Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics · 2001 · 36 citations · 16 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMaterials CharacterizationSolid State PhysicsCrystalline MaterialsDielectricsLiquid Crystal MaterialsLiquid CrystalsPhase TransitionsSolid-state Phase TransitionsAnchoringElastic StrainGoldstone ModesGrain BoundariesGrain Boundary Phase TransitionsLiquid Crystal Dielectric PropertiesSmectic PhasesViscosity
The dielectric properties of the twist grain boundaries TGB(A) and TGB(C) of liquid crystal phases differ from the smectic-A and smectic-C phase ones: a theoretical model confirmed by experimental results shows that the Goldstone mode of the TGB(C) phase and the soft mode of the TGB(A) phase are strongly reduced. This behavior is due to elastic strain, which is connected to two parameters: the anchoring at the grain boundaries and the distance between the grain boundaries. It is shown quantitatively that a relatively flexible anchoring in the TGB(A) phase becomes rigid in the TGB(C) one. The relaxation frequencies of these modes allow analysis of the rotational viscosity variations.
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Characterization of a new helical smectic liquid crystal
John W. Goodby, M. A. Waugh, S. M. Stein et al. · Nature · 1989 · 467 citations