Self-assembly of amphiphilic Janus particles at planar walls: A density functional study

Details Self-assembly of amphiphilic Janus particles at planar walls: A density functional study Self-assembly of amphiphilic Janus particles at planar walls: A density functional study

2010-12-06

arxiv.org/abs/1012.1127v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages

Scientific paper

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, focussing on the competition between the surface field and interact ion-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.

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