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Phys Rev Lett. 2004 Nov 26;93(22):224501. Epub 2004 Nov 24.

Collective diffusion model for water permeation through microscopic channels.

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  • 1Theoretical and Computational Biophysics Group, Beckman Institute, University of Illinois at Urbana-Champaign, 405 N. Mathews, Urbana, Illinois 61801, USA.

Abstract

Water permeation through nanometric channels, generally a coupled many-body process, is described in this study by a single collective coordinate. A collective diffusion model is proposed in which water movement at equilibrium is characterized as an unbiased diffusion along this coordinate and water transport in the presence of a chemical potential difference is described as one-dimensional diffusion in a linear potential. The model allows one to determine the osmotic permeability of a water channel from equilibrium simulations.

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