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<p>Phosphorylated cellulose nanofibril (PCNF)/cellulose nanocrystal (CNC) iridescent films with good flexibility were prepared by using a two-step method. The influence of PCNF concentration, sonication time of CNC suspensions and alkali treatment time of PCNF/CNC film on the change of structural color and toughening of CNC films were systematically investigated. As PCNF concentration increased, the structural color and the maximum reflected light wavelength (λ<sub>max</sub>) of PCNF/CNC films showed a weak blue-shift, and the elongation at break, tensile strength and toughness were significantly improved. The toughness enhancement can be attributed to PCNFs forming stable hydrogen bonds with CNCs, efficiently distributing dispersive loads and enhancing the dissipative capabilities of CNCs. As the sonication time of the CNC suspension increased, the structural color and λ<sub>max</sub> of PCNF/CNC films showed a significant red-shift without affecting its mechanical properties, and thus served to regulate the structural color of the films. Furthermore, the toughness of PCNF/CNC films can also be further enhanced by alkali treatment. This research provides a theoretical framework for the development of flexible, tunable, and all-cellulose-based CNC composite liquid crystal materials that exhibit captivating structural colors.</p>

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A two-step method for producing iridescent and tough all-cellulose liquid crystal films

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Yunzhe Xu,
  • Jing Han,
  • Nuo Xu,
  • Wending Tao,
  • Yifan Chen,
  • Qian Li,
  • Siqun Wang,
  • Qiang Wu

摘要

Phosphorylated cellulose nanofibril (PCNF)/cellulose nanocrystal (CNC) iridescent films with good flexibility were prepared by using a two-step method. The influence of PCNF concentration, sonication time of CNC suspensions and alkali treatment time of PCNF/CNC film on the change of structural color and toughening of CNC films were systematically investigated. As PCNF concentration increased, the structural color and the maximum reflected light wavelength (λmax) of PCNF/CNC films showed a weak blue-shift, and the elongation at break, tensile strength and toughness were significantly improved. The toughness enhancement can be attributed to PCNFs forming stable hydrogen bonds with CNCs, efficiently distributing dispersive loads and enhancing the dissipative capabilities of CNCs. As the sonication time of the CNC suspension increased, the structural color and λmax of PCNF/CNC films showed a significant red-shift without affecting its mechanical properties, and thus served to regulate the structural color of the films. Furthermore, the toughness of PCNF/CNC films can also be further enhanced by alkali treatment. This research provides a theoretical framework for the development of flexible, tunable, and all-cellulose-based CNC composite liquid crystal materials that exhibit captivating structural colors.