Organically modified porous hydroxyapatites: A comparison between alkylphosphonate grafting and citrate chelation

Journal Article · Tue Apr 15 04:00:00 UTC 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.01.030· OSTI ID:21128256

El-Hammari, L; Marroun, H; Laghzizil, A; Saoiabi, A ^[1]; Roux, C; Livage, J ^[2]; Coradin, T ^[2]

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1. Laboratoire de Chimie physique Generale, Faculte des Sciences, B.P. 1014, Rabat (Morocco)
2. UPMC Univ Paris 06, UMR 7574, Chimie de la Matiere Condensee de Paris, F-75005 Paris (France)

Two alternative methods to prepare organically modified porous hydroxyapatites following a 'one pot' approach were compared. The partial substitution of inorganic phosphates by alkylphosphonates leads to mesoporous materials with high specific surface area (>200 m{sup 2} g{sup -1}). The incorporation of the organic moieties within the hydroxyapatite structure is confirmed by Infra-red and solid-state NMR spectroscopy and depends on the nature of the alkyl chain. However, it induces a significant loss of the material crystallinity. In contrast, the introduction of citrate, a calcium-chelating agent, to the precursor solution does not improve the material specific surface area but allows a better control of the hydroxyapatite structure, both in terms of crystallinity and pore size distribution. - Graphical abstract: Evolution of pore size distribution of hydroxyapatite (HAp) after alkylphosphonate grafting (20% TPOH) or citrate addition (c-HAp) demonstrates the formation of organically modified mesoporous materials.

• OSTI ID: 21128256
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 4 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
APATITES
CALCIUM COMPOUNDS
CHELATES
CHELATING AGENTS
CITRATES
COMPARATIVE EVALUATIONS
NUCLEAR MAGNETIC RESONANCE
PHOSPHATES
PHOSPHONATES
POROUS MATERIALS
SPECIFIC SURFACE AREA
SPECTROSCOPY