Directing Polymorphism in the Helical Nanofilament Phase |
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| Authors: | Wongi Park Minyong Yang Hyewon Park Dr. Joanna M. Wolska Dr. Hyungju Ahn Prof. Dr. Tae Joo Shin Prof. Dr. Damian Pociecha Prof. Dr. Ewa Gorecka Prof. Dr. Dong Ki Yoon |
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| Affiliation: | 1. Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology, Daejeon, 34141 Republic of Korea;2. Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon, 34141 Republic of Korea;3. Faculty of Chemistry, University of Warsaw, Warsaw, 02-089 Poland;4. Pohang Accelerator Laboratory, POSTECH, Pohang, 37673 Republic of Korea;5. UNIST Central Research Facilities & School of Natural Science, UNIST, Ulsan, 44919 Republic of Korea |
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| Abstract: | Herein, it is reported that the polymorphism in the helical nanofilament (HNF, B4) liquid-crystalline phase depends on the fabrication methods, that is, UV-driven formation and template-assisted self-assembly in the nanoconfined geometry. As a result, uniaxially oriented HNFs with different helical structures were obtained, in which generation of the twisted-ribbon and cylindrical-ribbon polymorphs showed that even the molecular lattice has a different orientation. The detailed structures were directly observed by SEM and grazing-incidence X-ray diffraction with synchrotron radiation. The resultant polymorphs could be used in chiro-optical applications due to the capability for fine control of the helical structures. |
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| Keywords: | helical structures liquid crystals nanoconfinement photoalignment polymorphism |
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