High-performance bioinspired multi-responsive chiral cellulose nanocrystals-based flexible films for information encryption

He, Manjie; Hsu, Yu-I; Uyama, Hiroshi

doi:10.1016/j.cej.2024.153516

Chemical Engineering Journal

2024

DOI: 10.1016/j.cej.2024.153516

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High-performance bioinspired multi-responsive chiral cellulose nanocrystals-based flexible films for information encryption

Manjie He,

Yu-I Hsu,

Hiroshi Uyama

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Cited by 3 publications

References 86 publications

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Controlled Stratification and Assembly of Cellulose Nanocrystals in Polymeric Films Toward Optically Active Coatings

Khelifa,

Ehmann,

Lamaoui

et al. 2024

Adv Materials Inter

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Nature's most brilliant hues arise from the interaction of light with multilayered‐ structures of aligned building blocks. Mimicking this hierarchical organization in highly‐ordered thin films of liquid crystalline species has attracted increasing attention for potential applications in sensors and optical switching displays. Due to its intriguing ability to organize into optically active materials, cellulose nanocrystals (CNCs) are attracting a strong interest in the scientific community. This study demonstrates that the shear‐driven convective assembly technique can be used to stratify in a controlled fashion highly ordered multilayers of rod‐like CNC embedded in a protective hydrophobic polymer matrix leading to optically active thin films. The films remain fully transparent even after stratifying 50 layers. Atomic force microscopy analysis reveals that over 87% of the CNCs in the upper layer aligned within ±20° of the withdrawal direction. Notably, the stratification does not disrupt the organization of the underlying layers. The films exhibit strong selective reflections with uniform and intense colors, dependent on the number of stratified layers. This scalable appraoch enables precise control over the optical characteristics of CNC‐polymer composite films, presenting opportunities for environmentally friendly applications in pigment‐free coatings, security papers, and optical devices.

show abstract

Controlled Stratification and Assembly of Cellulose Nanocrystals in Polymeric Films Toward Optically Active Coatings

Khelifa,

Ehmann,

Lamaoui

et al. 2024

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

Multi-stimulus response AIE fluorescent hydrogel for “Blind box” multistage secure information encryption

Liu,

Yang,

Liu

et al. 2024

Chemical Engineering Journal

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Soft lithography for flexible structural color films by laser interference lithography

Liu,

Wang,

et al. 2025

Optics & Laser Technology

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High-performance bioinspired multi-responsive chiral cellulose nanocrystals-based flexible films for information encryption

Cited by 3 publications

References 86 publications

Controlled Stratification and Assembly of Cellulose Nanocrystals in Polymeric Films Toward Optically Active Coatings

Controlled Stratification and Assembly of Cellulose Nanocrystals in Polymeric Films Toward Optically Active Coatings

Multi-stimulus response AIE fluorescent hydrogel for “Blind box” multistage secure information encryption

Soft lithography for flexible structural color films by laser interference lithography

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