Polymer-nanoparticle complexes: from dilute solution to solid state |
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Authors: | Berret Jean-François Yokota Kazuhiko Morvan Mikel Schweins Ralf |
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Affiliation: | Matière et Systèmes Complexes, UMR CNRS no. 7057, Université Denis Diderot Paris-VII, 140 rue de Lourmel, 75015 Paris, France. jean-francois.berret@paris7.jussieu.fr |
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Abstract: | We report on the formation and the structural properties of "supermicellar" aggregates made from mineral nanoparticles and polyelectrolyte-neutral block copolymers in aqueous solutions. The mineral particles put under scrutiny are ultrafine and positively charged yttrium hydroxyacetate nanoparticles. Combining light, neutron, and X-ray scattering experiments, we have characterized the sizes and the aggregation numbers of the organic-inorganic complexes. We have found that the hybrid aggregates have typical sizes in the range of 100 nm and exhibit a remarkable colloidal stability with respect to ionic strength and concentration variations. Solid films with thicknesses up to several hundreds of micrometers were cast from solutions, resulting in a bulk polymer matrix in which nanoparticle clusters are dispersed and immobilized. It was found in addition that the structure of the complexes remains practically unchanged during film casting. |
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