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Dynamics of glassy colloidal suspensions under gravitational stress
Auteur(s): Cipelletti L.
(Séminaires)
Université de Cologne (Cologne, DE), 2013-02-12 |
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Method for determining the size distribution of a mixture of particles using taylor dispersion, and associated system. 
Auteur(s): Cottet Hervé, Cipelletti L., Martin Fernandez M., Biron Jean-Philippe
Brevet: #WO2014001409A1, (2014)
Ref HAL: hal-00827399_v1
Exporter : BibTex | endNote
Résumé: This method comprises steps consisting in: injecting (100) a sample into a capillary tube; conveying (110) the sample along the capillary tube, under experimental conditions able to generate a Taylor dispersion effect; generating (120) a signal characterising the Taylor dispersion; processing (130) said signal to obtain the experimental Taylor signal Ŝ(t); and analysing (200) said experimental Taylor signal Ŝ(t). The analyzing step consists in obtaining an amplitude distribution P(G(c)) allowing said experimental Taylor signal Ŝ(t) to be decomposed into a sum of Gaussian functions by implementing a constraint-solving algorithm consisting in minimising a cost function Ha comprising at least one constraint term associated with a constraint that the amplitude distribution P(G(c)) must respect, this minimisation being carried out over a range of values of interest of a parameter G(c) characterising the Gaussian amplitude function P(G(c)).
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Atomic-scale relaxation dynamics and aging in a metallic glass probed by X-ray photon correlation spectroscopy
Auteur(s): Ruta Beatrice, Chushkin Y., Monaco G., Cipelletti L., Pineda E., Bruna P., Giordano V. M., Gonzalez-Silveira M.
(Article) Publié:
Physical Review Letters, vol. 109 p.165701 (2012)
Texte intégral en Openaccess : 
Ref HAL: hal-00743822_v1
Ref Arxiv: 1209.2030
DOI: 10.1103/PhysRevLett.109.165701
WoS: 000309905400007
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
184 Citations
Résumé: We use X-Ray Photon Correlation Spectroscopy to investigate the structural relaxation process in a metallic glass on the atomic length scale. We report evidence for a dynamical crossover between the supercooled liquid phase and the metastable glassy state, suggesting different origins of the relaxation process across the transition. Furthermore, using different cooling rates we observe a complex hierarchy of dynamic processes characterized by distinct aging regimes. Strong analogies with the aging dynamics of soft glassy materials, such as gels and concentrated colloidal suspensions, point at stress relaxation as a universal mechanism driving the relaxation dynamics of out-of-equilibrium systems.
Commentaires: 6 pages, 4 figure. published in Phys. Rev. Lett
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Sedimentation dans les melanges binaires de spheres dures colloidales
Auteur(s): Cipelletti L., Roger V.
Conference: Réunion GdR MFA (Porticcio, FR, 2012-10-10)
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Multiangle static and dynamic light scattering in the intermediate scattering angle range
Auteur(s): Tamborini E., Cipelletti L.
(Article) Publié:
Review Of Scientific Instruments, vol. 83 p.093106 (2012)
Texte intégral en Openaccess :
Ref HAL: hal-00725045_v1
PMID 23020361
Ref Arxiv: 1208.6393
DOI: 10.1063/1.4751864
WoS: 000309426700007
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
12 Citations
Résumé: We describe a light scattering apparatus based on a novel optical scheme covering the scattering angle range $0.5\dg \le \theta \le 25\dg$, an intermediate regime at the frontier between wide angle and small angle setups that is difficult to access by existing instruments. Our apparatus uses standard, readily available optomechanical components. Thanks to the use of a charge-coupled device detector, both static and dynamic light scattering can be performed simultaneously at several scattering angles. We demonstrate the capabilities of our apparatus by measuring the scattering profile of a variety of samples and the Brownian dynamics of a dilute colloidal suspension.
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Supradiffusive dynamics: from metallic glasses to actin networks
Auteur(s): Cipelletti L.
Conférence invité: Complex transport in strongly interacting systems (Munich, DE, 2012-07-25)
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