title: Ordering of amphiphilic Janus particles at planar walls: a density functional study.
abstract: We investigate the structure formation of amphiphilic molecules at planar walls using density functional theory. The molecules are modeled as (hard) spheres composed of a hydrophilic and hydrophobic part. The orientation of the resulting Janus particles is described as a vector representing an internal degree of freedom. Our density functional approach involves fundamental measure theory combined with a mean-field approximation for the anisotropic interaction. Considering neutral, hydrophilic, and hydrophobic walls, we study the adsorption of the particles, focusing on the competition between the surface field and the interaction-induced ordering phenomena. Finally, we consider systems confined between two planar walls. It is shown that the anisotropic Janus interaction yields pronounced frustration effects at low temperatures.
authors.affiliation: Institut für Theoretische Physik, Fakultät II, Technische Universität Berlin, Berlin, Germany. rosenthal@itp.physik.tu-berlin.de
authors.forename: Gerald
authors.initials: G
authors.lastname: Rosenthal
authors.forename: Sabine H L
authors.initials: SH
authors.lastname: Klapp