Precipitation of hydroxyapatite nanoparticles: Effects of precipitation method on electrophoretic deposition

Wei, M; Ruys, AJ; Milthorpe, BK; Sorrell, CC

Precipitation of hydroxyapatite nanoparticles: Effects of precipitation method on electrophoretic deposition

Wei, M Ruys, AJ Milthorpe, BK

Sorrell, CC

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Publication Type:: Journal Article
Citation:: Journal of Materials Science: Materials in Medicine, 2005, 16 (4), pp. 319 - 324
Issue Date:: 2005-04-01

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Field	Value	Language
dc.contributor.author	Wei, M	en_US
dc.contributor.author	Ruys, AJ	en_US
dc.contributor.author	Milthorpe, BK https://orcid.org/0000-0002-0867-9586	en_US
dc.contributor.author	Sorrell, CC	en_US
dc.date.available	2004-11-17	en_US
dc.date.issued	2005-04-01	en_US
dc.identifier.citation	Journal of Materials Science: Materials in Medicine, 2005, 16 (4), pp. 319 - 324	en_US
dc.identifier.issn	0957-4530	en_US
dc.identifier.uri	http://hdl.handle.net/10453/12816
dc.description.abstract	Electrophoretic deposition is a low-cost, simple, and flexible coating method for producing hydroxyapatite (HA) coatings on metal implants with a broad range of thicknesses, from < 1 μ m to > 500 μ m. As for many other HA coating techniques, densification of electrophoretically deposited coatings involves heating the coated metal to temperatures above 1000°C. Metal substrates tend to react with HA coatings at such temperatures inducing decomposition at temperatures below 1050°C (decomposition for pure HA normally occurs above 1300°C). Therefore, densification of these coatings needs to be conducted at temperatures lower than 1050°C, and this necessitates the use of high-surface-area HA nano-precipitates, rather than commercially available pre-calcined powders, which densify at temperatures typically higher than 1200°C. HA nano-precipitates were prepared by three methods and deposited on metal substrates by electrophoresis: (1) the acid base method, which produced plate-like nano-particles with a 2.5:1 aspect ratio, and severely cracked coatings; (2) the calcium acetate method, which produced needle-like nano-particles with a 10:1 aspect ratio, and slightly cracked coatings; (3) the metathesis method, which produced rounded nano-particles with a 2:1 aspect ratio, and high-quality crack-free coatings. The results suggested that the less equiaxed the nano-particles, the more cracked the coatings obtained by the electrophoretic deposition technique. © 2005 Springer Science + Business Media, Inc.	en_US
dc.relation.ispartof	Journal of Materials Science: Materials in Medicine	en_US
dc.relation.isbasedon	10.1007/s10856-005-0630-0	en_US
dc.subject.classification	Biomedical Engineering	en_US
dc.subject.mesh	Acids	en_US
dc.subject.mesh	Calcium Compounds	en_US
dc.subject.mesh	Durapatite	en_US
dc.subject.mesh	Acetates	en_US
dc.subject.mesh	Coated Materials, Biocompatible	en_US
dc.subject.mesh	Electrophoresis	en_US
dc.subject.mesh	Chemical Precipitation	en_US
dc.subject.mesh	Nanostructures	en_US
dc.title	Precipitation of hydroxyapatite nanoparticles: Effects of precipitation method on electrophoretic deposition	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	16	en_US
utslib.for	0903 Biomedical Engineering	en_US
utslib.for	0912 Materials Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - CHT - Health Technologies
utslib.copyright.status	closed_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	16	en_US

Abstract:

Electrophoretic deposition is a low-cost, simple, and flexible coating method for producing hydroxyapatite (HA) coatings on metal implants with a broad range of thicknesses, from < 1 μ m to > 500 μ m. As for many other HA coating techniques, densification of electrophoretically deposited coatings involves heating the coated metal to temperatures above 1000°C. Metal substrates tend to react with HA coatings at such temperatures inducing decomposition at temperatures below 1050°C (decomposition for pure HA normally occurs above 1300°C). Therefore, densification of these coatings needs to be conducted at temperatures lower than 1050°C, and this necessitates the use of high-surface-area HA nano-precipitates, rather than commercially available pre-calcined powders, which densify at temperatures typically higher than 1200°C. HA nano-precipitates were prepared by three methods and deposited on metal substrates by electrophoresis: (1) the acid base method, which produced plate-like nano-particles with a 2.5:1 aspect ratio, and severely cracked coatings; (2) the calcium acetate method, which produced needle-like nano-particles with a 10:1 aspect ratio, and slightly cracked coatings; (3) the metathesis method, which produced rounded nano-particles with a 2:1 aspect ratio, and high-quality crack-free coatings. The results suggested that the less equiaxed the nano-particles, the more cracked the coatings obtained by the electrophoretic deposition technique. © 2005 Springer Science + Business Media, Inc.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/12816