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Diffusion Separation of Fullerenes in Solution

Published online by Cambridge University Press:  15 February 2011

Alexander V. Eletskii,
Michael V. Okun and
Eugene V. Stepanov
Alexander V. Eletskii
Affiliation:
Russian Research Center “Kurchatov Institute”, Kurchatov Sq. 1, Moscow 123182, Russia
Michael V. Okun
Affiliation:
Russian Research Center “Kurchatov Institute”, Kurchatov Sq. 1, Moscow 123182, Russia
Eugene V. Stepanov
Affiliation:
Russian Research Center “Kurchatov Institute”, Kurchatov Sq. 1, Moscow 123182, Russia
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Abstract

The diffusion of fullerenes in solution is studied taking into account the recently established fact of the formation of clusters containing some number of aggregated fullerene molecules. Based on a droplet model of a cluster, the distribution function of fullerene clusters by size is obtained for various concentrations of solution. It is shown that dissolved fullerene is present mainly in the form of clusters at saturation conditions, but the contribution of clusters decreases as concentration drops down. Since the diffusion mobility of clusters is much less than that of molecules, it leads to the dependence of an effective diffusion coefficient on concentration, which is computed for the case of fullerene C60. The feasibility of the use of this dependence as a basis for a diffusion method of the separation and enrichment of the fullerene extract with a small addition of higher fullerenes is analyzed. Possible schemes for enrichment are discussed.

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References

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