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Supramolecularly Connected Armor-like Nanostructure Enables Mechanically Robust Radiative Cooling Materials
Peng Zhou1, Yuyan Wang2, Xinxing Zhang1
1State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
Nano Letters
|May 17, 2024
Summary
This study presents a novel bioinspired material for passive daytime radiative cooling (PDRC). The developed nanostructured film achieves significant cooling with excellent durability and mechanical strength.
Area of Science:
- Materials Science
- Nanotechnology
- Sustainable Energy
Background:
- Passive daytime radiative cooling (PDRC) offers energy-free thermal management.
- Challenges exist in creating PDRC materials with integrated solar reflectivity, durability, and mechanical strength.
Purpose of the Study:
- To develop a robust, nanostructured PDRC material inspired by pangolin armor.
- To overcome limitations in current polymeric PDRC composites.
Main Methods:
- Utilized supramolecular bonds between TiO2-decorated mica microplates and cellulose nanofibers.
- Fabricated interlayer nanostructured PDRC materials with hierarchical nanophotonic structures.
Main Results:
- Achieved high solar reflectivity (92%) and emissivity (91%).
- Demonstrated a significant temperature drop of 10 °C under direct sunlight.
- Exhibited high strength (41.7 MPa), toughness (10.4 MJ m⁻³), and environmental durability.
Conclusions:
- The bioinspired strategy enables the design of high-performance polymeric PDRC materials.
- This approach offers a blueprint for advanced functional materials in soft robots and wearable devices.
Keywords:
bioinspired materialsinterlayer nanostructuremechanical propertiespassive daytime radiative cooling (PDRC)supramolecular interactions
