1.
Phys Rev E Stat Nonlin Soft Matter Phys
; 66(5 Pt 1): 051713, 2002 Nov.
Artículo
en Inglés
| MEDLINE
| ID: mdl-12513509
RESUMEN
Electroconvection in an unusual nematic compound with strongly positive dielectric anisotropy and negative anisotropy of the conductivity is investigated. For homeotropic alignment, where one has a direct transition to rolls or squares depending on the frequency of the applied voltage, we present a quantitative theory. From the comparison we infer values for some viscosities, which are rather unusual, but not unreasonable in view of the vicinity of the nematic-smectic transition. For planar alignment, electroconvection sets in above a splay Freedericksz transition with "parallel rolls," which is also captured by the theory.