Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: POSTERS Dynamics and Diffusion

CPP 15.8: Poster

Tuesday, March 24, 2009, 14:00–16:30, P3

Brownian Motion of Colloid Particles in Thin Liquid Films — •Ines Trenkmann, Jörg Schuster, and Christian von Borczyskowski — Chemnitz University of Technology, Institute of Physics, 09107 Chemnitz

The growing field of micro- and nanofluids requires an understanding of the role of solid liquid interactions in hydrodynamics.

It is well-known since some years that thin liquid films form layering structures near smooth surfaces and free interfaces [1]. Thereby it is apparent that the dynamical properties of this films differ from those of bulk liquids. Besides the alterated film structure, interfaces enter into the hydrodynamics via the hydrodynamic boundary conditions (HBC). To investigate the alteration of the hydrodynamical features of the liquid films by reduction of the film thickness single-particle tracking is an sensitive method to observe chances in the individual diffusion motion of tracers [2].

We want to show recent measurements of the influence of film thickness on the diffusion behavior of colloid particles as tracers in thin films of a silicon grease. By variation of the tracer size or film thickness the influence of the HBC will be studied down to molecular thin films [3].

[1] G. Evmenenko, et al.: Langmuir 17(2001) 4021

[2] J. Schuster, et al.: Eur. Polymer J. 40(2004) 993

[3] M. J. Saxton: Biophy J.72 (1997) 1744