Skip to Main content Skip to Navigation
Journal articles

A soft-chemistry approach to the synthesis of amorphous calcium ortho/pyrophosphate biomaterials of tunable composition

Abstract : The development of amorphous phosphate-based materials is of major interest in the field of biomaterials science, and especially for bone substitution applications. In this context, we herein report the synthesis of gel-derived hydrated amorphous calcium/sodium ortho/pyrophosphate materials at ambient temperature and in water. For the first time, such materials have been obtained in a large range of tunable orthophosphate/pyrophosphate molar ratios. Multi-scale characterization was carried out thanks to various techniques, including advanced multinuclear solid state NMR. It allowed the quantification of each ionic/molecular species leading to a general formula for these materials: [(Ca2+y Na+z H+3+x-2y-z)(PO43−)1-x(P2O74−)x](H2O)u. Beyond this formula, the analyses suggest that these amorphous solids are formed by the aggregation of colloids and that surface water and sodium could play a role in the cohesion of the whole material. Although the full comprehension of mechanisms of formation and structure is still to be investigated in detail, the straightforward synthesis of these new amorphous materials opens up many perspectives in the field of materials for bone substitution and regeneration. The metastability of amorphous phosphate-based materials with various chain length often improves their (bio)chemical reactivity. However, the control of the ratio of the different phosphate entities has not been yet described especially for small ions (pyrophosphate/orthophosphate) and using soft chemistry, whereas it opens the way for the tuning of enzyme- and/or pH-driven degradation and biological properties. Our study focuses on elaboration of amorphous gel-derived hydrated calcium/sodium ortho/pyrophosphate solids at 70 °C with a large range of orthophosphate/pyrophosphate ratios. Multi-scale characterization was carried out using various techniques such as advanced multinuclear SSNMR (31P, 23Na, 1H, 43Ca). Analyses suggest that these solids are formed by colloids aggregation and that the location of mobile water and sodium could play a role in the material cohesion.
Document type :
Journal articles
Complete list of metadatas

Cited literature [60 references]  Display  Hide  Download

https://hal.sorbonne-universite.fr/hal-02447805
Contributor : Guillaume Laurent <>
Submitted on : Tuesday, January 21, 2020 - 8:33:00 PM
Last modification on : Wednesday, September 23, 2020 - 11:50:08 AM
Long-term archiving on: : Wednesday, April 22, 2020 - 8:08:30 PM

File

2020_Mayen et al_full.pdf
Files produced by the author(s)

Identifiers

Citation

Laëtitia Mayen, Nicholai Jensen, Danielle Laurencin, Olivier Marsan, Christian Bonhomme, et al.. A soft-chemistry approach to the synthesis of amorphous calcium ortho/pyrophosphate biomaterials of tunable composition. Acta Biomaterialia, Elsevier, 2020, 103, pp.333-345. ⟨10.1016/j.actbio.2019.12.027⟩. ⟨hal-02447805⟩

Share

Metrics

Record views

291

Files downloads

74