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In this study, micro/nanostructures are fabricated on the surface of 3Cr13 stainless steel via laser etching, and a superhydrophobic coating with silver nanoparticles (AgNPs) is prepared by utilizing the reduction–adsorption properties of polydopamine (PDA). We investigate the effect of soaking time from the "one-step method" on the reduction of nano-Ag, surface wettability, and antibacterial properties. Scanning electron microscopy is performed to analyze the distribution of nano-Ag on the surface, whereas X-ray energy dispersive spectroscopy and X-ray photoelectron spectroscopy are used to analyze the crystal structures and chemical compositions of different surfaces. Samples deposited with PDA on their surface are soaked in a 1H,1H,2H,2H-perfluorodecyltriethoxysilane water–alcohol solution containing AgNO3 for 3 h. Subsequently, a "one-step method" is used to prepare low-adhesion superhydrophobic surfaces containing AgNPs. As immersion progresses, more AgNPs are deposited onto the surface. Compared with the polished surface, the samples prepared via the "one-step method" show significant antibacterial properties against both gram-negative Escherichia coli and gram-positive Staphylococcus aureus. The antibacterial properties of the surface improve as immersion progresses.


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One-step modification method of a superhydrophobic surface for excellent antibacterial capability

Show Author's information Ling LAN1Yue-lan DI2( )Hai-dou WANG3( )Yan-fei HUANG2Li-na ZHU1Xu-hang LI1
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China
National Key Laboratory for Remanufacturing, Academy of Army Armored Forces, Beijing 100072, China
National Engineering Research Center for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China

Abstract

In this study, micro/nanostructures are fabricated on the surface of 3Cr13 stainless steel via laser etching, and a superhydrophobic coating with silver nanoparticles (AgNPs) is prepared by utilizing the reduction–adsorption properties of polydopamine (PDA). We investigate the effect of soaking time from the "one-step method" on the reduction of nano-Ag, surface wettability, and antibacterial properties. Scanning electron microscopy is performed to analyze the distribution of nano-Ag on the surface, whereas X-ray energy dispersive spectroscopy and X-ray photoelectron spectroscopy are used to analyze the crystal structures and chemical compositions of different surfaces. Samples deposited with PDA on their surface are soaked in a 1H,1H,2H,2H-perfluorodecyltriethoxysilane water–alcohol solution containing AgNO3 for 3 h. Subsequently, a "one-step method" is used to prepare low-adhesion superhydrophobic surfaces containing AgNPs. As immersion progresses, more AgNPs are deposited onto the surface. Compared with the polished surface, the samples prepared via the "one-step method" show significant antibacterial properties against both gram-negative Escherichia coli and gram-positive Staphylococcus aureus. The antibacterial properties of the surface improve as immersion progresses.

Keywords: antibacterial, laser etching, one-step modification, polydopamine (PDA) processing, silver nanoparticles (AgNPs), superhydrophobic coating

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Publication history

Received: 18 November 2021
Revised: 11 February 2022
Accepted: 25 February 2022
Published: 25 May 2022
Issue date: April 2023

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© The author(s) 2022.

Acknowledgements

The authors gratefully acknowledge the National Natural Science Foundation of China (52175207) and the National Science and Technology Fund Project of China (2020-JCJQ-JJ-378).

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