Surface characterization, electrochemical properties and in vitro testing of hierarchically structured titanium surfaces
Artikel i vetenskaplig tidskrift, 2013

Newly designed implant surfaces with hierarchic structure have been characterized with respect to chemical composition, topography, electrical properties and cell culturing. Three levels of surface roughness are induced starting from a blasted surface with the naturally formed oxide layer. Dissolution of the blasted surface is obtained by chemical treatment in oxalic acid. The surface becomes smoother with multitude of shallow depressions in the walls and bottoms of the blasted structure. The surface oxide layer formed is somewhat thicker than the naturally formed oxide and may contain oxalate. In the final step, part of the oxide layer is dissolved in hydrofluoric acid leading to a high concentration of soluble titanium species. A nanostructured surface is formed by precipitation of titanium oxide at spots on the surface where locally the pH is increased due to hydrogen evolution. The surface roughness is only marginally changed by the chemical treatment while the conductivity of the surface layer is lower for the chemically treated surfaces compared with the blasted reference. The hierarchical structure mimics many natural processes for achieving high shear strength. © 2012 Elsevier Ltd.

C. X-ray diffraction

Hydrogen

High concentration

Surface layers

Electric properties

Hydrogen evolution

Hydrofluoric acid

Surface characterization

Oxalic Acid

A. oxides

Titanium surfaces

Titanium oxides

Oxide layer

Electron microscopy

Surface oxide layer

Implant surface

Chemical compositions

Chemical treatments

Natural process

Organic acids

Nanostructured surface

X ray diffraction

Hierarchical structures

In-vitro

Surface roughness

C. electron microscopy

D. electrical properties

A. nanostructures

Hierarchic structures

Titanium

Författare

I. Mattisson

C. Gretzer

Elisabet Ahlberg

Göteborgs universitet

Materials Research Bulletin

0025-5408 (ISSN)

Vol. 48 2 389-398

Ämneskategorier

Kemi

DOI

10.1016/j.materresbull.2012.10.037

Mer information

Skapat

2017-10-10