Chiral smectic C subphases induced by mixing a bistereogenic antiferroelectric liquid crystal with a non-chiral liquid crystal
Journal article, 2005

By mixing a bistereogenic antiferroelectric liquid crystal (AFLC) compound, exhibiting only the SmQ* and SmC a * mesophases, with the achiral N-SmC liquid crystal HOAB we could induce all three AFLC SmC-type subphases, SmC α *, SmC β * and SmC γ *. This seems to be in contradiction with two recent postulations regarding the subphase stability, one of which suggests that the subphases appear as a result of strong chiral interactions, the other that these phases require high smectic order, something one would generally not expect in mixtures. We have studied the helical pitch, optical tilt angle, spontaneous polarization and the x-ray diffraction due to the smectic layering, as a function of mixing ratio in order to better understand the relation between phase sequence and mixture composition. The smectic layer spacing shows a strongly non-linear behavior, suggesting that the basic structure of the pure AFLC substance is retained up to a HOAB content of about 75%.

antiferroelectric liquid crystals

smectic layer spacing


smectic order

chiral smectic C subphases

liquid crystal mixtures


J. P. F. Lagerwall

University of Stuttgart

Frank Giesselmann

University of Stuttgart

Sebastien Rauch

Technische Universität Berlin

Gerd Heppke

Technische Universität Berlin

Per Rudquist

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Sven Lagerwall

Chalmers, Microtechnology and Nanoscience (MC2), Photonics


0015-0193 (ISSN)

Vol. 315 221-230

Subject Categories

Physical Sciences



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