Nanomaterials logo

Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

IvSU logo
Rus Eng


Our Facebook account

SCImago Journal & Country Rank


Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2020, 20 (3), 26—33.
DOI: 10.18083/LCAppl.2020.3.26

Ferroelectric Smectic C* Phase with Sub-Wavelength Helix Pitch Induced in a Nematic Liquid Crystal by Chiral Non-Mesogenic Dopants

E. P. Pozhidaev1,2, S. I. Torgova1, E. M. Budynina1,3, T. P. Tkachenko1,2, A. V. Kuznetsov1,2, V. A. Barbashov1

Author affiliations
1P. N. Lebedev Physical Institute,
53 Leninsky Pr., Moscow, 119991, Russia
2Moscow Aviation Institute (National Research University),
4 Volokolamskoe Sh., Moscow, 125993, Russia
3Lomonosov Moscow State University, Department of Chemistry,
1-3 Leninskie gory, Moscow, 119991, Russia

We report the development of chiral smectic C* (SmC*) ferroelectric materials with a short helix pitch p0 < 150 nm obtained by mixing a nematic liquid crystal (NLC) and chiral non-mesogenic dopants. Chiral dopants are optically active lactates based on terphenyldicarboxylic acid, and the NLC is a binary eutectic mixture of phenyl- and biphenylpyrimidines. The appearance of the SmC* phase in mixtures was confirmed by dielectric, optical and electro-optical measurements. The proposed method for the elaboration of smectic C* material makes it possible to create innovative electro-optical media that combine the mechanical stability of NLC and a high switching frequency of ferroelectric liquid crystals. The high twisting power of chiral lactates in the developed nematic matrix made it possible to obtain a satisfactory optical quality of induced SmC* in electro-optical cells that can efficiently operate up to frequency of 3 kHz.

Keywords: ferroelectric liquid crystal, chiral dopants, nematic matrix, helix pitch

An Erratum to this article is available

Feedback webmaster