Directed Motility of Hygroresponsive Biomimetic Actuators

Zhang, Youmin; Чижик, С.А.; Wen, Yunze; Naumov, Panče

doi:10.1002/adfm.201503922

Cited by 110 publications

(93 citation statements)

References 45 publications

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“…(C)湿度驱动转化为电能装置示意图. AG/LGF@AG 条带为湿度触发驱动器, 与 PVDF 组成的压电材料链接在一起, 将化学能转化为电能 [53] . (D)水蒸发驱动摆动式发动机, 将其与电磁发电机链接, 产生的电能让 LEDs 灯亮 [93] Figure 6 Design and performance of a humidity-gradient-driven generator.…”

Section: (B)湿空气靠近驱动unclassified

“…[102] . (C)加固型玻璃纤维在垂直、倾斜排列时湿度响应型驱动器的弯曲情况 [53] Figure 11 (A) Schematic diagrams of different designed G/GO fibers and their reversible deformations with changes in humidity [61] . (B) Ribbon with the molecular director at a 45° angle with respect to the long axis of the film, and the resulting curling behavior after activation in KOH solution [102] .…”

Section: (B)可形状转变的水mentioning

confidence: 99%

“…(C) Sketch of a device for humidity-to-electricity conversion [53] . (D) The evaporation-driven oscillatory engine [93] 题组在具有湿度响应的琼脂糖上排列不同取向的玻璃纤维, 制备出能调控弯曲方向的湿度响应驱动器 [53] (图 6C [54] . (B)环境湿度驱动下的自行走行为 [94] .…”

Section: (B)湿空气靠近驱动mentioning

confidence: 99%

“…(B) As the moist air reaches the actuator, the bending moment is transferred to a piezoelectric transducer, where the mechanical energy is converted into electrical energy [66] . (C) Sketch of a device for humidity-to-electricity conversion [53] . (D) The evaporation-driven oscillatory engine [93] 题组在具有湿度响应的琼脂糖上排列不同取向的玻璃纤维, 制备出能调控弯曲方向的湿度响应驱动器 [53] (图 6C [54] .…”

Section: (B)湿空气靠近驱动mentioning

confidence: 99%

“…[47] (图 1A)、小麦芒 [48] (图 1B)、芝麻 [49] [51,52] . 比如纽约大学阿布扎比分校 Naumov 课题组 [53] 模仿豆荚成熟过程中失去水分后能各向异性开裂而释放种子的特点, 利用具有湿度响应性质的琼脂糖和玻璃纤维, 制备出能图 1 自然界中植物吸水膨胀前后的形状变化. (A)豆荚 [47] , (B)小麦芒 [48] , (C)芝麻荚 [49] , (D)松果 [50] , (E)牵牛花 Figure 1 Shape changes in natural plants before and after swelling.…”

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Research Progress of Solvent-based Smart Actuator Materials

Zhang¹,

Liu²,

Chen³

et al. 2018

Acta Chim. Sinica

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Recently, smart actuator materials have drawn widespread research attention due to their important applications in soft robots, artificial muscles, sensors, or micro hand device preparation. In nature, there are many examples of actuator materials. For example, sea cucumbers can alter the stiffness of their dermis within seconds to obtain survival advantages and the venus flytrap can close their leaves in a second for efficient prey capture. Pinecones and flowers respond to their environment by opening and closing with the relative humidity changes. Inspired by these natural creatures, synthetic polymer microactuators such as polymer hydrogels and polymer composites are widely developed due to their important applications based on their response to external stimuli, such as light, heat, electronic, magnetic, solvent and humidity. In this work, we review the research progress of solvent-based smart actuator materials. There are mainly two kinds of solvent-actuator based on the fabrication method and actuator mechanism: one is a two-layer structure membrane formed by active layers-support layers with different expansion coefficients. The active layer is volumetrically expanded under the action of a solvent, and the support layer is a passive holder. The other is made of rigid material skeleton with a flexible material to make a single-layer composite membrane filler. The ionic gradient or the pore structure gradient of the material itself gives rise to the directional driving behavior with a varying solvent binding gradient. Otherwise, the membrane's bending drive behavior has been achieved by inducing a single material to form an infiltration gradient by a solvent infiltration process. Solvent-based smart actuator materials are prepared by introducing moisture or solvent-responsive molecules in a polymeric material to form a bilayers or monolayer structure. The material is distorted by volume deformation due to humidity or solvent field action. At present, a great deal of research work has been devoted to converting the mechanical deformation of solvent-based smart actuator materials into electric energy and developing related intelligent application in energy transformation, liquid switching, biomimicry, transportation of liquids and smart sensing. The paper presents a pioneering outlook for the further development of the solvent actuator materials.

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Section: (B)湿空气靠近驱动unclassified

Section: (B)可形状转变的水mentioning

confidence: 99%

Section: (B)湿空气靠近驱动mentioning

confidence: 99%

Section: (B)湿空气靠近驱动mentioning

confidence: 99%

unclassified

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Research Progress of Solvent-based Smart Actuator Materials

Zhang¹,

Liu²,

Chen³

et al. 2018

Acta Chim. Sinica

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Morphokinematics of the Hygroactuation of Feather Grass Awns

et al. 2018

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Certain awns utilize actuating mechanisms that harness energy from variations in aerial humidity to self‐burrow their seeds into the soil. Here the morphokinematics of such hygroresponse from the awn of the feather grass Stipa epilosa is described. The elongated body of the awn is typically doubly bent, and has three segments with different functionalities: the long and stiff proximal segment twists reversibly to generate thrust for burrowing the seed, the plumose and flexible distal segment contributes to aerial dispersion, and the short and stiff middle segment provides a bent geometry for effective burial. Periodic variation in humidity results in expansion and twisting of individual cells, and the collective expansion generates a torque that drives reversible twisting of the proximal and middle segments.

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A Highly Sensitive, Reversible, and Bidirectional Humidity Actuator by Calcium Carbonate Ionic Oligomers Incorporated Poly(Vinylidene Fluoride)

Kong

Guo

et al. 2021

Adv Funct Materials

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Sensitivity and multi‐directional motivation are major two factors for developing optimized humidity‐response materials, which are promising for sensing, energy production, etc. Organic functional groups are commonly used as the water sensitive units through hydrogen bond interactions with water molecules in actuators. The multi‐coordination ability of inorganic ions implies that the inorganic ionic compounds are potentially superior water sensitive units. However, the particle forms of inorganic ionic compounds produced by classical nucleation limit the number of exposed ions to interact with water. Recent progress on the inorganic ionic oligomers has broken through the limitation of classical nucleation, and realized the molecular‐scaled incorporation of inorganic ionic compounds into an organic matrix. Here, the incorporation of hydrophilic calcium carbonate ionic oligomers into hydrophobic poly(vinylidene fluoride) (PVDF) is demonstrated. The ultra‐small calcium carbonate oligomers within a PVDF film endow it with an ultra‐sensitive, reversible, and bidirectional response. The motivation ability is superior to other bidirectional humidity‐actuators at present, which realizes self‐motivation on an ice surface, converting the chemical potential energy of the humidity gradient from ice to kinetic energy.

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Directed Motility of Hygroresponsive Biomimetic Actuators

Cited by 110 publications

References 45 publications

Research Progress of Solvent-based Smart Actuator Materials

Research Progress of Solvent-based Smart Actuator Materials

Morphokinematics of the Hygroactuation of Feather Grass Awns

A Highly Sensitive, Reversible, and Bidirectional Humidity Actuator by Calcium Carbonate Ionic Oligomers Incorporated Poly(Vinylidene Fluoride)

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