Tunable alignment of liquid crystals between anisotropic polyacrylamide thin layer
- Authors
- 이동욱; 김동현; Oh, Jin Young; Dae-Shik SEO
- Issue Date
- Mar-2022
- Publisher
- A V S AMER INST PHYSICS
- Keywords
- polyacrylamide; ion beam; Physicochemical modifications; atomic force microscopy
- Citation
- JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, v.40, no.2, pp 023408-1 - 023408-10
- Journal Title
- JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
- Volume
- 40
- Number
- 2
- Start Page
- 023408-1
- End Page
- 023408-10
- URI
- https://yscholarhub.yonsei.ac.kr/handle/2021.sw.yonsei/6750
- DOI
- 10.1116/6.0001695
- ISSN
- 0734-2101
1520-8559
- Abstract
- We report uniform liquid crystal (LC) alignment on a polyacrylamide (PAM) film via ion beam (IB) treatment. The IB incidence angle is adjusted from 15° to 75°. Physicochemical modifications caused by the IB process are investigated by atomic force microscopy and x-ray photoelectron spectroscopy. Low IB incidence results in biased and bumpy surfaces, whereas high IB incidence forms isotropic and smooth surfaces; both of these are unsuitable for uniform LC alignment. The 45° IB incidence induces anisotropic surface chemical reformations, and these modifications induce van der Waals forces between the LCs and modified PAM, thereby leading to uniform LC alignment. The LC alignment state is verified by polarized optical microscopy and pretilt angle. The electro-optical characteristic of the modified PAM showed excellent switching performance in twisted-nematic LC system. Thus, the IB-treated PAM film is a good candidate for LC alignment layers and suitable for LC device applications.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Electrical and Electronic Engineering > 1. Journal Articles
Items in Scholar Hub are protected by copyright, with all rights reserved, unless otherwise indicated.