Jump to main content
Jump to site search

Issue 4, 2017
Previous Article Next Article

Smart molecular-spring photonic droplets

Author affiliations


Complete solid-state cholesteric liquid crystal (CLCsolid) droplets are fabricated using microfluidics after UV curing and chiral-dopant extraction of monodispersed CLC droplets, which consist of a reactive nematic LC mesogen mixture and a nonreactive chiral dopant. The helical pitch of the CLCsolid droplets is reduced by removing the chiral dopant in proportion to the extracted volume. The CLCsolid droplets exhibit a coloured reflection spot at the centre, with cross-communication dots. These photonic colours indicate that the helical photonic CLC structure is well maintained even after UV curing and dopant extraction. The pitch of the well-defined helical photonic structure depends on the solvent quality, temperature, and humidity, giving rise to a reversible change in the reflection colour of the CLCsolid droplets upon exposure to external stimuli. The CLCsolid droplets are extremely stable for a long time, even in a good solvent. These smart solid-state molecular-spring photonic droplets eliminate the obstacles to CLC-droplet application caused by the fluidic LC state, and thus introduce a new avenue for CLC applications.

Graphical abstract: Smart molecular-spring photonic droplets

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Mar 2017, accepted on 28 Apr 2017 and first published on 28 Apr 2017

Article type: Communication
DOI: 10.1039/C7MH00155J
Mater. Horiz., 2017,4, 633-640

  •   Request permissions

    Smart molecular-spring photonic droplets

    K. G. Noh and S. Y. Park, Mater. Horiz., 2017, 4, 633
    DOI: 10.1039/C7MH00155J

Search articles by author