De-mixing of polydisperse fluids: experimental test of a universal relation
Colloids, emulsions, polymer blends, and other important complex fluids, are 'polydisperse', i.e. there are variations among their constituent particles. Polydispersity is usually regarded as an ubiquitous, uncontrollable nuisance causing experimental inconsistencies. We have varied the po...
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| Veröffentlicht in: | Colloid and polymer science 2004-05, Vol.282 (7), p.766-769 |
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| container_title | Colloid and polymer science |
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| creator | FAIRHURST, D. J EVANS, R. M. L |
| description | Colloids, emulsions, polymer blends, and other important complex fluids, are 'polydisperse', i.e. there are variations among their constituent particles. Polydispersity is usually regarded as an ubiquitous, uncontrollable nuisance causing experimental inconsistencies. We have varied the polydispersity of a complex fluid, whilst keeping all other parameters constant, and report the first measurements of some universal physics. At coexistence (e.g. between liquid and vapour), fractionation occurs--each phase receives a different mix of the various ingredients, e.g. with the liquid disproportionately abundant with larger particles. Theory predicts, at low polydispersity, that this de-mixing becomes universal, irrespective of the material, with chemical differences between the phases proportional to polydispersity to the power two. We have studied colloid-polymer suspensions at two-phase coexistence and, using light scattering, measured the exponent as 2.16±0.44.[PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1007/s00396-003-1019-6 |
| format | Article |
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Theory predicts, at low polydispersity, that this de-mixing becomes universal, irrespective of the material, with chemical differences between the phases proportional to polydispersity to the power two. 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| language | eng |
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| source | SpringerNature Journals |
| subjects | Applied sciences Colloids Exact sciences and technology Fluid dynamics Fluid flow Fluids Fractionation Liquids Organic polymers Physicochemistry of polymers Polydispersity Polymer blends Properties and characterization Solution and gel properties Vapour |
| title | De-mixing of polydisperse fluids: experimental test of a universal relation |
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