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Macroscopically aligned films of discotic phthalocyanine by zone casting

A Tracz1, T Makowski1, S Masirek1, W Pisula2,4 and Y H Geerts3

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This work describes a room temperature liquid crystalline phthalocyanine processed by using zone casting. Highly oriented films that were uniform over several square centimeters were obtained on glass support from a mixed solvent (1:1 mixture of toluene and ethylene chloride) solution. A columnar planar alignment of Colr in the film layers has been determined by optical polarized microscopy, ultraviolet–visible absorption, atomic force microscopy and x-ray diffraction studies. The films consist of uniaxially oriented ribbon-like structures with molecular columns perpendicular to the solidification direction. The pronounced alignment makes these thin films promising for application in optoelectronic devices.


PACS

61.30.-v Liquid crystals

68.15.+e Liquid thin films

78.40.Dw Liquids

78.66.Qn Polymers; organic compounds

64.70.M- Transitions in liquid crystals

Subjects

Soft matter, liquids and polymers

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Dates

Issue 48 (5 December 2007)

Received 17 July 2007, in final form 2 October 2007

Published 30 October 2007



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