Near‐Infrared Light Triggered Soft Actuators in Aqueous Media Prepared from Shape‐Memory Polymer Composites

Fang, Liang; Fang, Tianyu; Liu, Xiaoxia; Chen, Shun-Ping; Lu, Chunhua; Xu, Zhongzi

doi:10.1002/mame.201600139

Cited by 28 publications

(12 citation statements)

References 34 publications

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“…As shown in Figure b, photothermal efficiency which is defined as the slope value by fitting the relation between the balanced temperature and PD in a linear manner no longer increased after introducing 0.2 phr AB. The similar result was also observed in EVA/AB composite system, where a high amount of 2 phr AB was required to retard the further increase in photothermal effect due to the worse dispersion …”

Section: Resultssupporting

confidence: 76%

“…In comparison, large aggregates of carbon black with the same loading existed in the same epoxy coatings (Figure c). Besides, as reported previously, large AB aggregates were observed in another polymer system of poly[ethylene‐ ran ‐(vinyl acetate)] (EVA) . The comparison among such three systems indicates the unique well dispersion of AB in epoxy coatings.…”

Section: Resultssupporting

confidence: 74%

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Self‐Healing Epoxy Coatings via Focused Sunlight Based on Photothermal Effect

Fang

Chen

Zou

et al. 2017

Macro Materials & Eng

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Epoxy coatings which can be healed via photothermal effect from focused sunlight are reported. The diamine of m‐xylylenediamine (MXDA) and monoamine of 4‐(heptadecafluorooctyl)aniline (HFOA) are reacted into the diglycidylether of bisphenol A (DGEBA) network. Via gradual replacement of MXDA with HFOA, the glass transition temperature and crosslinking density of the epoxy network are tuned to achieve the thermally induced healing based on chain diffusion and reentanglement. Aniline black (AB) with well absorptivity for sunlight is used subsequently as the organic photothermal compound, transferring the thermally induced healing into a sunlight responsive one. A common handheld magnifier, which can focus natural sunlight to the required power density (0.6–0.9 W cm−1), is used to successfully heal one cracked coating in outdoor circumstance. This study provides a potential approach to achieve the convenient, precise, and timely healing for outdoor epoxy coatings.

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Section: Resultssupporting

confidence: 76%

Section: Resultssupporting

confidence: 74%

Self‐Healing Epoxy Coatings via Focused Sunlight Based on Photothermal Effect

Fang

Chen

Zou

et al. 2017

Macro Materials & Eng

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“…Their experimental research showed that the flexible gripper made by SMPAs could grasp a variety of irregular or fragile objects, and could achieve high-precision control. Fang et al [11] mixed ethylene-vinyl acetate and aniline black to provide one candidate material for near-infrared light triggered flexible actuator in aqueous media, and demonstrated the SMPA made by this new material was capable of opening and closing the arms reversibly via periodic variation in irradiation PD successfully. SMPA is suitable for small volume, simple in structure, easy to control, and strong adaptability to the environment [12,13].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Experiment Study on Deformation Characteristics of the Water Hydraulic Flexible Actuator Used for the Underwater Gripper

Nie

Liu

et al. 2020

IEEE Access

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A water hydraulic flexible gripper with three-fingered structure is developed to deal with the problem of poor adaptability for the existing underwater gripper. This gripper driven by water hydraulics can realize flexible grasping and possess simple structure, high pressure-bearing, strong adaptability and capability of anti-jamming to the water environment and easy to control. In particular, the water hydraulic flexible gripper system is an open system in relation to the underwater environment, with the water source being supplied directly by the underwater environment, eliminating the effects of back pressure generated by the underwater environment in comparison with the closed system of other grippers. It is a good solution to solve the problem of poor adaptability for the existing underwater gripper in underwater environment. The flexible actuator model is established to explore the key parameters influencing the deformation characteristics. The effects of different inlet pressure, knuckle length, wall thickness and material of the inner skeleton and external surface on the deformation characteristics of the flexible actuator are investigated through simulation. It is found that, for the flexible actuator, the wall thickness of the inner skeleton is selected as 1 mm and the inner skeleton length is designed with the first knuckle of 30 mm and the second knuckle of 80 mm. Based on the optimal parameters obtained through simulation, the prototype of flexible actuator and flexible gripper are fabricated. Experiment is performed to test the deformation of the flexible actuator under different inlet pressure. It is found that the experiment results are consistent with the simulation results. Both of the experiment and simulation results exhibit that the total deformation of the flexible actuator is proportional to the inlet pressure. The research will lay foundation for the optimal design of flexible actuator used for the underwater gripper driven by water hydraulics.

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“…Shape memory actuators are another type of soft actuators that have been developed by researchers [14], [15]. A shapememory alloy (SMA) is an alloy that can be deformed when cold but returns to its pre-deformed ("remembered") shape when heated.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of a Novel Networked Electromagnetic Soft Actuators System Based on Branch and Bound Algorithm

et al. 2020

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This paper presents a design optimization framework based on Branch and Bound Algorithm for novel networked electromagnetic soft actuators. The soft actuators work based on the operating principle of solenoids but are made of intrinsically soft materials. We confirmed that by scaling down the size of the soft actuators, their force to volume ratio increases. This suggests that by miniaturizing the actuators size and attaching them as a network based on the arrangement of actin and myosin filaments in skeletal muscles, the output force can be enhanced. In order to achieve the maximum output force, design parameters of a single soft actuator as well as those of a network are considered as design variables. The maximum available volume (thickness, width and length) and deflection range of the network are considered design constraints. The cost function, i.e. the output force is a non-linear mixed-integer function. A Branch and Bound optimization algorithm based on interval analysis is then proposed to solve the optimization problem. Numerical simulations are presented for a representative example of an active soft brace for the human elbow joint. The results suggest that an electromagnetic soft actuator network can provide sufficient torque to be used as a drive train for an active elbow brace for both flexion and extension over a range of around 93 degrees.

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Near‐Infrared Light Triggered Soft Actuators in Aqueous Media Prepared from Shape‐Memory Polymer Composites

Cited by 28 publications

References 34 publications

Self‐Healing Epoxy Coatings via Focused Sunlight Based on Photothermal Effect

Self‐Healing Epoxy Coatings via Focused Sunlight Based on Photothermal Effect

Simulation and Experiment Study on Deformation Characteristics of the Water Hydraulic Flexible Actuator Used for the Underwater Gripper

Design Optimization of a Novel Networked Electromagnetic Soft Actuators System Based on Branch and Bound Algorithm

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