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Bio-inspired Self-Propelled Diatom Micromotor by Catalytic Decomposition of H2O2 Under Low Fuel Concentration

Abstract

Recently, active bubble-propelled micromotors have attracted great attention for fuel applications. By generating bubble-propelled micromotors, however, additional catalysts, such as Pt, Ag, and Ru, are required. These catalysts are expensive, toxic, and too unstable for wide application. To overcome these issues, in this work, we present an innovative methodology for the preparation of self-propelled motor machines using naturally occurring diatom frustules. This natural diatom motor shows effective motion in the presence of a very low concentration (0.8%) of H2O2 as a fuel at pH 7. Due to the unique 3-D anisotropic shape of the diatom, the self-propelled motor exhibited unidirectional motion with a speed of 50 μm/s, which followed pseudo first-order kinetics. It was found that a trace amount of iron oxide (Fe2O3) in diatom was converted into Fe2O3, which can act as a catalyst to achieve the facile decomposition of H2O2. Interestingly, “braking” of the unidirectional motion was observed upon treatment with EDTA, which blocked the catalytically active site. These results illustrate that the diatom catalytic micromotors have open a new era in the field of catalysis and bioengineering applications.

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Publication details

The article was received on 04 Jun 2018, accepted on 08 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8NR04534H
Citation: Nanoscale, 2018, Accepted Manuscript
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    Bio-inspired Self-Propelled Diatom Micromotor by Catalytic Decomposition of H2O2 Under Low Fuel Concentration

    A. Panda, A. S. Reddy, S. Venkateswarlu and M. Yoon, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04534H

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