1
|
Mayen L, Jensen ND, Laurencin D, Marsan O, Bonhomme C, Gervais C, Smith ME, Coelho C, Laurent G, Trebosc J, Gan Z, Chen K, Rey C, Combes C, Soulié J. A soft-chemistry approach to the synthesis of amorphous calcium ortho/pyrophosphate biomaterials of tunable composition. Acta Biomater 2020; 103:333-345. [PMID: 31881314 DOI: 10.1016/j.actbio.2019.12.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 12/15/2019] [Accepted: 12/19/2019] [Indexed: 12/27/2022]
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. STATEMENT OF SIGNIFICANCE: 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.
Collapse
Affiliation(s)
- Laëtitia Mayen
- CIRIMAT, Université de Toulouse, CNRS, INPT-ENSIACET, Toulouse, France
| | - Nicholai D Jensen
- ICGM, CNRS-UM-ENSCM, Université de Montpellier, Montpellier, France; Sorbonne Université, CNRS, LCMCP, Paris, France
| | | | - Olivier Marsan
- CIRIMAT, Université de Toulouse, CNRS, INPT-ENSIACET, Toulouse, France
| | | | | | - Mark E Smith
- Department of Chemistry, Lancaster University, Lancaster, UK
| | | | | | - Julien Trebosc
- Université de Lille, UMR 8181, UCCS: Unit of Catalysis and Chemistry of Solids, Lille, France
| | - Zhehong Gan
- National High Magnetic Field Laboratory, Tallahassee, FL, USA
| | - Kuizhi Chen
- National High Magnetic Field Laboratory, Tallahassee, FL, USA
| | - Christian Rey
- CIRIMAT, Université de Toulouse, CNRS, INPT-ENSIACET, Toulouse, France
| | - Christèle Combes
- CIRIMAT, Université de Toulouse, CNRS, INPT-ENSIACET, Toulouse, France
| | - Jérémy Soulié
- CIRIMAT, Université de Toulouse, CNRS, INPT-ENSIACET, Toulouse, France.
| |
Collapse
|
2
|
Gualtieri AF, Lusvardi G, Pedone A, Di Giuseppe D, Zoboli A, Mucci A, Zambon A, Filaferro M, Vitale G, Benassi M, Avallone R, Pasquali L, Lassinantti Gualtieri M. Structure Model and Toxicity of the Product of Biodissolution of Chrysotile Asbestos in the Lungs. Chem Res Toxicol 2019; 32:2063-2077. [DOI: 10.1021/acs.chemrestox.9b00220] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Alessandro F. Gualtieri
- Department of Chemical and Geological Sciences, The University of Modena and Reggio Emilia, Via G. Campi 103, I-41125 Modena, Italy
| | - Gigliola Lusvardi
- Department of Chemical and Geological Sciences, The University of Modena and Reggio Emilia, Via G. Campi 103, I-41125 Modena, Italy
| | - Alfonso Pedone
- Department of Chemical and Geological Sciences, The University of Modena and Reggio Emilia, Via G. Campi 103, I-41125 Modena, Italy
| | - Dario Di Giuseppe
- Department of Chemical and Geological Sciences, The University of Modena and Reggio Emilia, Via G. Campi 103, I-41125 Modena, Italy
| | - Alessandro Zoboli
- Department of Chemical and Geological Sciences, The University of Modena and Reggio Emilia, Via G. Campi 103, I-41125 Modena, Italy
| | - Adele Mucci
- Department of Chemical and Geological Sciences, The University of Modena and Reggio Emilia, Via G. Campi 103, I-41125 Modena, Italy
| | - Alfonso Zambon
- Department of Chemical and Geological Sciences, The University of Modena and Reggio Emilia, Via G. Campi 103, I-41125 Modena, Italy
| | - Monica Filaferro
- Department of Biomedical, Metabolic, and Neuro-Sciences, The University of Modena and Reggio Emilia, Via G. Campi 287, I-41125 Modena, Italy
| | - Giovanni Vitale
- Department of Life Sciences, The University of Modena and Reggio Emilia, Via G. Campi 103, I-41125 Modena, Italy
| | - Monia Benassi
- Department of Biomedical, Metabolic, and Neuro-Sciences, The University of Modena and Reggio Emilia, Via G. Campi 287, I-41125 Modena, Italy
| | - Rossella Avallone
- Department of Life Sciences, The University of Modena and Reggio Emilia, Via G. Campi 103, I-41125 Modena, Italy
| | - Luca Pasquali
- Department of Engineering “Enzo Ferrari”, The University of Modena and Reggio Emilia, Via P. Vivarelli 10, I-41125 Modena, Italy
| | - Magdalena Lassinantti Gualtieri
