Journal article

Electrophoretic deposition of functionalized polystyrene particles for TiO₂ multi-scale structured surfaces

  • Radice, S. EMPA, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Mechanics of Materials and Nanostructures, Thun, Switzerland
  • Dietsch, Hervé Adolphe Merkle Institute and Fribourg Center for Nanomaterials, University of Fribourg, Switzerland
  • Mischler, S. Ecole Polytechnique Fédérale de Lausanne (EPFL), Lab. for Metallurgical, Lausanne, Switzerland
  • Michler, J. EMPA, Swiss Federal Laboratories for Materials Testing and Research, Laboratory for Mechanics of Materials and Nanostructures, Thun, Switzerland
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    10.11.2009
Published in:
  • Surface and Coatings Technology. - 2010, vol. 204, no. 11, p. 1749-1754
English Titanium is an interesting material for biomedical implants thanks to its physical and chemical properties. In particular, TiO₂ coatings with a surface characterized by micro-patterning combined with nano-topography are extremely attractive for orthopaedic implants in terms of enhanced osteointegration and consequently improved implant fixation. In the present work, a new method for the preparation of TiO₂ multi-scale structured coatings is presented. This method is based on three steps. Firstly, monodispersed polystyrene (PS) microsized beads are functionalized with TiO₂ submicron particles by a wet process involving a cationic polyelectrolyte. Secondly, the resulting TiO₂-PS composite particles in suspension are used to prepare coatings by electrophoretic deposition (EPD), a simple and flexible electrochemical technique. The EPD is performed cathodically, avoiding uncontrolled oxidation of the substrate. Finally, after removal of the PS spacers during the sintering process, TiO₂ coatings with a combined micro- and nano-topography are achieved from deposits thicker than 100 µm. This achievement presents two relevant aspects: potential applications of the multi-scale structured TiO₂ surfaces (particularly in the biomedical field); the simplicity and flexibility of the process used.
Faculty
Faculté des sciences et de médecine
Department
AMI - Soft Nanoscience
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/301654
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