Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Poster: Interfaces and Thin Films

CPP 19.10: Poster

Tuesday, March 15, 2011, 18:00–20:00, P2

A new method to characterize surface texture via observation of single molecules in video microscopy — •Mario Heidernätsch and Günter Radons — Chemnitz University of Technology, D-09126 Chemnitz, Germany

Single molecule video microscopy is a widely used tool to investigate the dynamic properties of thin liquid films. By analyzing the distribution of diffusivities [1], i.e. the local displacements obtained from the trajectories of the observed dyes, the influence of local inhomogeneities on the diffusion can be revealed. Especially in ultra-thin liquid films the local surface texture strongly influences the diffusivities, thus the resulting diffusion coefficient becomes spatial dependent. We present a new method, the so called diffusion map, which can be easily obtained either from the observed trajectories or, without the necessity of tracking, directly form the recorded videos. We can show that this diffusion map is an indirect representation of the surface texture.

[1] M. Bauer, M. Heidernätsch, D. Täuber, C. von Borczyskowski, G. Radons, Diffusion Fundamentals III 11 (2009), pp. 70.1-70.2