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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive daytime radiative cooling (PDRC) provides zero-energy cooling but faces limitations in visual adaptability and material recyclability.
  • Existing PDRC materials often require complex structures and lack aesthetic versatility.
  • Cellulose nanocrystal (CNC) materials show promise but suffer from aggregation issues, hindering their practical application.

Purpose of the Study:

  • To develop a recyclable, visually adaptable, and highly efficient PDRC coating.
  • To overcome the aggregation and recyclability challenges of CNC-based PDRC materials.
  • To explore the potential of CNC/PVP photonic coatings for diverse applications.

Main Methods:

  • Evaporation-induced self-assembly of cellulose nanocrystals (CNC) and polyvinylpyrrolidone (PVP).
  • Fabrication of photonic coatings with structural colors.
  • Characterization of solar reflectance, infrared emissivity, and cooling performance.
  • Evaluation of material redispersibility and recyclability.

Main Results:

  • The CNC/PVP coatings exhibited vivid structural colors, high solar reflectance (82.1%), and excellent infrared emissivity (93%).
  • A maximum temperature reduction of 18.6 °C was achieved under simulated solar irradiation.
  • The coatings demonstrated robust recyclability, with regenerated materials maintaining high performance (16 °C reduction).
  • Successful application on various substrates including textiles, showing up to 15 °C body-cooling effect.

Conclusions:

  • The developed recyclable iridescent PDRC coating offers a scalable strategy for sustainable photonic materials.
  • The CNC/PVP material overcomes limitations of traditional PDRC and CNC-based coatings, enabling broader applications.
  • This work advances PDRC for energy-efficient buildings, personal cooling, and circular economy technologies.