ORIENTATIONAL DIFFUSIVITIES MEASUREMENT BY LIGHT-BEATING SPECTROSCOPYFOR A DISK-LIKE THERMOTROPIC NEMATIC PHASE (N-D)

Authors
OTHMAN T GHARBIA M GHARBI A DESTRADE C DURAND G
Citation
T. Othman et al., ORIENTATIONAL DIFFUSIVITIES MEASUREMENT BY LIGHT-BEATING SPECTROSCOPYFOR A DISK-LIKE THERMOTROPIC NEMATIC PHASE (N-D), Liquid crystals, 18(6), 1995, pp. 839-842
Citations number
11
Categorie Soggetti
Crystallography
Journal title
Liquid crystals → ACNP
ISSN journal
02678292
Volume
18
Issue
6
Year of publication
1995
Pages
839 - 842
Database
ISI
SICI code
0267-8292(1995)18:6<839:ODMBLS>2.0.ZU;2-T
Abstract
Using a light-beating technique and for an appropriate scattering geom etry, we have measured separately the orientational diffusivities D-sp lay and D-twist for an 'hexa-n-alcanoyloxytruxene' (HATX C12H25) sampl e which exhibits a disk-like thermotropic nematic phase (N-D) between 57 degrees C and 84 degrees C. D-splay and D-twist are about 100 times weaker than those corresponding to rod-like thermotropic nematics. Th e deviation can be attributed to higher viscosities eta(splay) and eta (twist).