Transcription of Emulsion Stability and Testing - particlesciences.com
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Emulsion Stability and Testing - particlesciences.com
2011 Particle Sciences, Inc. All rights rate of < 1 mm per day is considered can be generally de-fined as the aggregation of drop-lets to give 3-D clusters without coalescence occurring. Impor-tantly, all droplets maintain their own integrity and remain as totally separate entities. It results when there is a weak, net attraction be-tween droplets and arises through various mechanisms3-5 the discus-sion of which is beyond the scope of this Technical Brief. Flocculation may be subdivided for convenience into two general categories: that resulting from sedimentation aggregation and that from Brownian motion aggre-gation of the droplets. In polydis-perse ( real ) emulsions, droplets of different size cream at different rates and this leads to a tendency for the faster-moving (larger) drop-lets to collide with and potentially trap, slower moving smaller drop-lets.
phase volume, the greater its rela-tive vapor pressure (and thus the solubility) will be, as given by the Kelvin equation: ln [P o / P] = 2γ V m
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