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Transition vitreuse, hétérogénéité dynamique et vieillissement dans les systèmes a dynamique lente
(49) Production(s) de l'année 2017
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The glass transition of soft colloids
Auteur(s): Cipelletti L.
(Séminaires)
UMR Gulliver, ESPCI Paris (Paris, FR), 2017-01-16 |
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Microscopic dynamics and mechanical behavior of amorphous solids
Auteur(s): Cipelletti L.
(Séminaires)
Center for complexity & Biosystems, University of Milan (Milan, IT), 2017-04-03 |
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The glass transition of soft colloids 
Auteur(s): Cipelletti L.
Conférence invité: 8th IDMRCS (Wisla, PL, 2017-07-23)
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Mucus as an Arrested Phase Separation Gel
Auteur(s): Philippe A. M., Cipelletti L. , Larobina Domenico
(Article) Publié:
Macromolecules, vol. 50 p.8221-8230 (2017)
Ref HAL: hal-01934572_v1
DOI: 10.1021/acs.macromol.7b00842
WoS: 000413885100043
Exporter : BibTex | endNote
7 Citations
Résumé: We investigate the spontaneous restructuring andaging behavior of pig gastric mucus gels by combining rheology andnonconventional static and dynamic light scattering. We find that themucus elasticity weakens over time, concomitantly to structuralevolution toward a locally more compact configuration and the onsetof large scale density fluctuations. We interpret this behavior asstemming from an arrested phase separation, as observed in manygel-forming polymer systems. This scenario is confirmed by spaceandtime-resolved dynamic light scattering data, showing that the gelrestructuring is due to intermittent bursts of spatially correlatedrearrangements, leading to ballistic dynamics.
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Structuring polymer gels via catalytic reactions
Auteur(s): Hugouvieux Virginie, Kob W.
(Article) Publié:
Soft Matter, vol. 13 p.8706-8716 (2017)
Texte intégral en Openaccess : 
Ref HAL: hal-01837825_v1
DOI: 10.1039/C7SM01814B
WoS: 000416556000005
Exporter : BibTex | endNote
2 Citations
Résumé: We use computer simulations to investigate how a catalytic reaction in a polymer sol can induce the formation of a polymer gel. To this aim we consider a solution of homopolymers in which freely-diffusing catalysts convert the originally repulsive A monomers into attractive B ones. We find that at low temperatures this reaction transforms the polymer solution into a physical gel that has a remarkably regular mesostructure in the form of a cluster phase, absent in the usual homopolymer gels obtained by a quench in temperature. We investigate how this microstructuring depends on catalyst concentration, temperature, and polymer density and show that the dynamics for its formation can be understood in a semi-quantitative manner using the interaction potentials between the particles as input. The structuring of the copolymers and the AB sequences resulting from the reactions can be discussed in the context of the phase behaviour of correlated random copolymers. The location of the spinodal line as found in our simulations is consistent with analytical predictions. Finally, we show that the observed structuring depends not only on the chemical distribution of the A and B monomers but also on the mode of formation of this distribution.
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