Chirality and polarity transfers between bent-core smectic liquid-crystal substances

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A. Jákli and G. Liao
Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA

I. Shashikala, U. S. Hiremath, and C. V. Yelamaggad
Centre for Liquid Crystal Research, Jalahalli, Bangalore-560 013, India

Received 14 April 2006; published 20 October 2006

Liquid-crystalphases with both solid and liquid characteristics are unique, sincethey exhibit chirality on both molecular and mesoscopic levels underspecial circumstances. We have studied binary composites formed by mixingof a chiral dimer (B-Ch), in which a bent coreis covalently linked to a promesogenic cholesterol unit through aflexible spacer, and an achiral bent-core mesogen having two vicinalfluorine atoms (B-2F). The pure materials show smectic phases featuringC₂ symmetry. The dimer B-Ch displays conventional chiral smectic C(SmC^*) phase with a chirality—induced polarization P_c~30 nC/cm², whereas B-2F possessessynclinic and anticlinic antiferroelectric "banana" smectic (SmCP) phase with arelatively high-polarization (P_b) value of about 900 nC/cm². Mixing these twomaterials we were able to measure P_c, and we haveverified that the molecular chirality contributes to the polarization ofbanana phases only in synclinic configurations.

URL:	http://link.aps.org/doi/10.1103/PhysRevE.74.041706
DOI:	10.1103/PhysRevE.74.041706
PACS:	61.30.Eb; 61.30.Cz; 61.30.Gd; 64.70.Md 61.30.Eb Experimental determinations of smectic, nematic, cholesteric, and other structures 61.30.Cz Molecular and microscopic models and theories of liquid crystal structure 61.30.Gd Orientational order of liquid crystals in electric and magnetic fields 64.70.Md Transitions in liquid crystals YEAR: 2006
KEYWORDS:	smectic liquid crystals, antiferroelectric liquid crystals, chirality, mixing

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