Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Colloids and Complex Liquids I - Structure
CPP 25.7: Vortrag
Mittwoch, 16. März 2011, 12:15–12:30, ZEU 222
Excluded Volume Effects in the Depletion Attraction between Nanoparticles — •Maryam Naderian1,2, Matthias Fuchs2, and Michel Rawiso3 — 1Institut für Elektrochemie, Universität Ulm, Germany — 2Universität Konstanz, Germany — 3Institut Charles Sadron, Strasbourg, France
We study the correlation functions and the interparticle interactions of mixtures of nonadsorbing real polymers and colloidal particles in both nanoparticle and colloid limits employing extensive numerical calculations within the framework of an integral equation method (PRISM) [1]. In our theoretical model colloidal particles considered as hard spheres and polymers are described using a form factor from Edwards-Flory mean field theory capturing self avoiding walk correlations.
Keeping the colloidal particle volume fraction low and varying the polymer concentration from infinitely dilute to semidilute we investigated the effect of the excluded volume interaction between the polymer monomers on the depletion layer and the induced interaction between the particles. Using numerical solutions of the PRISM-mPY equations the thermodynamic consistency is achieved, the radial distribution functions and second virial coefficient among the colloidal particles are investigated. At the end our theoretical predictions are compared with the existing results from the field theoretical approach [2] and the experimental data.
[1] K.S. Schweizer and J.G. Curro. Adv. Polym. Sci., 116:319, 1994.
[2] E. Eisenriegler. Field Theory of polymer Interactions. WILEY-VCH Verlag Berlin GmbH, 2005.