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TU Berlin

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1991 - 2000

A realistic diffusion model for ultrathin polyelectrolyte films
Citation key klit96a
Author von Klitzing, R. and Möhwald, H.
Pages 6901–6906
Year 1996
Journal Macromolecules
Volume 29
Number 21
Abstract In order to obtain information on transport processes in ultrathin films of polyelectrolytes, we studied the time dependence of the fluorescence of a dye (FITC) attached to a polymer and embedded in a defined, variable depth inside the film by total internal reflection fluorescence (TIRF) spectroscopy. Adding a rhodamine solution to the outer aqueous phase, we observe FITC quenching due to energy transfer and from this determine surface concentration and permeability of rhodamine. We derive a diffusion coefficient on the order of 10(-15) cm(2)/s. This value can be manipulated by changing the film structure. So, the diffusion coefficient varies by nearly 2 orders of magnitude going along the surface normal. Studying the paramagnetic quenching by the smaller spin label TEMPOL, we observe that the diffusion coefficient is more than a factor of 200 larger for this molecule.
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