Nanoscale conversion of chlorapatite into hydroxyapatite using ultrasound irradiation

[Display omitted] •Chlorapatite nanoparticles are precipitated from a HCl solution of phosphate rock.•Sonication allows the topotactic conversion of chlorapatite into hydroxyapatite.•Undersaturated conditions lead to particle size reduction and not to amorphization.•This method provides a fast route...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2016-04, Vol.495, p.187-192
Main Authors: Bouyarmane, Habiba, Gouza, Asmae, Masse, Sylvie, Saoiabi, Sanaa, Saoiabi, Ahmed, Coradin, Thibaud, Laghzizil, Abdelaziz
Format: Article
Language:English
Subjects:
Cavitation
Chemical Sciences
Conversion
Hydroxyapatite
Ion exchangers
Material chemistry
Nanomaterials
Nanoparticles
Nanostructure
Phosphates
Rock
Sonochemistry
Topotactic conversion
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Summary:[Display omitted] •Chlorapatite nanoparticles are precipitated from a HCl solution of phosphate rock.•Sonication allows the topotactic conversion of chlorapatite into hydroxyapatite.•Undersaturated conditions lead to particle size reduction and not to amorphization.•This method provides a fast route to well-defined hydroxyapatite nanocrystals. The ultrasound-assisted conversion of chlorapatite nanoparticles obtained from a natural phosphate rock into hydroxyapatite nanocrystals was achieved within one hour. The process had no significant impact on particle crystallinity but led to a significant decrease of the colloidal size. Similar variations were obtained for hydroxyapatite nanoparticles treated in the same conditions, suggesting that these variations are not due to the compositional modification. Analyses of the solubility properties of the two phases and of the ionic contents of the reaction medium suggest that the undersaturated conditions of the reaction and the cavitation phenomena favor surface exchange and erosion mechanisms over bulk amorphization.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2016.02.014