4.6 Article

Directing Polymorphism in the Helical Nanofilament Phase

Journal

CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 24, Pages 7108-7113

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202005221

Keywords

helical structures; liquid crystals; nanoconfinement; photoalignment; polymorphism

Funding

  1. National Research Foundation (NRF) - Korean Government (MSIT) [2018R1A5A1025208, 2017R1E1A1A01072798]
  2. National Science Centre (Poland) [2016/22/A/ST5/00319]
  3. MSIT
  4. Pohang University of Science and Technology

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The polymorphism in the helical nanofilament (HNF, B-4) liquid-crystalline phase depends on the fabrication methods, such as UV-driven formation and template-assisted self-assembly in the nanoconfined geometry. Different helical structures were obtained, including twisted-ribbon and cylindrical-ribbon polymorphs, showing the capability for fine control of the helical structures for potential chiro-optical applications. SEM and grazing-incidence X-ray diffraction with synchrotron radiation were used to directly observe the detailed structures.
Herein, it is reported that the polymorphism in the helical nanofilament (HNF, B-4) 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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