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Preparation and physico-chemical characteristics of luminescent apatite-based colloids

Al-Kattan, Ahmed and Dufour, Pascal and Dexpert-Ghys, Jeannette and Drouet, Christophe Preparation and physico-chemical characteristics of luminescent apatite-based colloids. (2010) Journal of Physical Chemistry C, vol. 114 (n° 7). pp. 2918-2924. ISSN 1932-7447

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Official URL: http://dx.doi.org/10.1021/jp910923g

Abstract

Luminescent colloidal nanosystems based on europium-doped biomimetic apatite were prepared and investigated. The colloids were synthesized by soft chemistry in the presence of a phospholipid moiety, 2-aminoethylphosphoric acid (AEP), with varying europium doping rates. Physicochemical features, including compositional, structural, morphological, and luminescence properties, were examined. Experimental evidence showed that suspensions prepared from an initial Eu/(Eu+Ca) molar ratio up to 2% consisted of single-phased biomimetic apatite nanocrystals covered with AEP molecules. The mean particle size was found to depend closely on the AEP content, enabling the production of apatite colloids with a controlled size down to ca. 30 nm. The colloids showed luminescence properties typical of europium-doped systems with narrow emission bands and long luminescence lifetimes of the order to the millisecond, and the data suggested the location of Eu3+ ions in a common crystallographic environment for all the colloids. These systems, stable over time and capable of being excited in close-to-visible or visible light domains, may raise interest in the future in the field of medical imaging.

Item Type:Article
Additional Information:The definitive version is available at http://pubs.acs.org/doi/abs/10.1021/jp910923g
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By: Leila Abdelouhab
Deposited On:13 Apr 2011 16:18

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