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Hydroxyapatites: Key Structural Questions and Answers from Dynamic Nuclear Polarization. | LitMetric

Hydroxyapatites: Key Structural Questions and Answers from Dynamic Nuclear Polarization.

Anal Chem

Sorbonne Universités, UPMC Université Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP) UMR 7574, 4 Place Jussieu, 75252 Paris Cedex 05, France.

Published: October 2017

AI Article Synopsis

Article 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 using distance sensitive DNP experiments using C-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 hydroxyl columns present in the CHAp structure (thought of as "highways" for spin diffusion). For spherical nanoparticles and ϕ < 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 line shape 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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Source
http://dx.doi.org/10.1021/acs.analchem.7b01332DOI Listing

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