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Bioinspired Nanofluidic-Assisted Printing Cellulose Nanocrystal Photonic Patterns.

Jiemin Qiu1, Canhui Lu1, Rui Xiong1

  • 1National Key Laboratory of Advanced Polymer Materials, Polymer Research Institute, Sichuan University, Chengdu 610065, China.

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Summary

This study introduces a novel nanofluidic technique for creating advanced cellulose nanocrystal (CNC) photonic films. These sustainable structural color materials offer tunable properties and secure anticounterfeiting applications.

Keywords:
anticounterfeitingcellulose nanocrystalscircularly polarized luminescencephotonic patternsscalable printing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Cellulose nanocrystals (CNCs) offer sustainable structural color but scalable patterning is challenging.
  • Conventional printing and coassembly methods limit functionalization and pattern control.
  • Existing methods struggle with continuous functionalization and maintaining chiral order.

Purpose of the Study:

  • To develop a scalable technique for fabricating functionalized CNC photonic films.
  • To enable integration of diverse components for tunable optical and responsive properties.
  • To create advanced materials for anticounterfeiting and other applications.

Main Methods:

  • Sequential Nanofluidic-Assisted Photonic Patterning (SNAPP) technique.
  • Utilizing preformed cholesteric CNC films with helical nanochannels for controlled ink diffusion.
  • Combining mask-guided patterning with capillary-driven transport for precise pattern formation.

Main Results:

  • Achieved full visible-spectrum structural colors with tunable properties.
  • Integrated functional components (carbon dots, polymers) for stimuli-responsive behaviors (humidity, thermal).
  • Demonstrated enhanced fluorescence and circularly polarized luminescence, enabling dual-channel optical encryption.

Conclusions:

  • SNAPP technique overcomes limitations of traditional methods for CNC photonic film fabrication.
  • Developed a versatile platform for scalable production of functional photonic materials with dynamic responses.
  • High-security anticounterfeiting solutions for pharmaceuticals are enabled by the multifunctional platform.