Dresden 2014 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 36: Brownian Motion and Transport

DY 36.8: Vortrag

Donnerstag, 3. April 2014, 17:00–17:15, ZEU 160

Advanced data analysis by the distribution of diffusivities — •Michael Bauer and Günter Radons — Technische Universität Chemnitz, Germany

Single-particle tracking (SPT) provides a useful approach to observe individual tracers and characterize transport processes in physical and biological systems. However, an analysis based on well-established quantities, such as mean squared displacements (msd), often obscures the interesting properties of complex systems. To improve the interpretation of SPT experiments we introduced the distribution of diffusivities. We demonstrated its applicability to heterogeneous diffusion in a two-layer system and showed its relation to ensemble-based methods such as pulsed field gradient nuclear magnetic resonance (PFG NMR) [1]. Furthermore, we analyzed processes with direction-dependent diffusion coefficients [2], which are of great interest for anisotropic diffusion, e.g., of elongated molecules or in porous media. Additionally, our new method was extended to the distribution of generalized diffusivities to characterize data from anomalous diffusion processes [3]. In our contribution we will explain the properties and features of the distribution of diffusivities. We apply our method to different systems and show the advantages over conventional analysis methods.

[1]  M. Bauer et al., J. Chem. Phys. 135, 144118 (2011)

[2]  M. Heidernätsch et al., J. Chem. Phys. 139, 184105 (2013)

[3]  T. Albers and G. Radons, EPL 102, 40006 (2013)