Density profiles of colloidal suspensions in equilibrium inside slit pores
作者:
Guillermo Rodríguez,
Luis Vicente,
期刊:
Molecular Physics
(Taylor Available online 1996)
卷期:
Volume 87,
issue 1
页码: 213-226
ISSN:0026-8976
年代: 1996
DOI:10.1080/00268979600100121
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The problem of sedimentation equilibrium is treated within the integral equation formalism of inhomogeneous fluids using the Ornstein-Zernike approach, and using the Percus-Yevick closure, to describe sterically stabilized and charged colloidal suspensions contained in pores of different size. The calculated density profiles exhibit pronounced oscillations near the bottom, showing layering, and, for large pores, a non-oscillatory tail, in agreement with Monte Carlo simulations. For small pores, the particle distribution includes the appearance of layers for small separations. In the case of bidispersions, the computation shows that for large pores there is non-monotonic behaviour by one of the components, owing to competition between excluded volume and gravity. A similar effect is shown in monocomponent systems if the particles interact via a Yukawa-type potential.
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