Anisotropic nanocomposite hydrogels with enhanced actuating performance through aligned polymer networks

Tang, Ping; Yan, Hao; Chen, Lie; Wu, Qingshan; Zhao, Tianyi; Li, Shuhong; Gao, Hainan; Liu, Mingjie

doi:10.1007/s40843-019-1236-8

Cited by 38 publications

(26 citation statements)

References 65 publications

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“…As shown in Figure 1f, despite powder samples being used for the SAXS experiment, the 2D pattern of PMZ SNBs was anisotropic, confirming the presence of highly ordered columns of nanoclusters. [ 19–21 ] Although the PMT SNBs were synthesized using a similar method to the PMZ SNBs, enormous structural differences were observed between them. As shown by TEM (Figure 1g and Figure S1b, Supporting Information), STEM (Figure 1h) and AFM (Figure S2c,d, Supporting Information), the PMT SNBs also had a sub‐nanometer thickness, but only measured hundreds of nanometers in length.…”

Section: Resultsmentioning

confidence: 99%

Sub‐Nanometer Nanobelts Based on Titanium Dioxide/Zirconium Dioxide–Polyoxometalate Heterostructures

et al. 2021

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In addition to offering conformational flexibility, sub‐nanometer nanobelts (SNBs) also outperform many larger nanobelts with large size owing to their ultrathin morphologies. However, to date, only a few monocomponent SNBs have been synthesized. This study presents a facile method for synthesizing ZrO2–PMoO (PMZ) SNBs and TiO2–PMoO (PMT) SNBs with heterostructures. The SNBs comprise ZrO2/TiO2 and polyoxometalate (POM) nanoclusters, which are formed via the aggregation and subsequent transformation of nanoclusters. Significantly, these SNBs demonstrate high catalytic activity and stability in oxidative desulfurization reactions at room temperature. The impressive catalytic performance of the SNBs is aided by the POM nanoclusters, which not only coassemble with ZrO2/TiO2 nuclei to form building blocks of PMZ SNBs/PMT SNBs but also serve as catalytic centers. The catalytic performance is further enhanced by the ZrO2/TiO2 in the SNBs. Moreover, the proposed synthesis method can be utilized to produce other SNBs. Thus, this method provides valuable insights into the strong performance properties of SNBs created by combining metal oxides and POM nanoclusters into SNBs, which have great potential as redox catalysts.

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Section: Resultsmentioning

confidence: 99%

Sub‐Nanometer Nanobelts Based on Titanium Dioxide/Zirconium Dioxide–Polyoxometalate Heterostructures

et al. 2021

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“…Four main configurations, including the bilayer structure, gradient structure, patterned structure and oriented structure, are employed to build anisotropic actuators. 134 The maximum output strain of an actuator could be 20%, 135 and an output force of 1.8 MPa 136 can be achieved with a work density of 460 kJ/m 3 . By utilisation of an adjustable electric stimulation source, HGAs can achieve a highly controllable actuation state and tuneable actuation degree.…”

Section: Resultsmentioning

confidence: 99%

Comparative study of robotic artificial actuators and biological muscle

Liang

Liu

Wang

et al. 2014

Advances in Mechanical Engineering

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Biological muscles exhibit a high level of integration, in which actuators, sensors and transmission elements can be included in one component. Artificial muscles or actuators refer to intelligent stimuli-responsive materials that could reversibly deform with the trigger of various external stimuli. These materials, which have attracted tremendous attention, produce natural muscle-like actuation performance and show promising applications in robotics. After an introduction of various actuator technologies that contribute to robotic applications, a comparative analysis of the main actuation parameter is provided. The comprehensive comparisons of each kind of artificial muscle are summarised, and the promising properties that are required in robotics are presented, which highlight the development of their actuation performances and the challenges that limit their further employments. Future developmental prospects and perspectives of artificial actuators are discussed.

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“…1b). Gelation time is the linchpin to the production process and clinical application, which should be short enough to ensure the convenience [18,[39][40][41][42]. The vial inversion method was adopted to evaluate the effect of Am and γ-PGA biopolymer with a series of contents on the gelation time (Fig.…”

Section: Preparation and Characterization Of Hydrogelsmentioning

confidence: 99%

Bio-inspired hydrogel-based bandage with robust adhesive and antibacterial abilities for skin closure

Wang

Ren

et al. 2021

Sci. China Mater.

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Although conventional suturing techniques are commonly used in assisting wound closure, they do pose limited conduciveness and may lead to secondary injury to wound tissues. Inspired by marine organism mussels, we designed and manufactured a bio-inspired hydrogel-based bandage with tough wet tissue adhesion to substitute traditional surgical suture, accelerate wound healing and avoid infection. Poly(γ-glutamic acid) was modified with 3,4-dihydroxyphenylalanine and glycidyl methacylate, then introduced into the acrylic acid- co -acrylamide hydrogel matrix with robust mechanical properties. The hydrogel bandage showed strong chemical linkage adhesion (70 ± 2.1 kPa), which is 2.8 times that of commercial tissue adhesive fibrin glue (25 ± 2.2 kPa). The hydrogel bandage can not only maintain the self-stability, but is also capable of self-tuning adhesive strength in the range of 14–70 kPa to achieve different adhesion effects by tuning constituent ratio. The bandage has desirable compression properties (0.7 ± 0.11 MPa) and tensile elongation (about 25 times), which ensures its resistance to damages, especially in joint spaces. Secondly, the bandage was endowed with antioxidant and endogenous broad-spectrum antibacterial properties with its catechol structure. Results also demonstrated excellent cell compatibility and blood compatibility, certifying its eligible biological safety profile. In a rat full-thickness cutaneous deficiency model, we can clearly observe that the bandage possesses the ability to promote wound healing (only need 6 days). Above all, this research provides a new strategy for the emergency treatment of liver hemostasis and myocardial repair during disaster rescue. Supplementary information Experimental details and supporting data are available in the online version of the paper10.1007/s40843-021-1724-8.

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Anisotropic nanocomposite hydrogels with enhanced actuating performance through aligned polymer networks

Cited by 38 publications

References 65 publications

Sub‐Nanometer Nanobelts Based on Titanium Dioxide/Zirconium Dioxide–Polyoxometalate Heterostructures

Sub‐Nanometer Nanobelts Based on Titanium Dioxide/Zirconium Dioxide–Polyoxometalate Heterostructures

Comparative study of robotic artificial actuators and biological muscle

Bio-inspired hydrogel-based bandage with robust adhesive and antibacterial abilities for skin closure

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