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Applied Physics Letters / Volume 94 / Issue 16 / PLASMAS AND ELECTRICAL DISCHARGES

Appl. Phys. Lett. 94, 161501 (2009); http://dx.doi.org/10.1063/1.3122148 (3 pages)

Disinfection of E. coli by nonthermal microplasma electrolysis in normal saline solution

Yukinori Sakiyama1, Takaaki Tomai2, Masaru Miyano3, and David B. Graves1

1Department of Chemical Engineering, University of California, Berkeley, California 94720, USA
2Department of Advanced Materials Science, The University of Tokyo, Chiba 277-8561, Japan
3Life Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

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(Received 2 March 2009; accepted 30 March 2009; published online 20 April 2009)

We present a unique method to inactivate microorganisms in 0.9% NaCl solution (normal saline solution) by means of microplasmas. The device consists of a thin titanium wire covered by a glass tube for insulation except the tip and a ground electrode. Application of an asymmetric high-frequency, high voltage results in the formation of microbubbles at both electrodes. Repetitive light emission is observed in the vicinity of the powered electrode. We employed E. coli bacteria to investigate the disinfection efficiency of the device. More than 99.5% of E. coli were deactivated in 180 s. The survival curve showed biphasic behavior.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

biological techniques, cellular biophysics, electrochemical electrodes, electrolysis, microorganisms, spectrochemical analysis, titanium

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3122148

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    K. R. Stalder, J. Woloszko, I. G. Brown, and C. D. Smith, Appl. Phys. Lett. 79, 4503 (2001)APPLAB000079000027004503000001.

    A. Vankov and D. Palanker, J. Appl. Phys. 101, 124701 (2007)JAPIAU000101000012124701000001.

    O. Sakai, M. Kimura, T. Shirafuji, and K. Tachibana, Appl. Phys. Lett. 93, 231501 (2008)APPLAB000093000023231501000001.


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