Directing Polymorphism in the Helical Nanofilament Phase

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.

Automated summary

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.