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• W2280787888 abstract "The thesis focuses on the solvation dynamics at the interfaces of two representative biological model systems. A synthetic phospholipid membrane interface serves as a model for biological membranes. In such environments, the time-dependent fluorescence Stokes-shift of the dye laurdan is used to determine the dynamics of the solvation. Time-correlated single photon counting technique is used to characterize the structural relaxations on a nanosecond time-scale. By means of anisotropy measurements, it is shown that solvation on these time-scales is dominated by the diffusive motion of the chromophore in its restricted environment. To investigate the ultrafast components, a fluorescence up-conversion experiment is built to enable measurements in the sub-picosecond regime. On these time-scales, ultrafast components play a role which can presumably be assigned to solvation through water molecules in the head group region of the lipid-bilayers. However, the dynamics appear to be significantly slower than in the bulk water phase. The second system under investigation is reverse micelles. They are perfectly suited to systematically examine restricted water environments because it is possible to vary the grade of restriction through the size of the water-pool of the reverse micelles. The solvation dynamics is determined by using an indocarbocyanine dye dissolved in the water inclusion of the reverse micelles. For the first time, photon-echo spectroscopy is used in such a system to elucidate the underlying ultrafast dynamics on a femtosecond time-scale. Complementary investigations on the same chromophore in bulk water enable the classification of the dynamics in the water nano-droplets. The inclusion of the chromophore in the water pools of the reverse micelles does not show a significant alteration of the underlying solvation dynamics. In other words, the characteristic structural relaxation modes of bulk water determine the solvation in the water-pool of reverse micelles. An increase in the grade of restriction through reduction of the micelle size shows surprisingly little effect on the underlying solvation dynamics." @default.
• W2280787888 created "2016-06-24" @default.
• W2280787888 creator A5075389241 @default.
• W2280787888 date "2003-12-10" @default.
• W2280787888 modified "2023-09-27" @default.
• W2280787888 title "Solvatationsdynamik an biologischen Grenzschichten" @default.
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