Perylenebis(dicarboximide)-based Chromonic Mesogens for the Fabrication of Micro- and Nanopatterned Materials
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Authors
Mahinay, Delfin, Jr. G.
Issue Date
2010
Type
Thesis
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Keywords
chromonic mesogen , liquid crystal , micropatterned material , nanopatterned material , perylenebis(dicarboximide) , perylenediimide
Alternative Title
Abstract
Bis(ammoniumethyl)perylene-3,4:9,10-tetracarboxylic diimide trifluoro acetate, 1 was
synthesized and its properties in dilute aqueous solutions were studied by UV-Vis and
fluorescence spectroscopy. The studies showed H-aggregation, which can be affected by
the concentration of the solution, solvent used, and temperature. At higher concentration
(≥ 9 wt%) the solution of 1 showed chromonic liquid-crystalline properties which were
examined by polarized light microscopy and 2H NMR spectroscopy. These properties
were compared to previously studied perylenediimides for their structural effects.
Template-guided organization of the chromonic mesogen was employed in the
fabrication of micropatterns which showed dichroic properties. A complex pattern that
resulted when two 2-µm patterns were overlapped perpendicularly has potential
applications in 3D and holographic films. Nanolines of 100 nm in width were also
generated from the soft lithography technique and analyzed by scanning electron
microscopy. This fabricated pattern with nanoline features has potential applications as
semiconducting and photoconducting nanowires in electronic devices.
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