Electro-optic and dielectric properties of new binary ferroelectric and antiferroelectric liquid crystalline mixtures

0477670 - FZÚ 2018 RIV GB eng J - Journal Article
Fitas, J. - Marzec, M. - Kurp, K. - Żurowska, M. - Tykarska, M. - Bubnov, Alexej
Electro-optic and dielectric properties of new binary ferroelectric and antiferroelectric liquid crystalline mixtures.
Liquid Crystals. Roč. 44, č. 9 (2017), s. 1468-1476. ISSN 0267-8292. E-ISSN 1366-5855
R&D Projects: GA MŠMT(CZ) LD14007; GA ČR GA15-02843S
Grant - others:EU - ICT(XE) COST Action IC1208
Institutional support: RVO:68378271
Keywords : liquid crystals * ferroelectric and antiferroelectric phase * binary mixture * dielectric spectroscopy * switching time * tilt angle
OECD category: Nano-materials (production and properties)
Impact factor: 2.636, year: 2017

Several new binary liquid crystalline mixtures have been designed and their properties were studied by complementary methods. It has been shown that even both pure components used for the mixture design possess the ferroelectric behaviour, the induced antiferroelectric smectic phase has been detected for one of the prepared mixtures. The phase diagram has been constructed and the existence of the antiferroelectric phase was confirmed by switching time and dielectric spectroscopy measurements. Some of the resulted mixtures possess very high values of the tilt angle that reaches close below 45 degrees degrees at saturation. Values of spontaneous polarisation were found within 50-200nC/cm(2) in dependence of the mixture's composition. Due to specific properties, the obtained mixtures might be interesting for further design of multicomponent mixtures and formulation of the advanced nanocomposite systems.
Permanent Link: http://hdl.handle.net/11104/0273951