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Diffusion and Trapping in Confined Liquid Films and at Interfaces |
Funded within the
Saxon research unit 877 "From Local Constraints to Macroscopic Transport"
Subproject P4 "Diffusion and Trapping in Confined Liquid Films and at Interfaces"
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| Project Leader: Prof. Dr. Günter Radons |
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Experimentally observed diffusion is only seen as a two-dimensional projection from a
basically three-dimensional space.
Composite Markov processes which are supposed to be able to explain these basic experimental results
yield predictions about typical time and length scales. These are compared to the experiment, where
for layering systems the diffusion coefficients depend on the observed time or space window.
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Simulation of a 2-layer process showing diffusion within the layers
(with nonidentical diffusion coefficients)
and random jumps between the layers.
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Furthermore the evaluation of the range of applicability of composite Markov processes is investigated.
For thin liquid films we expect to get sensible results for the diffusion coefficients
and transition rates of the real system. For thicker liquid films the simple approach
with discrete layers is supposed to fail for the layers farthest away from the solid interface,
where a transition to bulk diffusion is expected.
Thus, a full three-dimensional continuum model using a 3-d Fokker-Planck equation
for the stochastic motion is more appropriate.
In cooperation with the group
Optical Spectroscopy and Molecular Physics previously hidden details are extracted
from experiments to develop an optimized analysis scheme for optical single molecule tracking data.
This should help to separate effects of the diffusant/liquid and the diffusant/substrate
interactions.
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