Highly Strong and Solvent-Resistant Cellulose Nanocrystal Photonic Films for Optical Coatings

Zhang, Fusheng; Ge, Wenna; Wang, Cunli; Zheng, Xintong; Wang, Dongdong; Zhang, Xiancheng; Wang, Xue; Xue, Xian; Qing, Guangyan

doi:10.1021/acsami.1c02753

Cited by 54 publications

(45 citation statements)

References 66 publications

(106 reference statements)

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“…[ 54 ] The n avg of these CNC/PEG–Eu composites hardly changed at 1.51. [ 53 ] According to the equation, the blueshift of the CPE–Red film was attributed to the decrease of P . The p‐ value corresponds to a distance between two continuous interlayers of the fracture surface of chiral nematic materials, which could be observed through the scanning electron microscope (SEM).…”

Section: Resultsmentioning

confidence: 99%

Multimodal, Convertible, and Chiral Optical Films for Anti‐Counterfeiting Labels

Zhang

Wang

et al. 2022

Adv Funct Materials

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Designing a sustainable security model that carries multilevel information with numerous optical states will significantly enhance anti-counterfeiting abilities to deter counterfeits, ranging from artworks, currencies, and foods to medicines, but is enormously challenging. Herein, ambient-friendly, large-area, quadruple-level, and chiral luminescent materials are prepared by incorporating lanthanide complexes wrapped in poly(ethylene glycol) matrix into chiral nematic cellulose nanocrystal (CNC) films through a co-assembly strategy. Due to the regulation of the chiral nematic structures, the composite films enable full-color structural colors and tunable fluorescence. Notably, the brightest fluorescent film radiates right-handed circularly polarized luminescence with an asymmetric factor over −0.36, a lifetime up to 510 µs, and an absolute quantum yield up to 66.7%. More interestingly, a fascinating chirooptical behavior ranging from azure to khaki can be controlled by a polarizing filter at given 0° and 90° rotation angles. This anti-counterfeiting system showcases the comprehensive properties of bright and responsive photoluminescence, quadruple and convertible color, and flexible and solvent-resistant abilities. This CNC-derived photonic material can act as the multimodal security label on a model banknote, which greatly facilitates its development for practical applications.

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Section: Resultsmentioning

confidence: 99%

Multimodal, Convertible, and Chiral Optical Films for Anti‐Counterfeiting Labels

Zhang

Wang

et al. 2022

Adv Funct Materials

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“…There are additional reports on diverse cellulosic ChLC solid functional materials-such as structurally colored liquid marbles [80] and clay composites [81], photonic skins to visualize human motion [82,83], transistors for CPL-sensing [84], solvent-resistant photonic films [85], mechanically anisotropic composites [86], CPL-luminescent films incorporating quantum dots [87], pressure-sensitive aerogels [88], humidity-responsive photonic microarrays [89], and inkjet-printed photonic patterns [90]. These studies will facilitate expansion of the range of applications of cellulosic materials to industrial sectors in which cellulose is often considered to be incompatible with high performance.…”

Section: Other Cellulosic Chlc Solid Functional Materialsmentioning

confidence: 99%

Construction of Functional Materials in Various Material Forms from Cellulosic Cholesteric Liquid Crystals

Miyagi

Teramoto

2021

Nanomaterials

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Wide use of bio-based polymers could play a key role in facilitating a more sustainable society because such polymers are renewable and ecofriendly. Cellulose is a representative bio-based polymer and has been used in various materials. To further expand the application of cellulose, it is crucial to develop functional materials utilizing cellulosic physicochemical properties that are acknowledged but insufficiently applied. Cellulose derivatives and cellulose nanocrystals exhibit a cholesteric liquid crystal (ChLC) property based on rigidity and chirality, and this property is promising for constructing next-generation functional materials. The form of such materials is an important factor because material form is closely related with function. To date, researchers have reported cellulosic ChLC materials with a wide range of material forms—such as films, gels, mesoporous materials, and emulsions—for diverse functions. We first briefly review the fundamental aspects of cellulosic ChLCs. Then we comprehensively review research on cellulosic ChLC functional materials in terms of their material forms. Thus, this review provides insights into the creation of novel cellulosic ChLC functional materials based on material form designed toward the expanded application of cellulosics.

