Effect of ion beam irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals on polyimide surfaces

Kang Min Lee; Byeong Yun Oh; Young Hwan Kim; Dae Shik Seo

doi:10.1063/1.3033380

Effect of ion beam irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals on polyimide surfaces

Kang Min Lee, Byeong Yun Oh, Young Hwan Kim, Dae Shik Seo

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

We investigated the effects of ion beam (IB) irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals (LCs) on polyimide (PI) surfaces. We found that the LC direction follows the IB irradiation alignment direction on the PI surface regardless of whether the irradiation occurs before or after rubbing. We assumed that the LC direction depends strongly on the C-O bonds created from C=O bonds on the PI surface broken by IB irradiation and conducted an investigation of the chemical bonding state of the PI surface by x-ray photoelectron spectroscopy.

Original language	English
Article number	014507
Journal	Journal of Applied Physics
Volume	105
Issue number	1
DOIs	https://doi.org/10.1063/1.3033380
Publication status	Published - 2009

Bibliographical note

Funding Information:
This research was supported by the MKE (Ministry of Knowledge Economy), Korea under the ITRC (Information Technology Research Center) Support program supervised by the IITA (Institute of Information Technology Advancement) (Grant No. IITA-2008-C1090-0801-0018). FIG. 1. Four types of alignment method on the PI surface used in this experiment: (a) IB irradiation after rubbing, (b) rubbing after IB irradiation, (c) rubbing alone, and (d) IB irradiation alone. FIG. 2. Microphotograph of LCs on the PI surfaces subjected to the two types alignment methods (under crossed nichols): (a) IB irradiation after rubbing and (b) rubbing after IB irradiation. FIG. 3. Transmittance as a function of incident angle on the PI surface for the two alignment methods to measure the pretilt angle: (a) IB irradiation after rubbing and (b) rubbing after IB irradiation. FIG. 4. V - T characteristics of the TN cells on the PI surface for (a) IB irradiation after rubbing and (b) rubbing after IB irradiation. FIG. 5. XPS spectra for the C1s of the PI (SE-7492) surface for (a) rubbing, (b) IB irradiation after rubbing, (c) IB irradiation, and (d) rubbing after IB irradiation.

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Physics and Astronomy(all)

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title = "Effect of ion beam irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals on polyimide surfaces",

abstract = "We investigated the effects of ion beam (IB) irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals (LCs) on polyimide (PI) surfaces. We found that the LC direction follows the IB irradiation alignment direction on the PI surface regardless of whether the irradiation occurs before or after rubbing. We assumed that the LC direction depends strongly on the C-O bonds created from C=O bonds on the PI surface broken by IB irradiation and conducted an investigation of the chemical bonding state of the PI surface by x-ray photoelectron spectroscopy.",

author = "Lee, {Kang Min} and Oh, {Byeong Yun} and Kim, {Young Hwan} and Seo, {Dae Shik}",

note = "Funding Information: This research was supported by the MKE (Ministry of Knowledge Economy), Korea under the ITRC (Information Technology Research Center) Support program supervised by the IITA (Institute of Information Technology Advancement) (Grant No. IITA-2008-C1090-0801-0018). FIG. 1. Four types of alignment method on the PI surface used in this experiment: (a) IB irradiation after rubbing, (b) rubbing after IB irradiation, (c) rubbing alone, and (d) IB irradiation alone. FIG. 2. Microphotograph of LCs on the PI surfaces subjected to the two types alignment methods (under crossed nichols): (a) IB irradiation after rubbing and (b) rubbing after IB irradiation. FIG. 3. Transmittance as a function of incident angle on the PI surface for the two alignment methods to measure the pretilt angle: (a) IB irradiation after rubbing and (b) rubbing after IB irradiation. FIG. 4. V - T characteristics of the TN cells on the PI surface for (a) IB irradiation after rubbing and (b) rubbing after IB irradiation. FIG. 5. XPS spectra for the C1s of the PI (SE-7492) surface for (a) rubbing, (b) IB irradiation after rubbing, (c) IB irradiation, and (d) rubbing after IB irradiation. ",

year = "2009",

doi = "10.1063/1.3033380",

language = "English",

volume = "105",

journal = "Journal of Applied Physics",

issn = "0021-8979",

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T1 - Effect of ion beam irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals on polyimide surfaces

AU - Lee, Kang Min

AU - Oh, Byeong Yun

AU - Kim, Young Hwan

AU - Seo, Dae Shik

N1 - Funding Information: This research was supported by the MKE (Ministry of Knowledge Economy), Korea under the ITRC (Information Technology Research Center) Support program supervised by the IITA (Institute of Information Technology Advancement) (Grant No. IITA-2008-C1090-0801-0018). FIG. 1. Four types of alignment method on the PI surface used in this experiment: (a) IB irradiation after rubbing, (b) rubbing after IB irradiation, (c) rubbing alone, and (d) IB irradiation alone. FIG. 2. Microphotograph of LCs on the PI surfaces subjected to the two types alignment methods (under crossed nichols): (a) IB irradiation after rubbing and (b) rubbing after IB irradiation. FIG. 3. Transmittance as a function of incident angle on the PI surface for the two alignment methods to measure the pretilt angle: (a) IB irradiation after rubbing and (b) rubbing after IB irradiation. FIG. 4. V - T characteristics of the TN cells on the PI surface for (a) IB irradiation after rubbing and (b) rubbing after IB irradiation. FIG. 5. XPS spectra for the C1s of the PI (SE-7492) surface for (a) rubbing, (b) IB irradiation after rubbing, (c) IB irradiation, and (d) rubbing after IB irradiation.

PY - 2009

Y1 - 2009

N2 - We investigated the effects of ion beam (IB) irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals (LCs) on polyimide (PI) surfaces. We found that the LC direction follows the IB irradiation alignment direction on the PI surface regardless of whether the irradiation occurs before or after rubbing. We assumed that the LC direction depends strongly on the C-O bonds created from C=O bonds on the PI surface broken by IB irradiation and conducted an investigation of the chemical bonding state of the PI surface by x-ray photoelectron spectroscopy.

AB - We investigated the effects of ion beam (IB) irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals (LCs) on polyimide (PI) surfaces. We found that the LC direction follows the IB irradiation alignment direction on the PI surface regardless of whether the irradiation occurs before or after rubbing. We assumed that the LC direction depends strongly on the C-O bonds created from C=O bonds on the PI surface broken by IB irradiation and conducted an investigation of the chemical bonding state of the PI surface by x-ray photoelectron spectroscopy.

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DO - 10.1063/1.3033380

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VL - 105

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JF - Journal of Applied Physics

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ER -

Effect of ion beam irradiation and rubbing on the directional behavior and alignment mechanism of liquid crystals on polyimide surfaces

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