Materials Horizons
·
2023
·Vol. 10
·期 8
·3140-3152
·
IF 13.3
Chao Yan,Xiangming Li,Zhengjie Yang,Xiaopei Wang,Hao Ran,Ruolin Zhang,Hongmiao Tian,Chunhui Wang,Xiaoliang Chen,Jinyou Shao
The voltage outputs of flexible piezoelectric films after bending deformation have always been limited by two factors, including the incompatible polarization direction with bending strain and the interfacial fatigue failure between the piezoelectric films and the electrode layers, largely hindering the applications in wearable electronics. Herein, we demonstrate a new piezoelectric film design, where 3D-architectured microelectrodes are fabricated inside a piezoelectric film by electrowetting-assisted printing of conductive nano-ink into the pre-formed meshed microchannels in the piezoelectric film. The 3D architectures increase the piezoelectric output of a typical P(VDF-TrFE) film by more than 7 fold compared with the conventional planar design at the same bending radius, and, more importantly, decrease the output attenuation down to only 5.3% after 10 000 bending cycles, less than one third of that for the conventional design. The dependence of piezoelectric outputs on feature sizes of 3D microelectrodes was investigated numerically and experimentally, providing a route for optimizing the 3D architecture design. Different composite piezoelectric films with internal 3D-architectured microelectrodes were fabricated, exhibiting improved piezoelectric outputs under bending deformations, demonstrating that our printing methods could have broad applications in various fields. The fabricated piezoelectric films, worn on human fingers, are used for remotely controlling the robot hand gestures by human–machine interaction; furthermore, the fabricated piezoelectric patches are used to successfully sense the pressure distribution by integrating with spacer arrays to convert the pressing movement into bending deformation, demonstrating the enormous potential of our piezoelectric films in practical applications.
研究领域:
材料科学
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电子工程
·
柔性电子技术
✓ 已验证
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Ying Huang,Haipeng Ren,Yang Liu,Weilin Xu,Wei Zhao
Knitted fabrics with easily deformable loop structure have the potential in the development of shape memory polymeric composites with large recovery deformations. The knitted fabric reinforced shape memory epoxy polymer composites (SMPC) were prepared in this work. The effects of loop densities, orientations and bending radii on shape memory properties of SMPC were investigated. The shape fixity ratio and shape recovery ratio of SMPC subjected to U-shaped bending radius of 5 mm are above 98 %. The shape recovery force of SMPC can reach up to 5.9 N. The thermodynamic properties of SMP were also characterized to obtain mechanical parameters and a user-defined material subroutine (UMAT) of shape memory epoxy polymer (SMEP) was written. Based on viscoelastic theory and the multi-scale geometrical structures, the macroscopic homogeneous thermodynamic model and mesoscopic thermodynamic model of knitted fabric reinforced SMPC were established to study the macro-scale stress distribution and meso-scale deformation evolution during shape memory process, respectively. The neutral surface position of SMPC during bending deformation is offset inner. The unique anisotropic loop structure of knitted fabric determines the shape memory behavior of the SMPC. Finally, micro-CT characterizations of knitted fabric reinforced SMPC were conducted to further understand the loop deformation mechanism during shape memory process. This study will provide important theoretical and technical support for large deformation structure design and deformation prediction of smart composites.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yonghao Chen,Meijie Qu,Chenshen Liu,Shuhui Li,Xincheng Wang,Daixuan Gong,Ping Tang,Yuezhen Bin
Humidity-driven actuators have attracted much attention from researchers due to their fast response and recovery speed, high sensitivity, and large bending deformation. Graphene oxide (GO), with abundant oxygen-containing functional groups and a large specific surface area, has been widely used in the field of flexible humidity-driven actuators. However, pure graphene oxide films have poor mechanical properties and are easily damaged in practical applications, and these limitations can be addressed by integrating GO with other materials. It has been reported that chitosan (CS) and sodium alginate (SA) can be assembled together by ultrasound to prepare CSSA nanofibers with high tensile strength and excellent hygroscopic properties. In this study, a uniform, flexible actuator based on a thin film was developed by combining graphene oxide with CSSA nanofibers. The obtained 32 μm CSSA10-GO1 film (the mass ratio of CSSA and GO is 10:1) exhibits excellent humidity-driven performance, with maximum deflection angle and driving force of 218° and 2.5 N at ΔRH = 45 %, and response and recovery times of 20.5 s and 201.8 s, respectively. In addition, the film has excellent cycle and solubility resistance stability, and the prepared film remains stable even after 50 humidity cycle tests and 7 days of immersion in water. In addition, the composite film was able to grip and lift heavy objects up to 70 times its own weight by simple design. With such excellent properties, the prepared composite film is expected to be used in soft robotics, artificial muscles and other applications.
