Berlin 2008 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 26: Micro and Nano Fluidics I: Liquids at structured materials

CPP 26.5: Talk

Wednesday, February 27, 2008, 15:15–15:30, C 264

Phase behavior of fluids between thermally corrugated walls — •Gerrit Günther and Martin Schoen — Stranski-Laboratorium für Physikalische und Theoretische Chemie, Sekreteriat C7, Technische Universität Berlin, Straße des 17. Juni 115, D-10623 Berlin, Germany

To investigate the effect of flexible walls on the phase behavior of confined fluids we use the grand canonical ensemble Monte Carlo method (GCEMC). Consider a Lennard-Jones(12,6) fluid between two plane parallel walls which itself consist of single wall particles in a face centered cubic (fcc) (100) order. Wall and fluid particles are of the same type thus interacting via Lennard-Jones(12,6) potenials as well. The wall particles are not fixed to their lattice sites but bound to them by harmonic potentials. The softness of the wall is controlled via the force constant of this harmonic potential. Starting with a sufficiently high force constant the wall resembles a rigid fcc structure. By softening the wall its particles are able to react to thermal fluctuations in the fluid to a greater extent. Fluid and wall particles are then more evenly distributed in space. The structural changes lead to a shift of phase transition in confinement.