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Experimental verification of shock sterilization for marine Vibrio sp. using microbubbles interacting with underwater shock waves

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Abstract

In this paper, shock sterilization using the motions of microbubbles induced by underwater shock waves is verified experimentally. A bio-experiment is carried out using marine Vibrio sp.. Underwater shock waves are produced by electric discharge in a semi-ellipsoidal discharge reflector. The shock waves are focused to increase the pressure that the generated microbubbles are exposed to. The microbubbles are generated independently. The microbubble generator can produce microbubbles of around 50 μm diameter by means of Kelvin–Helmholz instability and Venturi effect. Propagation behavior of shock waves and generation process of microbubbles are captured by high-speed camera. The experimental results show that the supply of microbubbles increases the potential of shock sterilization. In addition, it is found that shock waves without microbubbles also have the capacity of sterilization, and this means that cavitation bubbles generated behind converging shock waves contribute to inactivating marine bacteria.

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Acknowledgments

This work was supported by JSPS KAKENHI Grant Number 25630405. The authors would like to express their thanks to Prof. H. Mimura of Kobe University for his assistance with the bio-experiment.

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Authors and Affiliations

  1. Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe, 658-0022, Hyogo, Japan

    Jingzhu Wang & Akihisa Abe

Authors
  1. Jingzhu Wang
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  2. Akihisa Abe
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Correspondence to Akihisa Abe.

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Wang, J., Abe, A. Experimental verification of shock sterilization for marine Vibrio sp. using microbubbles interacting with underwater shock waves. J Mar Sci Technol 21, 679–688 (2016). https://doi.org/10.1007/s00773-016-0384-z

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  • DOI: https://doi.org/10.1007/s00773-016-0384-z

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