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Highly Sunlight Reflective and Infrared Semi-Transparent Nanomesh Textiles.

Gunwoo Kim1, Kyuin Park2, Kyung-Jun Hwang3

  • 1Biomedical Manufacturing Technology Center, Korea Institute of Industrial Technology, Yeongcheon 38822, Republic of Korea.

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|October 18, 2021
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Summary
This summary is machine-generated.

Textile structure engineered at the nanoscale enables significant radiative cooling. This nanomesh fabric blocks sunlight while allowing heat to escape, achieving up to a 12°C cooling effect for enhanced thermal comfort.

Keywords:
Mie scatteringelectrospinningradiative coolingtextilethermal comfort

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Area of Science:

  • Materials Science
  • Thermal Engineering
  • Optics

Background:

  • Radiative cooling in textiles is crucial for human thermal comfort, especially in intense sunlight.
  • High near-infrared (NIR) reflectance and infrared (IR) transmittance are desirable for blocking solar heat and enabling body heat emission.

Purpose of the Study:

  • To demonstrate nanoscale geometric control of textile structure for achieving desirable NIR and IR optical properties.
  • To investigate the potential of nanomesh textiles for significant radiative cooling performance.

Main Methods:

  • Simulated Mie scattering events in fibers based on diameter.
  • Examined a nonwoven nanomesh textile made of PVDF electrospun fibers (∼600 nm diameter).
  • Measured solar/NIR reflectance and IR transmittance, and cooling effect on simulated skin.

Main Results:

  • Achieved over 90% solar and NIR reflectance, blocking sunlight energy.
  • Demonstrated ∼50% IR transmittance for efficient radiative heat dissipation.
  • Observed a significant cooling effect of up to 12°C compared to conventional textiles.

Conclusions:

  • Nanoscale geometric control of textile structure alone can achieve high NIR reflectance and IR transmittance.
  • The developed nanomesh textile exhibits powerful radiative cooling and IR transmitting capabilities.
  • This technology offers efficient management of solar radiation for cooling persons, devices, and vehicles, saving energy.