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

Zhang, Feng; Xiong, Li-Gui; Ai, Yongjian; Liang, Zhe; Liang, Qionglin

doi:10.1002/advs.201800450

Cited by 121 publications

(80 citation statements)

References 40 publications

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Section: Progress On Strategies To Improve the Her Catalytic Activitymentioning

confidence: 99%

“…Besides the doping strategies, formation of the hybrid structures has also been considered to offer multifunctions of the 2D TMD‐based catalyst. [ 153 ] For example, Zheng and co‐workers reported the hybrid structure of nickel hydr(oxy)oxide nanoparticles and the 1T MoS 2 nanosheets. The Ni‐based nanoparticles were homogenously loaded on the MoS 2 sheets (Figure 9e), facilitating the adsorption and dissociation of H 2 O, and supplying protons for subsequent HER reactions at nearby active sites on the 1T‐MoS 2 .…”

Section: Progress On Strategies To Improve the Her Catalytic Activitymentioning

confidence: 99%

See 1 more Smart Citation

Engineered 2D Transition Metal Dichalcogenides—A Vision of Viable Hydrogen Evolution Reaction Catalysis

Lin

Sherrell

Liu

et al. 2020

Advanced Energy Materials

213

174

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Tackling global climate change and the energy crisis requires novel approaches in clean energy generation and efficient manufacturing. [1] Hydrogen (H 2 ) is one of the most popular clean energy sources, providing the highest energy outputThe hydrogen evolution reaction (HER) is an emerging key technology to provide clean, renewable energy. Current state-of-the-art catalysts still rely on expensive and rare noble metals, however, the relatively cheap and abundant transition metal dichalcogenides (TMDs) have emerged as exceptionally promising alternatives. Early studies in developing TMD-based catalysts laid the groundwork in understanding the fundamental catalytically active sites of different TMD phases, enabling a toolbox of physical, chemical, and electronic engineering strategies to improve the HER catalytic activity of TMDs. This report focuses on recent progress in improving the catalytic properties of TMDs toward highly efficient production of H 2 . Combining theoretical and experimental considerations, a summary of the progress to date is provided and a pathway forward for viable hydrogen evolution from TMD driven catalysis is concluded.

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Section: Progress On Strategies To Improve the Her Catalytic Activitymentioning

confidence: 99%

Section: Progress On Strategies To Improve the Her Catalytic Activitymentioning

confidence: 99%

Engineered 2D Transition Metal Dichalcogenides—A Vision of Viable Hydrogen Evolution Reaction Catalysis

Lin

Sherrell

Liu

et al. 2020

Advanced Energy Materials

213

174

View full text Add to dashboard Cite

show abstract

“…Physical crosslinking points, also called as dynamic noncovalent bonds, include hydrogen bonds, metal coordination bonds, hydrophobic interaction, electrostatic ionic interaction, π‐π stacking, and host‐guest inclusion . Chemical crosslinking points include dynamic covalent bonds, such as imine bonds, acylhydrazone bonds, disulfide bonds, boron ester bonds, and nondynamic covalent bonds that cannot be reformed after breakage. Among all kinds of interactions, the dynamic bonds have been widely applied.…”

Section: Introductionmentioning

confidence: 99%

Self‐healing and conductivity of chitosan‐based hydrogels formed by the migration of ferric ions

Cheng

Bao

et al. 2019

J of Applied Polymer Sci

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The currently reported self-healing hydrogels have problems of low mechanical strength, single performance, and poor self-healing efficiency, which greatly limit their applications. Here, through adding N-carboxyethyl chitosan to acrylic-Fe 3+ system, the self-healing physically crosslinked hydrogels were prepared via in situ free radical polymerization, which have excellent self-healing ability and mechanical properties. The maximum tensile strength and elongation at break of the hydrogels can reach up to 280 KPa and 1900%, respectively. Owing to the reversibility of coordination, self-healing efficiency of the hydrogels can reach 98% in 2.5 h. Moreover, the hydrogels also have good conductivity due to the migration of Fe 3+ . This strategy can broaden the applications of chitosan-based self-healing hydrogels.Since the metal coordination has multiple coordination points, it can form hydrogels with high strength and self-healing ability. Metal ions, like Fe 3+ , Zn 2+ , Cu 2+ , can form strong coordination with some groups, such as OH, COOH, NH 2. 32-34 The ionicAdditional Supporting Information may be found in the online version of this article.

