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, 8 (2), 157-164

Dual-Fuel-Driven Bactericidal Micromotor

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Dual-Fuel-Driven Bactericidal Micromotor

Ya Ge et al. Nanomicro Lett.

Abstract

In this paper, we report fabrication of the bimetallic Janus microsphere, a magnesium microsphere with a silver surface coating, through thermal evaporation technique. Because of the Janus structure, this micromotor can be propelled in two different directions by the surface silver or magnesium 'engine' and hydrogen peroxide or water fuel. In addition, due to the bactericidal property of silver, this autonomous micromotor is capable of killing bacteria in solution. As compared to the static one, the micromotor is able to kill the bacteria at a much faster rate (about nine times of that of the static one), demonstrating the superiority of the motion one. We thus believe that the micromotor shown in the current study is potentially attractive for the environmental hygiene applications.

Keywords: Bacterial killing; E. coli; Janus; Micromotor; Self-propelling.

Figures

Fig. 1
Fig. 1
Schematic illustrates the fabrication process of the Ag/Mg bimetallic Janus microsphere
Fig. 2
Fig. 2
a Schematic image of the Ag/Mg microsphere. b Scanning electron microscopy image of Ag/Mg Janus structure. Energy-dispersive X-ray analysis of the structure shown in (b) for c Mg and d Ag, respectively
Fig. 3
Fig. 3
a The autonomous movement of the Ag/Mg micromotor in 1 M NaHCO3. b– e Time-lapse images taken at 1 s interval obtained from Video S1 in the supporting information indicate a typical motion of an Ag/Mg Janus micromotor in 1 M NaHCO3. f The corresponding moving trajectory of the micromotor shown in (b– e). g Histogram of the moving velocity of the Ag/Mg Janus micromotor. h SEM image showing the morphology of the residual silver layer obtained after the complete consumption of the magnesium microsphere
Fig. 4
Fig. 4
a The propulsion of the Ag/Mg micromotor in hydrogen peroxide. b– e Time-lapse images taken at 0.5 s interval from Video S3 in the supporting information show the movement of a typical Ag/Mg Janus micromotor in hydrogen peroxide solution. f The motion trajectory of this micromotor shown in (b– e). g The histogram showing the velocity distribution
Fig. 5
Fig. 5
Fluorescence microscopic images of the stained live (a) and dead (b) E. coli bacteria after adding the moving Ag/Mg bimetallic micromotor for 10 min. Fluorescence images of the live (c) and dead (d) bacteria after treating with the same amount of static Ag/Mg microsphere for 10 min. SEM images indicate the morphology of the live (e) and dead (f) E. coli bacteria. g Percentage of the dead E. coli bacteria for the motion and static Ag/Mg microsphere. h The concentration of Ag+ released from the motion and static Ag/Mg microsphere
Fig. 6
Fig. 6
The influence of a the Mg ions and b the solution pH on the bacteria killing rate. c Time-dependent bacteria destruction. The effect of the NaHCO3 concentration on d the bacteria killing efficiency, e the micromotor speed and f the released silver ion concentration

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References

    1. Ismagilov RF, Schwartz A, Bowden N, Whitesides GM. Autonomous movement and self-assembly. Angew. Chem. Int. Ed. 2002;41(4):652–654. doi: 10.1002/1521-3773(20020215)41:4<652::AID-ANIE652>3.0.CO;2-U. - DOI
    1. Guix M, Mayorga-Martinez CC, Merkoci A. Nano/micromotors in (bio)chemical science applications. Chem. Rev. 2014;114(12):6285–6322. doi: 10.1021/cr400273r. - DOI - PubMed
    1. Sanchez S, Soler L, Katuri J. Chemically powered micro- and nanomotors. Angew. Chem. Int. Ed. 2015;54(5):1414–1444. doi: 10.1002/anie.201406096. - DOI - PubMed
    1. Sengupta S, Ibele ME, Sen A. Fantastic voyage: designing self-powered nanorobots. Angew. Chem. Int. Ed. 2012;51(34):8434–8445. doi: 10.1002/anie.201202044. - DOI - PubMed
    1. Wang J. Can man-made nanomachines compete with nature biomotors? ACS Nano. 2009;3(1):4–9. doi: 10.1021/nn800829k. - DOI - PubMed

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