Mesomorphic, electro-optic and structural properties of binary liquid crystalline mixtures with ferroelectric and antiferroelectric liquid crystalline behaviour. (3rd October 2018)

• Record Type: Journal Article
• Authors: Fitas, Jakub; Marzec, Monika; Szymkowiak, Marta; Jaworska-Gołąb, Teresa; Deptuch, Aleksandra; Tykarska, Marzena; Kurp, Katarzyna; Żurowska, Magdalena; Bubnov, Alexej
• Is Part Of: Phase transitions. Volume 91:Number 9/10(2018)
• Page Start: 1017
• Page End: 1026
• Publication Date: 2018-10-03
• Subjects: Liquid crystal -- fluorinated materials -- ferroelectric phase -- antiferroelectric phase -- binary mixture -- electro-optic properties; Phase transformations (Statistical physics) -- Periodicals; 530.47405
• DOI: 10.1080/01411594.2018.1506883
• Languages: English
• ISSNs: 0141-1594

Abstract

ABSTRACT: Two new binary liquid crystalline mixtures composed from the chiral liquid crystalline materials with partially 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 breadth) and (ii) electro-optical properties, namely the spontaneous polarisation (up to 200 nC/cm 2 ) and tilt angle (higher than 40 o ), with respect to that of the original pure compounds.