An ensemble of vesicles in two dimensions
Department of Chemistry, Technical University of Denmark,
Building 207, DK-2800 Lyngby, Denmark
Accepted: 26 August 1997
An off-lattice model of a vesicle assembly in two dimensions is studied by use of computer simulation techniques. The vesicles are represented as closed, self-avoiding tethered chains with bending rigidity. We present studies for a system of fluctuating vesicle configurations, where the total number of monomers is fixed, but the vesicle size distribution may vary, i.e. the vesicles can fuse or break up. The phase diagram obtained in the case of zero osmotic pressure contains a vesicle phase with broken in-out symmetry and a symmetric "bicontinuous” phase. The phases are separated by a line of Ising-type second-order phase transitions, and the functional form of the phase boundary is derived from simple scaling arguments.
PACS: 82.65.Dp – Thermodynamics of surfaces and interfaces / 05.00 – Statistical physics and thermodynamics / 68.00 – Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)
© EDP Sciences, 1997