Mesomorphic, electro-optic and structural properties of binary liquid crystalline mixtures with ferroelectric and antiferroelectric liquid crystalline behaviour

0494604 - FZÚ 2019 RIV GB eng J - Journal Article
Fitas, J. - Marzec, M. - Szymkowiak, M. - Jaworska-Golab, T. - Deptuch, A. - Tykarska, M. - Kurp, K. - Żurowska, M. - Bubnov, Alexej
Mesomorphic, electro-optic and structural properties of binary liquid crystalline mixtures with ferroelectric and antiferroelectric liquid crystalline behaviour.
Phase Transitions. Roč. 91, č. 9-10 (2018), s. 1017-1026. ISSN 0141-1594. E-ISSN 1029-0338
R&D Projects: GA ČR GA16-12150S
Grant - others:AV ČR(CZ) PAN-17-04
Program: Bilaterální spolupráce
Institutional support: RVO:68378271
Keywords : liquid crystal * fluorinated materials * ferroelectric phase * antiferroelectric phase * mesomorphic behaviour * binary mixture * spontaneous polarisation
OECD category: Materials engineering
Impact factor: 1.026, year: 2018

Two new binary liquid crystalline mixtures composed from the chiral liquid crystalline materials with fluorinated non-chiral chain and without lateral substitution at the molecular core have been designed and investigated by polarisation optical microscopy, differential scanning calorimetry, broad-band dielectric spectroscopy, and X-ray techniques. Both mixtures possess the paraelectric orthogonal smectic A*, the tilted ferroelectric smectic C* and the antiferroelectric smectic CA* phases over a reasonably broad temperature range. The gained results reveal a considerable improvement of (i) the broadness of the mesophases temperature range of the ferroelectric and antiferroelectric phases (up to 130 K broad) and (ii) electro-optical properties, namely the spontaneous polarisation (up to 200 nC/cm2) and tilt angle (higher than 40o), with respect to that of the original pure compounds.
Permanent Link: http://hdl.handle.net/11104/0287719