- Department of Engineering “Enzo Ferrari”, The University of Modena and Reggio Emilia, Via P. Vivarelli 10, I-41125 Modena, Italy
| |
Collapse
|
3
|
Charpentier T, Okhotnikov K, Novikov AN, Hennet L, Fischer HE, Neuville DR, Florian P. Structure of Strontium Aluminosilicate Glasses from Molecular Dynamics Simulation, Neutron Diffraction, and Nuclear Magnetic Resonance Studies. J Phys Chem B 2018; 122:9567-9583. [PMID: 30222349 DOI: 10.1021/acs.jpcb.8b05721] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structure of strontium glasses with the composition (SiO2)1-2 x(Al2O3) x(SrO) x ( R = [SrO]/[Al2O3] = 1) and (SiO2)1-4 x(Al2O3) x(SrO)3 x ( R = 3) has been explored experimentally over both short- and intermediate-length scales using neutron diffraction, 27Al and 29Si nuclear magnetic resonance, and classical molecular dynamics simulations in model systems containing around 10 000 atoms. We aim at understanding the structural role of aluminum and strontium as a function of the chemical composition of these glasses. The short- and medium-range structure such as aluminum coordination, bond angle distribution, Q( n) distribution, and oxygen speciation have been systematically studied. Two potential forms of the repulsive short-range interactions have been investigated, namely, the Buckingham and Morse forms. The comparison of these forms allows us to derive general trends independent of the particular choice of the potential form. In both cases, it is found that aluminum ions are mainly fourfold coordinated and mix with the silicon network favoring the Al/Si mixing in terms of Al-O-Si linkages. For the R = 1 glass series, despite the full charge compensation ([SrO] = [Al2O3]), a small fraction of fivefold aluminum is observed both experimentally and in MD simulations, whereas the concentration of sixfold aluminum is negligible. MD shows that the fivefold aluminum units AlO5 preferentially adopt a small ring configuration and link to tricoordinated oxygen atoms whose population increases with the aluminum content and are mainly found in OAl3 and OAl2Si configurations. The modeled Sr speciation mainly involves SrO7 and SrO8 polyhedra, giving a range of average Sr2+ coordination numbers between 7 and 8 slightly dependent on the short-range repulsive potential form. A detailed statistical analysis of T-O-T' (T, T' = Al,Si), accounting for the population of the various oxygen speciations, reveals that both potentials predict a nearly identical Al/Si mixing.
Collapse
Affiliation(s)
- Thibault Charpentier
- NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay , 91191 Gif-sur-Yvette Cedex , France
| | - Kirill Okhotnikov
- NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay , 91191 Gif-sur-Yvette Cedex , France
| | | | - Louis Hennet
- CEMHTI UPR3079 CNRS, Univ. Orléans , F-45071 Orléans , France
| | | | - Daniel R Neuville
- IPGP UMR7154 CNRS, Géomatériaux, Paris Sorbonne Cité , 75005 Paris , France
| | - Pierre Florian
- CEMHTI UPR3079 CNRS, Univ. Orléans , F-45071 Orléans , France
| |
Collapse
|
4
|
Bonhomme C, Wang X, Hung I, Gan Z, Gervais C, Sassoye C, Rimsza J, Du J, Smith ME, Hanna JV, Sarda S, Gras P, Combes C, Laurencin D. Pushing the limits of sensitivity and resolution for natural abundance 43Ca NMR using ultra-high magnetic field (35.2 T). Chem Commun (Camb) 2018; 54:9591-9594. [PMID: 30094425 DOI: 10.1039/c8cc05193c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Natural abundance 43Ca solid state NMR experiments are reported for the first time at ultra-high magnetic field (35.2 T) on a series of Ca-(pyro)phosphate and Ca-oxalate materials, which are of biological relevance in relation to biomineralization processes and the formation of pathological calcifications. The significant gain in both sensitivity and resolution at 35.2 T leads to unprecedented insight into the structure of both crystalline and amorphous phases.
