期刊
ACS NANO
卷 14, 期 8, 页码 10600-10607出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c04686
关键词
silk nanofibrils; surface charge; ionic rectification; electricity generation; asymmetric materials
类别
资金
- National Natural Science Foundation of China [21474125, 51608509]
- Shandong Taishan Youth Scholar Program
- QIBEBT & Dalian National Laboratory for Clean Energy (DNL), CAS [QIBEBT I201916, DICPQIBEBT UN201808]
- Shandong Collaborative Innovation Centre for marine biomass fiber materials and textiles
Protein nanostructures in living organisms have attracted intense interests in biology and material science owing to their intriguing abilities to harness ion transportation for matter/signal transduction and bioelectricity generation. Silk nanofibrils, serving as the fundamental building blocks for silk, not only have the advantages of natural abundance, low cost, biocompatibility, sustainability, and degradability but also play a key role in mechanical toughness and biological functions of silk fibers. Herein, cationic silk nanofibrils (SilkNFs), with an ultrathin thickness of similar to 4 nm and a high aspect ratio up to 500, were successfully exfoliated from natural cocoon fibers via quaternization followed by mechanical homogenization. Being positively charged in a wide pH range of 2-12, these cationic SilkNFs could combine with different types of negatively charged biological nanofibrils to produce asymmetric ionic membranes and aerogels that have the ability to tune ion translocation. The asymmetric ionic aerogels could create an electric potential as high as 120 mV in humid ambient air, whereas asymmetric ionic membranes could be used in ionic rectification with a rectification ratio of 5.2. Therefore, this green exfoliation of cationic SilkNFs may provide a biological platform of nanomaterials for applications as diverse as ion electronics, renewable energy, and sustainable nanotechnology.
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