Search

Your search keyword '"Solari, Pier Lorenzo"' showing total 215 results
Start Over Author "Solari, Pier Lorenzo" Publication Year Range Last 10 years
215 results on '"Solari, Pier Lorenzo"'

5. The electronic structure of f-element Prussian blue analogs determined by soft X-ray absorption spectroscopy

Author

Dumas, Thomas, Guillaumont, Dominique, Moisy, Philippe, Shuh, David K, Tyliszczak, Tolek, Solari, Pier Lorenzo, and Den Auwer, Christophe

Subjects
Inorganic Chemistry, Chemical Sciences, Physical Chemistry, Organic Chemistry, Chemical sciences, Engineering
Abstract

In molecular solids derived from Prussian blue, intermetallic charge transfer is fostered through a cyano bridge two metal ions. In this study, isostructural trivalent lanthanide and tetravalent actinide Prussian blue analogs' valence orbitals are probed by soft X-ray absorption measurements.

Published
2018

9. How Do Radionuclides Accumulate in Marine Organisms? A Case Study of Europium with Aplysina cavernicola

Author

Maloubier, Melody, Shuh, David K, Minasian, Stefan G, Pacold, Joseph I, Solari, Pier-Lorenzo, Michel, Hervé, Oberhaensli, François R, Bottein, Yasmine, Monfort, Marguerite, Moulin, Christophe, and Auwer, Christophe Den

Subjects
Environmental Sciences, Ecology, Environmental Management, Biological Sciences, Life Below Water, Americium, Aquatic Organisms, Curium, Europium, Radioisotopes
Abstract

In the ocean, complex interactions between natural and anthropogenic radionuclides, seawater, and diverse marine biota provide a unique window through which to examine ecosystem and trophic transfer mechanisms in cases of accidental dissemination. The nature of interaction between radionuclides, the marine environment, and marine species is therefore essential for better understanding transfer mechanisms from the hydrosphere to the biosphere. Although data pertaining to the rate of global transfer are often available, little is known regarding the mechanism of environmental transport and uptake of heavy radionuclides by marine species. Among marine species, sponges are immobile active filter feeders and have been identified as hyperaccumulators of several heavy metals. We have selected the Mediterranean sponge Aplysina cavernicola as a model species for this study. Actinide elements are not the only source of radioactive release in cases of civilian nuclear events; however, their physicochemical transfer mechanisms to marine species remain largely unknown. We have targeted europium(III) as a representative of the trivalent actinides such as americium or curium. To unravel biological uptake mechanisms of europium in A. cavernicola, we have combined radiometric (γ) measurements with spectroscopic (time-resolved laser-induced fluorescence spectroscopy, TRLIFS, and X-ray absorption near-edge structure, XANES) and imaging (transmission electron microscopy, TEM, and scanning transmission X-ray microscopy, STXM) techniques. We have observed that the colloids of NaEu(CO3)2·nH2O formed in seawater are taken up by A. cavernicola with no evidence that lethal dose has been reached in our working conditions. Spectroscopic results suggest that there is no change of speciation during uptake. Finally, TEM and STXM images recorded at different locations across a sponge cross section, together with differential cell separation, indicate the presence of europium particles (around 200 nm) mainly located in the skeleton and toward the outer surface of the sponge.

Published
2016

11. Insight into the Cationic Charge Distribution in U1–y–zPuyAmzO2±xMixed Oxides

Author

Fouquet-Métivier, Pauline, Medyk, Laetitia, Lebreton, Florent, Guéneau, Christine, Hunault, Myrtille O. J. Y., Solari, Pier-Lorenzo, Dardenne, Kathy, Rothe, Jörg, and Martin, Philippe M.

