We have observed an interesting pattern evolution of cholesteric liquid crystals during the homeotropic-focal conic transition in a dispersed polymer network. From the electrical field induced homeotropic state, if the field is:reduced to an appropriate bias level focal conics grow at a constant speed, being an open or compact structure depending on the field strength. When the field is increased, these patterns change to ramified structures. We phenomenologically explained the observation.
Physical Review Letters
Copyright 1999 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.82.4855.
Zhu, Yang-Ming; Yang, Deng-Ke (1999). Observation of Pattern Evolution During Homeotropic-Focal Conic Transition in Cholesteric Liquid Crystals. Physical Review Letters 82(24) 4855-4858. doi: 10.1103/PhysRevLett.82.4855. Retrieved from https://oaks.kent.edu/cpippubs/255