Swelling of particle-encapsulating random manifolds

Details Swelling of particle-encapsulating random manifolds Swelling of particle-encapsulating random manifolds

2008-06-23

arxiv.org/abs/0806.3618v2

Phys. Rev. E 78, 021132 (2008)

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 6 figures

Scientific paper

10.1103/PhysRevE.78.021132

We study the statistical mechanics of a closed random manifold of fixed area and fluctuating volume, encapsulating a fixed number of noninteracting particles. Scaling analysis yields a unified description of such swollen manifolds, according to which the mean volume gradually increases with particle number, following a single scaling law. This is markedly different from the swelling under fixed pressure difference, where certain models exhibit criticality. We thereby indicate when the swelling due to encapsulated particles is thermodynamically inequivalent to that caused by fixed pressure. The general predictions are supported by Monte Carlo simulations of two particle-encapsulating model systems -- a two-dimensional self-avoiding ring and a three-dimensional self-avoiding fluid vesicle. In the former the particle-induced swelling is thermodynamically equivalent to the pressure-induced one whereas in the latter it is not.

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