Bio-inspired Mechanically Responsive Smart Windows for Visible and Near-Infrared Multiwavelength Spectral Modulation.

Adv Mater

Shenzhen Key Laboratory of Sustainable Biomimetic Materials, Guangdong Provincial Key Laboratory of Sustainable Biomimetic Materials and Green Energy, Department of Materials Science and Engineering, Institute of Innovative Materials, Guangming Advanced Research Institute, Southern University of Science and Technology, Shenzhen, 518055, China.

Published: October 2024

AI Article Synopsis

  • - The new mechanochromic light control technology aims to create energy-saving windows that adjust to solar irradiation but faces challenges in selective modulation for various scenarios.
  • - A layer-by-layer assembly method is introduced to produce a film that responds mechanically, allowing for dynamic modulation of visible and near-infrared light, with optical modulation rates of up to 42.4% at 550 nm.
  • - The multilayer structure enhances both the film's optical performance and its durability, surviving up to 100,000 stretching cycles, and demonstrates a cooling effect in real-world applications, potentially benefiting energy-efficient design.

Article Abstract

Mechanochromic light control technology that can dynamically regulate solar irradiation is recognized as one of the leading candidates for energy-saving windows. However, the lack of spectrally selective modulation ability still hinders its application for different scenarios or individual needs. Here, inspired by the generation of structure color and color change of living organisms, a simple layer-by-layer assembly approach toward large-area fabricating mechanically responsive film for visible and near-infrared multiwavelength spectral modulation smart windows is reported here. The assembled SiO nanoparticles and WO nanowires enable the film with an optical modulation rate of up to 42.4% at the wavelength of 550 nm and 18.4% for the near-infrared region, separately, and the typical composite film under 50% stretching shows ≈41.6% modulation rate at the wavelength of 550 nm with NIR modulation rate less than 2.7%. More importantly, the introduction of the multilayer assembly structure not only optimizes the film's optical modulation but also enables the film with high stability during 100 000 stretching cycles. A cooling effect of 21.3 and 6.9 °C for the blackbody and air inside a model house in the real environmental application is achieved. This approach provides theoretical and technical support for the new mechanochromic energy-saving windows.

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Source
http://dx.doi.org/10.1002/adma.202408192DOI Listing

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