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Sustainable Radiative Cooling of Microstructure Modulated Flexible poly(lactic Acid) Films.

Mingfei Fan1, Yangzhe Hou1,2, Han Jia1

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Researchers developed a flexible polylactide film for passive cooling. This polymer microstructure technology achieves significant temperature reduction, offering a sustainable solution for cooling applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Optimizing polymer microstructures for resonant light scattering is key for passive cooling.
  • Precise microstructural control for radiative cooling materials is technically challenging.

Purpose of the Study:

  • To present a strategy for fabricating polylactide (PLA) radiative cooling film with adjustable microstructure.
  • To investigate the effect of microstructural control on optical properties and cooling performance.

Main Methods:

  • Fabrication of PLA film using polyethylene glycol (PEG) to control surface pore and internal spherical structures.
  • Characterization of the film's optical properties, cooling power, and mechanical properties.

Main Results:

  • Achieved a cooling power of 50.4 W·m-2 under 820 W·m-2 solar irradiation.
  • Demonstrated average daytime and nighttime temperature reductions of 5.2 °C and 7.6 °C, respectively.
  • The film exhibited a tensile strength of 3.84 MPa, 32.1% elongation at break, and paper-like flexibility.

Conclusions:

  • The developed PLA film offers tunable optical properties through controlled microstructures.
  • The film shows significant potential for passive cooling in construction and equipment.
  • This represents a sustainable approach for next-generation flexible radiative cooling solutions.