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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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BEGIN:VEVENT
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DTSTART;TZID=Europe/Paris:20220114T110000
DTEND;TZID=Europe/Paris:20220114T120000
DTSTAMP:20211117T095600
UID:MEC-bf2fb7d1825a1df3ca308ad0bf48591e@lps.u-psud.fr
CREATED:20211117
LAST-MODIFIED:20220110
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Valerio Sorichetti – Dynamics of nanoparticles in polydisperse polymer networks: From free diffusion to hopping
DESCRIPTION:\nLPTMS, Université Paris-Saclay – CNRS\n\n\n\nUsing molecular dynamics simulations we study the static and dynamic properties of spherical nanoparticles (NPs) embedded in a disordered and polydisperse polymer network. Purely repulsive (RNP) as well as weakly attractive (ANP) polymer-NP interactions are considered. It is found that for both types of particles the NP dynamics at intermediate and at long times is controlled by the confinement parameter C=σN/λ, where σN is the NP diameter and λ is the dynamic localization length of the crosslinks. Three dynamical regimes are identified: i) For weak confinement (C≲1) the NPs can freely diffuse through the mesh; ii) For strong confinement (C≳1) NPs proceed by means of activated hopping; iii) For extreme confinement (C≳3) the mean squared displacement shows on intermediate time scales a quasi-plateau since the NPs are trapped by the mesh for very long times. Escaping from this local cage is a process that depends strongly on the local environment, thus giving rise to an extremely heterogeneous relaxation dynamics. The simulation data are compared with the two main theories for the diffusion process of NPs in gels. Both theories give a very good description of the C−dependence of the NP diffusion constant, but fail to reproduce the heterogeneous dynamics at intermediate time scales.\n\n\n\nCyrille Hamon vous invite à une réunion Zoom planifiée.\n\n\n\nSujet : Zoom meeting invitation – Réunion Zoom de Cyrille HamonHeure : 14 janv. 2022 11:00 AM Paris\n\n\n\nParticiper à la réunion Zoomhttps://us02web.zoom.us/j/89804085144?pwd=aHMvZjJJU1p1ekhIN3JDUS96WmdKdz09\n\n\n\nID de réunion : 898 0408 5144Code secret : GuW7gE\n
URL:https://www.lps.u-psud.fr/events/valerio-sorichetti/
CATEGORIES:Séminaire Matière Molle Phys-Bio
LOCATION:Bât 510, Orsay (91)
ATTACH;FMTTYPE=image/png:https://www.lps.u-psud.fr/wp-content/uploads/2021/11/toc_graphic_gel_np.png
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