155 articles – 192 Notices  [english version]
 Fiche détaillée Articles dans des revues avec comité de lecture
 Physical Review Letters 108, 10 (2012) 108303
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 SolidVesicles.pdf(2.3 MB)
 Gel-phase vesicles buckle into specific shapes
 Osmotic deflation of giant vesicles in the rippled gel-phase $P_{\beta '}$ gives rise to a large variety of novel faceted shapes. These shapes are also found from a numerical approach by using an elastic surface model. A shape diagram is proposed based on the model that accounts for the vesicle size and ratios of three mechanical constants: in-plane shear elasticity and compressibility (usually neglected) and out-of-plane bending of the membrane. The comparison between experimental and simulated vesicle morphologies reveals that they are governed by a typical elasticity length, of the order of one micron, and must be described with a large Poisson's ratio.
 Mots Clés : Buckling – thin shells – capsules – spherical shells – elastic surfaces – Föppl-von Karman – folds – extreme deformations – axisymmetric buckling – elasticity – curvature – in-plane compressibility – stretch modulus – bending modulus – thin plate – gaussian curvature – vesicles – gel-phase vesicles – GUV – DMPC – rippled phase – stomatocyte – discocyte – biconcave – facetted
 hal-00649424, version 1 http://hal.archives-ouvertes.fr/hal-00649424 oai:hal.archives-ouvertes.fr:hal-00649424 Contributeur : Catherine Quilliet <> Soumis le : Mercredi 7 Décembre 2011, 21:24:37 Dernière modification le : Mardi 3 Avril 2012, 16:17:20