Shape Memory Hydrogels with Simultaneously Switchable Fluorescence Behavior

Jian, Yukun; Le, Xiaoxia; Zhang, Yuchong; Lü, Wei; Wang, Li; Zheng, Jian; Zhang, Jiawei; Huang, Youju; Chen, Tao

doi:10.1002/marc.201800130

Cited by 24 publications

(10 citation statements)

References 32 publications

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“…A fluorescent hydrogel with a shape-memory behavior is another good choice for constructing advanced anti-counterfeiting platforms. [100][101][102][103] One typical example [102] demonstrated by our team was a PVA-based hydrogel interpenetrated with perylene tetracarboxylic acid-grafted gelatin (PTG) (Figure 19a). Taking Fe 3+ as an "ink", patterned fluorescence quenching endowed the as-prepared hydrogel with the ability to encode information.…”

Section: From Single-dimensional Anti-counterfeiting To Multi-dimensi...mentioning

confidence: 99%

Recent Progress in Smart Polymeric Gel‐Based Information Storage for Anti‐Counterfeiting

Sun

Zhou³

et al. 2022

Advanced Materials

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197

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decryption processes. Furthermore, these traditional anti-counterfeiting strategies are easily duplicated and are unable to counter the growing number of forgery techniques because they are widely recognized. Therefore, there is an urgent need to develop new anti-counterfeiting materials and innovative encryption/decryption approaches to endow stored information with higher security.In recent decades, polymeric gels have been developed as novel materials with programmable 3D network structures that are adaptable and inclusive, showing great potential for applications in various fields such as soft robotics, tissue engineering and information storage. [12][13][14][15][16][17][18][19] Among these, smart gels that exhibit shape morphing or color changes when exposed to external stimuli (e.g., light, heat, electricity, magnetism, mechanical force, or chemicals) have gained much attention. [20][21][22][23] Owing to its unique stimulus-responsiveness, a smart polymeric gel has been proven to be an excellent candidate for information encryption/decryption, exhibiting dynamic information output and a much higher security level. In general, an anti-counterfeiting process consists of three steps: coding, encryption, and decryption. For smart gel-based information storage devices, the external stimulus is the key to the decryption, and the tunable optical properties of the gel are utilized for coding. In other words, the information loaded on the gel is invisible or fake under normal circumstances, and the recipient can obtain the desired message only when the encrypted message is exposed to a particular external stimulus.Although polymeric gel-based information storage devices (PGISDs) are still in their infancy, there has been strong worldwide interest in this field. However, no related review has provided an in-depth overview of gel-based information storage for anti-counterfeiting. This review provides a tutorial overview that summarizes the recent progress in PGISDs, focusing on the preparation methods for gels with adjustable optical properties, their encryption/decryption mechanisms, and how to improve the security level using their dimensions and colors. As depicted in Figure 1, anti-counterfeiting materials based on elaborate gel systems show excellent encryption/decryption behaviors by adjusting either their chemical colors in the presence or absence of UV irradiation or physical colors under visible light (absorption/transmittance, refraction/scattering, and interference/diffraction). Endowing gels that display polychromic colors with stored information can achieve multilevel Information security protection has a tremendous impact on human life, social stability and national security, leading to the rapid development of anti-counterfeiting materials and related techniques. However, the traditional stored information on hard or dry media is often static and lacks functions, which makes it challenging to deal with increasing and powerful counterfeiting technologies. Modified intelligent polymeric gels exhibit color...

