The driving force for homeotropic alignment of a triphenylene derivative in a hexagonal columnar mesophase on single substrates |
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Authors: | Junjie Wang Yingning Zhang Huan Zhao Chunxiu Zhang Xiangfei Kong Linping Mu Chunjun Liang |
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Affiliation: | Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, PR China |
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Abstract: | An interesting discotic triphenylene derivative, 2,7-biscarbethoxy-3,6,10,11-tetrapentyloxytriphenylene, can be homeotropically aligned on a large scale as a film on single substrates, i.e. the film with one side on the substrate and the other side freestanding. The alignment is achieved in a controlled condition close to a thermodynamic equilibrium state in a liquid crystal phase when interactions at the substrate surface are limited. Phase changing properties of this material are also a key factor in the alignment processes. The aligned structures are observed with an optical microscope. Within a single domain a hexagonal lattice of a d-spacing 16.3 Å is confirmed by X-ray diffraction measurement. |
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Keywords: | Homeotropic Alignment Discotic Liquid crystal Triphenylene derivative Phase transitions |
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