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“…[32][33][34] Chemical cross-linking methods can further improve the stiffness and solvent-resistance of these photonic composites. [35,36] Yet now, the above mechanical strain is only as high as ≈40%, which limits their applications in the field of high-performance devices or optics (Figure 1c). Recently, Kose et al reported a delicate and sophisticated strategy that packaged the chiral nematic structures of CNCs into hydrophobic Cellulose-based photonic structures.…”

Section: Introductionmentioning

confidence: 99%

Highly Tough, Stretchable, and Solvent‐Resistant Cellulose Nanocrystal Photonic Films for Mechanochromism and Actuator Properties

Zhang

Wang

et al. 2022

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tissues could be organized into a helical assembly, [4][5][6] showing remarkable photonic properties and attractive structural anisotropy. The advantages of cellulosic sustainability and biocompatibility make it superior to other photonic materials to produce optical materials. Bioinspired cellulose's multiscale architecture has implemented a series of photonic building blocks, mainly including hydroxypropyl cellulose, [7] ethylcellulose, [8] and cellulose nanocrystal (CNC). [9,10] Among them, the self-assembly of CNCs into chiral photonic structures is the most representative. An artistic view (Figure 1a) shows a solid film formed by the selfassembly of CNCs, which is similar to the Bouligand structure of the beetle exoskeleton. [11,12] CNCs consist of each chain of β-(poly-1,4-D-glucose) stabilized via hydrogen bonds and hydrophobic interactions that provide mechanical stiffness to the solid film. [13] CNC-derived photonic materials have spawned a series of exciting applications in the fields of sensors, [14,15] optics, [16,17] electronics, [18] and engineering. [19,20] However, in many cases, the above materials rarely undergo elastic deformation but crack in bending, thus compromising their outstanding properties. In addition, the photonic structures of these materials are incompatible with humid and liquid environments because of their high hygroscopicity and water solubility.Cellulose nanocrystals (CNCs)-derived photonic materials have confirmed great potential in producing renewable optical and engineering areas. However, it remains challenging to simultaneously possess toughness, strength, and multi ple responses for developing high-performance sensors, intelligent coatings, flexible textiles, and multifunctional devices. Herein, the authors report a facile and robust strategy that poly(ethylene glycol) dimethacrylate (PEGDMA) can be converged into the chiral nematic structure of CNCs by ultraviolet-triggered free radical polymerization in an N,N-dimethylformamide solvent system. The resulting CNC-poly(PEGDMA) composite exhibits impressive strength (42 MPa), stretchability (104%), toughness (31 MJ m −3 ), and solvent resistance. Notably, it preserves vivid optical iridescence, displaying stretchable variation from red, yellow, to green responding to the applied mechanical stimuli. More interestingly, upon exposure to spraying moisture, it executes sensitive actuation (4.6° s −1 ) and multiple complex 3D deformation behaviors, accompanied by synergistic iridescent appearances. Due to its structural anisotropy of CNC with typical left-handedness, the actuation shows the capability to generate a high probability (63%) of right-handed helical shapes, mimicking a coiled tendril. The authors envision that this versatile system with sustainability, robustness, mechanochromism, and specific actuating ability will open a sustainable avenue in mechanical sensors, stretchable optics, intelligent actuators, and soft robots.The ORCID identification number(s) for the author(s) of this article can be found under https:/...

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Highly Strong and Solvent-Resistant Cellulose Nanocrystal Photonic Films for Optical Coatings

Cited by 54 publications

References 66 publications

Multimodal, Convertible, and Chiral Optical Films for Anti‐Counterfeiting Labels

Multimodal, Convertible, and Chiral Optical Films for Anti‐Counterfeiting Labels

Construction of Functional Materials in Various Material Forms from Cellulosic Cholesteric Liquid Crystals

Highly Tough, Stretchable, and Solvent‐Resistant Cellulose Nanocrystal Photonic Films for Mechanochromism and Actuator Properties

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