Pinning effect on the phase separation dynamics of thin polymer-dispersed liquid crystals

Yi-Hsin Lin*, Hongwen Ren, Yung Hsun Wu, Xiao Liang, Shin Tson Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The surface pining effects on phase separation dynamics of polymer-dispersed liquid crystals (PDLCs) with thin cell gaps are demonstrated. Comparing various boundary conditions, the inner surfaces of the substrates with or without polyimide layers [but no rubbing] cannot provide enough anchoring force, so in either case the liquid crystal (LC) droplets flow and coalesce to form larger and less uniform droplets. However, if the inner surfaces of the substrates are coated with rubbed polyimide layers with anchoring energy >1×10-4 J/m2, almost all the nucleated LC droplets grow at a fixed position during phase separation. The appearance of the coalescence is not obvious and the formed LC droplets are relatively uniform. The surface anchoring has a significant effect on the morphology of PDLCs.

Original languageEnglish
Pages (from-to)468-474
Number of pages7
JournalOptics Express
Volume13
Issue number2
DOIs
StatePublished - 1 Jan 2005

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