Volume 109, Number 5, March 2015
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||18 March 2015|
Chiral doping effect in the B2 phase of a bent-core liquid crystal: The observation of resonant X-ray satellite peaks assigned to the 5/10 layer periodic structure
1 Department of Physics, Kyoto University - Kitashirakawaoiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
2 Center for Advanced Materials Analysis, Tokyo Institute of Technology - O-okayama, Meguro-ku, Tokyo 152-8550, Japan
3 Photon Factory, Institute of Material Structure Science - 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
4 Department of Organic and Polymeric Materials, Tokyo Institute of Technology - O-okayama, Meguro-ku, Tokyo 152-8550, Japan
Received: 24 November 2014
Accepted: 25 February 2015
We studied the details of a local layer structure in the B2 phase of bromo-containing bent-core liquid crystals mixed with a small amount of chiral molecules using microbeam resonant X-ray scattering. In this measurement, we detected the 1 ± 0.2 order satellite peaks, which suggest that the B2 phase of the mixture has a long-range periodic structure. Dielectric and electro-optic measurements indicate almost the same behavior as the antiferroelectric SmCAPA(B2) of pure bromo-containing bent-core liquid crystals, so that the B2 phase of the chiral mixture is also antiferroelectric, and it is concluded that the B2 phase of the chiral mixture forms a ten-layer periodic structure. Such a long-range periodic structure did not appear by mixing the racemate of the same compounds, which indicates the chiral effect on the long-range periodic structure.
PACS: 61.30.-v – Liquid crystals / 61.30.Eb – Experimental determinations of smectic, nematic, cholesteric, and other structures / 61.05.cf – X-ray scattering (including small-angle scattering)
© EPLA, 2015
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