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- W103663583 abstract "When a dispersion is centrifuged the particles, if of different density to that of the dispersion medium, move to the bottom or top of the tube. Increase of centrifuge speed then leads to a progressive and (relatively) irreversible coagulation or coalescence starting at the extreme end of the sediment or cream. If the extent of this cohesion is measured as a function of centrifuge speed then the maximum force (or pressure) between particles or droplets can be calculated. In this paper the method has first been validated by centrifuging silver iodide sols, obtaining forces in satisfactory agreement with expected electrostatic/van der Waals interactions. The technique has then been applied to paraffin oil-in-water emulsions stabilized by sodium dodecyl sulphate (SDS). The method is shown to have both advantages and disadvantages for emulsions as compared to solid particle dispersions. In particular a “biliquid foam” layer has been shown to form in addition to coalesced and normal “creamed” emulsion. The formation of the biliquid foam, in which water is the continuous phase, though only present to ˜ 0·1 per cent, is shown not to involve passing over any force barrier and is seen rather as a condensation under the influence of attractive forces. The passage from the foamed to coalesced state is shown to be a slow process involving passage over a force barrier of magnitude approximately that expected from electrostatic/van der Waals interactions." @default.
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- W103663583 date "1976-01-01" @default.
- W103663583 modified "2023-10-13" @default.
- W103663583 title "The Centrifuge Technique in the Study of Emulsion Stability" @default.
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- W103663583 doi "https://doi.org/10.1016/b978-0-12-651250-2.50009-0" @default.
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