Liquid crystal alignment induced by controllable surface wettability of BiFeO3 bumps thin layer

Yang Liu; Kaihua Liu; Pushan Wen; Byeong Yun Oh; Hong Gyu Park; Dae Shik Seo

doi:10.1080/02678292.2015.1108465

Liquid crystal alignment induced by controllable surface wettability of BiFeO₃ bumps thin layer

Yang Liu, Kaihua Liu, Pushan Wen, Byeong Yun Oh, Hong Gyu Park, Dae Shik Seo

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article

5 Citations (Scopus)

Abstract

The alignment of liquid crystals (LCs) in LC-based optical devices determines the visual quality of devices, and a simple pretreatment is necessary for LC alignment. Here, we present a BiFeO₃ (BFO) thin layer working as an alignment layer, homogeneously aligning LCs after a pre-thermal annealing treatment. Dramatic BFO bumps were observed during the thermal annealing process, and a corresponding enhancement in wettability was detected from measurement of tunable contact angles. LCs in the BFO bump thin layer sandwiched TN cell were found to be perfectly homogeneously aligned due to the enhanced anisotropy and wettability caused by the morphology change of the thin layer.

Original language	English
Pages (from-to)	320-326
Number of pages	7
Journal	Liquid Crystals
Volume	43
Issue number	3
DOIs	https://doi.org/10.1080/02678292.2015.1108465
Publication status	Published - 2016 Feb 19

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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Liu, Y., Liu, K., Wen, P., Oh, B. Y., Park, H. G., & Seo, D. S. (2016). Liquid crystal alignment induced by controllable surface wettability of BiFeO₃ bumps thin layer. Liquid Crystals, 43(3), 320-326. https://doi.org/10.1080/02678292.2015.1108465

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AB - The alignment of liquid crystals (LCs) in LC-based optical devices determines the visual quality of devices, and a simple pretreatment is necessary for LC alignment. Here, we present a BiFeO3 (BFO) thin layer working as an alignment layer, homogeneously aligning LCs after a pre-thermal annealing treatment. Dramatic BFO bumps were observed during the thermal annealing process, and a corresponding enhancement in wettability was detected from measurement of tunable contact angles. LCs in the BFO bump thin layer sandwiched TN cell were found to be perfectly homogeneously aligned due to the enhanced anisotropy and wettability caused by the morphology change of the thin layer.

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