Issue |
Europhys. Lett.
Volume 53, Number 2, January 2001
|
|
---|---|---|
Page(s) | 271 - 277 | |
Section | Interdisciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i2001-00148-y | |
Published online | 01 December 2003 |
The depletion potential in non-additive hard-sphere mixtures
H. H. Wills Physics Laboratory, University of Bristol -
Bristol BS8 1TL, UK
Received:
8
September
2000
Accepted:
14
November
2000
We show that the density functional treatment (DFT) developed for additive hard-sphere mixtures can be employed directly to determine the depletion potential in mixtures where the diameters are non-additive. This enables us to calculate, within the same theoretical framework, depletion potentials for models which range from additive hard-spheres to the extreme non-additive Asakura-Oosawa model of colloid-ideal polymer mixtures. We find that for intermediate degrees of non-additivity the depletion potential between two big spheres, at a fixed density of small spheres, can be more attractive (as measured by the second virial coefficient B2) than in the Asakura-Oosawa limit.
PACS: 82.70.Dd – Colloids / 61.20.Gy – Theory and models of liquid structure
© EDP Sciences, 2001
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