Collapse
Affiliation(s)
- Christian Bonhomme
- Sorbonne Université, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, F-75005 Paris, France.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Youngman R. NMR Spectroscopy in Glass Science: A Review of the Elements. MATERIALS 2018; 11:ma11040476. [PMID: 29565328 PMCID: PMC5951322 DOI: 10.3390/ma11040476] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 03/16/2018] [Accepted: 03/20/2018] [Indexed: 01/30/2023]
Abstract
The study of inorganic glass structure is critically important for basic glass science and especially the commercial development of glasses for a variety of technological uses. One of the best means by which to achieve this understanding is through application of solid-state nuclear magnetic resonance (NMR) spectroscopy, which has a long and interesting history. This technique is element specific, but highly complex, and thus, one of the many inquiries made by non-NMR specialists working in glass science is what type of information and which elements can be studied by this method. This review presents a summary of the different elements that are amenable to the study of glasses by NMR spectroscopy and provides examples of the type of atomic level structural information that can be achieved. It serves to inform the non-specialist working in glass science and technology about some of the benefits and challenges involved in the study of inorganic glass structure using modern, readily-available NMR methods.
Collapse
Affiliation(s)
- Randall Youngman
- Science & Technology Division, Corning Incorporated, SP-AR-02-4, Corning, NY 14831, USA.
| |
Collapse
|
6
|
Kanehashi K. Structural roles of calcium in alkaline and alkaline-earth aluminosilicate glasses by solid-state 43Ca, 17O and 27Al NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 84:158-163. [PMID: 28283343 DOI: 10.1016/j.ssnmr.2017.03.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 01/30/2017] [Accepted: 03/02/2017] [Indexed: 06/06/2023]
Abstract
Structural roles of Ca in aluminosilicate glasses have been investigated by solid-state 43Ca, 17O, and 27Al NMR spectroscopy. In 15Al2O3-55SiO2-15CaO-15RO (R=Mg, Ca, Sr, and Na2) (mol%) glass systems wherein half of the alkaline plus alkaline-earth cations charge-compensate (AlO4)‒ tetrahedra and the other half modify the glass network, with decreasing cation field strength (CFS) in the order of Mg2+>Ca2+>Sr2+>Na+, the isotropic chemical shift (δiso) of 43Ca moves to a higher frequency and the quadrupolar coupling constant (PQ) of 43Ca decreases. The change in the δiso of 43Ca is more sensitive to the role of Ca than that in the PQ of 43Ca. The two possible roles (network modifier and charge compensator) of Ca in the glass with R=Ca are not distinguished in the 43Ca 3QMAS and 5QMAS spectra. The 17O 3QMAS results demonstrate that the cation with higher CFS (e.g., Mg2+ in the R=Mg glass and Ca2+ in the R=Na2 glass) dominantly creates non-bridging oxygen, even though there is slight cation mixing. With increasing CFS in the glass, the PQ of both 43Ca and 27Al also increases, indicating that the cation with higher CFS tends to degrade the structural symmetry.
Collapse
Affiliation(s)
- Koji Kanehashi
- Nippon Steel & Sumitomo Metal Corporation, 20-1 Shintomi, Futtsu, Chiba 293-8511, Japan
| |
Collapse
|
7
|
Presti D, Pedone A, Licari D, Barone V. A Modular Implementation for the Simulation of 1D and 2D Solid-State NMR Spectra of Quadrupolar Nuclei in the Virtual Multifrequency Spectrometer-Draw Graphical Interface. J Chem Theory Comput 2017; 13:2215-2229. [PMID: 28402672 DOI: 10.1021/acs.jctc.7b00154] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present the implementation of the solid state (SoS)NMR module for the simulation of several 1D and 2D NMR spectra of all the elements in the periodic table in the virtual multifrequency spectrometer (VMS). This module is fully integrated with the graphical user interface of VMS (VMS-Draw) [Licari et al., J. Comput. Chem. 36, 2015, 321-334], a freeware tool which allows a user-friendly handling of structures and analyses of advanced spectroscopical properties of chemical compounds-from model systems to real-world applications. Besides the numerous modules already available in VMS for the study of electronic, optical, vibrational, vibronic, and EPR properties, here the simulation of NMR spectra is presented with a particular emphasis on those techniques usually employed to investigate solid state systems. The SoSNMR module benefits from its ability to work under both periodic and nonperiodic conditions, such that small molecules/molecular clusters can be treated, as well as extended three-dimensional systems enforcing (or not) translational periodicity. These features allow VMS to simulate spectra resulting from NMR calculations by some popular quantum chemistry codes, namely Gaussian09/16, Castep, and Quantum Espresso. The effectiveness of the SoSNMR module of VMS is examined throughout the manuscript, and applied to simulate 1D static, MAS, and VAS NMR spectra as well as 2D correlation (90°, MAS) and MQMAS spectra of active NMR nuclei embedded in different amorphous and crystalline systems of actual interest in chemistry and material science. Finally, the program is able to simulate the spectra of both the total ensemble of spin-active nuclei present in the system and of subensembles differentiated depending on the chemical environment of the first and second coordination sphere in a very general way applicable to any kind of systems.