Abstract

Uranium–plutonium mixed oxides, containing few mol % of Am, are currently studied as fuel for Sodium Fast Reactors. The study of the O/M ratio of these fuels is of main interest, as its variation can induce issues for reactor safety. For this purpose, four U1–y–zPuyAmzO2±xsamples (0.235 ≤ y≤ 0.39 and 0.005 ≤ z≤ 0.02) were studied using electron probe microanalysis (EPMA), X-ray powder diffraction (XRD), and X-ray absorption spectroscopy (XAS) experiments. EPMA analyses revealed a homogeneous matrix phase with few U- and Pu-rich agglomerates. A matrix phase of fluorite structure (face-centered cubic), as well as a small contribution of a UO2phase of the same structure, was evidenced for all of the samples by XRD. The O/M ratios of the (U,Pu)O2±xmatrix were calculated based on the obtained lattice parameters. XANES experiments highlighted the simultaneous presence of U5+and Pu3+/Am3+for all of the samples, indicating a charge compensation mechanism even for stoichiometric samples. Based on the EPMA and XRD results, it was evidenced that this coexistence of U4+, U5+, Pu3+, Pu4+, and Am3+was not originating from the U- and Pu-rich agglomerates. It was found to be rather a peculiarity of the U1–y–zPuyAmzO2±xmatrix phase, discussed with the help of thermodynamic calculations performed on the U–Pu–Am–O system.

Published
2024
Full Text
View/download PDF

12. Electrochemical and Spectroscopic Study of Eu(III)/Eu(II) Couple in the 1-Ethyl-3-Methylimidazolium Bis(Trifluromethanesulfonyl)Imide Ionic Liquid

Author

Bengio, David, Dumas, Thomas, Mendes, Eric, Solari, Pier-Lorenzo, Husar, Richard, Schlegel, Michel, Moisy, Philippe, Pellet-Rostaing, Stéphane, Kim, Hojong, editor, Wesstrom, Bradford, editor, Alam, Shafiq, editor, Ouchi, Takanari, editor, Azimi, Gisele, editor, Neelameggham, Neale R., editor, Wang, Shijie, editor, and Guan, Xiaofei, editor

Published
2018
Full Text
View/download PDF

16. Uranium Speciation in a Chalky Soil

Author

Bayle, Simon, primary, Beccia, Maria Rosa, additional, Moulin, Christophe, additional, Solari, Pier Lorenzo, additional, Den Auwer, Christophe, additional, and Crançon, Pierre, additional

Published
2023
Full Text
View/download PDF

17. Investigation of the Plutonium(IV) Interactions with Two Variants of the EF-Hand Ca-Binding Site I of Calmodulin

Author

Daronnat, Loïc, primary, Holfeltz, Vanessa, additional, Boubals, Nathalie, additional, Dumas, Thomas, additional, Guilbaud, Philippe, additional, Martinez, Diego Moreno, additional, Moisy, Philippe, additional, Sauge-Merle, Sandrine, additional, Lemaire, David, additional, Solari, Pier Lorenzo, additional, Berthon, Laurence, additional, and Berthomieu, Catherine, additional

Published
2023
Full Text
View/download PDF

20. Optimized Coordination of Uranyl in Engineered Calmodulin Site 1 Provides a Subnanomolar Affinity for Uranyl and a Strong Uranyl versus Calcium Selectivity

Author

Pardoux, Romain, primary, Sauge-Merle, Sandrine, additional, Bremond, Nicolas, additional, Beccia, Maria Rosa, additional, Lemaire, David, additional, Battesti, Christine, additional, Delangle, Pascale, additional, Solari, Pier Lorenzo, additional, Guilbaud, Philippe, additional, and Berthomieu, Catherine, additional

Published
2022
Full Text
View/download PDF

23. Effect of natural uranium on bone cells

Author

Gritsaenko Tatiana, Hurault Lucile, Pierrefite-Carle Valérie, Santucci-Darmanin Sabine, Pagnotta Sophie, Vidaud Claude, Hagège Agnès, Solari Pier Lorenzo, Creff Gaëlle, Den Auwer Christophe, and Carle Georges F.

