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Structural characterization of cationic liposomes loaded with sugar-based carboranes
Auteur(s): Ristori S., Oberdisse J., Grillo I., Donati A., Spallak O.
(Article) Publié:
Biophysical Journal, vol. 88 p.535-547 (2005)
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Structure and rheological properties of soft-hard nanocomposites: Influence of aggregation and interfacial modification 
Auteur(s): Oberdisse J., El Harrak Abdeslam, Carrot Géraldine, Jestin Jacques, Boué François
(Article) Publié:
E-Polymers, vol. 46 p.6695-6705 (2005)
Texte intégral en Openaccess : 
Ref HAL: hal-00003639_v1
Ref Arxiv: cond-mat/0412480
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: A study of the reinforcement effect of a soft polymer matrix by hard nanometric filler particles is presented. In the main part of this article, the structure of the silica filler in the matrix is studied by Small Angle Neutron Scattering (SANS), and stress-strain isotherms are measured to characterize the rheological properties of the composites. Our analysis allows us to quantify the degree of aggregation of the silica in the matrix, which is studied as a function of pH (4-10), silica volume fraction (3-15%) and silica bead size (average radius 78 Å and 96 Å). Rheological properties of the samples are represented in terms of the strain-dependent reinforcement factor, which highlights the contribution of the filler. Combining the structural information with a quantitative analysis of the reinforcement factor, the aggregate size and compacity (10%-40%) as a function of volume fraction and pH can be deduced. In a second, more explorative study, the grafting of polymer chains on nanosilica beads for future reinforcement applications is followed by SANS. The structure of the silica and the polymer are measured separately by contrast variation, using deuterated material. The aggregation of the silica beads in solution is found to decrease during polymerization, reaching a rather low final aggregation number (less than ten).
Commentaires: 17/12/2004
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Control of the colloidal stability of polymer-grafted-silica nanoparticles obtained by Atom Transfer Radical Polymerization.
Auteur(s): El Harrak A., Carrot G., Oberdisse J., Jestin J., Boue F.
(Article) Publié:
Macromolecular Symposia, vol. 226 p.263-278 (2005)
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Atom transfer radical polymerization from silica nanoparticles using the Grafting from method and structural study via small-angle neutron scattering.
Auteur(s): El Harrak A., Carrot G., Oberdisse J., Jestin J., Boue F.
(Article) Publié:
E-Polymers, vol. 46 p.1095 - 1104 (2005)
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Electrostatic Self-assembly : A New Route Towards Nanostructures
Auteur(s): Berret Jean-françois, Herve P., Morvan M., Yokota K., Destarac M., Oberdisse J., Grillo I., Schweins R.
(Article) Publié:
-Institute Laue-Langevin Soft Matter Brochure, vol. to appear p. (2005)
Résumé: During the last 3 years, our group has investigated extensively the complexation mechanism between neutral-polyelectrolyte block copolymers with oppositely charged species. These species are surfactant micelles, multivalent counterions and inorganic nanoparticles. In the three cases, we have established the thermodynamical phase diagram of these systems, and found broad regions where supramolecular aggregates spontaneously form via electrostatic self-assembly. From earlier works, it was suspected that these mixed colloids exhibit a core-shell structure. However, their inner structure was unveiled by us only recently, using a combination of light, neutron and x-ray scattering experiments.
Commentaires: 5 pages, 4 figures, to appear in Institute Laue-Langevin Soft Matter Brochure
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Structure of Silica-Latex Nanocomposites by SANS.
Auteur(s): Oberdisse J.
Conference: Journée en l'honneur de Jean-Pierre Cotton (, FR, 2005-01)
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Structure of silica aggregates in a soft polymeric matrix by SANS
Auteur(s): Oberdisse J.
Conference: Softcomp, Network Area Meeting (San Sebastian, Spain, FR, 2005-01)
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