Ion-beam irradiation modified chemical and physical surface characteristics of polyethylene glycol film for liquid crystal aligning

Hae Chang Jeong, Jonghoon Won, Ju Hwan Lee, Dong Hyun Kim, Dong Wook Lee, Byeong Yun Oh, Jeong Min Han, Dae-Shik Seo

Research output: Contribution to journalArticle

Abstract

The characteristics of ion beam (IB) irradiated polyethylene glycol (PEG) films were analyzed to determine their potential use as a liquid crystal (LC) alignment layer. The transmittance of the PEG films at various IB intensities was measured to verify the possibility of using it as an alignment layer. Anti-parallel cells with the PEG film were fabricated to examine the LC alignment characteristics. Perfectly dark cross-polarized microscopy images were obtained at an intensity of 700 eV, which indicates uniform LC alignment, and pre-tilt angle measurements supported this finding. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) analyses were conducted to determine the effect of the IB irradiation on the PEG film on the surface modification. After exposure at an IB intensity of 700 eV where uniform LC alignment was achieved, remarkable chemical composition modification of the PEG film, including the reduction of C-O bonds that affected the uniform LC alignment, was observed via the XPS analysis. Furthermore, the AFM analysis revealed that low kurtosis value was obtained at this IB intensity. Therefore, we are convinced that the PEG films irradiated at this low IB intensity show potential as alternative alignment layer in LC applications.

Original languageEnglish
Pages (from-to)368-374
Number of pages7
JournalSoft Materials
Volume17
Issue number4
DOIs
Publication statusPublished - 2019 Oct 2

Fingerprint

Liquid Crystals
Liquid crystals
Ion beams
Polyethylene glycols
glycols
polyethylenes
ion beams
liquid crystals
alignment
Irradiation
irradiation
Atomic force microscopy
X ray photoelectron spectroscopy
photoelectron spectroscopy
atomic force microscopy
kurtosis
Angle measurement
Surface treatment
transmittance
Microscopic examination

All Science Journal Classification (ASJC) codes

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

Cite this

Jeong, Hae Chang ; Won, Jonghoon ; Lee, Ju Hwan ; Kim, Dong Hyun ; Lee, Dong Wook ; Oh, Byeong Yun ; Han, Jeong Min ; Seo, Dae-Shik. / Ion-beam irradiation modified chemical and physical surface characteristics of polyethylene glycol film for liquid crystal aligning. In: Soft Materials. 2019 ; Vol. 17, No. 4. pp. 368-374.
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Ion-beam irradiation modified chemical and physical surface characteristics of polyethylene glycol film for liquid crystal aligning. / Jeong, Hae Chang; Won, Jonghoon; Lee, Ju Hwan; Kim, Dong Hyun; Lee, Dong Wook; Oh, Byeong Yun; Han, Jeong Min; Seo, Dae-Shik.

In: Soft Materials, Vol. 17, No. 4, 02.10.2019, p. 368-374.

Research output: Contribution to journalArticle

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AU - Lee, Dong Wook

AU - Oh, Byeong Yun

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