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Fundamental Aspects of Diffusion Processes
Author(s) -
Jost W.
Publication year - 1964
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.196407131
Subject(s) - diffusion , diffusion process , anomalous diffusion , random walk , anisotropic diffusion , molecular diffusion , statistical physics , diffusion equation , simple (philosophy) , anisotropy , thermodynamics , mathematics , physics , computer science , innovation diffusion , statistics , optics , metric (unit) , knowledge management , operations management , epistemology , philosophy , economy , economics , service (business)
A simple description of diffusion processes and a derivation of the general laws of diffusion are given. The distribution with time of particles according to a random‐walk process is considered and compared with results derived from a differential equation. Diffusion coefficients for and examples of diffusion processes in various media (e.g. gases, solutions, solids, and high polymers) are given. “Uphill” diffusion, i.e. diffusion against the concentration gradient is also discussed. In addition, diffusion in anisotropic systems, in systems consisting of more than one phase and in multicomponent systems is treated.