title: Gel phase vesicles buckle into specific shapes.
abstract: Osmotic deflation of giant vesicles in the rippled gel phase P(β') 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 1   μm, and must be described with a large Poisson's ratio.
authors.affiliation: UMR5819 SPrAM (CEA-CNRS-Univ. Grenoble)/INAC/CEA-Grenoble, France.
authors.forename: François
authors.initials: F
authors.lastname: Quemeneur
authors.forename: Catherine
authors.initials: C
authors.lastname: Quilliet
authors.forename: Magalie
authors.initials: M
authors.lastname: Faivre
authors.forename: Annie
authors.initials: A
authors.lastname: Viallat
authors.forename: Brigitte
authors.initials: B
authors.lastname: Pépin-Donat
mesh_terms: D004548:Elasticity; D005782:Gels / Q000737:chemistry*; D008566:Membranes / Q000737:chemistry; D008956:Models, Chemical; D016012:Poisson Distribution; D013499:Surface Properties
chemical_list: D005782:Gels