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RETURN TO ISSUEPREVApplications of Poly...Applications of Polymer, Composite, and Coating MaterialsNEXT

Chameleon-Inspired Variable Coloration Enabled by a Highly Flexible Photonic Cellulose Film

  • Ze-Lian Zhang
    Ze-Lian Zhang
    The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
  • Xiu Dong
    Xiu Dong
    The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
    More by Xiu Dong
  • Yi-Ning Fan
    Yi-Ning Fan
    The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
    More by Yi-Ning Fan
  • Lu-Ming Yang
    Lu-Ming Yang
    The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
    More by Lu-Ming Yang
  • Lu He
    Lu He
    The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
    More by Lu He
  • Fei Song*
    Fei Song
    The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
    *Email: [email protected]
    More by Fei Song
  • Xiu-Li Wang
    Xiu-Li Wang
    The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
    More by Xiu-Li Wang
  • , and 
  • Yu-Zhong Wang*
    Yu-Zhong Wang
    The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu 610064, China
    *Email: [email protected]
Cite this: ACS Appl. Mater. Interfaces 2020, 12, 41, 46710–46718
Publication Date (Web):September 23, 2020
https://doi.org/10.1021/acsami.0c13551
Copyright © 2020 American Chemical Society

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    Abstract

    Abstract Image

    Due to spontaneous organization of cellulose nanocrystals (CNCs) into the chiral nematic structure that can selectively reflect circularly polarized light within a visible-light region, fabricating stretching deformation-responsive CNC materials is of great interest but is still a big challenge, despite such a function widely observed from existing creatures, like a chameleon, because of the inherent brittleness. Here, a flexible network structure is introduced in CNCs, exerting a bridge effect for the rigid nanomaterials. The as-prepared films display high flexibility with a fracture strain of up to 39%. Notably, stretching-induced structural color changes visible to the naked eye are realized, for the first time, for CNC materials. In addition, the soft materials show humidity- and compression-responsive properties in terms of changing apparent structural colors. Colored marks left by ink-free writing can be shown or hidden by controlling the environmental humidities. This biobased photonic film, acting as a new “smart skin”, is potentially used with multifunctions of chromogenic sensing, encryption, and anti-counterfeit.

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsami.0c13551.

    • AFM images and statistical analysis of neat CNC; zeta potential, CD spectra, XRD, and FTIR characterizations of neat CNC and CNC/PEGDA composite films; comparison of tensile properties with previous reports; cyclic tensile loading–unloading curves of the CNC/PEGDA film; and the schematic illustration of the humidity-dependent encryption (PDF)

    • Movies featuring the stretching processes of the CNC/PEGDA 5-t60 and CNC/PEGDA 5-t15 films and a reversible color change during the latter film’s cyclic stretching process (ZIP)

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    Cited By

    This article is cited by 70 publications.

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