Cv. Brown et al., Determination of the temperature dependent smectic C biaxial permittivity tensor ant elastic constants, MOL CRYST A, 331, 1999, pp. 2325-2332
Citations number
12
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS
The direct measurement of the smectic C bend (B-1) and splay (B-2) elastic
constants and the three permittivities epsilon(1), epsilon(2) and epsilon(3
) for the commercial material SCE8R is described. A new technique has been
employed in which some of the assumptions inherent in previous measurements
([1,2]) have been removed and the inaccuracies have been reduced. This invo
lves fitting the a.c. field dependence of the permittivity in the surface s
tabilised chevron (C2U) geometry using continuum modelling. Data from the f
itting process is combined with measurements of the homeotropic permittivit
y and electro-optical measurements of the layer tilt angle and smectic cone
angle.