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Critical ageing of hydroxyapatite sol–gel solutions

Paper ID Volume ID Publish Year Pages File Format Full-Text
13905 941 1998 6 PDF Available
Critical ageing of hydroxyapatite sol–gel solutions

It has been established that hydroxyapatite coatings can be produced using an alkoxide based sol–gel technique. Previous work showed that in addition to hydroxyapatite other phases including CaO were observed. A critical factor in determining the composition of the final coating is the period between solution preparation and coating deposition. The current study addresses how the ageing time affects the composition of the coating and the time required before a solution can be used to deposit monophasic coatings.Powders and coatings were produced with ageing times up to one week and examined with X-ray diffraction, thermal gravimetric analysis and differential thermal analysis. By depositing coatings after various ageing times, it was found that a solution ageing time of at least 1 day was required before monophasic hydroxyapatite coatings could be deposited. Thermogravimetric analysis showed that heating of the gel in air or in nitrogen both produced hydroxyapatite. Thermogravimetric analysis could be used as a simple and effective tool for identifying the critical ageing time required to produce high-purity hydroxyapatite coatings.

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Critical ageing of hydroxyapatite sol–gel solutions
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 19, Issue 24, December 1998, Pages 2291-2296
Physical Sciences and Engineering Chemical Engineering Bioengineering