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Crossroads between Structure and Mechanics in Nanocomposites styrene-butadien-rubber / silica for tire applications
Auteur(s): Baeza G. , Genix A.-C., Oberdisse J.
Conference: Jülich Soft Matter Days - Seminaris Hotel (Bad Honnef, DE, 2012-11-13)
Résumé: cf. Baeza et al. Macromolecules 2012
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Mechanical Behaviour of Nanosilica reinforced Unvulcanized Styrene-Butadiene-Rubber Nanocomposites
Auteur(s): Baeza G., Genix A.-C., Oberdisse J.
Conference: JMC 13 - Université Montpellier 2 (Montpellier, FR, 2012-08-27)
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Les interactions faibles: structures supramoléculaires et renforcement mécanique.
Auteur(s): Oberdisse J.
Conference: Ecole d'été du Labex Chemisyst/Pole Balard (St Martin de Londres, FR, 2012-09-12)
Résumé: Deux cours dans le cadre de l'école d'été du Labex Chemisyst.
1) Formation de structures supramoléculaires par interactions faibles et leur caractérisation par diffusion de rayonnement.
2) La force des interactions faibles: structure et renforcement dans les nanocomposites.
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Observation of chain structure in nanocomposites
Auteur(s): Oberdisse J., Genix A.-C., Tatou M., Banc A.
Conference: ECIS (European colloid and interface society) 2012 (Malmoe, SE, 2012-09-02)
Résumé: Observation of chain structure in nanocomposites
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Structure of nanoparticles embedded in micellar polycrystals 
Auteur(s): Tamborini E., Ghofraniha N., Oberdisse J., Cipelletti L., Ramos L.
(Article) Publié:
Langmuir, vol. 28 p.8562−8570 (2012)
Texte intégral en Openaccess : 
Ref HAL: hal-00705673_v1
Ref Arxiv: 1205.4746
DOI: 10.1021/la301369z
WoS: 000304783300033
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
23 Citations
Résumé: We investigate by scattering techniques the structure of water-based soft composite materials comprising a crystal made of Pluronic block-copolymer micelles arranged in a face-centered cubic lattice and a small amount (at most 2% by volume) of silica nanoparticles, of size comparable to that of the micelles. The copolymer is thermosensitive: it is hydrophilic and fully dissolved in water at low temperature (T ~ 0{\deg}C), and self-assembles into micelles at room temperature, where the block-copolymer is amphiphilic. We use contrast matching small-angle neuron scattering experiments to probe independently the structure of the nanoparticles and that of the polymer. We find that the nanoparticles do not perturb the crystalline order. In addition, a structure peak is measured for the silica nanoparticles dispersed in the polycrystalline samples. This implies that the samples are spatially heterogeneous and comprise, without macroscopic phase separation, silica-poor and silica-rich regions. We show that the nanoparticle concentration in the silica-rich regions is about tenfold the average concentration. These regions are grain boundaries between crystallites, where nanoparticles concentrate, as shown by static light scattering and by light microscopy imaging of the samples. We show that the temperature rate at which the sample is prepared strongly influence the segregation of the nanoparticles in the grain-boundaries.
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Grain refinement and partitioning of impurities in the grain boundaries of a colloidal polycrystal
Auteur(s): Ghofraniha N., Tamborini E., Oberdisse J., Cipelletti L., Ramos L.
(Article) Publié:
Soft Matter, vol. 8 p.6214-6219 (2012)
Texte intégral en Openaccess :
Ref HAL: hal-00700912_v1
Ref Arxiv: 1203.6524
DOI: 10.1039/c2sm25488c
WoS: 000304309300004
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
28 Citations
Résumé: We study the crystallization of a colloidal model system in presence of secondary nanoparticles acting as impurities. Using confocal microscopy, we show that the nanoparticles segregate in the grain boundaries of the colloidal polycrystal. We demonstrate that the texture of the polycrystal can be tuned by varying independently the nanoparticle volume fraction and the crystallization rate, and quantify our findings using standard models for the nucleation and growth of crystalline materials. Remarkably, we find that the efficiency of the segregation of the nanoparticles in the grain-boundaries is determined solely by the typical size of the crystalline grains.
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