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A leaf-like structured membrane for highly efficient and persistent radiative cooling.

Minghan Wu1,2, Yu Li1,2, Gang Huang1,2

  • 1Key Laboratory of Polymer Processing Engineering of the Ministry of Education, National Engineering Research Center of Novel Equipment for Polymer Processing, Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing, South China University of Technology, Guangzhou 510641, People's Republic of China. guizhenzhang@scut.edu.cn.

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Summary
This summary is machine-generated.

This study introduces a novel double-layer passive radiative cooling (PRC) membrane that overcomes UV degradation. The leaf-inspired design achieves high cooling performance and durability for practical applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive daytime radiative cooling (PRC) is a promising technology for mitigating global warming effects.
  • Current PRC materials face limitations in balancing high cooling efficiency with long-term ultraviolet (UV) durability.
  • UV degradation compromises the performance and lifespan of existing radiative cooling solutions.

Purpose of the Study:

  • To develop a novel double-layer passive radiative cooling (PRC) porous membrane with enhanced UV durability and high cooling performance.
  • To address the critical challenge of UV degradation in PRC materials.
  • To create a cost-effective and scalable solution for passive cooling.

Main Methods:

  • Fabrication of a double-layer porous membrane with distinct upper protective and bottom cooling layers.
  • Incorporation of UV-reflective inorganic particles in the upper layer and optically characterized particles in the bottom layer.
  • Evaluation of optical properties (solar reflectivity, MIR emissivity) and mechanical stability under accelerated UV radiation testing.

Main Results:

  • The developed PRC membrane exhibits a high solar reflectivity of 99.3% and a mid-infrared (MIR) emissivity of approximately 95%.
  • The membrane demonstrated excellent optical and mechanical stability after exposure to 7000 MJ m-2 of UV radiation.
  • The leaf-like structure and synergistic particle effects contribute to superior performance and durability.

Conclusions:

  • The novel double-layer PRC membrane effectively overcomes the UV durability limitations of conventional radiative cooling materials.
  • The unique structural design and excellent comprehensive performance pave the way for widespread practical applications of PRC technology.
  • This advancement offers a sustainable solution for energy efficiency and thermal management.