X-ray investigations and magnetic field effect on a nematic phase of disc-like molecules

Autor:	Anne-Marie Levelut, Nguyen Huu Tinh, C. Destrade, F. Hardouin, H. Gasparoux
Rok vydání:	1981
Předmět:	Diffraction Materials science Condensed matter physics Biaxial nematic Mesophase Triphenylene Condensed Matter::Soft Condensed Matter Crystallography chemistry.chemical_compound chemistry Liquid crystal Phase (matter) Diamagnetism Columnar phase
Zdroj:	Journal de Physique. 42:147-152
ISSN:	0302-0738
DOI:	10.1051/jphys:01981004201014700
Popis:	The X-ray diffraction patterns of powder samples of the fluid mesophase of the hexaalkoxybenzoates of triphenylene which is a disc-like molecule are similar to the diffraction patterns of non orientated nematic phase of rod-like molecules. Furthermore, we give evidence for a uniaxial character of this anisotropic medium with a negative diamagnetic anisotropy, the flat molecules are orientated parallel each other by a rotating magnetic field. In addition, the X-ray patterns of orientated samples of the hexyloxy compound revealed pretransitional effects in this nematic phase of disc-like molecules (ND). This short-range translational order, sort of skewed cybotactic groups originates from the existence of a low temperature columnar phase with an original tilted packing here described.
Databáze:	OpenAIRE
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