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Nanoparticles in β-tricalcium phosphate substrate enhance modulation of structure and composition of octacalcium phosphate grown layer

Abstract

A c-axis oriented octacalcium phosphate (Ca8(HPO4)2(PO4)4·5H2O; OCP) layer was fabricated on compression-molded substrate of β-tricalcium phosphate (β-Ca3(PO4)2; β-TCP) particles immersed in calcium phosphate solution (weak acidic to basic pH; body temperature). Transmission electron microscopy showed that OCP grew directly on β-TCP when the substrate consisted of microcrystals. Structure and chemical composition (calcium/phosphate molar ratio) of OCP was modulated by interplanar distance shrinkage of (100) plane, d(100), during the initial growth stages. While the d(100) soon recovered to an ideal value with growth, the modulation of chemical composition recovered over a long period. The d(100) shrinkage is attributed to the lack of an HPO4–H2O layer in the OCP structure. When the substrate consisted of nanoparticles, hydroxyapatite (Ca10(PO4)6(OH)2; HAP) crystals first grew on the substrate, and then OCP crystals overgrew them. The structure and chemical composition of OCP showed modulation similar to that of the microcrystal substrate during the initial stages. Slight elongation of d(100) was inversely observed during the later stages, and recovery of composition modulation took longer than with the microcrystal substrate. Nanoparticles in the β-TCP substrate evidently enhances the structure and chemical composition modulations in OCP.

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Publication details

The article was received on 28 Aug 2017, accepted on 13 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7CE01563A
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Nanoparticles in β-tricalcium phosphate substrate enhance modulation of structure and composition of octacalcium phosphate grown layer

    K. Onuma and M. Iijima, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01563A

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