Depletion and ''fines'' effects on transport in hard-sphere colloids

Leo Lue, Leslie V. Woodcock

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The effect of depletion forces induced by the presence of much smaller B spheres (diameter ratio 10/1) in dense hard A spheres has been investigated. Simulations for systems of 10(4) spheres with mole fraction of larger spheres x(A) = 0.05 and with total sphere volume fraction from 0.35 to 0.655 have been carried out. The depletion force steeply increases in the A-A pair distribution function at contact, and creates a lower first coordination and more open network A-structures. There is no evidence of demixing. It is found that in the amorphous solid region there is an enhanced diffusive mobility of the larger spheres, relative to that of pure spheres, at the same densification rates. This observation resembles the "fines" effect that occurs in colloidal suspensions and granular fluids.
LanguageEnglish
Pages937-947
Number of pages11
JournalInternational Journal of Thermophysics
Volume23
Issue number4
DOIs
Publication statusPublished - Jul 2002

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fines
colloids
depletion
densification
distribution functions
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Keywords

  • hard-sphere colloids
  • depletion forces
  • fines effect
  • computer simulation

Cite this

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abstract = "The effect of depletion forces induced by the presence of much smaller B spheres (diameter ratio 10/1) in dense hard A spheres has been investigated. Simulations for systems of 10(4) spheres with mole fraction of larger spheres x(A) = 0.05 and with total sphere volume fraction from 0.35 to 0.655 have been carried out. The depletion force steeply increases in the A-A pair distribution function at contact, and creates a lower first coordination and more open network A-structures. There is no evidence of demixing. It is found that in the amorphous solid region there is an enhanced diffusive mobility of the larger spheres, relative to that of pure spheres, at the same densification rates. This observation resembles the {"}fines{"} effect that occurs in colloidal suspensions and granular fluids.",
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Depletion and ''fines'' effects on transport in hard-sphere colloids. / Lue, Leo; Woodcock, Leslie V.

In: International Journal of Thermophysics, Vol. 23, No. 4, 07.2002, p. 937-947.

Research output: Contribution to journalArticle

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AU - Lue, Leo

AU - Woodcock, Leslie V.

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AB - The effect of depletion forces induced by the presence of much smaller B spheres (diameter ratio 10/1) in dense hard A spheres has been investigated. Simulations for systems of 10(4) spheres with mole fraction of larger spheres x(A) = 0.05 and with total sphere volume fraction from 0.35 to 0.655 have been carried out. The depletion force steeply increases in the A-A pair distribution function at contact, and creates a lower first coordination and more open network A-structures. There is no evidence of demixing. It is found that in the amorphous solid region there is an enhanced diffusive mobility of the larger spheres, relative to that of pure spheres, at the same densification rates. This observation resembles the "fines" effect that occurs in colloidal suspensions and granular fluids.

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KW - depletion forces

KW - fines effect

KW - computer simulation

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