Abstract
Smart windows can dynamically and adaptively adjust the light transmittance in non-energy or low-energy ways to maintain a comfortable ambient temperature, which are conducive to efficient use of energy. This work proposes a liquid crystal (LC) smart window with highly efficient near-infrared (NIR) response using carbon nanotubes grafted by biphenyl LC polymer brush (CNT-PDB) as the orientation layer. The resultant CNT-PDB polymer brush can provide the vertical orientation of LC molecules to maintain the initial transparency. At the same time, the smart window shows a rapid response to NIR light, which can quickly adjust the light transmittance to prevent sunlight from entering the room. Different from common doping systems, this method avoids the problem of poor compatibility between the LC host and photothermal conversion materials, which is beneficial for improving the durability of the device.
Highlights
Due to increasingly serious global warming, constructing comfortable living environments with a cozy somatosensory temperature for humans has become a high-attention issue requiring continuous improvements [1,2,3,4]
The NIR photothermal polymer brush CNT-PDB was synthesized according to our previously reported work, and detailed information about the synthetic process is shown in the Supporting Information
The results showed that the CNTPDB polymer brush sufficiently satisfied the requirements of the polymer stabilized LC (PSLC) smart window
Summary
Due to increasingly serious global warming, constructing comfortable living environments with a cozy somatosensory temperature for humans has become a high-attention issue requiring continuous improvements [1,2,3,4]. Compared with electrically active smart windows, the thermal-responsive passive mode can automatically adjust the light transmittance without external energy input through the variation in the external environmental temperature [28,29,30,31]. The multi-responsive smart window, with high transmittance and NIR light-responsive ability, has been successfully constructed with photothermal conversion materials such as inorganic nanomaterials [33,34,35]. NIR shielding are realized switching from themost initialLC transparency to thewith high-scattering stateproperties when illuminated by NIR by light doping with photothermal materials Their durability is seriously af- by [40].
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