Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.364, 381-393, 2001
Droplets nucleation in smectic-C* free-standing films
The behavior of freely suspended smectic-C* (SmC*) films at the bulk Smectic-C*-cholesteric (N*) phase transition has been investigated. According to our experimental observations, the heating of the SmC* free-standing film above the bulk SmC*-N* phase transition can give rise to conventional layer thinning transitions or to nucleation of N* droplets trapped inside the film. The optical texture observations show that a N* droplets confined in the SmC* host phase are accompanied by topological defects, Due to the boundary condition fixed by the anisotropic host phase elastic interactions between droplet-defect pairs appear. These interactions drive the self-organization of the droplet-defect pairs in chain-like structures. In this paper. we present the experimental conditions acting on the droplet nucleation process and on the droplet chaining.