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Published on: October 11, 2016
Spider-Silk-Inspired Nanocomposite Polymers for Durable Daytime Radiative Cooling
Pengcheng Yao1, Zipeng Chen1, Tianji Liu2
1National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, P. R. China.
Researchers developed durable polymer materials for passive daytime radiative cooling (PDRC) using a spider-silk-inspired design. These materials enhance mechanical strength and UV resistance without sacrificing cooling performance, paving the way for sustainable energy solutions.
Area of Science:
- Materials Science
- Nanotechnology
- Sustainable Energy
Background:
- Passive daytime radiative cooling (PDRC) materials offer energy-saving potential for sustainable development.
- Polymer-based PDRC materials are attractive due to their processability, low cost, and cooling efficiency.
- Durability issues, particularly mechanical and UV stability, hinder the large-scale application of polymer PDRC devices.
Purpose of the Study:
- To enhance the durability of polymer-based PDRC materials without compromising their cooling performance.
- To develop a general strategy for improving both mechanical stability and UV resistance in PDRC materials.
- To demonstrate a spider-silk-inspired design using nanocomposite polymers with potassium titanate nanofiber dopants.
Main Methods:
- Incorporation of potassium titanate (K2Ti6O13) nanofibers into a polymer matrix.
- Creation of a tough nanofiber/polymer interface to disperse stress.
- Utilizing K2Ti6O13's UV absorption properties to convert high-energy photons to heat.
- Testing enhanced poly(ethylene oxide) radiative coolers under continuous outdoor sunlight aging for 720 hours.
Main Results:
- Significant enhancement in mechanical properties: Young's modulus increased by 7 times.
- Marked improvement in UV resistance: UV stability increased by 12 times.
- Maintained constant solar reflectance after 720 hours of continuous outdoor aging, demonstrating excellent durability.
Conclusions:
- The spider-silk-inspired nanocomposite design effectively enhances mechanical and UV durability of polymer PDRC materials.
- Potassium titanate nanofibers provide a dual benefit of mechanical reinforcement and UV protection.
- This strategy offers a viable pathway for the large-scale practical application of durable polymer-based PDRC.
