Effect of the chiral chain length on structural and phase properties of ferroelectric liquid crystals

0361274 - FZÚ 2012 RIV GB eng J - Journal Article
Stojanović, M. - Bubnov, Alexej - Obadović, D.Ž. - Hamplová, Věra - Kašpar, Miroslav - Cvetinov, M.
Effect of the chiral chain length on structural and phase properties of ferroelectric liquid crystals.
Phase Transitions. Roč. 84, č. 4 (2011), s. 380-390. ISSN 0141-1594. E-ISSN 1029-0338
R&D Projects: GA AV ČR IAA100100911; GA AV ČR(CZ) GA202/09/0047; GA ČR(CZ) GAP204/11/0723
Grant - others:RFASI(RU) No 02.740.11.5166
Institutional research plan: CEZ:AV0Z10100520
Keywords : ferroelectric liquid crystal * alkoxypropionate chiral group * spontaneous polarization * tilt angle * X-ray diffraction * dielectric spectroscopy
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.006, year: 2011
http://dx.doi.org/10.1080/01411594.2010.545185

Electro-optic and structural studies obtained on several ferroelectric liquid crystalline materials with 2-alkoxypropionate group used as a chiral centre and without any lateral substitution are presented. In dependence on the chiral chain length these compounds exhibit the cholesteric N* phase, the ferroelectric smectic C*, and a low temperature SmX phase. Values of the spontaneous polarization and spontaneous tilt angle have been determined within the whole range of the SmC* phase. A low temperature SmX phase has been identified as the orthogonal hexatic SmB phase. The molecular parameters, namely the layer spacing in the SmC* and SmB phases and the average intermolecular distances (D) between neighbouring parallel molecules in all investigated phases have been determined using the results of the X-ray diffraction data obtained on non-oriented samples.
Permanent Link: http://hdl.handle.net/11104/0198629