araoka, Khoa V. Le, Satoshi Aya, Hideo Takezoe, Shohei Ogino, Kunihiko Okano
Rok vydání:	2015
Předmět:	Range (particle radiation) Azo compound Chemistry General Chemistry Condensed Matter Physics Core (optical fiber) Crystallography chemistry.chemical_compound Liquid crystal Phase (matter) General Materials Science Twist Diphenylacetylene Order of magnitude
Zdroj:	Molecular Crystals and Liquid Crystals. 614:124-127
ISSN:	1563-5287 1542-1406
DOI:	10.1080/15421406.2015.1050289
Popis:	We determine elastic constants K11, K22, and K33 in two diphenylacetylene-core-based liquid crystals with azo and ester linkages. As we have already reported (Adv. Mater. (2014) 26, 1918), K33 is extremely large (sub-nN) compared with K11 (pN) in the azo compound, since cybotactic smectic (Sm) clusters exist in whole the nematic (N) phase range. As a natural consequence, K22 is expected to be also large. We confirm that K22 is several tens pN, which is smaller than K33 but larger than K11 by one order of magnitude, K33>>K22>>K11. This is the first compound, which has a larger K22 than K11. In the ester compound, which has no clusters in the N phase, all the elastic constants are in a pN range, and are in the usual order, K33>K11>K22. It is also important to note that not only K33 and K22 but also K11 show a pretransitional increase when the N-SmC phase transition temperature is approached.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d94592dad960f3951f206fa096401c0c https://doi.org/10.1080/15421406.2015.1050289 Zobrazit plný text záznamu