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Quaternized Silk Nanofibrils for Electricity Generation from Moisture and Ion Rectification
Weiqing Yang1,2, Lili Lv1,3, Xiankai Li1,3
1Group of Biomimetic Smart Materials, CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Songling Road 189, Qingdao 266101, P.R. China.
ACS Nano
|August 19, 2020
Summary
Researchers developed cationic silk nanofibrils (SilkNFs) for advanced ionic applications. These sustainable nanomaterials enable efficient ion transport in membranes and aerogels for energy and electronics.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Electrochemistry
Background:
- Protein nanostructures are crucial for biological ion transport and bioelectricity.
- Silk nanofibrils offer natural abundance, biocompatibility, and mechanical properties.
- Existing methods for silk nanofibril modification are limited.
Purpose of the Study:
- To develop a green method for exfoliating cationic silk nanofibrils (SilkNFs).
- To explore the ion transport properties of SilkNF-based materials.
- To demonstrate potential applications in energy and electronics.
Main Methods:
- Quaternization of natural cocoon fibers.
- Mechanical homogenization for nanofibril exfoliation.
- Fabrication of asymmetric ionic membranes and aerogels using SilkNFs.
Main Results:
- Successfully exfoliated ultrathin cationic SilkNFs (∼4 nm thickness, aspect ratio up to 500).
- SilkNFs exhibited positive charge across a wide pH range (2-12).
- Asymmetric ionic aerogels generated 120 mV electric potential in air; membranes showed a 5.2 rectification ratio.
Conclusions:
- Green exfoliation of cationic SilkNFs provides a versatile nanomaterial platform.
- SilkNFs enable tunable ion translocation for advanced applications.
- Potential applications include ion electronics, renewable energy, and sustainable nanotechnology.