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 13
·7898-7905
·
IF 4.036
Dongyang Yu,Yanhua Teng,He Feng,Xiuling Lin,Jianjun Li,Qingping Wang,Changguo Xue
Multi-stimuli-responsive hydrogels are intelligent materials that present advantages for application in soft devices compared with conventional machines. In this paper, we prepared a bilayer hydrogel consisting of a poly(2-(dimethylamino)ethyl methacrylate) layer and a poly(N-isopropylacrylamide) layer. The hydrogel responded to temperature, pH, NaCl, and ethanol by undergoing bending deformation. At 40 °C, it only took 23 s for the hydrogel to bend nearly 300°. Carbon black was also introduced into the hydrogel network to render it conductive. Based on its multi-stimuli-responsive properties and conductivity, the hydrogel was used to construct a 4-arm gripper, thermistor, and finger movement monitor. The time required to grip and release an object was 141 s. The resistance changed with temperature, which affected the brightness of an LED. Finger motions were monitored, and the bending angle could be distinguished.
研究领域:
材料科学
·
软体机器人
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Today
·
2022
·
IF 18.962
Xiao Yang,Yuanhao Chen,Xuan Zhang,Pan Xue,Pengfei Lv,Yanzhao Yang,Ling Wang,Wei Feng
Walking on water is a unique locomotion mode found in aquatic living creatures. However, it remains challenging to create light-driven aquatic soft robots that can walk freely on water surface. Herein, water strider-inspired water-walking soft robots that can be remotely controlled by light are demonstrated through combining superhydrophobic floating surface with hierarchical nanostructures and light-driven soft-actuation legs that are fabricated through in situ embedding of judiciously designed polymerizable miniaturized gold nanorods (MiniGNR nanomonomer) in liquid crystal network (LCN)-based soft actuators. The MiniGNRs-LCN soft actuators act as driving paddles to enable propulsive motion on the water surface, and the superhydrophobic surface facilitates the aquatic soft robots with weight-bearing and drag-reducing ability. Upon cyclic exposure to near-infrared light, the LCN-based actuation leg quickly exhibits a photoinduced shape-bending deformation, enabling the one-legged soft robot to walk on water surface unidirectionally through horizontal momentum transfer of photoinduced actuation force to the water. Taking advantage of tailorable photoresponsiveness of MiniGNR nanomonomer, a tri-legged water-walking soft robot that can execute visible/infrared wavelength-dependent multi-directional motions is further demonstrated for cargo transportation. This research may provide a new toolbox for the development of untethered soft robots with sophisticated spatiotemporal actuation toward aquatic complex environments.
研究领域:
机器人技术
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材料科学
·
纳米技术
·
生物力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jian Li,Peifeng Yu,Shuting Zhang,Zulong Wen,Yuhao Wen,Wuyi Zhou,Xianming Dong,Yingliang Liu,Yeru Liang
Flexible aqueous battery is considered to be one of the most promising energy storage devices for powering flexible electronics. However, inferior interfacial compatibility in electrode–electrolyte interfaces and inefficient ionic channel of electrolytes usually result in potential troubles when applied in practical applications. Herein, we report a mild synthetic route to a sodium lignosulfonate-polyacrylamide hydrogel electrolyte with a high adhesiveness to achieve low electrode–electrolyte interfacial resistance and fast ionic conduction. Comprehensive experiments show that the catechol groups from sodium lignosulfonate demonstrate strong interactions with both cathode and anode materials, and thus greatly reduce the contact resistances across the electrodes. Meanwhile, the existence of sulfonate groups significantly enhances the ionic conductivity of the hydrogel electrolyte. Benefiting from this design, a low ohmic resistance of 3.8 Ω ( i.e ., 11.4 Ω cm 2 ), a low charge transfer resistance of 22.5 Ω ( i.e ., 67.5 Ω cm 2 ), a high ionic conductivity of 31.1 mS cm −1 as well as a 100% capacity retention upon harsh bending deformation can be realized in the flexible zinc ion battery, which are significantly superior to those in the traditional candidates. The present investigation provides new insight into addressing the interfacial issue plaguing flexible energy storage devices.
