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Open AccessArticle

Optimization of Antibacterial Properties of “Hybrid” Metal-Sputtered Superhydrophobic Surfaces

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Institute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos”, Patr. Gregoriou E’ and 27 Neapoleos str., 15341 Aghia Paraskevi, Attiki, Greece
2
Institute of Biosciences and Applications, National Center for Scientific Research “Demokritos”, Patr. Gregoriou E’ and 27 Neapoleos str., 15341 Aghia Paraskevi, Attiki, Greece
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(1), 25; https://doi.org/10.3390/coatings10010025
Received: 14 November 2019 / Revised: 19 December 2019 / Accepted: 22 December 2019 / Published: 30 December 2019
(This article belongs to the Special Issue Anti-Adhesive Surfaces)
Bacterial attachment and colonization to hygiene sensitive surfaces, both public and nosocomial, as well as in food industry areas, poses a serious problem to human healthcare. Several infection incidents are reported, while bacterial resistance to antibiotics is increasing. Recently, novel techniques for the design of antibacterial surfaces to limit bacterial spreading have emerged, including bifunctional antibacterial surfaces with antifouling and bactericidal action. In this context, we have recently developed smart, universal, metal-sputtered superhydrophobic surfaces, demonstrating both bacterial repulsion and killing efficacy. Herein, we present the optimization process that led to the realization of these “hybrid” antibacterial surfaces. To this end, two bactericidal agents, silver and copper, were tested for their efficiency against Gram-negative bacteria, with copper showing a stronger bactericidal action. In addition, between two low surface energy coatings, the fluorinated-alkyl self-assembled chlorosilane layer from perfluorinated octyltrichlorosilane (pFOTS) solution and the fluorocarbon layer from octafluorocyclobutane (C4F8) plasma were both approved for their anti-adhesive properties after immersion in bacterial solution. However, the latter was found to be more efficient when engrafted with the bactericidal agent in shielding its killing performance. Furthermore, the thickness of the plasma-deposited fluorocarbon layer was optimized, in order to simultaneously retain both the superhydrophobicity of the surface and its long-term bactericidal activity. View Full-Text
Keywords: antibacterial activity; hybrid antibacterial surfaces; bifunctional surfaces; bactericidal agents; anti-adhesive surfaces; superhydrophobicity; plasma micro-nanotextured surfaces; Gram-negative bacteria antibacterial activity; hybrid antibacterial surfaces; bifunctional surfaces; bactericidal agents; anti-adhesive surfaces; superhydrophobicity; plasma micro-nanotextured surfaces; Gram-negative bacteria
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MDPI and ACS Style

Kefallinou, D.; Ellinas, K.; Speliotis, T.; Stamatakis, K.; Gogolides, E.; Tserepi, A. Optimization of Antibacterial Properties of “Hybrid” Metal-Sputtered Superhydrophobic Surfaces. Coatings 2020, 10, 25.

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