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Issue 37, 2010
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Optical detection of heterogeneous single molecule diffusion in thin liquid crystal films

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Abstract

Lateral diffusion of three different dye molecules (terrylene and two perylene diimides) in 4 to 225 nm thin films of 8CB liquid crystals in the smectic-A phase has been investigated on a single molecule level. The influence of film thickness on tracer diffusion can be qualitatively modeled by a hydrodynamic approach. Molecular tracking experiments as well as fluorescence correlation (FCS) studies reveal the presence of diffusion dynamics which span a range of at least more than one order of magnitude in time, which is much larger than the reported anisotropic self-diffusion observed for 8CB bulk samples. We tentatively assign the heterogeneity to the formation of diffusion limiting domains on a micrometer scale within the 8CB films or at the interfaces.

Graphical abstract: Optical detection of heterogeneous single molecule diffusion in thin liquid crystal films

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Publication details

The article was received on 09 Mar 2010, accepted on 10 Jun 2010 and first published on 02 Aug 2010


Article type: Paper
DOI: 10.1039/C004042H
Citation: Phys. Chem. Chem. Phys., 2010,12, 11555-11564
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    Optical detection of heterogeneous single molecule diffusion in thin liquid crystal films

    B. Schulz, D. Täuber, F. Friedriszik, H. Graaf, J. Schuster and C. V. Borczyskowski, Phys. Chem. Chem. Phys., 2010, 12, 11555
    DOI: 10.1039/C004042H

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