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Ultralight Flexible Collagen Fiber Based Aerogels Derived from Leather Solid Waste for High Electromagnetic
Bin Lyu1,2,3, Zhuo Guo1,2,3, Dangge Gao1,2,3
1College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|April 18, 2024
Summary
Researchers developed ultralight, flexible aerogels from leather waste for electromagnetic interference (EMI) shielding. These eco-friendly materials offer high shielding effectiveness, demonstrating a sustainable solution for advanced electronic applications.
Area of Science:
- Materials Science
- Nanotechnology
- Biotechnology
Background:
- High-performance electromagnetic interference (EMI) shielding materials are crucial for advanced wireless technologies.
- Developing lightweight, flexible, and cost-effective shielding solutions remains a significant challenge.
- Biomass-derived materials offer a sustainable pathway for novel functional materials.
Purpose of the Study:
- To design and fabricate ultralight, flexible aerogels from biomass for effective EMI shielding.
- To investigate the structural and electrical properties of collagen fiber/poly(vinyl alcohol) (PVA)/silver nanowire (AgNW) aerogels.
- To enhance the performance of these aerogels through hydrophobic modification.
Main Methods:
- A three-stage process involving freeze-drying, silver nanowire adsorption, and hydrophobic modification (using 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane - POTS).
- Utilizing collagen fibers from leather solid waste and poly(vinyl alcohol) (PVA).
- Characterization using scanning electron microscopy (SEM) to analyze the conductive network formation.
Main Results:
- Formation of an interweaving conductive network of AgNWs within the collagen fiber/PVA porous structure.
- Achieved electrical conductivity of 10^3 S·m^-1.
- Demonstrated EMI shielding effectiveness exceeding 62 dB with a density of 5.8 mg/cm^3.
- Hydrophobically modified aerogels (collagen fiber/PVA/AgNWs/POTS) reached 73 dB shielding efficiency and a 147° water contact angle.
Conclusions:
- Leather solid waste can be transformed into highly efficient, cost-effective, and eco-friendly EMI shielding aerogels.
- The developed aerogels exhibit superior performance compared to conventional shielding materials.
- This approach highlights the potential of waste valorization for sustainable material development.
