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<dc:subject xml:lang="fr">Moteurs moléculaires</dc:subject>
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<dc:subject xml:lang="fr">Synthèse organique</dc:subject>
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<dc:subject xml:lang="fr">Rhéologie</dc:subject>
<dc:subject xml:lang="fr">Diffusion de neutrons aux petits angles</dc:subject>
<dc:subject xml:lang="en">Molecular motors</dc:subject>
<dc:subject xml:lang="en">Out-of-equilibrium systems</dc:subject>
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<dc:subject xml:lang="en">Light energy conversion</dc:subject>
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<dcterms:abstract xml:lang="fr">Ce manuscrit décrit la synthèse d’un moteur moléculaire rotatif photoactivable. Il est montré que la molécule cible peut être intégrée dans un réseau de chaînes PEG, et que l’irradiation UV du matériau obtenu mène à sa contraction à macroscopique. Ces mouvements moléculaires collectifs permettent donc de convertir de l’énergie lumineuse pour produire un travail mécanique de huit ordres de grandeur au-delà de leur échelle. Une combinaison d’études de rhéologie et de diffusion de neutron a permis de définir les paramètres de formation de gels pour obtenir une contraction maximale, mais aussi l’observation expérimentale que la rotation des moteurs initie des enroulements de chaînes PEG, ce qui est responsable de la contraction du matériau. De plus, la synthèse d’une unité modulatrice et son intégration dans ces matériaux sont décrites. Les gels résultants présentent des propriétés de contraction réversibles et le caractère hors-équilibre de l’ensemble du système est ensuite discuté.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This manuscript describes the gram-scale synthesis of a light-driven rotary molecular motor. It is shown that the target molecule can be integrated into a PEG chains network, and that the UV irradiation of the obtained material leads to its macroscopic contraction. These collective molecular movements are then able to convert light energy to produce a mechanical work of eight orders of magnitude beyond their scale. A combination of rheology and small angle neutron scattering studies defined the of gel formation parameters to obtain maximum contraction, but also the experimental observation that motor rotation initiates PEG chain windings, which is responsible of the contraction of the material.In addition, the synthesis of a modulator unit and its integration into these materials is described. The resulting gels present reversible contraction properties and the out-of-equilibrium behavior of the entire system is then discussed.</dcterms:abstract>
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