Bactericidal nanospike surfaces via thermal oxidation of Ti alloy substrates

Terje Sjostrom, Angela Nobbs, Bo Su

Research output: Contribution to journalArticle (Academic Journal)peer-review

33 Citations (Scopus)
363 Downloads (Pure)

Abstract

With the aim to fabricate bio-inspired antibacterial nanotopography surfaces, nanospikes with varying
dimensions were grown on Ti alloy surfaces using a thermal oxidation method. By controlling the
acetone vapour concentration inside the tube furnace, the resulting oxide surface changed from nanocolumn
shapes to nanospikes with approximately 20 nm diameters. The nanospikee growth was demonstrated
to work on 3D Ti alloy bead surfaces, which means translation of the method to implant
surfaces would be possible. Microbiology studies using Escherichia coli. showed that the nanospikes on
the Ti alloy surfaces has potential to reduce bacterial viability. More dead bacteria were present on the
nanospike surfaces compared to a smooth control and a 40% reduction of viability was noted in bacterial
suspensions incubated with a nanospike surface. It was shown that by annealing the Ti alloy surfaces
prior to thermal oxidation, it is possible to grow vertically aligned nanospikes. This could be highly
valuable when designing implant surfaces with antimicrobial properties
Original languageEnglish
Pages (from-to)22-26
Number of pages5
JournalMaterials Letters
Volume167
Early online date29 Dec 2015
DOIs
Publication statusPublished - 15 Mar 2016

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