Du Yuwei, Liu Sai, Li Yang, Chen Xu, Ho Tsz Chung, Chao Luke Christopher, Tso Chi Yan
School of Energy and Environment, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong 999077, Hong Kong, China.
State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310058, China.
ACS Appl Mater Interfaces. 2023 Oct 25;15(42):49665-49677. doi: 10.1021/acsami.3c11706. Epub 2023 Oct 17.
Transparent wood (TW) has emerged as a sustainable alternative to conventional glass as an energy-efficient window glazing material owing to its exceptional optical transparency and superior mechanical and thermal performances. However, it is challenging to develop the TW-based color-switching smart windows with both high optical performance and mechanical strengths. In this work, an optically switchable and mechanically robust perovskite-coated thermochromic transparent wood (PTTW) is developed for use as smart windows to achieve an effective solar modulation and thermal management. PTTW exhibits a substantial solar modulation ability Δτ of 21.6% and a high clear-state luminous transmittance τ of 78.0%, which enable an efficient thermal regulation while ensuring high visual clarity. PTTW also offers enhanced mechanical properties (i.e., tensile strength σ = 71.4 MPa and flexural strength σ = 93.1 MPa) and improved thermal properties [i.e., thermal conductivity = 0.247 W/(m·K) and heat capacity = 1.69 J/(g·°C)] compared to glass-based smart windows, as well as excellent performance stability (i.e., 200 heating-cooling cycles), manifesting its applicability in real building scenarios. In addition, PTTW also demonstrates a remarkable thermal-regulating performance (i.e., 5.44 °C indoor air temperature regulation) and an energy-saving potential (i.e., 12.9% heating, ventilation, and air conditioning energy savings) in Hong Kong. Overall, this study contributes to the progression toward energy-efficient and sustainable buildings.
透明木材（TW）因其卓越的光学透明度以及出色的机械和热性能，已成为一种可持续的传统玻璃替代品，可作为节能窗玻璃材料。然而，开发兼具高光学性能和机械强度的基于透明木材的变色智能窗具有挑战性。在这项工作中，开发了一种具有光学可切换性和机械坚固性的钙钛矿涂层热致变色透明木材（PTTW），用作智能窗以实现有效的太阳辐射调节和热管理。PTTW展现出21.6%的显著太阳辐射调节能力Δτ和78.0%的高透明态透光率τ，这使其在确保高视觉清晰度的同时能够进行高效的热调节。与基于玻璃的智能窗相比，PTTW还具有增强的机械性能（即拉伸强度σ = 71.4 MPa和弯曲强度σ = 93.1 MPa）以及改善的热性能[即热导率 = 0.247 W/(m·K)和比热容 = 1.69 J/(g·°C)]，以及出色的性能稳定性（即200次加热 - 冷却循环），表明其在实际建筑场景中的适用性。此外，PTTW在香港还展现出显著的热调节性能（即室内空气温度调节5.44°C）和节能潜力（即供暖、通风和空调节能12.9%）。总体而言，这项研究有助于推动向节能和可持续建筑的发展。
