Articles | Volume 3, issue 2
https://doi.org/10.5194/mr-3-111-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/mr-3-111-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Insight into the structure of black coatings of ancient Egyptian mummies by advanced electron magnetic resonance of vanadyl complexes
Charles E. Dutoit
Chimie-ParisTech, PSL University, CNRS, Institut de Recherche de
Chimie-Paris (IRCP), 75005 Paris, France
Laurent Binet
Chimie-ParisTech, PSL University, CNRS, Institut de Recherche de
Chimie-Paris (IRCP), 75005 Paris, France
Hervé Vezin
Université de Lille, CNRS, UMR8516-LASIRE, 59000 Lille, France
Océane Anduze
Chimie-ParisTech, PSL University, CNRS, Institut de Recherche de
Chimie-Paris (IRCP), 75005 Paris, France
Agnès Lattuati-Derieux
Centre de Recherche et de Restauration des Musées de France
(C2RMF), Palais du Louvre, 75001 Paris, France
Didier Gourier
CORRESPONDING AUTHOR
Chimie-ParisTech, PSL University, CNRS, Institut de Recherche de
Chimie-Paris (IRCP), 75005 Paris, France
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Charles-Emmanuel Dutoit, Raffaella Soleti, Jean-Marie Doux, Vincent Pelé, Véronique Boireau, Christian Jordy, Simon Pondaven, and Hervé Vezin
Magn. Reson., 6, 113–118, https://doi.org/10.5194/mr-6-113-2025, https://doi.org/10.5194/mr-6-113-2025, 2025
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We have performed a low-frequency electron paramagnetic resonance (EPR) study on two (LiNi0.8Mn0.1Co0.1O2 (NMC)-Li-metal- and NMC-Si-based) solid-state batteries sealed inside an industrial and standard aluminum laminated pouch cell. We observed an EPR spectrum from Li metal, confirming the good penetration of the microwave field through the pouch. We think our approach provides valuable insight for the battery community, paving the way for the quality control of industrial and commercial batteries.
Charles-E. Dutoit, Hania Ahouari, Quentin Denoyelle, Simon Pondaven, and Hervé Vezin
Magn. Reson., 5, 87–93, https://doi.org/10.5194/mr-5-87-2024, https://doi.org/10.5194/mr-5-87-2024, 2024
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In our study, we correlate the first- and the second-harmonic detection modes of continuous-wave electron paramagnetic resonance (EPR) to identify traces of non-dendritic Li metal present on the graphite anode after multiple electrochemical cycles. Such metallic complexes are a source of limitations which reduce battery life and lead to serious safety issues. To improve their detection, we propose to simultaneously record the first- and second-harmonic EPR spectra.
Elise Garel, Laurent Binet, and Didier Gourier
Magn. Reson., 3, 211–220, https://doi.org/10.5194/mr-3-211-2022, https://doi.org/10.5194/mr-3-211-2022, 2022
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Could the gesture of an ancient artist applying a paint layer be reconstructed using EPR analysis? In the case of an inorganic pigment widely used in antiquity, Egyptian blue, where the anisotropy of the Cu2+ EPR signal reflects the symmetry of the pigment crystallites, we have shown that the orientation distribution of the grains, as revealed by simulation of EPR spectra, is indeed influenced by the nature of the gesture.
Benjamin Nicot, Jean-Pierre Korb, Isabelle Jolivet, Hervé Vezin, Didier Gourier, and Anne-Laure Rollet
Magn. Reson., 3, 125–136, https://doi.org/10.5194/mr-3-125-2022, https://doi.org/10.5194/mr-3-125-2022, 2022
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In this article we report a multiscale approach for explaining why the transport of fluids in oil shales is so hindered. Thanks to nuclear and electronic magnetic resonances, we first demonstrate that the kerogen within the shale is capable of swelling in the presence of oil; and second we show that this swelling is reversible and reveals the presence of vanadyl porphyrin by breaking magnetic interaction. The magnetic interactions evidenced helps understand the very low mobility of hydrocarbons.
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Short summary
Egyptian mummies were covered with an enigmatic black organic matter. Its chemical composition is classically determined by molecular analysis methods, which are destructive by nature. In a new analytical approach based on 1H and 14N hyperfine spectroscopy, we use V+ ions, existing at trace level in this black matter, as internal probes for a non-destructive exploration of the material. The results suggest that a common recipe was used for animal and human mummies of different ages.
Egyptian mummies were covered with an enigmatic black organic matter. Its chemical composition...