| Distinguishing the parallel and vertical orientations and optic axis characteristics determination of azobenzene mesogen by conoscopic polarized microscopy. | |
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MedLine Citation:
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PMID: 21910731 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Orientational behaviours under the action of linearly polarized light and circularly polarized light of a side-chain azobenzene containing polymer were studied by conoscopic polarized microscopy. The results suggest that the linearly polarized light (473 nm, 20 mW cm(-2) ) results in an in-plane orientation of the azobenzene groups. The irradiation with circularly polarized light (473 nm, 20 mW cm(-2) ) leads to a tilt orientation (out-of-plane) of the azobenzene groups with the long axis of mesogens aligned along the propagation direction of the actinic light. Characteristic features of the in-plane and out-of-plane orientated films were obtained from their interference figures. The in-plane orientated film shows an interference cross consisting of a broad fuzzy bar, and the cross-centre lies in the centre of view field. In-plane orientated film also yields a flash figure upon a less than 10° rotation of the sample under polarized microscopy. The interference figures yielded from the out-of-plane orientated films consist of narrow bar cross. The locations of those interference figures depend on the oblique angle of the irradiation light. A method for distinguishing the in-plane orientation of the mesogens from the vertically out-of-plane orientation is demonstrated, which is based on comparing the bar width of their interference figures, and by whether they can produce a flash figure upon a small angle rotation of the film. The liquid crystalline film is identified as positive and uniaxial anisotropy after annealing of the perpendicularly irradiated film. |
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Authors:
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J Liu; M Wang; M Dong; L Gao; J Tian |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-9-13 |
Journal Detail:
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Title: Journal of microscopy Volume: - ISSN: 1365-2818 ISO Abbreviation: - Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-9-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0204522 Medline TA: J Microsc Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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© 2011 The Authors Journal of Microscopy © 2011 Royal Microscopical Society. |
Affiliation:
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State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang, China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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