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Anisotropic reinforcement of nanocomposites tuned by magnetic orientation of the filler network
Auteur(s): Jestin J., Cousin F., Dubois I., Ménager C., Schweins R., Oberdisse J., Boué F.
(Article) Publié:
Advanced Materials, vol. 20 p.2533-2540 (2008)
Résumé: We present a new material which displays anisotropic and mechanical properties tuneable during synthesis under magnetic field. It is formulated by mixing aqueous suspensions of polymer nanolatex and magnetic nanoparticles, coated by a thin silica layer to improve their compatibility with the polymeric matrix, followed by casting. The magnetic properties of these nanoparticles enable their pre-orientation in the resulting nanocomposite when cast under magnetic field. Detailed insight on dispersion by Small Angle Neutron Scattering (SANS) shows chainlike nanoparticle aggregates aligned by the field on the nanometer scale. Applying strain to the nanocomposite parallel to the particle chains shows higher mechanical reinforcement, than when strain is transverse to field. . SANS from strained samples shows that strain parallel to the field induce an organization of the chains while strain perpendicular to the field destroys the chain field-induced ordering. Thus improved mechanical reinforcement is obtained from anisotropic interconnection of nanoparticle aggregates.
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Universal scattering behavior of co-assembled nanoparticle-polymer clusters
Auteur(s): Fresnais J., Berret J. -F., Qi L., Chapel J. -P., Castaing J. -C., Sandre O., Frka-Petesic B., Perzynski R., Oberdisse J., Cousin F.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 78 p.040401 (R) (2008)
Texte intégral en Openaccess :
Ref HAL: hal-00417665_v1
PMID 18999367
Ref Arxiv: 0902.3936
DOI: 10.1103/PhysRevE.78.040401
WoS: 000260573800005
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
32 Citations
Résumé: Water-soluble clusters made from 7 nm inorganic nanoparticles have been investigated by small-angle neutron scattering. The internal structure factor of the clusters was derived and exhibited a universal behavior as evidenced by a correlation hole at intermediate wave-vectors. Reverse Monte-Carlo calculations were performed to adjust the data and provided an accurate description of the clusters in terms of interparticle distance and volume fraction. Additional parameters influencing the microstructure were also investigated, including the nature and thickness of the nanoparticle adlayer.
Commentaires: 5 pages, 4 figures, paper published in Physical Review E
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Structural Characterisation of Carborane-loaded liposomes on the Nanoscale using Scattering Techniques
Auteur(s): Oberdisse J.
Conference: International Society for Neutron Capture Therapy (Florence, Italy, FR, 2008-11-02)
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Nanostructures de polymères et particules vues par diffusion de neutrons aux petits angles
Auteur(s): Oberdisse J.
Conférence invité: Colloque National du GFP 2008 Remise du prix du GFP/SFP (Lyon, France, FR, 2008-11-25)
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Co-Organisation Mini-Colloque JMC11
Auteur(s): Oberdisse J.
Conférence invité: 11ème Journées de la Matière Condensée (Strasbourg, France, FR, 2008-08-29)
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Structure détermination in Soft Condensed Matter : Silica Polymer Nanocomposites, Small Angle Scattering, and Simulations
Auteur(s): Oberdisse J.
Conférence invité: Kolloqium (Berlin, DE, 2008-04-21)
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Small-angle scattering from self-assembled and hierarchical structures
Auteur(s): Oberdisse J.
(Séminaires)
Université de Copenhagen (Copenhagen, Sweden, FR), 2008-09-27 |