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Structure studies of the nematic phase formed by bent-core molecules

Vaupotic, N. and Szydlowska, J. and Salamonczyk, M. and Kovarova, A. and Svoboda, J. and Osipov, M.A. and Pociecha, D. and Gorecka, E. (2009) Structure studies of the nematic phase formed by bent-core molecules. Physical Review E, 80 (3). ISSN 1539-3755

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In recent years there are several reports showing that bent-core mesogenic molecules are able to form biaxial nematic phase in which molecular rotation around the long molecular axis is strongly hindered. The x-ray pattern with azimuthally split signals at low angle region of diffraction is usually given as evidence for the biaxial nematic phase. We show experimentally and theoretically that such x-ray pattern is due to the local smectic-C fluctuations ('cybotactic' groups) in the uniaxial nematic phase.