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