Subjects
Microbiology, QR1-502, Physiology, QP1-981, Zoology, QL1-991
Published
2019
Full Text
View/download PDF

25. Accumulation and Speciation of Cobalt in Paracentrotus lividus

Author

Reeves, Benjamin, primary, Beccia, Maria Rosa, additional, Jeanson, Aurélie, additional, Solari, Pier Lorenzo, additional, Siberchicot, Bruno, additional, Berthomieu, Catherine, additional, Marcellin, Didier, additional, Bremond, Nicolas, additional, Kerdikoshvili, Tamar, additional, Michel, Hervé, additional, Passeron Mangialajo, Luisa, additional, Monfort, Marguerite, additional, Moulin, Christophe, additional, and Den Auwer, Christophe, additional

Published
2022
Full Text
View/download PDF

31. Evidence of Supramolecular Origin of Selectivity in Solvent Extraction of Bifunctional Amidophosphonate Extractants with Different Configurations.

Author

Artese, Alexandre, Dourdain, Sandrine, Boubals, Nathalie, Dumas, Thomas, Solari, Pier Lorenzo, Menut, Denis, Berthon, Laurence, Guilbaud, Philippe, and Pellet-Rostaing, Stéphane

Subjects
URANIUM, EXTENDED X-ray absorption fine structure, SOLUBILIZATION, SOLVENT extraction, X-ray scattering, REVERSED micelles, MASS spectrometry
Abstract

Extraction mechanisms of two bifunctional extractants which differ only by the grafting of an alkyl chain between their two functions were investigated at molecular and supramolecular scales to investigate the origin of their very different separation factors toward uranium and zirconium. Investigation of the complex structure with spectroscopic analysis (Fourier Transform Infra-Red (FTIR), ElectroSpray Ionization Mass Spectroscopy (ESI-MS) and Extended X-Ray Absorption Fine Structure (EXAFS)) demonstrated that alkylation does not affect the chelation mechanism of uranium and zirconium. Stoichiometries of complexes remain identical for both extractants: UO2L2(NO3)2 and zirconium polynuclear complexes are formed after extraction into the organic phase. The origin of selectivity was therefore investigated by considering the supramolecular self-assembly of the two bifunctional molecules. Small-Angle X ray and Neutrons Scattering (SAXS and SANS) showed that the highest separation factors between U and Zr are obtained when smaller aggregates are formed. The results of this study therefore suggests that the selectivity is controlled by the supramolecular self-assembly of the two extractant molecules. Thanks to a smaller packing parameter, the non-alkylated molecule forms bigger aggregates analogous to reverse micelles that can extract additional polar species in their polar core through a solubilization effect, thus decreasing the separation factor between uranium and zirconium. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

35. Electrochemical and Spectroscopic Study of EuIII and EuII Coordination in the 1‐Ethyl‐3‐methylimidazolium Bis(trifluoromethylsulfonyl)imide Ionic Liquid

Author

Bengio, David, primary, Dumas, Thomas, additional, Arpigny, Sylvie, additional, Husar, Richard, additional, Mendes, Eric, additional, Solari, Pier Lorenzo, additional, Schlegel, Michel L., additional, Schlegel, Daniel, additional, Pellet‐Rostaing, Stéphane, additional, and Moisy, Philippe, additional

Published
2020
Full Text
View/download PDF

41. Uranium Uptake inParacentrotus lividusSea Urchin, Accumulation and Speciation

Author

Reeves, Benjamin, primary, Beccia, Maria Rosa, additional, Solari, Pier Lorenzo, additional, Smiles, Danil E., additional, Shuh, David K., additional, Berthomieu, Catherine, additional, Marcellin, Didier, additional, Bremond, Nicolas, additional, Mangialajo, Luisa, additional, Pagnotta, Sophie, additional, Monfort, Marguerite, additional, Moulin, Christophe, additional, and Den Auwer, Christophe, additional

