Author/Editor     Gorecka, E; Pociecha, D; Čepič, Mojca; Žekš, Boštjan; Dabrowski, R
Title     Enantiomeric excess dependence of the phase diagram of antiferroelectric liquid crystals
Type     članek
Source     Phys Rev, E Stat Phys Plasmas Fluids Relat
Vol. and No.     Letnik 65
Publication year     2002
Volume     str. 061703-1-4
Language     eng
Abstract     The phase diagram of the prototype antiferroelectric liquid crystal 4-(1-methylheptyloxycarbonyl)phenyl-4'-octyloxybiphengl-4-carbox ylate (MHPOBC) in dependence of enantiomeric excess was measured. It was shown that the Sm-C` phase in very pure samples is the Sm-C*F/2 phase with a four-layer structure, and only after small racemization it transforms into the ferroelectric Sm-C* phase. The phase diagram was theoretically explained by taking into account longer range bilinear and short range biquadratic interlayer interactions, that lead to the distorted clock structures and first-order transitions between them.
Descriptors     BIOPHYSICS
CRYSTALLIZATION
ELECTROMAGNETIC FIELDS
STEREOISOMERISM