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- W3100698655 abstract "Particle settling is a pervasive process in nature, and centrifugation is a much versatile separation technique. Yet, the results of settling and ultracentrifugation experiments often appear to contradict the very law on which they are based: Archimedes Principle - arguably, the oldest Physical Law. The purpose of this paper is delving at the very roots of the concept of buoyancy by means of a combined experimental-theoretical study on sedimentation profiles in colloidal mixtures. Our analysis shows that the standard Archimedes' principle is only a limiting approximation, valid for mesoscopic particles settling in a molecular fluid, and we provide a general expression for the actual buoyancy force. This Generalized Archimedes Principle accounts for unexpected effects, such as denser particles floating on top of a lighter fluid, which in fact we observe in our experiments." @default.
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- W3100698655 date "2012-01-01" @default.
- W3100698655 modified "2023-09-24" @default.
- W3100698655 title "What buoyancy really is. A generalized Archimedes' principle for sedimentation and ultracentrifugation" @default.
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- W3100698655 doi "https://doi.org/10.1039/c2sm26120k" @default.
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