Nanoparticles syntheses and assemblies

Céline Burel 1
1 LRSM - Laboratoire des Recherches sur les Sciences de la Matière
IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers : DRF/IRFU
Abstract : Nanoparticles (NPs) assembled into two- or three-dimensional architectures offer new collective optical, magnetic and electronic properties. For instance, closely packed gold (Au) and silver (Ag) NPs absorb light at higher wavelength than when they are far apart. In the first part of this thesis, the technique of microfluidic pervaporation is used to assemble micron size latex particles and Au NPs in bulky materials of controlled dimensions. By reducing the concentration of salts in the particles dispersions, the particles organize in hexagonal crystals. Millimeter-long materials of small well-organized densely packed particles are collected, offering solid groundwork as for the design of new functional microscale optomaterials. In the second part of this thesis, the assembly of NPs on droplets is used to fabricate dispersed materials. By tuning the charges and wettability of Au and Ag NPs, they adsorb at the surface of emulsion droplets. A subsequent polymerization at the interface of the emulsion allows to lock the NPs inside an organic shell. In well-defined conditions, novel Au NP-silica microcapsules responsive to mechanical strains and Au NP-polyacrylate microcapsules responsive to pH variations are engineered. These microcapsules change color during their deformation due to the increase of the distance between the Au NPs. Each one of the microcapsules being one sensor by itself, these results pave the way as for the design of new microscale sensors.
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Céline Burel. Nanoparticles syntheses and assemblies. Chemical Physics [physics.chem-ph]. Université Pierre et Marie Curie - Paris VI, 2017. English. ⟨NNT : 2017PA066207⟩. ⟨tel-01680738v2⟩

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