Liquid Crystalline Oligofluorenes - Trajkovska, Anita
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Monodisperse glassy liquid crystalline conjugatedoligomer films are promising for application inoptics, photonics and electronics. This research hasfurnished fundamental understanding of the origin ofchiroptical effects in glassy-cholestericoligofluorene films and new insight into thephotoalignment of glassy-nematic oligofluorene films.Specifically, cholesteric films, which emerged uponthermal annealing of spin-cast films of chiraloligofluorenes, showed an order-of-magnitude increasein circular dichroism and a handedness reversal incircularly polarized fluorescence compared to theamorphous…mehr

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Produktbeschreibung
Monodisperse glassy liquid crystalline conjugatedoligomer films are promising for application inoptics, photonics and electronics. This research hasfurnished fundamental understanding of the origin ofchiroptical effects in glassy-cholestericoligofluorene films and new insight into thephotoalignment of glassy-nematic oligofluorene films.Specifically, cholesteric films, which emerged uponthermal annealing of spin-cast films of chiraloligofluorenes, showed an order-of-magnitude increasein circular dichroism and a handedness reversal incircularly polarized fluorescence compared to theamorphous pristine films. The oligomer chain lengthplayed an important role in solid morphology. Theorientation of monodisperse glassy-nematicoligofluorenes was characterized on photoalignmentlayers comprising a polymethacrylate backbone withcoumarin pendants. A transition from a parallel to aperpendicular orientation with reference to thepolarization axis of UV-irradiation was observed at ahigh extent of coumarin dimerization. A kinetic modelwas used to interpret the photodimerization ofcoumarin and to evaluate the relative importance ofthe factors affecting the crossover behavior.
Autorenporträt
Trajkovska Anita§PhD and MS in Chemical Engineering, University of Rochester,Rochester, New York; MS in Materials/Polymer Science and BSChemical Engineering, Sts Cyril and Methodius University, Skopje,Macedonia. Her research interests include multi-functionalmaterials for optics and photonics, as well as novel methods forliquid crystal alignment.