Dynamic Spirals of Nanoparticles in Light-Responsive Polygonal Fields

Tetiana Orlova, Rémi Plamont, Alexis Depauw, Nathalie Katsonis*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Nanoparticles tend to aggregate once integrated into soft matter and consequently, self-assembling nanoparticles into large-scale, regular, well-defined, and ultimately chiral patterns remains an ongoing challenge toward the design and realization of organized superstructures of nanoparticles. The patterns of nanoparticles that are reported in liquid crystals so far are all static, and this lack of responsiveness extends to assemblies of nanoparticles formed in topological singularities and other localized structures of anisotropic matter. Here, it is shown that gold nanoparticles form spiral superstructures in polygonal fields of cholesteric liquid crystals. Moreover, when the cholesteric liquid crystals incorporate molecular photoswitches in their composition, the pitch of the nanoparticulate spirals follows the light-induced reorganization of the cholesteric liquid crystals. These experimental findings indicate that chiral liquid crystals can be used as chiral and dynamic templates for soft photonic nanomaterials. Controlling the geometry of these spirals of nanoparticles will ultimately allow modulating the plasmonic signature of hybrid and chiral systems.

Original languageEnglish
Article number1902419
JournalSmall
Volume15
Issue number39
Early online date6 Aug 2019
DOIs
Publication statusPublished - 25 Sep 2019

Keywords

  • UT-Hybrid-D
  • molecular switches
  • nanoparticles
  • self-assembly
  • smart materials
  • chirality

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