Collapse
Affiliation(s)
- Davide Presti
- Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio-Emilia , 103 via G. Campi, I-41125 Modena, Italy
| | - Alfonso Pedone
- Dipartimento di Scienze Chimiche e Geologiche, Università di Modena e Reggio-Emilia , 103 via G. Campi, I-41125 Modena, Italy
| | - Daniele Licari
- Scuola Normale Superiore di Pisa , Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - Vincenzo Barone
- Scuola Normale Superiore di Pisa , Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| |
Collapse
|
8
|
Gervais C, Jones C, Bonhomme C, Laurencin D. Insight into the local environment of magnesium and calcium in low-coordination-number organo-complexes using 25Mg and 43Ca solid-state NMR: a DFT study. Acta Crystallogr C 2017; 73:208-218. [PMID: 28257015 DOI: 10.1107/s205322961601929x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 12/02/2016] [Indexed: 12/13/2022] Open
Abstract
With the increasing number of organocalcium and organomagnesium complexes under development, there is a real need to be able to characterize in detail their local environment in order to fully rationalize their reactivity. For crystalline structures, in cases when diffraction techniques are insufficient, additional local spectroscopies like 25Mg and 43Ca solid-state NMR may provide valuable information to help fully establish the local environment of the metal ions. In this current work, a prospective DFT investigation on crystalline magnesium and calcium complexes involving low-coordination numbers and N-bearing organic ligands was carried out, in which the 25Mg and 43Ca NMR parameters [isotropic chemical shift, chemical shift anisotropy (CSA) and quadrupolar parameters] were calculated for each structure. The analysis of the calculated parameters in relation to the local environment of the metal ions revealed that they are highly sensitive to very small changes in geometry/distances, and hence that they could be used to assist in the refinement of crystal structures. Moreover, such calculations provide a guideline as to how the NMR measurements will need to be performed, revealing that these will be very challenging.
Collapse
Affiliation(s)
- Christel Gervais
- Sorbonne Universités, UPMC - Paris 06, Collège de France, UMR CNRS 7574, Laboratoire de Chimie de la Matière Condensée de Paris, 4 place Jussieu, 75252 Paris Cedex 05, France
| | - Cameron Jones
- School of Chemistry, Monash University, PO Box 23, Victoria 3800, Australia
| | - Christian Bonhomme
- Sorbonne Universités, UPMC - Paris 06, Collège de France, UMR CNRS 7574, Laboratoire de Chimie de la Matière Condensée de Paris, 4 place Jussieu, 75252 Paris Cedex 05, France
| | - Danielle Laurencin
- Institut Charles Gerhardt de Montpellier, UMR5253, CNRS UM ENSCM, CC1701, Pl. E. Bataillon, 34095 Montpellier Cedex 05, France
| |
Collapse
|
9
|
Gras P, Baker A, Combes C, Rey C, Sarda S, Wright AJ, Smith ME, Hanna JV, Gervais C, Laurencin D, Bonhomme C. From crystalline to amorphous calcium pyrophosphates: A solid state Nuclear Magnetic Resonance perspective. Acta Biomater 2016; 31:348-357. [PMID: 26476341 DOI: 10.1016/j.actbio.2015.10.016] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 09/09/2015] [Accepted: 10/12/2015] [Indexed: 12/14/2022]
Abstract
Hydrated calcium pyrophosphates (CPP, Ca2P2O7·nH2O) are a fundamental family of materials among osteoarticular pathologic calcifications. In this contribution, a comprehensive multinuclear NMR (Nuclear Magnetic Resonance) study of four crystalline and two amorphous phases of this family is presented. (1)H, (31)P and (43)Ca MAS (Magic Angle Spinning) NMR spectra were recorded, leading to informative fingerprints characterizing each compound. In particular, different (1)H and (43)Ca solid state NMR signatures were observed for the amorphous phases, depending on the synthetic procedure used. The NMR parameters of the crystalline phases were determined using the GIPAW (Gauge Including Projected Augmented Wave) DFT approach, based on first-principles calculations. In some cases, relaxed structures were found to improve the agreement between experimental and calculated values, demonstrating the importance of proton positions and pyrophosphate local geometry in this particular NMR crystallography approach. Such calculations serve as a basis for the future ab initio modeling of the amorphous CPP phases. STATEMENT OF SIGNIFICANCE The general concept of NMR crystallography is applied to the detailed study of calcium pyrophosphates (CPP), whether hydrated or not, and whether crystalline or amorphous. CPP are a fundamental family of materials among osteoarticular pathologic calcifications. Their prevalence increases with age, impacting on 17.5% of the population after the age of 80. They are frequently involved or associated with acute articular arthritis such as pseudogout. Current treatments are mainly directed at relieving the symptoms of joint inflammation but not at inhibiting CPP formation nor at dissolving these crystals. The combination of advanced NMR techniques, modeling and DFT based calculation of NMR parameters allows new original insights in the detailed structural description of this important class of biomaterials.
