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<dc:title xml:lang="fr">Comportement coopératif de systèmes électrochimiques microstructurés lors d'une réaction bistable</dc:title>
<dcterms:alternative xml:lang="en">Cooperative behavior of electrochemical micro-structured systems during a bistable reaction</dcterms:alternative>
<dc:subject xml:lang="fr">Réaction bistable</dc:subject>
<dc:subject xml:lang="fr">Bruit moléculaire</dc:subject>
<dc:subject xml:lang="fr">Phénomènes coopératifs</dc:subject>
<dc:subject xml:lang="en">Bistable reaction</dc:subject>
<dc:subject xml:lang="en">Molecular noise</dc:subject>
<dc:subject xml:lang="en">Cooperative phenomena</dc:subject>
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<tef:elementdEntree autoriteExterne="027798429" autoriteSource="Sudoc">Stabilité</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="035329998" autoriteSource="Sudoc">Cinétique chimique non linéaire</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="030026342" autoriteSource="Sudoc">Microélectrodes</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027225194" autoriteSource="Sudoc">Électrochimie</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les réactions non-linéaires peuvent donner naissance à des phénomènes coopératifs nouveaux dans des systèmes microstructurés en fonction de la taille des éléments actifs et du couplage entre eux. Nous avons étudié la dynamique de l'électrooxydation de CO, une réaction bistable présentant une branche de résistance différentielle négative en forme de S, sur une microélectrode de platine et des réseaux. Au voisinage d'une instabilité spatiale, une amplification du bruit moléculaire a été observée à cause de l'interaction avec la bifurcation spatiale. Le comportement dynamique est fortement affecté par la concentration en acide sulfurique et par la présence d'une faible quantité de chlorures dans la solution. Quand plusieurs microélectrodes sont couplées globalement, des comportements coopératifs nouveaux ont été mis en évidence comme l'émergence d'oscillations cohérentes et la présence d'un régime d'échange dynamique complexe faisant intervenir des processus inter et intra électrodes.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Nonlinear reactions may give rise to new cooperative phenomena when they occur in microstructured systems depending on the size of the active elements and on the coupling between them. We have studied the dynamics of CO electrooxidation, a bistable electrochemical reaction With an S-shaped negative differential resistance on single Pt microelectrode and on their array. For microelectrodes, close to a spatial instability threshold, strong enhancement of the molecular noise was observed due to its interaction With the spatial bifurcation. The dynamic behaviour of the reaction was shown to be strongly affected by the sulfuric acid concentration and by the presence of a small amount of chlorides in solution. When several microelectrodes are globally coupled, the emergence of new cooperative behaviour could be evidenced such as the emergence of coherent oscillations and the presence of a complex dynamic switching regime involving the interplay of inter and intra electrode processes.</dcterms:abstract>
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