Published
2019
Full Text
View/download PDF

42. Interdisciplinary Round-Robin Test on Molecular Spectroscopy of the U(VI) Acetate System

Author

Müller, Katharina, primary, Foerstendorf, Harald, additional, Steudtner, Robin, additional, Tsushima, Satoru, additional, Kumke, Michael U., additional, Lefèvre, Grégory, additional, Rothe, Jörg, additional, Mason, Harris, additional, Szabó, Zoltán, additional, Yang, Ping, additional, Adam, Christian K. R., additional, André, Rémi, additional, Brennenstuhl, Katlen, additional, Chiorescu, Ion, additional, Cho, Herman M., additional, Creff, Gaëlle, additional, Coppin, Frédéric, additional, Dardenne, Kathy, additional, Den Auwer, Christophe, additional, Drobot, Björn, additional, Eidner, Sascha, additional, Hess, Nancy J., additional, Kaden, Peter, additional, Kremleva, Alena, additional, Kretzschmar, Jerome, additional, Krüger, Sven, additional, Platts, James A., additional, Panak, Petra J., additional, Polly, Robert, additional, Powell, Brian A., additional, Rabung, Thomas, additional, Redon, Roland, additional, Reiller, Pascal E., additional, Rösch, Notker, additional, Rossberg, André, additional, Scheinost, Andreas C., additional, Schimmelpfennig, Bernd, additional, Schreckenbach, Georg, additional, Skerencak-Frech, Andrej, additional, Sladkov, Vladimir, additional, Solari, Pier Lorenzo, additional, Wang, Zheming, additional, Washton, Nancy M., additional, and Zhang, Xiaobin, additional

Published
2019
Full Text
View/download PDF

44. Insight of the Metal–Ligand Interaction in f‐Element Complexes by Paramagnetic NMR Spectroscopy

Author

Autillo, Matthieu, primary, Guerin, Laetitia, additional, Dumas, Thomas, additional, Grigoriev, Mikhail S., additional, Fedoseev, Alexandre M., additional, Cammelli, Sebastiano, additional, Solari, Pier Lorenzo, additional, Guillaumont, Dominique, additional, Guilbaud, Philippe, additional, Moisy, Philippe, additional, Bolvin, Hélène, additional, and Berthon, Claude, additional

Published
2019
Full Text
View/download PDF

45. Modeling and Speciation Study of Uranium(VI) and Technetium(VII) with TBP.

Author

Moeyaert, Pauline, Dumas, Thomas, Guillaumont, Dominique, Solari, Pier Lorenzo, Lefebvre, Claire, Thevenet, Alexiane, Sorel, Christian, and Moisy, Philippe

Subjects
TECHNETIUM, URANIUM, FISSION products, NUCLEAR fuels, REACTOR fuel reprocessing, CHEMICAL speciation, SOLVENT extraction, COORDINATION compounds
Abstract

Among the fission products present in the spent nuclear fuel, technetium exhibits a singular behavior in reprocessing operations performed by solvent extraction. Indeed, this strong acid readily dissociates to form the oxo-anion TcO4− that may interfere with uranium(VI), plutonium(IV), and zirconium(IV) in the extraction cycles of the PUREX process. This paper focuses on the uranium-technetium complex with TBP and on its non-radioactive rhenium surrogate. Despite the large set of distribution data available for rhenium and technetium extraction with TBP, the structures of the co-extracted complexes remain largely unknown. However, it is important to understand clearly the extraction mechanism of technetium with TBP in the PUREX process to optimize the separation process and to model its behavior during the extraction steps. Based on distribution data available in the literature, a thermodynamic model was developed for the extraction of technetium with TBP for a large excess of uranium(VI) in organic phase. A good representation of uranium and technetium distribution data was thus obtained when considering the formation of (HTcO4)(TBP)n complexes, as well as mixed UO2(NO3)(TcO4)(HNO3)x(TBP)n, complexes. In the complex UO2(NO3)2(HNO3)x(TBP)n., one pertechnetate anion replaces one nitrate in the uranium coordination sphere. Combination of complementary spectroscopic techniques (FT-IR and X-ray absorption) supported by theoretical calculations (density functional theory) with organic phases containing a large excess of technetium(VII) or rhenium(VII) enabled full characterization of the limit mixed uranium−technetium species and also of mixed uranium-rhenium species. Details on the coordination of the uranium-technetium complex are provided with the help of DFT calculations and XAS measurements. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

