Sedimentation equilibrium in the ultracentrifuge; types obtained with soap solutions

Abstract
The centrifuge has been used in the study of the constitution of solutions by a number of investigators. Des Coudres and Tolman* used it with electrolytes to measure the initial tendency towards sedimentation without, however, prolonging the experiment sufficiently to allow the sedimentation to take place, but measuring the e. m. f. instantaneously set up in a centrifugal as in a gravitational field. Work on ordinary electrolytes has been in abeyance for twenty years. To Svedberg is due the remarkable achievement of realising centrifuges of high power in which the process and attainment of sedimentation may be observed by optical methods throughout the operation of the centrifuge. This introduces a new and invaluable quantitative instrument of singular power for the examination of innumerable problems in colloid and chemical science.

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