Volume 85, Number 3, February 2009
Article Number 36003
Number of page(s) 6
Section Condensed Matter: Structural, Mechanical and Thermal Properties
Published online 13 February 2009
EPL, 85 (2009) 36003
DOI: 10.1209/0295-5075/85/36003

Depletion interaction of two spheres —Full density functional theory vs. morphometric results

M. Oettel1, H. Hansen-Goos2, 3, P. Bryk4 and R. Roth2, 3

1   Institut für Physik, WA 331, Johannes-Gutenberg-Universität Mainz - D-55099 Mainz, Germany, EU
2   Max-Planck-Institut für Metallforschung - Heisenbergstr. 3, 70569 Stuttgart, Germany, EU
3   ITAP, Universität Stuttgart - Pfaffenwaldring 57, 70569 Stuttgart, Germany, EU
4   Department for the Modeling of Physico-Chemical Processes, Maria Curie-Sklodowska University 20-031 Lublin, Poland, EU

received 19 December 2008; accepted in final form 19 January 2009; published February 2009
published online 13 February 2009

Morphological thermodynamics is employed to calculate the depletion potential between two big hard spheres in a solvent of small spheres. Thereby, the potential is characterized solely by the geometric properties of the solvent-accessible surface of the two-sphere configuration in the depletion region. Comparison with explicit density functional theory calculations using accurate functionals of the fundamental measure type shows good agreement.

61.20.-p - Structure of liquids.
82.70.Dd - Colloids.

© EPLA 2009