A method of achieving homeotropic alignment of liquid crystals(LCs) by ultraviolet light induced phase separation of LC from its mixture with photo-curable pre-polymer is reported. Vertical polymer columns and micro-fibrils developed during the phase separation promote homeotropic alignment of the LC director (i.e., alignment perpendicular to the LC-substrate interface), suitable for devices based on LCs possessing negative dielectricanisotropy. These vertical structures extend between two substrates and permit the fabrication of highly flexible electro-optical devices with high contrast coupled with fast response times. This simple single-step technique eliminates the need for the traditional polymer alignment layer pre-deposited on substrates.
Applied Physics Letters
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The following article appeared in Applied Physics Letters and may be found at http://scitation.aip.org/content/aip/journal/apl/99/22/10.1063/1.3663966
Acharya, Bharat R.; Choi, Hyunchul; Srinivasarao, Mohan; Kumar, Satyendra (2011). Homeotropically Aligning Phase Separated Columnar Structures For Fabrication Of Flexible Electrooptical Devices. Applied Physics Letters 88 221108-1-221108-3. doi: 10.1063/1.3663966. Retrieved from https://oaks.kent.edu/phypubs/135