ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
A correlation function expression for the zero wave vector and frequency diffusion permeabilities for membranes having multiple potential barriers is derived for systems linearly displaced from equilibrium. The calculation of these correlation functions is discussed within the context of projection operator theory, and the resulting theory is applied to a model membrane system containing pores similar to those formed by gramicidin A. Stochastic simulations are performed using the BGK model and position dependent diffusion constants are obtained for Na+, Li+, and Rb+ at 300 K. The permeability can be computed from short-time dynamical information, although some commonly made approximations on memory functions are found to be incorrect.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.451205
