journal article·2022-09-27

Controlling the Pretilt Angles of Guest–Host Liquid Crystals via a Hydrophilic Polyimide Layer through Oxygen Plasma Treatment

Yuge Liang, Yumeng Wang, Mengmeng Zhu, Longzhen Qiu, Jun Zhu, Bo Zhang, Ying Liu, Hongbo Lu, Miao Xu

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Abstract

The control of the liquid crystal (LC) alignment is an important factor for practical applications. The conventional method typically used is the rubbing of the polyimide (PI) layer. However, it is difficult to obtain intermediate pretilt angles by employing such a method. In this paper, control of the pretilt angle of the LC is achieved by modifying the surface wettability of the PI films via oxygen plasma treatment. A new mode for guest–host liquid crystal (GHLC) smart windows is achieved with intermediate initial transmittance by controlling the pretilt angle, which can turn from the initial state to either the transparent or dark states. Different modes for the GHLC-based smart windows can be fabricated that are dependent on the environmental conditions.
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Research context

OpenAlex topics: Liquid Crystal Research Advancements · Synthesis and properties of polymers · Advanced Materials and Mechanics

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Affiliations

National Engineering Laboratory of Special Display Technology, State Key Laboratory of Advanced Display Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei 230009, China

Anhui Province Key Laboratory of Advanced Functional Materials and Devices, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China

Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, School of Instrument Science and Opto-Electronic Engineering, Hefei 230009, China

Department of Materials Research, AVIC Beijing Aeronautic Manufacturing Technology Research Institute, Beijing 100024, China

Funding

Ministry of Science and Technology of the People's Republic of China · China Postdoctoral Science Foundation · National Natural Science Foundation of China · Natural Science Foundation of Anhui Province

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