| Auteur(s) |
François Quéméneur ( )1, 2, Catherine Quilliet ()3, Magalie Faivre ()4, Annie Viallat ()5, Brigitte Pépin-Donat ()1 |
| Laboratoire |
|
| Domaine |
Physique/Matière Condensée/Matière Molle
|
| Titre |
Gel-phase vesicles buckle into specific shapes |
| Résumé |
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. |
| Langue du texte intégral |
Anglais |
|
| Journal |
Physical Review Letters |
| Audience |
internationale |
| Date de publication |
09/03/2012 |
| Volume |
108 |
| Numéro |
10 |
| Page, identifiant, ... |
108303 |
|
| 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 |
| Classification |
pacs{46.32.+x ; 87.16.D- ; 87.16.dm} |
|