研究领域:
材料科学
·
电化学
·
能源存储
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Xiaozhen Xiao,Guiqiang Yang,Anbei Chen,Zhiyu Zheng,Chao Zhang,Yang Zhang,Liqiong Liao
In this work, deformable and chromatic hydrogel triggered by multi-stimuli was fabricated. This hydrogel was composed of N-isopropylacrylamide (NIPAAm), acryl-6-aminocaproic acid (A6ACA), and spiropyran (SP) derivatives, which possessed ferric ion (Fe 3+ ) and temperature-triggered shape deformations properties as well as chromatic behavior. Under ultraviolet light irradiation, the SP isomer in the hydrogel transformed to the merocyanine (MC) isomer, and the hydrogel showed the characteristic UV–Vis absorption peak of MC at 540 nm. The hydrogel revealed the selective chromatic response to Fe 3+ with the disappearance of the absorption peak of MC. Using ionoprinting technology, the hydrogel deformed programmatically in the presence of Fe 3+ . Moreover, owing to the anisotropic structure of the chromatic hydrogel, it realized reversible bending deformation triggered by temperature. The behaviors of hydrogels in response to dual stimuli (Fe 3+ and temperature) were further investigated, and the hydrogel showed programmable, spatiotemporal, and complex deformation behaviors , accompanying by the color change. This hydrogel will have great application potential in soft robotics, soft actuators, and environmental sensors.
研究领域:
材料科学
·
化学
·
软体机器人
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Jinbao Li,Na Li,Huijuan Xiu,Haizhi Zhao,Yabing Wen,Xiaoyun Du,Yanbo Liang,Minzhe Wu,Evguenii Kozliak,Yun Ji
Anisotropically structured magnetic/temperature dual-response hydrogels have great application prospects as actuators because they can exhibit controlled, complex behaviors. However, one key issue hindering the application of such hydrogels is the imbalance of the mechanical and response properties. This study used a combination of flexible chain polymers such as poly(N-isopropylacrylamide) (PNIPAM), poly(vinyl alcohol) (PVA), and polyacrylamide (PAM) to build a multinetwork structure. The introduction of TEMPO-oxidized cellulose nanofibrils (TOCNF) as a nanofiber reinforcement agent led to a key improvement to ensure a high mechanical strength by creating additional hydrogen bonding. The cross-linking density was further increased through a salting out treatment to obtain a greater mechanical strength while improving the dissipation of energy applied by external sources. The obtained temperature responsive layer featured a high tensile strength (1.97 MPa) while the magnetically responsive layer showed a high magnetization (6.1 emu/g) with a good tensile strength (0.47 MPa). The main idea of this study was in combining two hydrogel layers with different polymer network structures, with magnetic nanoparticles being dispersed within one layer, whereas the other layer was designed as temperature-sensitive. The obtained bilayer hydrogel had suitable mechanical properties (the tensile strength reaching 0.81 MPa) coupled with strong dissipation of the applied external energy and could rapidly and reversibly undergo bending deformations upon a temperature change within a narrow range, 25–37 °C (bending angle up to 160° within 5 min). With high magnetization characteristics for the magnetically responsive layer, the bilayer hydrogel could easily be driven by an external magnetic field to transport a target object, which was “grabbed” due to the gel bending. It also showed good biocompatibility, thus enabling applications in the field of invasive medical actuators.
研究领域:
材料科学
·
生物医学工程
·
软体机器人
✓ 已验证
产品关联
DOI
高影响因子
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