期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 24, 页码 28301-28309出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c07462
关键词
liquid crystal; photothermal conversion; phase transition; smart window; isobutyl-substituted diimmonium borate
资金
- MOST of China [2017YFA0204504]
- NSFC [51873221, 52073292, 51673207, 51373183]
- Chinese Academy of Sciences
- Dutch research project [1A111KYSB20190072]
In this study, a photothermal dual-driven smart window was developed using a photothermal molecule called IDI. The window can modulate the transmittance by adjusting the temperature and light intensity, and has potential applications in energy saving and personalized privacy protection.
Photochromic or thermochromic liquid crystal (LC) smart windows have attracted wide attention due to their ments. There remains a challenge for the LC smart windows that can be modulated with light and temperature simultaneously owing to the difficulty in selecting photothermal molecules. Herein, we selected a photothermal molecule, isobutyl-substituted diimmonium borate (IDI), which shows excellent characteristics of a photothermal material used in smart windows, such as transparency in the visible light range with a slight brown color, good compatibility with the LC system, and excellent photothermal effect compared with common photothermal materials. Thus, a photothermal dual-driven smart window is developed by doping IDI into chiral LC mixtures, which can efficiently modulate the transmittance at different temperatures (or light intensities) by varying the phase state from the homeotropically oriented smectic phase (transparent) to the focal conic cholesteric phase (opaque). The transmittance is high (70%) when the ambient temperature is low and the light intensity is weak, allowing more sunlight to enter the room. The transmittance is low (20%) when the ambient temperature is high and the light intensity is strong, which prevents sunlight from entering the room. The proposed smart window will have a promising application in terms of energy saving and personalized privacy protection.
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