On the Physics of Size Selectivity

Details On the Physics of Size Selectivity On the Physics of Size Selectivity

2005-11-07

arxiv.org/abs/cond-mat/0511169v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, Phys. Rev. Lett. (accepted)

Scientific paper

10.1103/PhysRevLett.95.247801

We demonstrate that two mechanisms used by biological ion channels to select particles by size are driven by entropy. With uncharged particles in an infinite cylinder, we show that a channel that attracts particles is small-particle selective and that a channel that repels water from the wall is large-particle selective. Comparing against extensive density-functional theory calculations of our model, we find that the main physics can be understood with surprisingly simple bulk models that neglect the confining geometry of the channel completely.

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