Near-Infrared Light-Responsive Poly(<i>N</i>-isopropylacrylamide)/Graphene Oxide Nanocomposite Hydrogels with Ultrahigh Tensibility

Shi, Kun; Liu, Zhuang; Wei, Yun-Yan; Wang, Wei; Ju, Xiao‐Jie; Xie, Rui; Chu, Liang‐Yin

doi:10.1021/acsami.5b08609

Cited by 192 publications

(146 citation statements)

References 59 publications

(103 reference statements)

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“…Similarly to earlier findings [35,36,43], the incorporation of GO effectively improved the mechanical properties and simultaneously decreased the swelling degree (Figure 2a and b). After the post-reduction treatment these properties remained almost unaffected.…”

Section: Resultssupporting

confidence: 87%

“…As was described above, both our SANS and macroscopic measurements suggest a strong interaction between the CNPs and the polymer matrix. A similar suggestion has been proposed earlier as well [25,43,44], however the nature of these interactions is still unrevealed. The possibilities are numerous, e.g.…”

Section: Resultssupporting

confidence: 78%

“…The possibilities are numerous, e.g. first order bonds with the oxygen containing functional groups or with the carbon lattice, secondary bonds (H-bonding) or entanglement of the polymer chains on the platelets [25,43,44]. To gain further knowledge, we have performed TA measurements which may help to shed light on this question.…”

Section: Resultsmentioning

confidence: 99%

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Graphene derivatives in responsive hydrogels: Effect of concentration and surface chemistry

Berke

Sós

Bérczes

et al. 2017

European Polymer Journal

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Reduced graphene oxide (RGO) containing composite hydrogels, based on poly(Nisopropylacrylamide) (PNIPA) were prepared by two different methods: i) by incorporating RGO directly into the polymer matrix; ii) applying a post-synthesis reduction of the grapheneoxide (GO) already incorporated into the polymer. The samples were compared by various microscopic (small angle neutron scattering, differential scanning calorimetry, 1 H NMR spectroscopy, thermogravimetry) and macroscopic (kinetic and equilibrium swelling properties and mechanical testing) techniques. Results from microscopic and macroscopic measurements show that the dispersity of the nanoparticles as well as their interaction with the polymer chains are influenced by their surface chemistry. Incorporation of nanoparticles limits the shrinkage and slows down the kinetics of the thermal response. Both thermogravimetric and solid-state 1 H NMR measurements confirmed strong polymernanoparticle interaction when hydrophilic GO was used in the synthesis. In these cases, the slow thermal response may be explained by the decrease of the free volume inside the nanocomposite matrix caused by a hypernodal structure. Our results imply that both the chemistry and the concentration of incorporated graphene derivatives are promising in tuning the thermal responsivity of PNIPA.

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Section: Resultssupporting

confidence: 87%

Section: Resultssupporting

confidence: 78%

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Graphene derivatives in responsive hydrogels: Effect of concentration and surface chemistry

Berke

Sós

Bérczes

et al. 2017

European Polymer Journal

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“…And multiresponsive supramolecular hydrogel which consists of polyacrylic acid, phenylboronic acid, and agar presents shape memory functionality under triple stimuli 13. However, capability of current responsive hydrogels is commonly too monotonous to meet various requirements, either showing one functionality upon individual trigger,14 or multiresponsive behaviors all resulting in same property 15. Meanwhile, stretchability of hydrogel, which could be enhanced by interpenetrating network structure,16 acts an essential role in researches referring to soft robotics, electronic skin, and artificial muscle 17.…”

mentioning

confidence: 99%

Stretchable Multiresponsive Hydrogel with Actuatable, Shape Memory, and Self‐Healing Properties

et al. 2018

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Smart hydrogels with responsive behaviors have attracted tremendous attention. However, it is still a challenge to synthesize stretchable hydrogels capable of changing their original properties in response to multiple external stimuli. Here, integration of actuation function, shape memory, and self‐healing capability in a highly stretchable hydrogel under triple external triggers is achieved by rationally engineering multiple functional moieties. The hydrogel exhibits high stretchability (average relative strain (mm/mm) is >15) and excellent fatigue resistance during 100 loading cycles of 100% strain. Incorporating a moisture‐insensitive polymer film with the hydrogel, hydroactuated functionality is demonstrated. Moreover, shape memory and self‐healing abilities of the hydrogel are realized by the formation of ionic crosslinking or dynamic borate ester in conditions of multivalent cations and pH, respectively. Deformable plastic flowers are displayed in this work as a proof‐of‐concept, and it is believed that this smart hydrogel could be used in plenty of frontier fields, such as designing electronic devices, soft robotics, and actuators.

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“…[67] If the spiropyrane isomerization is conducted in acidic environ ment, the merocyanine moiety is protonated to the respective cationic species, which influences the respective photoinduced reverse reaction. [93] In the same manner, the evaluation of bioorthogonality of other photochemical reactions remains of high importance, for example it was shown by Li et al that tetrazole photoclick reactions are indeed not bioorthogonal and could be instead used for protein crosslinking. The sensitive wavelengths for both groups can be tuned by varying the substituents.…”

Section: Molecular Mechanismsmentioning

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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Near-Infrared Light-Responsive Poly(N-isopropylacrylamide)/Graphene Oxide Nanocomposite Hydrogels with Ultrahigh Tensibility

Cited by 192 publications

References 59 publications

Graphene derivatives in responsive hydrogels: Effect of concentration and surface chemistry

Graphene derivatives in responsive hydrogels: Effect of concentration and surface chemistry

Stretchable Multiresponsive Hydrogel with Actuatable, Shape Memory, and Self‐Healing Properties

Design and Applications of Photoresponsive Hydrogels

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