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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method
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A Dual Photonic Structure with Beaded Networks and Core-Shell Nanoparticles for Ultrathin yet High-Performance

Weizhen Zhang1, Qian Yan1, Wenqian He1

  • 1State Key Laboratory of Advanced Separation Membrane Materials, College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

ACS Applied Materials & Interfaces
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PubMed
Summary

Developing energy-free passive daytime radiative cooling (PDRC) coatings offers a sustainable solution to global warming. This study presents an ultrathin PDRC film achieving high solar reflectance and emissivity for effective cooling with enhanced durability.

Keywords:
beaded network structurecore−shell nanoparticlespassive daytime radiative coolingsuperhydrophobicultrathin

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive daytime radiative cooling (PDRC) is crucial for mitigating energy consumption and global warming.
  • Conventional PDRC coatings are thick, costly, and have high thermal resistance.
  • Developing ultrathin PDRC films with high solar reflectance and emissivity is a significant challenge.

Purpose of the Study:

  • To design and fabricate an ultrathin PDRC film with superior cooling performance.
  • To address the limitations of conventional thick PDRC coatings.
  • To explore a novel dual photonic structure for advanced radiative cooling materials.

Main Methods:

  • Fabrication of a dual photonic structure using porous poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)) film and Al2O3@SiO2 core-shell nanoparticles.
  • Characterization of optical properties, including solar reflectance (Rs) and long-wavelength infrared emissivity (εLWIR).
  • Outdoor testing to evaluate cooling performance under solar irradiance and assess durability and self-cleaning capabilities.

Main Results:

  • An ultrathin film (∼150 μm) achieved a solar reflectance of 94.2% and an emissivity of 0.972.
  • Demonstrated a maximum cooling effect of 18.8 °C under solar irradiance (850-900 W/m²).
  • Achieved a net radiative cooling power of 206-216 W/m² and maintained performance after two months of outdoor exposure due to its superhydrophobic surface.

Conclusions:

  • The developed dual photonic structure offers an innovative approach for ultrathin, high-performance PDRC materials.
  • The PDRC film exhibits excellent cooling efficiency, durability, and self-cleaning properties.
  • This technology holds significant promise for energy-free cooling applications and combating global warming.