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Peroxide-doped apatites: Preparation and effect of synthesis parameters

Abstract : This contribution focused on the preparation of peroxide-doped calciumphosphate apatites--in viewof potential uses as bioactive bioceramics with antimicrobial functions, and on their main physico-chemical characteristics. Two synthesis routeswere investigated. First, the hydrolysis of β-TCP in the presence ofH2O2 was followed. However, only elevated concentrations inH2O2 in themediumor temperatures around 150 °C allowed us to reach the complete β-TCP-to-apatite hydrolysis process, and the obtained samples exhibited a high crystallinity state with no non-apatitic chemical environments. The second protocol tested consisted in the direct apatite precipitation in the presence of H2O2 in themedium (at room temperature). This protocol led to single-phased nanocrystalline apatites, and our data indicate that part of the apatitic OH− ions were substituted by oxygenated species, and typically by peroxide ions (quantified). Physico-chemical modifications in the form of an improvement in crystallinity state, an increase in unit cell volume, and the presence of additional Raman bands were noticed and discussed.
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Submitted on : Friday, October 10, 2014 - 3:31:17 PM
Last modification on : Tuesday, October 20, 2020 - 10:17:21 AM
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Nicolas Vandecandelaere, Françoise Bosc, Christian Rey, Christophe Drouet. Peroxide-doped apatites: Preparation and effect of synthesis parameters. Powder Technology, Elsevier, 2014, vol. 255, pp. 3-9. ⟨10.1016/j.powtec.2013.09.015⟩. ⟨hal-01073854⟩



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