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Insertion et organisation de nanoparticules à l'intérieur de bicouches de tensioactifs déposées sur substrats solides

Abstract : The self-assembling properties of surfactant can be used to direct the organization of nanoparticles. During this PhD work, we studied the transfer of freestanding surfactant films onto solid substrates as well as the insertion and organization of nanoparticles within these films. We first proved that the films stabilized by different kinds of surfactant may be transferred onto hydrophobic and atomically flat surfaces, for example hydrogenated silicon or silanized silica. Characterizations (X-Ray reflectivity, AFM) showed that the molecular organization of the freestanding films was kept during transfer. We then investigated the insertion and organization of nanoparticles within the transferred surfactant bilayers. First nanoparticles were deposited individually. The density of nanoparticles on the surface can be controlled by this process. Then, in order to obtain dense and organized monolayers of nanoparticles, we employed the interactions between the surfactant molecules stabilizing the freestanding films and the nano-objects. Thus dense monolayers of gold nanoparticles were deposited onto hydrogenated silicon surfaces, their surface can reach up to dozens of µm². When the freestanding films were given some time to reach equilibrium before deposition, the monolayers become denser. The interactions in the system under study can also be applied to other metallic particles or even particles of metallic oxides.
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Contributor : Gaëlle Andreatta <>
Submitted on : Sunday, February 22, 2009 - 6:47:33 PM
Last modification on : Wednesday, December 9, 2020 - 3:16:52 PM
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  • HAL Id : tel-00363331, version 1

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Gaëlle Andreatta. Insertion et organisation de nanoparticules à l'intérieur de bicouches de tensioactifs déposées sur substrats solides. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00363331⟩

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