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Structurally Colored Thin Films Based on Acetylated Lignin Nanoparticles.

Ravi Shanker1, Anran Mao1, Longzhu Liu2

  • 1Dept. of Fibre and Polymer Technology, Royal Institute of Technology (KTH), Stockholm SE-100 44, Sweden.

ACS Nano
|July 1, 2025
PubMed
Summary
This summary is machine-generated.

Researchers created vibrant, structurally colored films using acetylated lignin nanoparticles. These films display colors from light interference, tunable by thickness and humidity, offering a novel approach to structural coloration.

Keywords:
ligninmembrane emulsificationsnanoparticlessorptionstructural colorsthin-film interference

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Natural colors arise from pigments or structural effects.
  • Structural coloration involves light interference with nanoscale structures to produce vivid hues.
  • Lignin, a biopolymer, presents potential for developing novel nanomaterials.

Purpose of the Study:

  • To develop a feasible strategy for creating structurally colored films using acetylated lignin nanoparticles.
  • To investigate the self-assembly of lignin nanoparticles into multilayered films.
  • To characterize the optical properties and color-generating mechanisms of these films.

Main Methods:

  • Preparation of lignin nanoparticles via membrane emulsification.
  • Self-assembly of nanoparticles into multilayered films on silicon substrates through evaporation.
  • Spectroscopic reflectance measurements and structural analysis.
  • Modeling of optical properties using the transfer matrix method.

Main Results:

  • Achieved vivid structural colors across the visible spectrum, dependent on film thickness.
  • Demonstrated color tunability through variations in film thickness.
  • Observed humidity-dependent color shifts due to changes in reflectance peak positions.
  • Confirmed structural coloration arises from thin-film interference effects.

Conclusions:

  • Acetylated lignin nanoparticles offer a viable platform for creating tunable structural color films.
  • The developed method provides a pathway for bio-based structural coloration.
  • The films' optical properties are predictable and can be modulated by environmental factors like humidity.