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Hydroxyapatites: Key Structural Questions and Answers from Dynamic Nuclear Polarization

Abstract : We demonstrate that NMR/DNP (Dynamic Nuclear Polarization) allows an unprecedented description of carbonate substituted hydroxyapatite (CHAp). Key structural questions related to order/disorder and clustering of carbonates are tackled by using distance sensitive DNP experiments using 13 C-13 C recoupling. Such experiments are easily implemented due to unprecedented DNP gain (orders of magnitude). DNP is efficiently mediated by quasi one-dimensional spin diffusion through the hy-droxyl columns present in the CHAp structure (thought as "highways" for spin diffusion). For spherical nanoparti-cles and ∅ < 100 nm, it is numerically shown that spin diffusion allows their study as a whole. Most importantly, we demonstrate also that the DNP study at 100 K leads to data which are comparable to data obtained at room temperature (in terms of spin dynamics and lineshape resolution). Finally, all 2D DNP experiments can be interpreted in terms of domains exhibiting well identified types of substitution: local order and carbonate clustering are clearly favored.
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César Leroy, Fabien Aussenac, Laure Bonhomme-Coury, Akiyoshi Osaka, Satoshi Hayakawa, et al.. Hydroxyapatites: Key Structural Questions and Answers from Dynamic Nuclear Polarization. Analytical Chemistry, American Chemical Society, 2017, 89 (19), pp.10201 - 10207. ⟨10.1021/acs.analchem.7b01332⟩. ⟨hal-01611666⟩

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