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.
- structure studies
- nematic phase
- bent-core molecules
Vaupotic, N., Szydlowska, J., Salamonczyk, M., Kovarova, A., Svoboda, J., Osipov, M. A., Pociecha, D., & Gorecka, E. (2009). Structure studies of the nematic phase formed by bent-core molecules. Physical Review E, 80(3). https://doi.org/10.1103/PhysRevE.80.030701