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キーワード:
FIELD GRADIENT NMR; FLUORESCENCE CORRELATION SPECTROSCOPY;
MONTE-CARLO-SIMULATION; POROUS-MEDIA; PHASE-SEPARATION; LIPID-MEMBRANES;
COEFFICIENT; WATER; SUBDIFFUSION; MOLECULESPhysics; Spectroscopy;
要旨:
We consider the process of self-diffusion in the cellular structure in the presence of permeable barriers in long time regime. Based on the most general concepts of the translation mobility and geometry of a heterogeneous system, an expression for the self-diffusion coefficient of liquid molecules in such a medium in a long time regime was derived. We have shown that the value of the self-diffusion coefficient in the long-time limit is determined by the probability of interaction of the diffusant molecule with an obstacle. We obtained an expression for the probability of such interaction as a function of the surface-to-volume ratio (S/V). Comparing the obtained analytical expression with the results of computer simulation was performed. Shown the exponential dependence of the self-diffusion coefficient on the barrier pinning density.