46. How Does Iron Storage Protein Ferritin Interact with Plutonium (and Thorium)?

Author

Zurita, Cyril, Tsushima, Satoru, Bresson, Carole, Garcia Cortes, Marta, Solari, Pier Lorenzo, Jeanson, Aurélie, Creff, Gaëlle, and Den Auwer, Christophe

Subjects
FERRITIN, THORIUM, PLUTONIUM, MOLECULAR dynamics, OXIDATION, MOLECULAR structure
Abstract

The impact of the contamination of living organisms by actinide elements has been a constant subject of attention since the 1950s. But to date still little is understood. Ferritin is the major storage and regulation protein of iron in many organisms, it consists of a protein ring and a ferrihydric core at the center. This work sheds light on the interactions of early actinides (Th, Pu) at oxidation state +IV with ferritin and its ability to store those elements at physiological pH compared to Fe. The ferritin–thorium load curve suggests that ThIV saturates the protein (2840 Th atoms per ferritin) in a similar way that Fe does on the protein ring. Complementary spectroscopic techniques (spectrophotometry, infrared spectroscopy, and X‐ray absorption spectroscopy) were combined with molecular dynamics to provide a structural model of the interaction of ThIV and PuIV with ferritin. Comparison of spectroscopic data together with MD calculations suggests that ThIV and PuIV are complexed mainly on the protein ring and not on the ferrihydric core. Indeed from XAS data, there is no evidence of Fe neighbors in the Th and Pu environments. On the other hand, carboxylates from amino acids of the protein ring and a possible additional carbonate anion are shaping the cation coordination spheres. This thorough description from a molecular view point of ThIV and PuIV interaction with ferritin, an essential iron storage protein, is a cornerstone in comprehensive nuclear toxicology. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

47. Experimental Speciation of Plutonium(IV) in Natural Seawater

Author

Dumas, Thomas, Guigue, Mireille, Moisy, Philippe, Colina-Ruiz, Roberto, Mustre de Leon, Jose, Matara-Aho, Minja, Solari, Pier Lorenzo, Monfort, Margueritte, Moulin, Christophe, Beccia, Maria Rosa, den Auwer, Christophe, Den Auwer, christophe, Département de recherche sur les procédés pour la mine et le recyclage du combustible (DMRC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Chimie de Nice (ICN), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Centro de Investigacion y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
body regions, endocrine system, [CHIM.OTHE] Chemical Sciences/Other, digestive, oral, and skin physiology, [CHIM.RADIO] Chemical Sciences/Radiochemistry, [CHIM.OTHE]Chemical Sciences/Other, complex mixtures, [CHIM.RADIO]Chemical Sciences/Radiochemistry
Abstract

International audience; Solubility, migration, and bioavailability of plutonium is lacunar because experimental evidences are missing. We report here on X-ray Absorption Spectroscopy of plutonium in natural seawater. The observed valence state is +IV and its speciation corresponds to PuO2 type colloids. Furthermore, aging of the solution shows a gradient of ordering from hydroxide colloidal species to more crystalline PuO2 colloids.

Published
2018

50. Formation of CeSiO4 from cerium(iii) silicate precursors

Author

Estevenon, Paul, primary, Kaczmarek, Thibault, additional, Vadot, Fabien, additional, Dumas, Thomas, additional, Solari, Pier Lorenzo, additional, Welcomme, Eleonore, additional, Szenknect, Stephanie, additional, Mesbah, Adel, additional, Moisy, Philippe, additional, Poinssot, Christophe, additional, and Dacheux, Nicolas, additional

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results