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Fakultät für Biologie, Chemie und Geowissenschaften

Makromolekulare Chemie I: Prof. Hans-Werner Schmidt

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Wolfer, P.; Kreger, K.; Schmidt, H.-W.; Stingelin, N.; Smith, P.: Photo-Oriented Trisazobenzene Layers for Patterned Liquid-Crystal Alignment, Molecular Crystals Liquid Crystals, 562, 133-140 (2012) -- DOI: 10.1080/15421406.2012.674857
Photosensitive trisazobenzene-based layers, after irradiation with polarized light, are employed to align the common liquid-crystal (LC) compound 4-cyano-4′-heptylbiphenyl (7CB) into predetermined patterns. Surface analysis of the trisazobenzene films indicate that ordering of the LC material is not caused by illumination-induced surface relief structures, but through “molecular mesoepitaxial” phenomena. This finding can be exploited to produce in one-step in-plane patterns of randomly oriented and ordered macroscopic LC domains by irradiation of the substrates.
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