Stokes-Einstein relation: Difference between revisions
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The '''Stokes-Einstein relation''', originally derived by William Sutherland <ref>William Sutherland "A dynamical theory of diffusion for non-electrolytes and the molecular mass of albumin", Philosophical Magazine '''9''' pp. 781-785 (1905)</ref> but almost simultaneously published by [[Albert Einstein |Einstein]] <ref>[http://dx.doi.org/10.1002/andp.19053220806 A. Einstein "Über die von der molekularkinetischen Theorie der Wärme geforderte Bewegung von in ruhenden Flüssigkeiten suspendierten Teilchen", Annalen der Physik '''17''' pp. 549-560 (1905)]</ref>, states that, for a sphere of radius <math>R</math> immersed in a fluid, | The '''Stokes-Einstein relation''', originally derived by William Sutherland <ref>[http://dx.doi.org/10.1080/14786440509463331 William Sutherland "A dynamical theory of diffusion for non-electrolytes and the molecular mass of albumin", Philosophical Magazine '''9''' pp. 781-785 (1905)]</ref> but almost simultaneously published by [[Albert Einstein |Einstein]] <ref>[http://dx.doi.org/10.1002/andp.19053220806 A. Einstein "Über die von der molekularkinetischen Theorie der Wärme geforderte Bewegung von in ruhenden Flüssigkeiten suspendierten Teilchen", Annalen der Physik '''17''' pp. 549-560 (1905)]</ref>, states that, for a sphere of radius <math>R</math> immersed in a fluid, | ||
:<math> D=\frac{k_B T}{6\pi\eta R}, </math> | :<math> D=\frac{k_B T}{6\pi\eta R}, </math> | ||
Latest revision as of 12:28, 14 October 2011
The Stokes-Einstein relation, originally derived by William Sutherland [1] but almost simultaneously published by Einstein [2], states that, for a sphere of radius immersed in a fluid,
where D is the diffusion constant, is the Boltzmann constant, T is the temperature and is the viscosity. Sometimes, the name is given to the general relation:
where is the mobility. This, coupled with Stokes' law for the drag upon a sphere moving though a fluid:
produces the first equation.
References[edit]
- ↑ William Sutherland "A dynamical theory of diffusion for non-electrolytes and the molecular mass of albumin", Philosophical Magazine 9 pp. 781-785 (1905)
- ↑ A. Einstein "Über die von der molekularkinetischen Theorie der Wärme geforderte Bewegung von in ruhenden Flüssigkeiten suspendierten Teilchen", Annalen der Physik 17 pp. 549-560 (1905)
- Related reading
- Robert Zwanzig and Alan K. Harrison "Modifications of the Stokes–Einstein formula", Journal of Chemical Physics 83 pp. 5861-5862 (1985)
- M. Cappelezzo, C. A. Capellari, S. H. Pezzin, and L. A. F. Coelho "Stokes-Einstein relation for pure simple fluids", Journal of Chemical Physics 126 224516 (2007)
- J. Brillo, A. I. Pommrich, and A. Meyer "Relation between Self-Diffusion and Viscosity in Dense Liquids: New Experimental Results from Electrostatic Levitation", Physical Review Letters 107 165902 (2011)