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Covalent modification of calcium hydroxy and fluoroapatite surface by grafting alkylphosphonate

Published online by Cambridge University Press:  14 November 2013

Hassen Agougui ,
Abdallah Aissa  and
Mongi Debbabi
Hassen Agougui
Affiliation:
Laboratoire de Physico-Chimie des Matériaux, Faculté des Sciences de Monastir, 5019 Monastir, Tunisia
Abdallah Aissa
Affiliation:
Laboratoire de Physico-Chimie des Matériaux, Faculté des Sciences de Monastir, 5019 Monastir, Tunisia
Mongi Debbabi*
Affiliation:
Laboratoire de Physico-Chimie des Matériaux, Faculté des Sciences de Monastir, 5019 Monastir, Tunisia
*
*Corresponding author. Tel. : +216 98 439 692 E-mail: [email protected]
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Abstract

Calcium hydroxyl and fluoroapatite (CaHAp and CaFAp) were prepared in the presence of the 2-carboxyletylphosphonic acid (2-CEPA), by hydrothermal method. The incorporation of phosphonic acid within the apatite structure was confirmed by powder XRD, IR and MAS-NMR spectroscopies and SSA. The X-ray powder analysis showed that the cristallinity was not affected by the presence of organic moieties. IR spectroscopy showed new vibration modes related to phosphonate groups. 31P MAS-NMR spectra exhibit new signals, assigned to the presence of organic phosphorus. Specific surface area (SSA) increases with increasing of phosphonate amount, especially for CaHAp. According to these results, a mechanism is proposed for the formation of two types of ionic interaction (-C-O-Ca) and (Ca-O-Porg).

Keywords

Surface modificationphosphonatehydrothermal method
Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Supplement S2 , September 2013 , pp. S197 - S208
Copyright
Copyright © International Centre for Diffraction Data 2013 

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