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WorldCat Identities

Virot, Matthieu

Overview
Works: 3 works in 3 publications in 1 language and 4 library holdings
Roles: Author, Opponent
Publication Timeline
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Most widely held works by Matthieu Virot
Soxhlet assisté par micro-ondes : conception et application à l'extraction des matières grasses by Matthieu Virot( Book )

1 edition published in 2009 in French and held by 2 WorldCat member libraries worldwide

De manière générale, la préparation d'échantillon peut être décomposée en deux étapes distinctes : extraction et analyse. Alors que l'étape analytique requiert quelques minutes, l'étape d'extraction nécessite plusieurs heures (ou jours). C'est le cas de la méthode de Soxhlet, inventée en 1879 qui est aujourd'hui la procédure de référence pour l'extraction solide-liquide. Depuis la découverte des effets thermiques des micro-ondes par Spencer en 1946, l'impact des micro-ondes sur la matière a été largement caractérisé et validé par la communauté scientifique. Rapidement, les micro-ondes ont été utilisées pour l'extraction dans le but de contrecarrer les limites des techniques d'extraction conventionnelles. Notre travail a consisté en la conception, l'optimisation et la valorisation d'une technique d'extraction destinée au dosage des matières grasses dans les matrices alimentaires solides : le Soxhlet assisté par micro-ondes. Une première partie du document est consacrée à la compréhension des fondements et considérations théoriques de l'énergie micro-ondes. Une seconde partie du manuscrit rappelle les techniques employées pour la conception et valorisation du Soxhlet assisté par micro-ondes. Enfin, la dernière partie du manuscrit traite des résultats obtenus et s'articule selon trois sections distinctes : dans un premier chapitre, la mise au point, l'optimisation et l'application du nouveau dispositif sont décrites. L'appareillage permet des extractions rapides, non destructrices et généralisables à diverses matrices alimentaires discutées dans un second chapitre. L'approche écologique de l'invention, combinée à l'emploi du d-limomène, comme alternative au n-hexane conventionnel, fait l'objet d'un troisième et dernier chapitre
Festival Temps d'images, 04 > 10 avril : spectacles, performances, projections, rencontres( Visual )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

Synthèse et caractérisation structurale des complexes de plutonium à base de peroxyde by Nicolas Hibert( )

1 edition published in 2020 in French and held by 1 WorldCat member library worldwide

In the framework of the improvement of the reused nuclear fuel manufacturing and the Pu multirecycling, U-Pu coconversion represent a potential alternative to the current mixing process of uranium and plutonium oxide powders. Compared to carbon-based U-Pu coconversion processes, the peroxide process has the advantage of, among others, leading to the absence of residual carbon in oxide powder. However, the current knowledge of plutonium peroxide is incomplete and scattered, hindering the plutonium conversion and U-Pu coconversion technological developments. Thus, the evaluation of the feasibility of this process requires a preliminary strengthening of the knowledge of plutonium peroxide physico-chemical properties. The first part of this work has been dedicated to the characterization of plutonium peroxide soluble complexes and salts. Molar extinction coefficient of soluble complexes have been estimated in order to quantify the plutonium loss in precipitation experiments. The experimental conditions enabling very high yield of precipitation of Pu and an easy-filterable powder have been determined. Moreover, a new database of plutonium peroxide salt properties has been established from the characterizations obtained. In the second part, syntheses carried out with mixed systems such as U-Pu and U-Th have led to obtaining a mix of uranyl peroxide and +IV actinide peroxide salt. The experimental conditions enabling very high yields for uranium and for plutonium and an easy-filterable powder have been determined. Then, thermal treatment of the precipitate has led to obtaining an oxide powder with a good ability to the manufacturing of sintered oxide pellet and which enables to demonstrate the feasibility of U-Pu conversion process at the laboratory scale
 
Audience Level
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Audience Level
 1
  General Special  
Audience level: 0.00 (from 0.00 for Soxhlet as ... to 0.00 for Soxhlet as ...)

Languages
French (3)