Journal
LASER PHYSICS LETTERS
Volume 18, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1612-202X/abdece
Keywords
laser ablation in liquids; Ti; nanoripples; antibacterial properties; flow-through filter
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Funding
- Russian Science Foundation [18-15-00220]
- Russian Science Foundation [18-15-00220] Funding Source: Russian Science Foundation
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This study reported on the fabrication of antibacterial nanostructures using laser ablation, showing that nanospikes and periodic surface ripples on a Ti surface have strong anti-biofilm effects. The addition of cytotoxic nanoparticles (Ag, Se) further enhanced the bactericidal activities. The antibacterial properties of these nanostructures were demonstrated through live/dead tests, with the combination of chemical toxicity of nanoparticles and mechanical damage from sharp nanoscale relief on Ti being the primary mechanisms.
We report the laser-ablative fabrication of antibacterial nanostructures, combining mechanical and chemotoxic effects, by femto- and nanosecond laser ablation and their testing on Staphylococcus aureus and Pseudomonas aeruginosa strains. A Ti surface, covered with nanospikes and periodical surface ripples, provides a strong anti-biofilm effect, and the addition of cytotoxic nanoparticles (NPs) (Ag, Se) enhances the overall bactericidal activities. A flow reactor, including Ti nanospike-covered wafers as a through-flow sterilizer, allowed reduction of the bacterial population by two orders. Several types of nanostructures with/without biofilms were characterized by scanning electron microscopy and energy-dispersive x-ray spectroscopy. Their antibacterial properties were demonstrated by standard live/dead tests and were suggested to originate from the combined chemical toxicity of NPs and mechanical damage caused by sharp nanoscale relief on Ti.
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