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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
Published on: February 27, 2019
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Temperature Self-Adaptive and Color-Adjustable Smart Window Based on Templated Cholesteric Liquid Crystals.
1National Engineering Lab for TFT-LCD Materials and Technologies, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Polymers
|January 11, 2024
Summary
Smart windows using cholesteric liquid crystals (CLCs) adapt to temperature and adjust color. These templated CLC devices offer dynamic thermal management and visible spectrum control for energy conservation.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Cholesteric liquid crystals (CLCs) possess helical superstructures enabling selective reflection.
- Reconfigurable templates facilitate molecular assembly for integrated functions.
- Smart window technology aims for adaptive thermal and visual properties.
Purpose of the Study:
- To develop temperature self-adaptive and color-adjustable smart windows using cholesteric liquid crystals (CLCs).
- To investigate the tunable reflection bands in both visible and infrared spectra via thermal and electrical actuation.
- To assess the potential of templated CLC smart windows for energy conservation and biological clock regulation.
Main Methods:
- Fabrication of CLC smart windows utilizing a templating method.
- Characterization of simultaneous reflection bands in visible and infrared spectra.
- Evaluation of reversible adjustments in reflection bands via temperature and electric field stimuli.
Main Results:
- Adjustable infrared reflection bands (950-1305 nm) via temperature and (1150-950 nm) via electric field.
- Visible spectrum color shifts (530-650 nm) with temperature and (530-440 nm) with electric field.
- Demonstrated temperature variation of 10.3 °C within 55 s and effective thermal regulation.
Conclusions:
- Templated CLC smart windows exhibit dynamic control over thermal and visual properties.
- The technology shows promise for energy conservation through automatic thermal management.
- Potential applications include biological clock regulation due to dynamic color adjustment.
