The Stokes-Einstein law by macroscopic arguments

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The Stokes-Einstein law, which expresses the diffusion coefficient in terms of solvent viscosity and solute molecular radius, is based on the assumption that a diffusing ion or molecule moves among solute molecules as a macroscopic entity does in a continuum. Since the small dimension of the diffusing species often renders this assumption untenable, whereas experiments support the validity of the law, a new deduction is proposed, based on elementary macroscopic laws of thermodynamics, hydrodynamics and diffusion. Comparison of the laws by Fick and by Hagen and Poiseuille results in the Stokes-Einstein formula.

Original languageEnglish
Pages (from-to)549-550
Number of pages2
JournalRadiation Physics and Chemistry
Volume37
Issue number3
Publication statusPublished - 1991

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solutes
deduction
molecules
diffusion coefficient
hydrodynamics
viscosity
continuums
thermodynamics
radii
ions

ASJC Scopus subject areas

  • Radiation

Cite this

The Stokes-Einstein law by macroscopic arguments. / Schiller, R.

In: Radiation Physics and Chemistry, Vol. 37, No. 3, 1991, p. 549-550.

Research output: Contribution to journalArticle

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