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<dc:title xml:lang="fr">Analyses in situ et approche paramétrique du procédé Spray Flash Evaporation pour l’élaboration d’hexolites</dc:title>
<dcterms:alternative xml:lang="en">In-situ analyses and parametric approach to the Spray Flash Evaporation process for the development of hexolites</dcterms:alternative>
<dc:subject xml:lang="fr">Spray Flash Evaporation (SFE)</dc:subject>
<dc:subject xml:lang="fr">Hexolite</dc:subject>
<dc:subject xml:lang="fr">RDX</dc:subject>
<dc:subject xml:lang="fr">TNT</dc:subject>
<dc:subject xml:lang="fr">Nanodiamants</dc:subject>
<dc:subject xml:lang="fr">Analyse de Particules par Phase Doppler (PDPA)</dc:subject>
<dc:subject xml:lang="fr">Ombroscopie</dc:subject>
<dc:subject xml:lang="fr">Submicrométrique</dc:subject>
<dc:subject xml:lang="en">Spray Flash Evaporation (SFE)</dc:subject>
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<dc:subject xml:lang="en">Nanodiamonds</dc:subject>
<dc:subject xml:lang="en">Phase Doppler Particle Analysis (PDPA)</dc:subject>
<dc:subject xml:lang="en">Ombroscopy</dc:subject>
<dc:subject xml:lang="en">Submicrometric</dc:subject>
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<tef:elementdEntree autoriteExterne="276759346" autoriteSource="Sudoc">Nanocristaux de diamant</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les nanodiamants (NDs) font l'objet de recherches intenses dans les domaines biomédical, militaire et de la mécanique quantique. Pour produire ces NDs, le recours à la détonation d'un mélange RDX/TNT, aussi appelé hexolite, est souvent préféré. Cependant, pour produire des NDs aux propriétés physico-chimiques performantes, il est nécessaire d’avoir au préalable des particules fines d’hexolites, et des mélanges intimes et homogènes. Pour parvenir à cela, le laboratoire NS3E a développé le procédé de recristallisation par évaporation flash de spray (Spray Flash Evaporation, SFE). Cependant, l'influence des différentes conditions opératoires du procédé sur les caractéristiques physico-chimiques des particules est encore mal comprise. Améliorer cette compréhension permettrait une plus grande maîtrise des propriétés des particules recristallisées. Cette thèse vise donc, à l'aide d'analyses in situ telles que l'ombroscopie et le PDPA (Phase Doppler Particle Analyzer), à apporter des réponses. Les recherches se structurent en deux axes principaux. Le premier axe explore en profondeur les phénomènes physico-chimiques de l'évaporation flash d'un solvant (acétone) et l'impact du soluté (hexolite) sur le comportement du spray d'acétone. Le second axe porte quant à lui sur la caractérisation des particules d'hexolite, notamment en ce qui concerne leur sensibilité, leur taille et leur morphologie et les raisons qui ont conduit à de telles propriétés par rapport au comportement du spray.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Nanodiamonds (NDs) are the subject of extensive research in biomedical, military, and quantum mechanics applications. To produce these NDs, the detonation of a RDX/TNT mixture, commonly referred to as hexolite, is frequently employed. However, to achieve NDs with high-performing physicochemical properties, it is essential to begin with finely divided hexolite particles and to ensure that the mixture is both intimate and homogeneous. In pursuit of this goal, the NS3E laboratory has developed a recrystallization process based on Spray Flash Evaporation (SFE). Despite this advancement, the influence of various operating conditions on the physicochemical characteristics of the resulting particles remains poorly understood. Gaining a deeper understanding of these influences would enable more precise control over the properties of the recrystallized particles. This thesis therefore aims to address these issues by employing in situ analytical techniques, such as shadowgraphy and Phase Doppler Particle Analysis (PDPA).The research is organized around two principal axes. The first focuses on an in-depth investigation of the physicochemical phenomena underlying the flash evaporation of a solvent (acetone) and examines how the presence of a solute (hexolite) affects the behavior of the acetone spray. The second axis centers on characterizing the resulting hexolite particles—specifically their sensitivity, size, and morphology—and elucidating the underlying reasons for these properties considering the spray’s behavior.</dcterms:abstract>
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