Electroconvection in nematic liquid crystals with positive dielectric and negative conductivity anisotropy.

摘要: Electroconvection in an unusual nematic compound with strongly positive dielectric anisotropy and negative of the conductivity is investigated. For homeotropic alignment, where one has a direct transition to rolls or squares depending on frequency applied voltage, we present quantitative theory. From comparison infer values for some viscosities, which are rather unusual, but not unreasonable view vicinity nematic-smectic transition. planar electroconvection sets above splay Freedericksz ``parallel rolls,'' also captured by