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“…Figure c demonstrates ultimate tensile strength and healing efficiency comparison of various soft actuator materials (details are in Table S3, Supporting Information) . Thanks to the reversible hydrogen bonding and covalent bonding crosslinking networks (Figure a), our actuator material has two distinctive advantages: i) it exhibits relatively high mechanical ultimate strength (3 MPa) and stretchability, which make it more robust than other soft actuators for further applications . ii) It is able to repeatedly heal itself at low ambient temperature (≤35 °C) with great self‐healing efficiency, which makes it much more suitable for the maintenance of complicated 3D structured actuators.…”

mentioning

confidence: 99%

Arbitrarily 3D Configurable Hygroscopic Robots with a Covalent–Noncovalent Interpenetrating Network and Self‐Healing Ability

et al. 2019

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Very recently, dynamic exchangeable covalent-bonding-based liquid crystal elastomer provided a new route for actuators with 3D shape mouldability and actuation capacity. [2,13,14] The dynamic transesterification reaction of these materials occurs at a temperature generally above 160 °C to allow shape molding, such as 3D flower and 3D wheel. [11] Meanwhile, Zhang et al. [10] prepared microchannel-programmed actuators through UV lithography template method. The film actuator is capable of reversibly changing its 3D shapes when exposed to acetone vapor. Despite brilliant advances, the manufacturing of those polymeric actuators typically involves high melt temperature, high pressure, hazardous chemical solvent or sophisticated machining equipment, which dramatically restricts the shaping of the actuators with complicated 3D structure. Furthermore, few soft actuators can maintain their inherent 3D structures when completely cut or damaged, and the entire devices have to be disposed. To conclude, a soft actuator with straightforward and eco-friendly shaping and reshaping processing condition and excellent self-healing ability is highly demanded.To address this issue, we present a biopolyester with hydrogen bonding and covalent bonding interpenetrating network, resulting in a mechanically robust, hygroscopic actuator that can arbitrarily shape and reshape the 3D geometric configuration at low ambient temperature (≤35 °C). Meanwhile, it exhibits excellent self-healing ability to maintain high performance of 3D structured actuators. Furthermore, specific 3D structures of the water-gradient-driven actuators are demonstrated to achieve different potential applications. The arbitrary shape deformations that copolyesters undergo at low temperature can inspire a new generation of synthetic soft actuators, which are in demand for actuating technologies, such as biomedical devices, flexible electronics, and soft robotics.To prepare the hygroscopic actuator with shaping and reshaping processability at low ambient temperature (≤35 °C), humidity-responsive macromolecular prepolymer with the melting point (T m = 23.48 °C) was first synthesized through the effective condensation copolymerization reaction of crystalline poly(ethylene glycol) (PEG) and poly(tetramethylene glycol) (PTMG) precursor ( 1 H NMR, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC) analysis Soft materials that can reversibly transform shape in response to moisture have applications in diverse areas such as soft robotics and biomedicine. However, the design of a structurally transformable or mechanically selfhealing version of such a humidity-responsive material, which can arbitrarily change shape and reconfigure its 3D structures remains challenging. Here, by drawing inspiration from a covalent-noncovalent network, an elaborately designed biopolyester is developed that features a simple hygroscopic actuation mechanism, straightforward manufacturability at low ambient temperature (≤35 °C), fast and stable response, robust mechanica...

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

Cited by 121 publications

References 40 publications

Engineered 2D Transition Metal Dichalcogenides—A Vision of Viable Hydrogen Evolution Reaction Catalysis

Engineered 2D Transition Metal Dichalcogenides—A Vision of Viable Hydrogen Evolution Reaction Catalysis

Self‐healing and conductivity of chitosan‐based hydrogels formed by the migration of ferric ions

Arbitrarily 3D Configurable Hygroscopic Robots with a Covalent–Noncovalent Interpenetrating Network and Self‐Healing Ability

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