Collapse
Affiliation(s)
- Pierre Gras
- CIRIMAT, INPT-CNRS-UPS, Université de Toulouse, ENSIACET, Toulouse, France
| | - Annabelle Baker
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Christèle Combes
- CIRIMAT, INPT-CNRS-UPS, Université de Toulouse, ENSIACET, Toulouse, France
| | - Christian Rey
- CIRIMAT, INPT-CNRS-UPS, Université de Toulouse, ENSIACET, Toulouse, France
| | - Stéphanie Sarda
- CIRIMAT, INPT-CNRS-UPS, Université de Toulouse, Université Paul Sabatier, Toulouse, France
| | - Adrian J Wright
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Mark E Smith
- Vice-Chancellor's Office, University House, Lancaster University, Lancaster LA14YW, UK; Department of Physics, University of Warwick, Coventry CV4 7AL, UK
| | - John V Hanna
- Department of Physics, University of Warwick, Coventry CV4 7AL, UK
| | - Christel Gervais
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, 75005 Paris, France
| | - Danielle Laurencin
- Institut Charles Gerhardt de Montpellier, UMR 5253, CNRS-UM-ENSCM, Université de Montpellier, Montpellier, France
| | - Christian Bonhomme
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, 75005 Paris, France.
| |
Collapse
|
10
|
Cuny J, Xie Y, Pickard CJ, Hassanali AA. Ab Initio Quality NMR Parameters in Solid-State Materials Using a High-Dimensional Neural-Network Representation. J Chem Theory Comput 2016; 12:765-73. [PMID: 26730889 DOI: 10.1021/acs.jctc.5b01006] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nuclear magnetic resonance (NMR) spectroscopy is one of the most powerful experimental tools to probe the local atomic order of a wide range of solid-state compounds. However, due to the complexity of the related spectra, in particular for amorphous materials, their interpretation in terms of structural information is often challenging. These difficulties can be overcome by combining molecular dynamics simulations to generate realistic structural models with an ab initio evaluation of the corresponding chemical shift and quadrupolar coupling tensors. However, due to computational constraints, this approach is limited to relatively small system sizes which, for amorphous materials, prevents an adequate statistical sampling of the distribution of the local environments that is required to quantitatively describe the system. In this work, we present an approach to efficiently and accurately predict the NMR parameters of very large systems. This is achieved by using a high-dimensional neural-network representation of NMR parameters that are calculated using an ab initio formalism. To illustrate the potential of this approach, we applied this neural-network NMR (NN-NMR) method on the (17)O and (29)Si quadrupolar coupling and chemical shift parameters of various crystalline silica polymorphs and silica glasses. This approach is, in principal, general and has the potential to be applied to predict the NMR properties of various materials.
Collapse
Affiliation(s)
- Jérôme Cuny
- Laboratoire de Chimie et Physique Quantiques (LCPQ), Université de Toulouse [UPS] and CNRS , 118 Route de Narbonne, F-31062 Toulouse, France
| | - Yu Xie
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Chris J Pickard
- Department of Materials Science & Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
| | - Ali A Hassanali
- Condensed Matter Physics Section, The Abdus Salaam International Center for Theoretical Physics , Strada Costiera 11, I-34151 Trieste, Trieste, Italy
| |
Collapse
|