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<p>The advancement of sophisticated smart windows exhibiting superior thermoregulation capabilities in both solar spectrum and long-wave infrared range maintains a prominent objective for researchers in this field. In this study, a Janus window is proposed and prepared based on polymer-stabilized liquid–crystal films/thermochromic materials. It can achieve switchable front long-wave infrared emissivity (<i>ε</i><sub>Front</sub>) and solar modulation ability (Δ<i>T</i><sub>sol</sub>) through dynamic flipping, making it suitable for different seasonal energy-saving requirements. Outdoor experiments show that under daytime illumination, the indoor temperature decreases by 8&#xa0;°C, and the nighttime temperature drops by 5&#xa0;°C. MATLAB simulation calculations indicate that the daytime cooling power is 93&#xa0;W m<sup>−2</sup>, while the nighttime cooling power reaches 142&#xa0;W m<sup>−2</sup>. Interestingly, by modifying the conductive layer, it can effectively shield electromagnetic radiation (within the X-band frequency range (8.2–12.4) GHz). Energy simulation reveals the substantial superiority of this device in energy savings compared with single-layer polymer-stabilized liquid crystal, poly(N-isopropyl acrylamide), and normal glass when applied in different climate zones. This research presents a compelling opportunity for the development of sophisticated smart windows characterized by exceptional thermoregulation capabilities.</p>

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A Janus Smart Window for Temperature-Adaptive Radiative Cooling and Adjustable Solar Transmittance

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月27日

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  • Zuowei Zhang,
  • Meina Yu,
  • Cong Ma,
  • Longxiang He,
  • Xian He,
  • Baohua Yuan,
  • Luoning Zhang,
  • Cheng Zou,
  • Yanzi Gao,
  • Huai Yang

摘要

The advancement of sophisticated smart windows exhibiting superior thermoregulation capabilities in both solar spectrum and long-wave infrared range maintains a prominent objective for researchers in this field. In this study, a Janus window is proposed and prepared based on polymer-stabilized liquid–crystal films/thermochromic materials. It can achieve switchable front long-wave infrared emissivity (εFront) and solar modulation ability (ΔTsol) through dynamic flipping, making it suitable for different seasonal energy-saving requirements. Outdoor experiments show that under daytime illumination, the indoor temperature decreases by 8 °C, and the nighttime temperature drops by 5 °C. MATLAB simulation calculations indicate that the daytime cooling power is 93 W m−2, while the nighttime cooling power reaches 142 W m−2. Interestingly, by modifying the conductive layer, it can effectively shield electromagnetic radiation (within the X-band frequency range (8.2–12.4) GHz). Energy simulation reveals the substantial superiority of this device in energy savings compared with single-layer polymer-stabilized liquid crystal, poly(N-isopropyl acrylamide), and normal glass when applied in different climate zones. This research presents a compelling opportunity for the development of sophisticated smart windows characterized by exceptional thermoregulation capabilities.