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Section: From Single-dimensional Anti-counterfeiting To Multi-dimensi...mentioning

confidence: 99%

Recent Progress in Smart Polymeric Gel‐Based Information Storage for Anti‐Counterfeiting

Sun

Zhou³

et al. 2022

Advanced Materials

Self Cite

197

View full text Add to dashboard Cite

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“…c) Schematic illustration and images showing the information decryption process of PVA-C6 hydrogel via programmable deformation. d) Comparison of shape fixity ratio of shape memory materials including shape memory polymers [25,[34][35][36][37][38][39][40] and shape memory hydrogels [9,22,23,[41][42][43][44][45][46][47] . Scale bars : 1 cm.…”

Section: Resultsmentioning

confidence: 99%

Programming Shape Memory Hydrogel to a Pre‐Encoded Static Deformation toward Hierarchical Morphological Information Encryption

et al. 2022

Adv Funct Materials

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Morphological information encryption such as gesture and sign language is a traditional but efficient way of information storage and communication. However, due to the limited deformability, almost all of the existing information encryption materials store and deliver information via the pattern or color changes on the 2D plane. Herein, a thermo and ion dual-responsive shape memory hydrogel containing short alkyl chains modified polyvinyl alcohol (PVA-C6) and polyacrylamide-co-polyacrylic acid [P(AAm-co-AAc)], is prepared. In this system, the ion-responsive shape memory process of P(AAm-co-AAc) provides the preprogrammed morphological information and actuating force while the thermo-responsive hydrophobic clusters of PVA-C6 are utilized as a molecular switch to control the deformed posture within the deformation process. Incorporated with a photothermal particle, Fe 3 O 4 , the photothermal PVA-C6 hydrogel is capable of generating diverse configurations that can be encoded as the corresponding information. With the assistance of the programmable NIR, the hydrogel can transfer to the encoded configuration and decrypt the information. Besides, the obtained morphological information can also be erased by immersing the hydrogel in hot water, in order to avoid the leakage of information. This study motivates the design and fabrication of deformable materials and provides a new insight into the information encrypt materials.

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“…For example, Chen et al designed a semi-interpenetrating polymer network (SIPN) hydrogel comprised of perylene tetracarboxylic acid-modified chitosan with pH-induced shape memory and simultaneously switchable fluorescence behavior, which brings the convenience to fluorescence-assisted monitor of the shape memory process. [31] Zhao et al employed the inverse opal scaffold to Scheme 1. Schematic illustration of the preparation and the mechanism of cooling-triggered color changeable shape memory PAAm/(PVA-Cu(OAc) 2 ) hydrogel.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Polyacrylamide/(polyvinyl alcohol‐copper acetate) Hydrogel with Cooling‐Triggered Shape Memory, Color Changing, and Self‐Healing Behavior

Yin

Liu

et al. 2022

Macromol. Rapid Commun.

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Inspired by many living creatures with adjustment of shape and color in an ever-changing environment, color changeable shape memory hydrogels are designed and expected to be potential candidates in the fields spanning from anti-counterfeiting to biomedical devices. However, they normally require complex synthesis, and more importantly, the cooling-induced shape recovery hydrogel is still rare and in its infancy so far. Herein, a unique color changeable shape memory hydrogel by simply incorporating polyvinylalcohol and copper acetate into covalent polyacrylamide network is developed. As core functional element, copper ions serve as reversible crosslinks after heating to achieve excellent cooling-triggered shape memory effect, color shifting and self-healing behavior, showing significant potential in diverse applications like grabbing, information encryption, and biomimetic designs. This work may guide the development of cooling-triggered smart hydrogels for practical applications.

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Shape Memory Hydrogels with Simultaneously Switchable Fluorescence Behavior

Cited by 24 publications

References 32 publications

Recent Progress in Smart Polymeric Gel‐Based Information Storage for Anti‐Counterfeiting

Recent Progress in Smart Polymeric Gel‐Based Information Storage for Anti‐Counterfeiting

Programming Shape Memory Hydrogel to a Pre‐Encoded Static Deformation toward Hierarchical Morphological Information Encryption

Bioinspired Polyacrylamide/(polyvinyl alcohol‐copper acetate) Hydrogel with Cooling‐Triggered Shape Memory, Color Changing, and Self‐Healing Behavior

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