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High-Performance Radiative Cooling Sunscreen.

Jiaqi Xu1, Xueke Wu1, Yunrui Li1

  • 1Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.

Nano Letters
|November 15, 2024
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Summary
This summary is machine-generated.

This study introduces a novel radiative cooling (RC) sunscreen for effective outdoor skin cooling and UV protection. The RC sunscreen significantly lowers skin temperature compared to commercial options and bare skin.

Keywords:
Mie scatteringTiO2 nanoparticlesradiative coolingsunscreen

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Area of Science:

  • Materials Science
  • Thermal Engineering
  • Biomedical Engineering

Background:

  • Radiative cooling offers zero-energy outdoor thermal management.
  • Current sunscreens primarily offer UV protection, not active cooling.
  • Human thermal comfort outdoors is a significant challenge.

Purpose of the Study:

  • To develop a radiative cooling (RC) sunscreen for enhanced skin cooling and UV protection.
  • To evaluate the performance of the RC sunscreen in various outdoor conditions.
  • To assess the durability and biocompatibility of the developed sunscreen.

Main Methods:

  • Fabrication of an RC sunscreen with specific optical properties (low UV transmissivity, high solar reflectivity, high mid-infrared emissivity).
  • Performance testing under different outdoor scenarios (humidity, cloud cover).
  • Evaluation of UV stability, water resistance, working life, and biocompatibility.

Main Results:

  • The RC sunscreen achieved low UV transmissivity (4.86%), high solar reflectivity (90.19%), and high mid-infrared emissivity (92.09%).
  • It reduced skin temperature by 2.3–6.1 °C compared to commercial sunscreens and 4.2–6.0 °C compared to bare skin.
  • The sunscreen demonstrated good UV stability, water resistance, longevity, and biocompatibility.

Conclusions:

  • The developed RC sunscreen effectively provides both UV protection and significant skin cooling.
  • Its performance across various conditions and favorable properties suggest strong commercial potential.
  • This technology offers a promising solution for outdoor human thermal management.