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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Poster: Interfaces and Thin Films

CPP 14.8: Poster

Montag, 22. März 2010, 16:30–18:00, Poster C

Ordering of amphiphilic particles at a hard wall — •Gerald Rosenthal and Sabine H. L. Klapp — Institut für Theoretische Physik, Fak. II, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin

We present a numerical calculation of amphiphilic molecules at a hard wall using density functional theory. We focus on the competition between surface field and interaction-induced ordering phenomena. Amphiphilic molecules (e.g. surfactants, Janus-particles) are composed of hydrophilic and hydrophobic segments. We use an effective coarse-grained model, which describes the ”surfactants” or Janus-particles as hard spheres with a hydrophilic and a hydrophobic side. This anisotropy is realized by a vector as an internal degree of freedom. The coarse-grained model goes back to Tarazona et al. [1]. In our density functional approach we use the White-Bear fundamental measure theory [2] for the hard sphere part and a mean-field approximation for the anisotropic part of the interaction.

[1] A. M. Somoza, E. Chácon, L. Mederos and P. Tarazona, J. Phys.: Condens. Matter Vol. 7, 5753 (1995).

[2] H. Hansen-Goos and R. Roth, J. Phys.: Condens. Matter Vol. 18, 8413 (2006).