Journal
ACS APPLIED ELECTRONIC MATERIALS
Volume 4, Issue 9, Pages 4632-4640Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.2c00868
Keywords
pretilt angle; liquid crystal alignment; guest-host liquid crystals; wettability; liquid crystal displays; smart window
Funding
- National Key Research and Development Program of China [2019YFE0101300]
- National Natural Science Foundation of China (NSFC) [61805066]
- Natural Science Foundation of Anhui Province [1708085MF150]
- China Postdoctoral Science Foundation [2019M 652168]
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By modifying the surface wettability of PI films through oxygen plasma treatment, this paper achieved control of the pretilt angle of liquid crystals. A new mode for GHLC smart windows with intermediate initial transmittance was established by controlling the pretilt angle.
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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