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Updated: May 28, 2025

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Turning Discarded Oyster Shells into Sustainable Passive Radiative Cooling Films.

Junghwan Lee1, Dae Kyom Kim1, Daeyul Kwon1

  • 1Department of Advanced Materials Engineering, Chung-Ang University, Anseong 17546, Republic of Korea.

Polymers
|February 13, 2025
PubMed
Summary

This study developed a sustainable passive radiative cooling (PRC) film using oyster shell waste. The novel PU/D-CaCO3 film achieves significant cooling, reducing temperatures by up to 7°C, offering an eco-friendly solution.

Keywords:
calcium carbonatecooling performancediscarded oyster shellmarine pollutionradiative cooling

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Area of Science:

  • Materials Science
  • Sustainable Engineering
  • Environmental Science

Background:

  • Current inorganic materials for passive radiative cooling (PRC) lack sustainability and recyclability.
  • There is a need for eco-friendly cooling solutions to reduce energy consumption and greenhouse gas emissions.

Purpose of the Study:

  • To develop a novel, sustainable passive radiative cooling (PRC) film.
  • To utilize waste materials, specifically discarded oyster shells, for cooling applications.
  • To demonstrate the effectiveness and environmental benefits of the developed PRC film.

Main Methods:

  • Extraction of calcium carbonate (CaCO3) from discarded oyster shells (D-CaCO3).
  • Fabrication of a composite film using D-CaCO3 and polyurethane (PU) as the matrix.
  • Characterization of optical properties (solar reflectance, infrared emissivity) and thermal performance through experimental and simulation methods (FDTD).

Main Results:

  • The PU/D-CaCO3 film exhibits high solar reflectance and 95% emissivity in the atmospheric window.
  • The film achieved temperatures up to 7°C lower than the ambient environment under 650 W/m2 solar irradiance.
  • Outperformed conventional white paint and pure PU in cooling performance, demonstrating significant temperature differences.

Conclusions:

  • The developed PU/D-CaCO3 film offers a sustainable and eco-friendly passive radiative cooling solution.
  • Utilizing marine waste (oyster shells) for cooling aligns with waste utilization and carbon sequestration goals.
  • The research highlights the commercial viability and environmental benefits of using marine-derived materials in passive cooling technologies.