Sonoelectrochemical deposition of calcium phosphate coatings on carbon materials - Effect of electrolyte concentration

H. M. Han, G. J. Phillips, S. V. Mikhalovsky, S. FitzGerald, A. W. Lloyd

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Calcium phosphate was deposited on carbon materials using a sonoelectrochemical method in an electrolyte containing calcium and phosphate ions. The effect of electrolyte concentration on sonoelectrochemically deposited calcium phosphate coatings was investigated and the underlying deposition mechanisms were discussed. The morphology, size and composition of the crystalline deposits changed with the electrolyte concentration. A mixture of plate, sphere and needle-like deposits was obtained at Ca2+ ion concentrations greater than 16 mM, however needle-like hydroxyapatite (HA) was obtained at lower Ca2+ concentrations. Analysis revealed that the sonoelectrochemical deposition of calcium phosphate consists of two processes - nucleation and crystal growth. The results suggest that the homogeneous nucleation of calcium phosphates in solution, followed by their absorption onto the carbon surface may account for the mechanism of coating observed at higher ionic concentrations. At lower concentrations, heterogeneous nucleation occurs on the surface of the carbon fibres, followed by the development of islands of crystal growth. The lower ionic concentration was shown to favour the generation of hydroxyapatite on carbon-based materials.

Original languageEnglish
Pages (from-to)2845-2850
Number of pages6
JournalJournal of Materials Science: Materials in Medicine
Volume19
Issue number8
DOIs
Publication statusPublished - Aug 2008
Externally publishedYes

Fingerprint

Phosphate coatings
Calcium phosphate
Electrolytes
Carbon
Coatings
Nucleation
Durapatite
Crystallization
Hydroxyapatite
Crystal growth
Needles
Deposits
Calcium Phosphates
Ions
Islands
Carbon fibers
Calcium
Phosphates
Crystalline materials
calcium phosphate

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Chemical Engineering(all)

Cite this

Sonoelectrochemical deposition of calcium phosphate coatings on carbon materials - Effect of electrolyte concentration. / Han, H. M.; Phillips, G. J.; Mikhalovsky, S. V.; FitzGerald, S.; Lloyd, A. W.

In: Journal of Materials Science: Materials in Medicine, Vol. 19, No. 8, 08.2008, p. 2845-2850.

Research output: Contribution to journalArticle

Han, H. M. ; Phillips, G. J. ; Mikhalovsky, S. V. ; FitzGerald, S. ; Lloyd, A. W. / Sonoelectrochemical deposition of calcium phosphate coatings on carbon materials - Effect of electrolyte concentration. In: Journal of Materials Science: Materials in Medicine. 2008 ; Vol. 19, No. 8. pp. 2845-2850.
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