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Directing Polymorphism in the Helical Nanofilament Phase.

Wongi Park1, Minyong Yang1, Hyewon Park2

  • 1Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 19, 2021
PubMed
Summary
This summary is machine-generated.

Fabrication methods control helical nanofilament (HNF) liquid-crystal polymorphism. Different methods yield unique HNF structures, enabling fine-tuning for chiro-optical applications.

Keywords:
helical structuresliquid crystalsnanoconfinementphotoalignmentpolymorphism

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Area of Science:

  • Materials Science
  • Liquid Crystals
  • Nanotechnology

Background:

  • Polymorphism in helical nanofilaments (HNFs) is crucial for their properties.
  • Understanding HNF structure-property relationships is key for advanced materials.

Purpose of the Study:

  • To investigate how fabrication methods influence the polymorphism of helical nanofilaments (HNFs).
  • To explore the potential of controlled HNF structures in chiro-optical applications.

Main Methods:

  • UV-driven formation of HNFs.
  • Template-assisted self-assembly in nanoconfined geometries.
  • Scanning Electron Microscopy (SEM) for structural observation.
  • Grazing-incidence X-ray diffraction (GIXRD) with synchrotron radiation for detailed lattice analysis.

Main Results:

  • Fabrication methods dictate the specific polymorphs (e.g., twisted-ribbon, cylindrical-ribbon) of HNFs obtained.
  • Uniaxially oriented HNFs with distinct helical structures were successfully produced.
  • Demonstrated control over molecular lattice orientation within different HNF polymorphs.
  • SEM and GIXRD confirmed the detailed structures and orientations.

Conclusions:

  • The fabrication method is a critical determinant of HNF liquid-crystalline phase polymorphism.
  • Precisely controlled helical structures in HNFs open avenues for advanced chiro-optical applications.