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Open AccessArticle

Antibacterial Effects of Magnetically-Controlled Ag/Fe3O4 Nanoparticles

1
Key Laboratory of Process Monitoring and System Optimization for Mechanical and Electrical Equipment in Fujian Province, Huaqiao University, Xiamen 361021, China
2
Department of Mechanical Engineering, Chung Yuan Christian University, Chung Li 32023, Taiwan
3
Department of Bioscience Technology, Chung Yuan Christian University, Chung Li 32023, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2018, 11(5), 659; https://doi.org/10.3390/ma11050659
Received: 11 April 2018 / Revised: 21 April 2018 / Accepted: 23 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Selected Papers from IMETI2016)
This paper presents the use of a magnetic manipulation device to remotely control the movement of Ag/Fe3O4 nanoparticles (NPs) for enhancing the antibacterial effect of Ag particles in aqueous suspensions containing Escherichia coli (E. coli). The Ag/Fe3O4 magnetic NPs were prepared by co-precipitation method where the Ag particles are simultaneously synthesized with the Fe3O4 particles to form Ag and Fe3O4 nanocomposite materials. The manipulation system utilized a homogeneous rotating magnetic field to carry out magnetic stirring of NPs in the petri dishes containing bacterial suspensions. The optimum magnetron parameters and best antibacterial effects were implemented with six different concentrations from 0.6 wt % to 6.6 wt % of the NPs at driving frequencies from 50 rpm to 200 rpm for 3 min. The highest antibacterial effect of 99.4% was achieved at 5.4 wt % of NPs and the driving frequency of 100 rpm. A time-dependent antibacterial effect in 0.1 wt % of Ag/Fe3O4 was also observed. The results indicate that the use of specific rotating magnetic fields to manipulate Ag/Fe3O4 magnetic NPs can significantly improve the antibacterial efficacy. Due to the good biocompatibility of the Ag NPs, the presented technique can be applied to clean water resources in the future. View Full-Text
Keywords: Ag/Fe3O4 nanoparticles; rotating magnetic field; Escherichia coli; antibacterial effect Ag/Fe3O4 nanoparticles; rotating magnetic field; Escherichia coli; antibacterial effect
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MDPI and ACS Style

Chang, M.; Lin, W.-S.; Xiao, W.; Chen, Y.-N. Antibacterial Effects of Magnetically-Controlled Ag/Fe3O4 Nanoparticles. Materials 2018, 11, 659.

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