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Influence of fluorine in the synthesis of apatites. Synthesis of solid solutions of hydroxy-fluorapatite

Paper ID Volume ID Publish Year Pages File Format Full-Text
12774 816 2003 9 PDF Available
Title
Influence of fluorine in the synthesis of apatites. Synthesis of solid solutions of hydroxy-fluorapatite
Abstract

Hydroxy-fluorapatites (OH-FAps) occur biologically in teeth and form the basis for application as biomaterials. This work aims to synthesize a series of fluoride substituted calcium hydroxyapatites (OHAps) to determine how fluoride influences the synthesis and the resulting characteristics of solid solutions. OH-FAPs powders were synthesized with a chemical composition of Ca10(PO4)6(OH)2−x Fx, with x=0.0, 0.4, 0.8, 1.2, 1.6 and 2.0. The synthesis of partially substituted OHAp yields materials with lower crystallinity and higher specific surface area than OHAp or fluorapatite (FAp). The smallest crystal size of 263 Å, occurs at less than 50% hydroxyl substitution with fluoride at x=0.4, and the highest surface area of 132 m2/g occurs at x=0.8. Reaction kinetics occur faster at higher fluoride content, producing the expected Ca/P ratio of 1.67 only for x=2.0. X-ray and IR studies show that OH-FAPs are homogeneous solid solutions instead of mixtures of OHAp and FAp. The presence of a high fluoride concentration increases the driving force for crystal growth during the calcination process.

Keywords
Hydroxy-fluorapatite; Fluorapatite; Solid solutions; Bioceramics; Synthesis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 24, Issue 21, September 2003, Pages 3777–3785
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us