We investigate the structure formation of amphiphilic molecules at planarwalls using density functional theory. The molecules are modeled as (hard)spheres composed of a hydrophilic and hydrophobic part. The orientation of theresulting Janus-particles is described as a vector representing an internaldegree of freedom. Our density functional approach involves Fundamental MeasureTheory combined with a mean-field approximation for the anisotropicinteraction. Considering neutral, hydrophilic and hydrophobic walls, we studythe adsorption of the particles, focussing on the competition between thesurface field and interact ion-induced ordering phenomena. Finally, we considersystems confined between two planar walls. It is shown that the anisotropicJanus interaction yields pronounced frustration effects at low temperatures.
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