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Uniformly aligned flexible magnetic films from bacterial nanocelluloses for fast actuating optical materials

Author

Listed:
  • Xiaofang Zhang

    (Wuhan Textile University
    Georgia Institute of Technology)

  • Saewon Kang

    (Georgia Institute of Technology)

  • Katarina Adstedt

    (Georgia Institute of Technology)

  • Minkyu Kim

    (Georgia Institute of Technology)

  • Rui Xiong

    (Georgia Institute of Technology
    Polymer Research Institute of Sichuan University)

  • Juan Yu

    (Georgia Institute of Technology)

  • Xinran Chen

    (Shanghai Tech University)

  • Xulin Zhao

    (Shanghai Tech University)

  • Chunhong Ye

    (Shanghai Tech University)

  • Vladimir V. Tsukruk

    (Georgia Institute of Technology)

Abstract

Naturally derived biopolymers have attracted great interest to construct photonic materials with multi-scale ordering, adaptive birefringence, chiral organization, actuation and robustness. Nevertheless, traditional processing commonly results in non-uniform organization across large-scale areas. Here, we report magnetically steerable uniform biophotonic organization of cellulose nanocrystals decorated with superparamagnetic nanoparticles with strong magnetic susceptibility, enabling transformation from helicoidal cholesteric (chiral nematic) to uniaxial nematic phase with near-perfect orientation order parameter of 0.98 across large areas. We demonstrate that magnetically triggered high shearing rate of circular flow exceeds those for conventional evaporation-based assembly by two orders of magnitude. This high rate shearing facilitates unconventional unidirectional orientation of nanocrystals along gradient magnetic field and untwisting helical organization. These translucent magnetic films are flexible, robust, and possess anisotropic birefringence and light scattering combined with relatively high optical transparency reaching 75%. Enhanced mechanical robustness and uniform organization facilitate fast, multimodal, and repeatable actuation in response to magnetic field, humidity variation, and light illumination.

Suggested Citation

  • Xiaofang Zhang & Saewon Kang & Katarina Adstedt & Minkyu Kim & Rui Xiong & Juan Yu & Xinran Chen & Xulin Zhao & Chunhong Ye & Vladimir V. Tsukruk, 2022. "Uniformly aligned flexible magnetic films from bacterial nanocelluloses for fast actuating optical materials," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33615-z
    DOI: 10.1038/s41467-022-33615-z
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    References listed on IDEAS

    as
    1. Pei-Xi Wang & Wadood Y. Hamad & Mark J. MacLachlan, 2016. "Structure and transformation of tactoids in cellulose nanocrystal suspensions," Nature Communications, Nature, vol. 7(1), pages 1-8, September.
    2. Takuya Ohzono & Kaoru Katoh & Hiroyuki Minamikawa & Mohand O. Saed & Eugene M. Terentjev, 2021. "Internal constraints and arrested relaxation in main-chain nematic elastomers," Nature Communications, Nature, vol. 12(1), pages 1-10, December.
    3. Sophia Jordens & Lucio Isa & Ivan Usov & Raffaele Mezzenga, 2013. "Non-equilibrium nature of two-dimensional isotropic and nematic coexistence in amyloid fibrils at liquid interfaces," Nature Communications, Nature, vol. 4(1), pages 1-8, October.
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