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Issue 5, 2011
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Single molecule fluorescence microscopy investigations on heterogeneity of translational diffusion in thin polymer films

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Abstract

Translational diffusion of single perylene diimide molecules in 25 nm thin polymer films was investigated by single molecule widefield fluorescence microscopy. Spatial heterogeneities in single molecule motion were detected and analyzed by a new, quantitative method which draws a comparison of log-Gaussian fits of experimentally determined diffusion coefficient-distributions and diffusion coefficient-distributions from Monte Carlo random walk simulations. Heterogeneities could be observed close to the glass transition temperature, but disappear at ca. 1.1 × Tg. At higher temperatures, heterogeneities do not exist or they average out on the time and length scales of observation. The observed heterogeneities also explain why the dependency of diffusion coefficients on temperature does not follow Vogel–Fulcher–Tammann behavior.

Graphical abstract: Single molecule fluorescence microscopy investigations on heterogeneity of translational diffusion in thin polymer films

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Publication details

The article was received on 13 Sep 2010, accepted on 16 Nov 2010 and first published on 10 Dec 2010


Article type: Paper
DOI: 10.1039/C0CP01801E
Citation: Phys. Chem. Chem. Phys., 2011,13, 1770-1775
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    Single molecule fluorescence microscopy investigations on heterogeneity of translational diffusion in thin polymer films

    B. M. I. Flier, M. Baier, J. Huber, K. Müllen, S. Mecking, A. Zumbusch and D. Wöll, Phys. Chem. Chem. Phys., 2011, 13, 1770
    DOI: 10.1039/C0CP01801E

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