An Optically Responsive Soft Etalon Based on Ultrathin Cellulose Hydrogels

Dong, Yue; Akinoglu, Eser Metin; Zhang, Heyou; Maasoumi, Fatemeh; Zhou, Jinping; Mulvaney, Paul

doi:10.1002/adfm.201904290

Cited by 32 publications

(31 citation statements)

References 49 publications

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“…The reflectance is generally weak for a single layer due to the limited reflectance, but the intensity can be significantly enhanced when the thin film is attached to a highly reflective substrate such as silicon wafers or gold films. [ 24,25 ] The advantage of the single layer Bragg interferometer is the rapid response dynamics, [ 26 ] as the expanding and shrinking of a single layer is much easier than a bulk or multilayered structure, leading to an ultrasensitive response. Multilayer interference occurs in multilayer interferometer systems, resulting in multiple reflections and further enhanced interference.…”

Section: Synthesis Structure and Properties Of Structural Color Matmentioning

confidence: 99%

Structural Color Materials for Optical Anticounterfeiting

Hong

Yuan

Chen

2020

Small

307

251

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The counterfeiting of goods is growing worldwide, affecting practically any marketable item ranging from consumer goods to human health. Anticounterfeiting is essential for authentication, currency, and security. Anticounterfeiting tags based on structural color materials have enjoyed worldwide and long‐term commercial success due to their inexpensive production and exceptional ease of percept. However, conventional anticounterfeiting tags of holographic gratings can be readily copied or imitated. Much progress has been made recently to overcome this limitation by employing sufficient complexity and stimuli‐responsive ability into the structural color materials. Moreover, traditional processing methods of structural color tags are mainly based on photolithography and nanoimprinting, while new processing methods such as the inkless printing and additive manufacturing have been developed, enabling massive scale up fabrication of novel structural color security engineering. This review presents recent breakthroughs in structural color materials, and their applications in optical encryption and anticounterfeiting are discussed in detail. Special attention is given to the unique structures for optical anticounterfeiting techniques and their optical aspects for encryption. Finally, emerging research directions and current challenges in optical encryption technologies using structural color materials is presented.

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Section: Synthesis Structure and Properties Of Structural Color Matmentioning

confidence: 99%

Structural Color Materials for Optical Anticounterfeiting

Hong

Yuan

Chen

2020

Small

307

251

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“…The hygroscopic hydrogels were responsive to humidity by change of both the refractive index and thickness. [ 102 ]…”

Section: Regenerated Robust Cellulose Materialsmentioning

confidence: 99%

Recent Progress in High‐Strength and Robust Regenerated Cellulose Materials

et al. 2020

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High‐strength petroleum‐based materials like plastics have been widely used in various fields, but their nonbiodegradability has caused serious pollution problems. Cellulose, as the most abundant sustainable polymer, has a great chance to act as the ideal substitute for plastics due to its low cost, wide availability, biodegradability, etc. Herein, the recent achievements for developing cellulose “green” solvents and regenerated cellulose materials with high strength via the “bottom‐up” route are presented. Cellulose can be regenerated to produce films/membranes, hydrogels/aerogels, filaments/fibers, microspheres/beads, bioplastics, etc., which show potential applications in textiles, biomedicine, energy storage, packaging, etc. Importantly, these cellulose‐based materials can be biodegraded in soil and oceans, reducing environmental pollution. The cellulose solvents, dissolving mechanism, and strategies for constructing the regenerated cellulose functional materials with high strength and performances, together with the current achievements and urgent challenges are summarized, and some perspectives are also proposed. The near future will be an exciting era for high‐strength biodegradable and renewable materials. The hope is that many environmentally friendly materials with good properties and low cost will be produced for commercial use, which will be beneficial for sustainable development in the world.

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“…Recently, an optically responsive soft etalon based on a double network cellulose hydrogel was reported [ 135 ]. The refractive index and thickness of the hydrogel were changed by the humidity because of optical interference within the metal–insulator–metal (MIM) cavity.…”

Section: Applicationmentioning

confidence: 99%

Advances in Cellulose-Based Hydrogels for Biomedical Engineering: A Review Summary

Zou¹,

Yao²,

Cui³

et al. 2022

Gels

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In recent years, hydrogel-based research in biomedical engineering has attracted more attention. Cellulose-based hydrogels have become a research hotspot in the field of functional materials because of their outstanding characteristics such as excellent flexibility, stimulus-response, biocompatibility, and degradability. In addition, cellulose-based hydrogel materials exhibit excellent mechanical properties and designable functions through different preparation methods and structure designs, demonstrating huge development potential. In this review, we have systematically summarized sources and types of cellulose and the formation mechanism of the hydrogel. We have reviewed and discussed the recent progress in the development of cellulose-based hydrogels and introduced their applications such as ionic conduction, thermal insulation, and drug delivery. Also, we analyzed and highlighted the trends and opportunities for the further development of cellulose-based hydrogels as emerging materials in the future.

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An Optically Responsive Soft Etalon Based on Ultrathin Cellulose Hydrogels

Cited by 32 publications

References 49 publications

Structural Color Materials for Optical Anticounterfeiting

Structural Color Materials for Optical Anticounterfeiting

Recent Progress in High‐Strength and Robust Regenerated Cellulose Materials

Advances in Cellulose-Based Hydrogels for Biomedical Engineering: A Review Summary

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