Solid-phase steam-assisted synthesis of hydroxyapatite nanorods and nanoparticles
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Abstract
This article reports a novel and facile solid-based steam-assisted conversion method for the synthesis of hydroxyapatite (HAP, Ca10(PO4)6(OH)2) nanorods and nanoparticles. After steam treatment at 180 °C for 20 h, the wet solid of brushite (CaHPO4·2H2O), which was precipitated from reaction between calcium nitrate [Ca(NO3)2] and diammonium hydrogen phosphate [(NH4)2HPO4], was transformed to HAP nanorods with dimension of 100–300 nm in length and 56 ± 10 nm in diameter through a solid–gas reaction. By the same steam treatment, the dried brushite was converted to nanoparticles of HAP with small aspect ratio and particle size of 70 ± 18 nm. As compared with commercial HAP material, the nanostructured HAP materials exhibited superior sinterability in terms of density and hardness as well as excellent thermal stability. This simple, organic-free and cost-effective synthesis route with low reactant volume offers high potential for large-scale production of nanostructured HAP.
Keywords
Steam Treatment Diammonium Hydrogen Phosphate Excellent Sinterability Brushite PhaseNotes
Acknowledgement
This work was supported by the Science and Engineering Research Council of A*STAR (Agency for Science, Technology and Research), Singapore.
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