Light‐Switchable Self‐Healing Hydrogel Based on Host–Guest Macro‐Crosslinking

Yang, Qiaofeng; Wang, Ping; Zhao, Chuanzhuang; Wang, Wen-Qin; Yang, Jingfa; Qiao, Li

doi:10.1002/marc.201600741

Cited by 80 publications

(60 citation statements)

References 41 publications

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“…The photoresponsive gels feature remote controlling, fast response, and precise targeting, which has attracted much attention for their numerous applications in smart sensing devices, controlled‐release systems, self‐healing materials, logic gates, and so forth. Notably, azobenzene derivatives have been highlighted in constructing such kind of gels, in that the reversible photoisomerization significantly influences the polarity of both isomers and their interaction with solvents, leading to a great effect on the gelation ability .…”

Section: Methodsmentioning

confidence: 99%

Photomodulated Morphologies in Halogen Bond–Driven Assembly during Gel–Sol Transition

Qiu

Wang

et al. 2018

Macromol. Rapid Commun.

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Photoresponsive supramolecular gels with various applications are being constantly pursued; however, achieving well‐defined morphology changes of gels via light irradiation remains a formidable challenge. In this study, a gel is prepared through halogen bond between azopyridine‐containing Azopy‐C10 and 1,4‐tetrafluorodiiodobenzene. The gel exhibits gel–sol transition due to trans–cis isomerization of the azopyridine moiety upon UV irradiation. During this transition, the morphologies vary from flake to fluffy bobble‐like and finally to peony‐like with increasing exposure time, which is difficult to achieve in traditional assembly systems. The microstructure change is attributed to the variations of cis‐isomer content and halogen‐bonding strength. The supramolecular gel provides a novel method to achieve photomodulated morphologies and broadens the applications of such kind of materials, ranging from information storage to high‐tech anticounterfeit.

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Section: Methodsmentioning

confidence: 99%

Photomodulated Morphologies in Halogen Bond–Driven Assembly during Gel–Sol Transition

Qiu

Wang

et al. 2018

Macromol. Rapid Commun.

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“…[137] When the network structure is torn apart by physical damage, e.g., a knife cut, the hydrogel fragments could bind back together due to the dynamic nature of hostguest interactions between the azobenzene acrylamide units in the network backbone and the βCD crosslinker. [137] When the network structure is torn apart by physical damage, e.g., a knife cut, the hydrogel fragments could bind back together due to the dynamic nature of hostguest interactions between the azobenzene acrylamide units in the network backbone and the βCD crosslinker.…”

Section: Photocontrolled Host-guest Interactionmentioning

confidence: 99%

Design and Applications of Photoresponsive Hydrogels

2019

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materials with diverse applications in var ious fields due to their tunable chemistry structure and physical properties as well as excellent biocompatibility. [2][3][4][5] Hydrogel research has evolved from static mate rials to smart ones, whose structures and property show responsiveness to external stimuli, including temperature, pH, light, electric or magnetic fields, and the pres ence of enzymes or ion concentrations. [6][7][8][9][10][11] This unprecedented level of control over material properties has driven both med ical and industrial fields into the realm of possibility: controlled drug delivery, [12] chemical sensors, [13] soft actuators or robotics, [14][15][16] or scaffolds for dynamic 3D cell culture. [17] Photoresponsiveness is attractive due to the inherent advan tages of light as stimulus. Light is non invasive and allows remote manipulation of materials without requiring additional reagents, thus, with limited byproducts. Modulation of irradiation parameters, such as light intensity and irradiation time, permits the pre cise control of irradiation dosage, thereby, the degree of photo reactions. Spatial control can be achieved in both 2D and 3D, and temporal control is possible by simply turning the respec tive light source on or off. Wavelengthselective photo chemical reactions can be used for orthogonal photomediation of hydrogel properties. [18] Photoresponsive hydrogels, as externally tunable materials, strongly contribute to the field of soft smart materials in regard to the abovementioned applications. [19] In this review, we elaborate on the design and the emerging appli cations of photoresponsive hydrogels. A comprehensive review about utilizing light for the formation of hydrogels is given by Mi and coworkers. [20] First, we discuss responsive modes and photochemical mechanisms of photoresponsive hydrogels. Fol lowing this, we highlight their applications for dynamic cell environments, smart biointerfaces, controlled drug delivery, photodriven actuators, and lighthealing materials. The review concludes with an outlook on the challenges and potential future approaches for photo responsive hydrogels. Light as Stimulus for Hydrogels Macroscopic Hydrogel PhotoresponsesThe interaction of light with photoresponsive hydrogels can result in different responses, some of which are observable with the bare eye. Those include hydrogel formation or degradation, network contraction or expansion, and chemical modifications in the network, which then have an immediate consequence on Hydrogels are the most relevant biochemical scaffold due to their tunable properties, inherent biocompatibility, and similarity with tissue and cell environments. Over the past decade, hydrogels have developed from static materials to "smart" responsive materials adapting to various stimuli, such as pH, temperature, chemical, electrical, or light. Light stimulation is particularly interesting for many applications because of the capability of contact-free remote manipulation of biomaterial properties and inherent spatial and t...

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“…Self‐healing hydrogels drew great attentions in past decade because of their self‐healing property similar to the living creatures and wide application in bioscience and biotechnologies . As a result, large amount of self‐healing hydrogels were reported based on both intermolecular force and reversible dynamic bond . The self‐healing hydrogel can be based on a series of dynamic covalent bonds and each has its own advantages.…”

Section: Introductionmentioning

confidence: 99%

Cross‐linking induced thermoresponsive hydrogel with light emitting and self‐healing property

Shen

Wang

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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Development of self‐healing hydrogels with thermoresponse is very important for artificial smart materials. In this article, the self‐healing hydrogels with reversible thermoresponses were designed through across‐linking‐induced thermoresponse (CIT) mechanism. The hydrogels were prepared from ketone group containing copolymer bearing tetraphenyl ethylene (TPE) and cross‐linked by naphthalene containing acylhydrazide cross‐linker. The mechanical property, light emission, self‐healing, and thermo‐response of the hydrogels were investigated intensively. With regulation of the copolymer composition, the hydrogels showed thermoresponse with the LCST varied from above to below body temperature. At the same time, the hydrogels showed self‐healing property based on the reversible characteristic of the acylhydrazone bond. The hydrogel also showed temperature‐regulated light emission behavior based on AIE property of the TPE unit. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 869–877

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Light‐Switchable Self‐Healing Hydrogel Based on Host–Guest Macro‐Crosslinking

Cited by 80 publications

References 41 publications

Photomodulated Morphologies in Halogen Bond–Driven Assembly during Gel–Sol Transition

Photomodulated Morphologies in Halogen Bond–Driven Assembly during Gel–Sol Transition

Design and Applications of Photoresponsive Hydrogels

Cross‐linking induced thermoresponsive hydrogel with light emitting and self‐healing property

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