Fiber-shaped H-aggregates with lengths of up to 300 microm are synthesized by self-assembly of thiacyanine (TC) dye molecules in solution. Photoluminescence (PL) images and spatially resolved PL spectra of the fibers that are transferred onto a glass substrate reveal that the fibers act as single-mode optical waveguides that propagate PL in the range of 520 to 560 nm over 250 microm without any loss.
We report propagation of exciton polaritons (EPs) in photoexcited nanofibers of thiacyanine dye over a few hundred micrometers at room temperature. We determine the complex refractive index along the nanofibers by fluorescence microscopy measurements on single nanofibers and observe its anomalous behavior due to the EP effect. The longitudinal-transverse splitting energy (ΔE(L-T)) is evaluated to be ∼1 eV. The large ΔE(L-T) and waveguide function of the nanofibers allow a millimeter propagation of EPs at room temperature, which is hardly realized in other systems.
Spontane Vesikelbildung sowohl in organischen Lösungsmitteln als auch in Wasser wurde bei Stab‐Knäuel‐Diblockcopolymeren mit Thiophen‐Einheiten beobachtet. Die Thiophen‐Einheiten an der Oberfläche der Aggregate können unter Bildung „polymerisierter“ Vesikel verknüpft werden (siehe Bild und Titelbild). In die Vesikel können Enzyme eingeschlossen werden, wodurch katalytisch aktive Mikroreaktoren erhalten werden, deren Hülle für Substratmoleküle durchlässig ist.
Spontaneous formation of vesicles in both organic solvents and water is observed for new rod–coil‐type diblock copolymers containing thiophene groups. The thiophene groups located in the skin of the aggregates can couple to give polymerized vesicles (see picture and cover picture). The vesicles are capable of including enzymes, which results in catalytically active microreactors that are permeable to substrate molecules.
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