Journal
NANOMATERIALS
Volume 12, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/nano12040619
Keywords
chromonic liquid crystals; chiral self-assembly; X-ray diffraction; functional materials
Categories
Funding
- [ARS01_00401-DEMETRA]
- [B24I20000080001]
- [J51B19000340005]
- [1875705-2]
- [H24119000450005]
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This study investigates chirality in chromonic liquid crystals by doping with a strong helical-twisting-power peptide and confining in a spherical geometry. The results show that the geometrical constraint and the presence of the chiral dopant enhance the chiral effect, leading to a highly ordered helical superstructure. Additionally, the study demonstrates the potential for creating biocompatible and eco-friendly optical devices for sensor and anticounterfeiting applications.
Induced or spontaneous chirality in natural systems is an intriguing issue. In recent years, a lot of attention has been focused on chirality of chromonic liquid crystals, a class of materials that is able to self-assemble in columnar structures. However, the mechanism involved in the arising of chirality in thesematerials, that starts at the molecular level and controls the supramolecular structure, is poorly understood; however, it is certainly affected by ionic strength. In this work we present the results obtained doping Cromolyn, a chromonic material, with a strong helical-twisting-power peptide, and confining it in a spherical geometry. We demonstrate, by means of optical polarized microscopy and structural analysis, that both the geometrical constraint and the presence of the chiral dopant enhance the chiral effect; we also demonstrate that they favor the rise of a highly ordered helical superstructure, that may be optimized upon adding an ionic dye to the system. Finally, we report a procedure for the preparation of free-standing polymeric films, embedding and preserving the microspheres, and paving the way for the creation of biocompatible and eco-friendly optical devices to be used in the sensor and anticounterfeiting fields.
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