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Description:

We have developed the titanium oxynitride (TiON) layer which exhibits antibacterial activity against
Escherichia coli without sunlight irradiation. This TiON layer with the segmented structure was formed on a pre-oxidized Ti substrate by the electron beam physical vapor deposition method while spraying the substrate and Ti target with N2-0.1%O2 gas. An XRD pattern of the surface of the segmented layer revealed that the layer has a rock salt structure, which is preferentially deposited in a [111] direction to the substrate surface. TEM observation of the TiON layer showed that the columnar segments have a feather-like structure. The width of the segments near the surface was 100–500nm, and their outermost surfaces were covered with nanometer-sized
spines of 10–50nm width. The TiON layer contained about 20 at% nitrogen as determined by XPS, and the surface was slightly negatively charged with a zeta potential of ¹0.9mV at pH 7.2. The maximum average pressure in the elastic deformation region for the layer was over 100 MPa, which was much higher than the average occlusal pressure (<10 MPa). It is concluded that the segmental structure of the film facilitates the elastic deformation without distorting of the unique surface structure in response to external stress.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Segmented TiON layer, Spinform, Electron beam physical vapor deposition, Antibacterial property, Nanoindentation

Date published: 2024-12-01

Publisher: Ceramic Society of Japan

Journal:

• Journal of the Ceramic Society of Japan (ISSN: 13486535) vol. 132 issue. 12 24090

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2109/jcersj2.24090

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Updated at: 2024-12-27 16:30:52 +0900

Published on MDR: 2024-12-27 16:30:52 +0900