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Cholesteric Spherical Reflectors with Tunable Color from Single-Domain Cellulose Nanocrystal Microshells.

Yong Geng1, Camila Honorato-Rios1,2, JungHyun Noh1

  • 1Department of Physics and Materials Science, University of Luxembourg, Luxembourg, L-1511, Luxembourg.

Advanced Materials (Deerfield Beach, Fla.)
|October 5, 2023
PubMed
Summary
This summary is machine-generated.

Researchers created spherical cellulose nanocrystal (CNC) particles with tunable colors for optical applications. This novel method overcomes previous shape limitations, enabling new uses for biosourced cholesteric liquid crystal (CLC) materials.

Keywords:
cellulose nanocrystal suspensiondryingselective reflectionshell confinementsingle-domain

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Cellulose nanocrystals (CNCs) form cholesteric liquid crystal (CLC) films with wavelength- and polarization-selective Bragg reflection.
  • These biosourced nanoparticles are promising for optical applications, but achieving spherical curvature has been challenging due to buckling in drying droplets.
  • Spherical CLC structures could offer enhanced optical properties compared to flat films.

Purpose of the Study:

  • To develop a method for creating spherical, single-domain cholesteric CNC particles.
  • To overcome the buckling and shape instability issues encountered when drying CNC suspension droplets.
  • To enable tunable retroreflection colors in spherical CNC particles for advanced optical applications.

Main Methods:

  • Confining CNC suspensions within spherical microshells surrounding incompressible oil droplets.
  • Utilizing the microshell confinement to prevent buckling and induce helix pitch compression during drying.
  • Mixing different CNC types to tune the helical pitch and thus the retroreflection color.

Main Results:

  • Successfully produced single-domain cholesteric spherical reflector particles with distinct visible colors.
  • The confinement strategy prevented buckling and ensured spherical morphology.
  • Spontaneous puncturing of the microshells allowed for oil extraction and recycling.
  • Tunable retroreflection colors were achieved by varying CNC fractions, covering the visible spectrum.

Conclusions:

  • A novel method enables the creation of spherically curved, single-domain cholesteric CNC particles.
  • This approach overcomes previous limitations in fabricating spherical CLC structures from CNCs.
  • The resulting particles offer excellent optical quality and tunable colors, expanding the utility of biosourced CLCs in optics.