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Molecular Crystals and Liquid Crystals Volume 583, 2013 - Issue 1: Proceedings of the Advanced Display Materials and Devices 2012 (ADMD 2012)
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LIQUID CRYSTAL DISPLAY

Pretilt Preference of Liquid Crystals on Ion-Beam-Treated Polyimide Layer Surfaces

Phil Kook Son Department of Chemical Engineering, and Regional Innovation Center-Components and Materials for Information Display, Kyung Hee University, Yongin, Gyeonggi-do, 446–701, Republic of Korea
,
Taehyung Kim Department of Chemical Engineering, and Regional Innovation Center-Components and Materials for Information Display, Kyung Hee University, Yongin, Gyeonggi-do, 446–701, Republic of Korea
,
Suk-Won Choi Department of Chemical Engineering, and Regional Innovation Center-Components and Materials for Information Display, Kyung Hee University, Yongin, Gyeonggi-do, 446–701, Republic of Korea
,
Sung Soo Kim Department of Chemical Engineering, and Regional Innovation Center-Components and Materials for Information Display, Kyung Hee University, Yongin, Gyeonggi-do, 446–701, Republic of Korea
&
Jin Seog Gwag Department of Physics, Yeungnam University, Gyeongsan, 712–749, Republic of Korea
Pages 104-108 | Published online: 16 Dec 2013
 
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Abstract

The pre-tilt direction of a liquid crystal (LC) on a polyimide (PI) surfaces obtained by using a contact angle method is systematically examined. We found from scanning probe microscopy (damping force microscopy and friction force microscopy) data that ion-beam-treated PI surfaces have an asymmetrical morphology which determines the preferred direction of the LC. Azimuthally various contact angles on an ion-beam-treated PI surface are connected deeply with modified surface morphologies. As a result, the effect of LC pre-tilt direction on ion-beam-treated PI is to lower the contact angle direction.

Acknowledgment

This work was supported by a grant from Kyung Hee University in 2012 (KHU-20120184).

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