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(254) Production(s) de RAMOS L.
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Equilibrium onions? Copolymer-induced gelation of a lamellar phase into multilamellar vesicles
Auteur(s): Ramos L.
Conference: GDR Complex Fluids : from 3 to 2 Dimensions (Rouen, France, FR, 2005-05-19)
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Copolymer-induced gelation of a lamellar phase into multilamellar vesicles
Auteur(s): Ramos L.
Conference: Softcomp (Ancona, Italy, FR, 2005-05-04)
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Phases hexagonales gonflées : de la physique des vortex à la chimie des matériaux
Auteur(s): Ramos L.
(Séminaires)
laboratoire de Chimie Physique (Orsay, France, FR), 2005-06-10 |
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Equilibrium onions?
Auteur(s): Ramos L.
(Affiches/Poster)
6 th Liquid Matter Conference (Utrecht, Netherlands, FR), 2005-07-01 |
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Equilibrium Onions?
Auteur(s): Ramos L., Roux D., Olmsted P. D., Cates M. E.
(Article) Publié:
Europhysics Letters (Epl), vol. 66 p.888-894 (2004)
Texte intégral en Openaccess :
Ref HAL: hal-00122193_v1
Ref Arxiv: cond-mat/0407021
DOI: 10.1209/epl/i2003-10260-6
WoS: 000223065000018
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
22 Citations
Résumé: We demonstrate the possibility of a stable equilibrium multi-lamellar (``onion'') phase in pure lamellar systems (no excess solvent) due to a sufficiently negative Gaussian curvature modulus. The onion phase is stabilized by non-linear elastic moduli coupled to a polydisperse size distribution (Apollonian packing) to allow space-filling without appreciable elastic distortion. This model is compared to experiments on copolymer-decorated lamellar surfactant systems, with reasonable qualitative agreement.
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Shear-melting of a hexagonal columnar crystal by proliferation of dislocations
Auteur(s): Ramos L., Molino F.
(Article) Publié:
Physical Review Letters, vol. 92 p.018301 (2004)
Texte intégral en Openaccess :
Ref HAL: hal-00122194_v1
PMID 14754024
Ref Arxiv: cond-mat/0407030
DOI: 10.1103/PhysRevLett.92.018301
WoS: 000187968500050
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
16 Citations
Résumé: A hexagonal columnar crystal undergoes a shear-melting transition above a critical shear rate or stress. We combine the analysis of the shear-thinning regime below the melting with that of synchrotron X-ray scattering data under shear and propose the melting to be due to a proliferation of dislocations, whose density is determined by both techniques to vary as a power law of the shear rate with a 2/3 exponent, as expected for a creep model of crystalline solids. Moreover, our data suggest the existence under shear of a line hexatic phase, between the columnar crystal and the liquid phase.
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Time resolved synchrotron x-ray scattering of the crystallization of a soft hexagonal columnar crystal.
Auteur(s): Ramos L.
(Article) Publié:
Langmuir, vol. 20 p.2215-2219 (2004)
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