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(254) Production(s) de RAMOS L.
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Synthesis of Ultrathin Hexagonal Palladium Nanosheets 
Auteur(s): Siril Prem F., Ramos L., Beaunier Patricia, Archirel Pierre, Etcheberry Arnaud, Remita Hynd
(Article) Publié:
Chemistry Of Materials, vol. 21 p.5170-5175 (2009)
Ref HAL: hal-00514224_v1
DOI: 10.1021/cm9021134
WoS: 000271234300023
Exporter : BibTex | endNote
89 Citations
Résumé: Ultrathin palladium hexagonal nanosheets were synthesized in emulsions constituted of droplets of toluene containing Pd complexes in water and stabilized by CTAB as surfactant and in quaternary mesophases formed by water, toluene containing Pd complexes, CTAB, and a cosurfactant. We have identified slow reduction and nucleation provided by CO and adsorption at the CTAB interface as key factors for the formation of Pd nanosheets. These nanosheets exhibit a broad absorption band from the visible to the near-infrared region.
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Biomimetic membranes to investigate the interplay between specific proteins and lipids with action
Auteur(s): Ramos L.
Conference: SOFTCOMP topical meeting on "Self Assembly and Biomimetics" (Rehovot, Israel, FR, 2009-03-11)
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Phases hexagonales gonflées: de la physique des fluides à seuil à la chimie des nanomatériaux
Auteur(s): Ramos L.
(Séminaires)
Centre de Recherche Paul Pascal (pessac, FR), 2008-10-01 |
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Surfactant Hexagonal Phases: From the Physics of Yield Stress Fluids to the Chemistry of Materials
Auteur(s): Ramos L.
(Séminaires)
Department of Engineering and Applied Sciences, Harvard University (Cambridge, US), 2008-05-29 |
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Phases hexagonales gonflées: de la physique des fluides à seuil à la chimie des nanomatériaux
Auteur(s): Ramos L.
(Séminaires)
Laboratoire "Polymères et Matériaux Avancés"; CNRS/Rhodia Recherches et Technologies (Lyon, FR), 2008-01-24 |
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Ductility versus Brittleness in Self-Assembled Transient Networks
Auteur(s): Tabuteau Hervé, Mora S., Ramos L., Porte Grégoire, Ligoure C.
Conference: International Symposium on Non-Equilibrium Soft Matter (Kyoto, JP, 2008-06-02)
Actes de conférence: PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, vol. p.47-53 (2008)
Ref HAL: hal-00503273_v1
Exporter : BibTex | endNote
Résumé: We show that two types of complex fluids belonging to the same class of soft materials (transient networks), and having the same linear rheological properties (Maxwell fluids) exhibit two distinct fracture behaviors as solids do. We have designed a third experimental system that captures the distinct features of both former ones. We show that it could be a good candidate to investigate the brittle-ductile transition in complex fluids.
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Direct-space investigation of the ultraslow ballistic dynamics of a soft glass
Auteur(s): Mazoyer Sylvain, Cipelletti L., Ramos L.
(Article) Publié:
Physical Review E: Statistical, Nonlinear, And Soft Matter Physics, vol. 79 p.011501 (2009)
Texte intégral en Openaccess : 
Ref HAL: hal-00323837_v1
PMID 19257036
Ref Arxiv: 0809.3995
DOI: 10.1103/PhysRevE.79.011501
WoS: 000262976600049
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
10 Citations
Résumé: We use light microscopy to investigate the aging dynamics of a glass made of closely packed soft spheres, following a rapid transition from a fluid to a solid-like state. By measuring time-resolved, coarse-grained displacements fields, we identify two classes of dynamical events, corresponding to reversible and irreversible rearrangements, respectively. The reversible events are due to the small, experimentally unavoidable fluctuations of the temperature imposed to the sample, leading to transient thermal expansions and contractions that cause shear deformations. The irreversible events are plastic rearrangements, induced by the repeated shear cycles. We show that the displacement due to the irreversible rearrangements grows linearly with time, both on average and at a local level. The velocity associated with this ballistic motion decreases exponentially with sample age, accounting for the observed slowing down of the dynamics. The displacement field due to the irreversible rearrangements has a vortex-like structure and is spatially correlated over surprisingly long distances.
Commentaires: 10 pages, 7 figures, submitted to PRE
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