ISSN:
1435-1536
Keywords:
Sedimentation equilibrium
;
colloidal particles
;
hard spheres
;
finite concentrations
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Equilibrium concentration profiles of non-dilute colloidal suspensions are calculated by means of the Carnahan-Starling expression for the osmotic compressibility of hard sphere liquids. The profiles depend on the average volume fraction of the suspension, 〈ϕ〉, and on the field interaction parameter, λ0 (reciprocal of the Péclet number at infinite dilution). Profiles are computed for values of 〈ϕ〉 and λ0 typical of those encountered in sedimentation field-flow fractionation experiments. It is found that, in most cases, the volume fraction at the depletion wall is negligibly small and that the volume fraction at the accumulation wall φ0, depends on the ratio 〈φ〉0/λ0 only. An inflexion point is found in the concentration profile if φ0 is larger than 0.13 whatever the value of λ0.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00664726
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