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51. First synthesis of uranyl aluminate nanoparticles

Author

Tony Chave, Philippe Moisy, Claude Berthon, Andreas C. Scheinost, Sergey I. Nikitenko, Bénédicte Arab-Chapelet, Sonochimie dans les Fluides Complexes (LSFC), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Département RadioChimie et Procédés (DRCP), 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), Laboratoire de Chimie des Actinides (LCA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Precipitation (chemistry), Aluminate, XAFS, Inorganic chemistry, Nanoparticle, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Uranyl, 01 natural sciences, NMR, 0104 chemical sciences, Inorganic Chemistry, Ammonia, chemistry.chemical_compound, Hydrolysis, chemistry, uranyl, [CHIM]Chemical Sciences, nanoparticles, Physical and Theoretical Chemistry, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

This paper describes, for the first time, a simple method for the synthesis of uranyl aluminate (URAL) nanoparticles. URAL was prepared by U(VI) hydrolytic precipitation with ammonia at pH = 11 in the presence of mesoporous alumina MSU-X under 20 kHz of sonication followed by annealing of the obtained solids at 800 degrees C. TEM, XAFS, powder XRD, and (27)Al MAS NMR studies revealed that the speciation of uranium in this system strongly depends on uranium concentration. The sample with 5 wt % of uranium yields air-stable nanoparticles ( approximately 5 nm) of URAL. Presumably, UO(2)(2+) cations in this compound are coordinated with bidentate AlO(2)(-) groups. The increase of uranium concentration to 30 wt % causes mostly formation of U(3)O(8) fine particles ( approximately 50 nm) and small amounts of URAL.

Published
2010
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52. Sonochemical disproportionation of carbon monoxide in water: evidence for treanor effect during multibubble cavitation

Author

Tony Chave, Isabelle Billy, Sergey I. Nikitenko, Philippe Martinez, UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Sonochimie dans les Fluides Complexes (LSFC), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Environnements et Paléoenvironnements OCéaniques (EPOC), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Chemistry, 010405 organic chemistry, Inorganic chemistry, Kinetics, Disproportionation, General Chemistry, General Medicine, Photochemistry, 010402 general chemistry, 01 natural sciences, Catalysis, Sonochemistry, 0104 chemical sciences, chemistry.chemical_compound, Cavitation, Kinetic isotope effect, [CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS, Carbon monoxide
Abstract

International audience

Published
2009
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53. Application of the GRAAL model to leaching experiments with SON68 nuclear glass in initially pure water

Author

Tony Chave, Stéphane Gin, Jean-Eric Lartigue, Pierre Frugier, CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Européen des membranes (IEM), Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etudes du Comportement à Long Terme des matériaux de conditionnement (LCLT), Département de recherche sur les Procédés et Matériaux pour les Environnements complexes (DPME), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), and Département de recherche sur les technologies pour l'enrichissement, le démantèlement et les déchets (DE2D)

Subjects
Convection, Nuclear and High Energy Physics, Aqueous solution, Chemistry, Mineralogy, Thermodynamics, 02 engineering and technology, 010502 geochemistry & geophysics, 021001 nanoscience & nanotechnology, 01 natural sciences, Code coupling, Nuclear Energy and Engineering, [CHIM]Chemical Sciences, General Materials Science, Leaching (metallurgy), 0210 nano-technology, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences
Abstract

Based on a review of the current state of knowledge concerning the aqueous alteration of SON68 nuclear glass we have proposed a mechanistic model, GRAAL (Glass Reactivity with Allowance for the Alteration Layer) [P. Frugier, S. Gin, Y. Minet, T. Chave, B. Bonin, N. Godon, J.E. Lartigue, P. Jollivet, A. Ayral, L. De Windt, G. Santarini, J. Nucl. Mater. 380 (2008) 8]. This article describes how the GRAAL model hypotheses are solved using a calculation code coupling chemistry and transport. The geochemical solution of this model combines three major phenomena: chemical equilibria in solution, water and ion transport by convection or diffusion, and element diffusion through the passivating reactive interphase. The model results are compared with experimental data for SON68 glass leached in initially pure water both in a closed system and in renewed media. The comparison shows the model very satisfactorily accounts for variations in the pH and the element concentrations in solution as a function of time, the glass surface area in contact with solution, and the solution renewal rate. This success is due to the fact that the diffusion of elements through the alteration gel is taken into account in the model. This mechanism cannot be disregarded under most experimental conditions — if only to predict the solution pH — and must therefore be an integral part of the geochemical model.

Published
2009
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54. Sonochemical reactions with mesoporous alumina

Author

Dominique Granier, Tony Chave, Thomas Zemb, Sergei I. Nikitenko, Sonochimie dans les Fluides Complexes (LSFC), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Tri ionique par les Systèmes Moléculaires auto-assemblés (LTSM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Boehmite, Materials science, Acoustics and Ultrasonics, Sonication, Mineralogy, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Sonochemistry, Inorganic Chemistry, chemistry.chemical_compound, Chemical Engineering (miscellaneous), Environmental Chemistry, [CHIM]Chemical Sciences, Radiology, Nuclear Medicine and imaging, Dissolution, ComputingMilieux_MISCELLANEOUS, Aqueous solution, Organic Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, Chemical engineering, Aluminium oxide, Nanorod, 0210 nano-technology, Mesoporous material
Abstract

