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Diffusional boundary spreading in the ultracentrifuge

โœ Scribed by George H. Weiss; Menachem Dishon

Publisher
Wiley (John Wiley & Sons)
Year
1970
Tongue
English
Weight
371 KB
Volume
9
Category
Article
ISSN
0006-3525

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โœฆ Synopsis

Abstract

A common approximation for deriving solutions to the Lamm equation is to neglect diffusion. This paper presents a singular perturbation technique that allows one to estimate the band spreading due to nonzero diffusion coefficient. We illustrate the general mathematical technique by its application to sedimentation when pressure effects are important. Comparison of the approximate solution with accurate numerical solutions shows that the relative errors are of the order of 1% both for concentration and concentration gradient for parameters of chemical interest.

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