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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
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A Surface-Micellar-Assembled Aerogel for Efficient Building Cooling.

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  • 1Shanghai High Performance Fibers and Composites Center (Province-Ministry Joint), College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China.

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Summary

This study presents a new composite material for passive daytime radiative cooling (PDRC). The advanced aerogel material offers high solar reflectance and infrared emissivity for sustainable building temperature regulation.

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Area of Science:

  • Materials Science
  • Sustainable Energy
  • Nanotechnology

Background:

  • Passive daytime radiative cooling (PDRC) offers a sustainable solution for building temperature regulation and global carbon neutrality.
  • Current PDRC materials often face challenges with particle dispersion stability in polymer matrices, hindering practical use.

Purpose of the Study:

  • To develop a novel composite material with enhanced passive daytime radiative cooling performance.
  • To address the limitations of poor dispersion stability in existing PDRC materials.

Main Methods:

  • Synthesized a composite material using thermally initiated polymerization of acrylamide and calcium ion cross-linking of sodium alginate.
  • Incorporated sodium dodecyl sulfate to induce self-assembly and phase separation for improved dispersion and reflectance.
  • Utilized freeze-drying to create a 3D skeletal semi-interpenetrating aerogel structure (SAM/SDS-M).

Main Results:

  • The resulting SAM aerogel achieved high solar reflectance (0.8934) and infrared emissivity (0.9822) within the atmospheric window.
  • Outdoor experiments showed an average indoor temperature difference of 4.04 °C compared to uncovered samples.
  • Demonstrated a daytime cooling temperature drop of 8.54 °C under 1040 W/m² solar irradiance, alongside good mechanical strength and thermal insulation.

Conclusions:

  • The developed SAM/SDS-M aerogel exhibits excellent PDRC performance, offering a promising solution for sustainable building cooling.
  • The strategy of using self-assembly and phase separation provides a pathway for designing stable and high-performance PDRC materials.
  • This work contributes to the advancement of practical and efficient PDRC technologies for energy savings and environmental benefits.