Herein, we report the sonochemical reactions with MSU-X mesoporous alumina (m-Al 2 O 3 ) in aqueous solutions. Sonication ( f = 20 kHz, I = 30 W cm −2 , W aq = 0.67 W mL −1 , T = 36–38 °C, Ar) causes significant acceleration of m-Al 2 O 3 dissolution in the pH range of 4–11. Moreover, power ultrasound has a dramatic effect on the textural properties and phase composition of m-Al 2 O 3 . Short-time sonication at pH = 4 leads to the formation of nanorods and nanofibers of boehmite, AlO(OH). Prolonged ultrasonic treatment causes high aspect morphology transformation to aggregated nanosheets in weakly acid solutions or plated nanocrystals in alkaline solutions. Sonochemical products in alkaline medium are composed principally from boehmite and small amounts of bayerite, Al(OH) 3 . Silent hydrolysis of m-Al 2 O 3 yields boehmite at pH = 4 and bayerite at pH = 11. The effect of ultrasound on the textural properties of mesoporous alumina as well as on the transformation of nanosized bayerite to boehmite can be consistently attributed to the transient strong heating of the liquid shell surrounding the cavitation bubble which caused the chemical processes similar to those occurred during hydrothermal treatment.

Published
2009
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55. Case report: Exposed midfoot fracture due to traffic accident in HIV/AIDS patient

Author

Freddy J. Fernández-Villacorta, Luis Sebastián-Castillo, Shakira Serrano- Díaz, Cristhian Solórzano-Rojas, Jorge Tandaypan-Agreda, Jorge Tantachuco- Ruiz, Patrick Tolentino-Gonzalez, Tony Chávez-Uceda, and Esmeralda Torres-Soto

Subjects
exposed fracture, traffic accident, hiv/aids, Medicine, Medicine (General), R5-920
Abstract

Currently there is a high incidence of traffic accidents in the world, many of them cause severe disability in people. These limb injuries cause high morbidity even reaching an amputation. This is aggravated in HIV/AIDS patients, especially in treatment and evolution. A clinical case of a patient with severe midfoot injury that ends in amputation is presented and a surgical management review of the trauma patient with HIV/AIDS is made.

Published
2020
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56. Producción científica de la facultad de medicina de una universidad peruana en SCOPUS y Pubmed

Author

Jaime Gonzales-Saldaña, Tony Chavez-Uceda, Kevin Lemus-Arteaga, Isabel Silva-Ocas, Tomas Galvez-Olortegui, and Jose Galvez-Olortegui

Subjects
Education (General), L7-991, Medicine (General), R5-920
Abstract

Resumen: Introducción y objetivos: La producción científica de las instituciones académicas constituye una medida relevante de su calidad. El objetivo del presente estudio fue analizar la producción científica de la Facultad de Medicina de la Universidad Nacional de Trujillo en las bases de datos MEDLINE/PubMed y SCOPUS hasta junio de 2016. Material y métodos: Se realizó un estudio bibliométrico en las bases de datos MEDLINE/PubMed y SCOPUS, recuperándose los artículos publicados hasta junio de 2016 que consignaron al menos un autor con la filiación «Facultad de Medicina de la Universidad Nacional de Trujillo» o alguna institución perteneciente a la misma. Se extrajeron los siguientes datos: tipo de publicación, título, autor principal, coautores, autor para la correspondencia, filiaciones pertenecientes, año de publicación, idioma, revista y base de datos indexada. Resultados: Se encontraron 54 publicaciones (43 en SCOPUS, 39 en Pubmed y 28 en ambas). Las publicaciones incluyeron 15 reportes de caso, 10 cartas al editor y 29 artículos originales publicados en 21 revistas, 2 de ellas fueron peruanas. El 16,7% (9/43) de las publicaciones fueron realizadas en el idioma inglés. Se registraron un total de 39 autores con filiación «Facultad de Medicina de la Universidad Nacional de Trujillo». Conclusión: La producción científica de la Facultad de Medicina de la Universidad Nacional de Trujillo en MEDLINE/Pubmed y SCOPUS es baja. Es necesaria la implementación de estrategias que fomenten la producción científica involucrando a estudiantes, docentes, autoridades y egresados, así como la instauración de redes de colaboración que complementen las estrategias implementadas por CONCYTEC. Abstract: Introduction and objectives: The study of scientific production from academic institutions is an important indicator of their quality. The aim of this study was to analyse the scientific production of the Faculty of Medicine of the National University of Trujillo using MEDLINE/PubMed and SCOPUS databases up to June 2016. Material and methods: A literature review was performed using MEDLINE/PubMed and SCOPUS databases. An analysis was made of all articles published up to June 2016, with at least one author affiliated to Faculty of Medicine of the National University of Trujillo or its associated institutions. The following data were collected: type of publication, title, main author, co-authors, corresponding author, area of medicine, publication year, language, journal, and database. Results: A total of 54 articles were indexed (43 in SCOPUS, 39 in PubMed, and 28 in both). Publication types included 15 case reports, 10 letters to the editor and 29 original articles. The articles were published in 21 journals, including 2 Peruvian journals, and 16.7% (9/43) of them were written in English. The Faculty of Medicine of the National University of Trujillo affiliation was used by 39 authors. Conclusion: The scientific production of the Faculty of Medicine of the National University of Trujillo indexed in MEDLINE/PubMed and SCOPUS is low. There is a need to establishment collaborative networks and strategies to promote scientific production involving students, teachers, authorities and graduates, and which complement the strategies implemented by CONCYTEC. Palabras clave: Bibliometría, Investigación biomédica, Escuelas médicas, Base de datos, Keywords: Bibliometrics, Biomedical research, Medical Schools, Database

Published
2018
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