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Microstructural characterisation and antibacterial properties of Ti-Cu alloys
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Materials in Medicine)ORCID iD: 0000-0001-6057-7571
2019 (English)In: Metals in Medicine: F7:Surface modification, traditional and new alloys, permanent and resorbable metals, Stockholm, 2019Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Introduction/Purpose

Ti-Cu alloys are promising alloys for biomedical application in dentistry. Previously, metal ions (Ag+ and Zn+) have been widely used as antibacterial agents, however these ions have been found to be toxic to the human body [1]. Copper has been preferred as a good antibacterial agent due to its low toxicity and high cytocompatibility. The current study is aimed at producing biocompatible Ti-Cu alloys with good mechanical properties, corrosion resistance and antibacterial properties.

Methods

Several TiCu alloys were synthesized with the following composition: Cp-Ti, Ti-0.88wt.%Cu, Ti-2.44wt.%Cu, Ti-3.24wt.%Cu and Ti-10wt.%Cu. The alloys were then exposed to staphylococcus epidermidis bacteria. Then they were characterized using the scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), scanning transmission electron microscopy (STEM), focused ion beam SEM (FIBSEM) and transmission Kikuchi diffraction (TKD) technique.

Results

Figure 1(c) and (f) are the typical SEM micrographs of Ti-3.24wt.%Cu showing the regions of low and high bacteria on the surface of the alloy. FIBSEM samples were cut from the low and high bacteria regions for the TEM and the TKD analysis. A typical bright field STEM image (Fig1(b)) of the lower bacteria region revealed that there were Cu particles (bright) and the Ti phase (grey). The Cu particles seem to sit on the surface area of the lower bacteria region. The TKD confirmed the presence of alpha Ti phase and copper (Fig1a). Figure 1 (e) is a typical bright field STEM image of high bacteria region showing a continuous Cu layer (bright) and a Ti phase. The TKD revealed the presence of Ti alpha phase and Ti2Cu phase.

Conclusions

Compared to CP-Ti (not included here), SEM results on Ti-Cu alloys show that Cu does have antibacterial properties and Ti2Cu phase has been observed only on the high bacteria region of the Ti-3.24wt.%Cu alloy.

Place, publisher, year, edition, pages
Stockholm, 2019.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-400629OAI: oai:DiVA.org:uu-400629DiVA, id: diva2:1381980
Conference
European congress and exhibition on advanced materials and processes (EUROMAT), Stockholm, September 1-5, 2019.
Available from: 2019-12-30 Created: 2019-12-30 Last updated: 2020-01-23Bibliographically approved

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