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.
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
Domaines
Matière Molle [cond-mat.soft]
Origine : Fichiers produits par l'(les) auteur(s)
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