Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Interfaces and Thin Films

CPP 13.15: Poster

Dienstag, 27. März 2012, 18:15–20:45, Poster A

Evidence of elastic behaviour of a distorted monolayer — •Uli Langer and Thomas M. Fischer — Uni Bayreuth, Bayreuth, Germany

In our experiment we spread carboxilic particles with a diameter of 100 nm at the air/water interface where they form a monolayer with two phases. Adding nickel nanowires we can excess a shear force by using an external static magnetic field. The nanowires reorient when the external field is switched between x- and y-direction. Located in the denser phase they deform the nearby domains of the less dense phase. While most of the domains start relaxing immediately after the torque was applied some keep their distorted shape until the nanowires are flipped back to their original position.

We computed several physical properties of the monolayer including the line tension λ between the phases, the viscosity η of the denser phase, the pressure difference Δπ between the two phases, and the force density profile acting on a distorted domain.