Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 5: Interfaces

CPP 5.1: Vortrag

Montag, 23. März 2009, 10:30–10:45, ZEU 160

Tracing physio-chemical changes at the solid liquid interface with single molecule microscopy. — •Täuber Daniela, Schuster Jörg, and von Borczyskowski Christian — TU-Chemnitz, Institut für Physik, 09107 Chemnitz, and FOR 877

Hydrodynamics at the solid-liquid interfaces are subject of recent studies in experiment and simulations. Scaling down to nanoscience X-ray and other investigations revealed structural ordering of liquids close to interfaces. However on the molecular level there are still open questions which interactions with the solid interface are accountable for dynamic and structural effects. In previous single molecule tracking experiments [1] we were able to show that diffusion within ultrathin liquid films is vertically heterogeneous and drastically slowed down in comparison to the bulk behavior. Furthermore it is characterized by adsorption events interrupting the diffusional motion.

In series of recent experiments we focussed on details of molecular interactions. By the use of charged and neutral dyes we could reveal spontaneously occurring physio-chemical changes at the solid liquid interface within days leading to a decrease in adsorption probability and thus enhancement of dye diffusion. A simple surface chemistry model is presented to explain those observations.

[1] J. Schuster, F. Cichos, Ch. von Borczyskowski: Euro. Phys. J. E. 12 (2003), 75-80