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Structural Porous Ceramic for Efficient Daytime Subambient Radiative Cooling.

Jieyan Zhao1,2, Qing Meng1, Yong Li1

  • 1Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

ACS Applied Materials & Interfaces
|September 26, 2023
PubMed
Summary
This summary is machine-generated.

A novel porous silicon nitride-boron nitride ceramic offers passive building cooling. This material achieves significant subambient temperatures and high mechanical strength, overcoming limitations of previous cellulose-based options.

Keywords:
combustion synthesisporous ceramicsradiative coolingstructural materialsweather resistance

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive radiative cooling offers energy-free building climate control.
  • Cellulose-based composites show promise but lack durability and flame resistance.
  • Advanced structural materials are needed for efficient and reliable radiative cooling.

Purpose of the Study:

  • To develop a durable, high-performance structural material for passive radiative cooling.
  • To address the limitations of existing cellulose-based radiative cooling materials.
  • To investigate the potential of silicon nitride-boron nitride ceramics for building applications.

Main Methods:

  • One-step combustion synthesis of porous silicon nitride-boron nitride (Si3N4-BN) ceramic.
  • Characterization of optical properties (solar reflectivity, atmospheric window emissivity).
  • Evaluation of mechanical strength (flexural and compressive) and thermal insulation.

Main Results:

  • Achieved high solar reflectivity (~0.95) and atmospheric window emissivity (~0.95).
  • Demonstrated subambient radiative cooling performance of 5.14 °C under direct sunlight.
  • Exhibited excellent mechanical properties with flexural strength of 31.07 MPa and compressive strength of 65.36 MPa.

Conclusions:

  • Porous Si3N4-BN ceramic is a promising material for passive radiative cooling.
  • The material offers superior durability and mechanical strength compared to cellulose-based alternatives.
  • It shows significant potential for building cooling in demanding environments like tropical deserts and islands.