Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 41, Pages 49017-49026Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13974
Keywords
halloysite; selective grafting; bubble thrust; Fenton degradation; facile strategy
Funding
- National Natural Science Foundation of China [51874145]
- Scientific and Technological Developing Scheme of Jilin Province [20200401028GX]
- China Ocean Mineral Resources R&D Association (COMRA) Special Foundation [DY135-R2-1-01, DY135-46]
- Province/Jilin University co-construction project - funds for new materials [SXGJSF2017-3]
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Inspired by nature, catalytically self-propelled nanojets made from tubular clay minerals were developed, showing efficient movement and collective behavior in catalyzing Fenton degradation reactions. Guided motion was achieved through magnetic manipulation of the nanojets.
Taking inspirations from nature, we endeavor to develop catalytically self-propelled nanojets from a type of tubular clay minerals, halloysite nanotubes (HNTs), and utilize them as catalysts targeted for catalysis where the traditional means of mechanical agitation cannot be implemented. Nanojets of Fe3O4@ HNTs/Pt were prepared by impregnating platinum nanoparticles (Pt NPs) in lumens of HNTs and selective grafting of magnetite (Fe3O4) particles on the external surface. The HNT-based nanojets were validated to be highly suitable both in free bulk solution and in microfluidic flow. An example of Fenton degradation catalyzed by these jets was demonstrated. The powerful movement of Fe3O4@HNTs/Pt (368 +/- 50 mu m.s(-1)) fueled by 5.0% wt. H2O2 was found to follow a bubble propulsion mechanism, and the motion exhibits collective behavior as swarms. The clay tubes were for the first time observed to self-assemble into fish-like aggregates during swimming, reflecting natural occurrence of motion-evolution philosophy. Guided motion was realized by employing magnetic manipulation which makes jets feasible for reactors with complex microchannels/reactors.
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