Anita Trajkovska

Liquid Crystalline Oligofluorenes

Chiroptical Properties and Photoalignment

• Broschiertes Buch

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.

Produktdetails

• Verlag: VDM Verlag Dr. Müller / VDM Verlag Dr. Müller e.K.
• Seitenzahl: 184
• Englisch
• Abmessung: 11mm x 150mm x 220mm
• Gewicht: 290g
• ISBN-13: 9783639070965
• ISBN-10: 3639070968
• Artikelnr.: 24848304

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.