Twisted and coiled bamboo artificial muscles for moisture responsive torsional and tensile actuation*

Hu, Xiaoyu; Leng, Xueqi; Jia, Tianjiao; Liu, Zunfeng

doi:10.1088/1674-1056/abbbda

Cited by 20 publications

(21 citation statements)

References 26 publications

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“…Similar vapor absorption behavior was observed for the PIQA/CNS film (Figure S16, Supporting Information). Such a change could be attributed to the solvent‐induced crystallinity change, following solvent uptake; it is similar to the changes that were observed in silk, [ 45 ] bamboo, [ 46 ] and cotton fibers. [ 47 ]…”

Section: Resultssupporting

confidence: 70%

“…Similar vapor absorption behavior was observed for the PIQA/ CNS film (Figure S16, Supporting Information). Such a change could be attributed to the solvent-induced crystallinity change, following solvent uptake; it is similar to the changes that were observed in silk, [45] bamboo, [46] and cotton fibers. [47] Following the removal of the CH 2 Cl 2 vapor, the PIQA film sharply recovered the broad peak at 19.8°, demonstrating the good reversibilities of the absorption and desorption of CH 2 Cl 2 in the PIQA film (Figure 2e,f).…”

Section: Vapor Absorption Properties Of Piqa and Piqa/cnssupporting

confidence: 76%

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Robust Jumping Actuator with a Shrimp‐Shell Architecture

Yuan

et al. 2021

Advanced Materials

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In recent years, significant progresses have been recorded in the development of soft actuators regarding the material and structural designs. [11,[13][14][15][16][17] Improved actuation speed was obtained by decreasing the response time of volume change; [9][10][11][18][19][20] and enhanced actuation force was realized by increasing the rigidity of the actuator material; [19,[21][22][23][24][25][26] and increased bending curvature was achieved by increasing the asymmetric volume change. [27,28] For example, fast response can be realized employing the following strategies, for example, by increasing absorption/desorption of vapor molecules by the actuator film, [18][19][20] or by increasing the shrinking of the film by photothermal-induced water-desorption, [9,10] or by increasing polymer volume expansion via the photothermal effect of carbon nanomaterials. [11] The bimorph actuators fabricated from soft materials (e.g., elastomers and hydrogels) commonly exhibit a larger bending curvature, [29][30][31] but lower actuation force and response rate compared with those fabricated from rigid materials. Contrarily, the rigidmaterial-based actuators can generate relatively faster actuation speed and larger force, [16,21,25] but smaller bending curvature compared to those fabricated from soft materials. Therefore, it is challenging to simultaneously achieve high actuation force and large bending curvature within a short response time.Until now, there are only a few successful designs of thinfilm jumping actuators by different delicate approaches. [9][10][11][12] Aida group reported a π-stacked carbon nitride polymer (CNP) thin film actuator exhibiting a tough, ultra-lightweight and highly anisotropic layered structure, which responded to the adsorption and desorption of a minute amount of water and is extremely rapid (50 ms by one curl). The film can jump 10-mmhigh on light irradiation by losing the adsorbed water. [10] Wang group reported graphene oxide (GO)/CNT bilayer actuator, where the GO layer allowed fast diffusion of water molecules and the aligned CNT layer imposed constrain. The actuator showed fast response (0.08 s) with large bending curvature, which demonstrated jumping actuation under photothermal induced water desorption from the GO layer. [9] Chen and coworkers prepared a jumping actuator by mimicking flicking finger motion, employing the rolled CNT/polydimethylsiloxane (PDMS) bilayer composite. The unique combination of loosely CNT network, good photo-thermal effect of CNT, and the large difference between thermal expansion coefficient between the two layers resulted in light-induced jumping up to five times higher than its own height. [11] Cai group reported a jumping actuator by mimicking the fruit fly larva, employing CNT/ liquid crystal elastomer (LCE) bilayer composite. Under light It is highly desirable to develop compact-and robust-film jumping robots that can withstand severe conditions. Besides, the demands for strong actuation force, large bending curvature in a short response time, and good e...

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Section: Resultssupporting

confidence: 70%

Section: Vapor Absorption Properties Of Piqa and Piqa/cnssupporting

confidence: 76%

Robust Jumping Actuator with a Shrimp‐Shell Architecture

Yuan

et al. 2021

Advanced Materials

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“…Hydrophobic carbon nanotube (CNT) twisted yarns offered a maximal torsional moment of 0.4 Nm/kg, close to the commercial electric motor (the Aerotech model 1410-01motor) in response to water and moisture after oxygen plasma treatment [59]. Other fiber materials include bamboo [60], cotton [61], lotus [62], chitosan [63], etc. The performance of several fiber-based torsional actuators is summarized in Table 1.…”

Section: Structurementioning

confidence: 91%

“…Degummed silk fibers were twisted and wrapped around a mandrel to form tensile actuators that provided a maximum 70% contraction and peak work capacity up to 73 J/kg [57]. Other fiber materials include carbon fiber (CF)/PDMS [68], lotus [62], bamboo [60], etc. The performance of several fiber-based tensile actuators is summarized in Table 2.…”

Section: Structurementioning

confidence: 99%

Wearable Actuators: An Overview

Chen

Yang

et al. 2021

Textiles

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The booming wearable market and recent advances in material science has led to the rapid development of the various wearable sensors, actuators, and devices that can be worn, embedded in fabric, accessorized, or tattooed directly onto the skin. Wearable actuators, a subcategory of wearable technology, have attracted enormous interest from researchers in various disciplines and many wearable actuators and devices have been developed in the past few decades to assist and improve people’s everyday lives. In this paper, we review the actuation mechanisms, structures, applications, and limitations of recently developed wearable actuators including pneumatic and hydraulic actuators, shape memory alloys and polymers, thermal and hygroscopic materials, dielectric elastomers, ionic and conducting polymers, piezoelectric actuators, electromagnetic actuators, liquid crystal elastomers, etc. Examples of recent applications such as wearable soft robots, haptic devices, and personal thermal regulation textiles are highlighted. Finally, we point out the current bottleneck and suggest the prospective future research directions for wearable actuators.

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Section: Structurementioning

confidence: 91%

Wearable Actuators: An Overview

Chen¹,

Yang²,

Li³

et al. 2021

Preprint

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The booming wearable market and recent advances in material science has led to the rapid development of the various wearable sensors, actuators, and devices that can be worn, embedded in fabric or accessories, or tattoos directly onto the skin. Wearable actuators, a subcategory of wearable technology, have attracted enormous interest from researchers in various disciplines and many wearable actuators and devices have been developed in the past few decades to assist and improve people's everyday lives. In this paper, we review the actuation mechanisms, structures, applications, and limitations of recently developed wearable actuators including pneumatic and hydraulic actuators, shape memory alloys and polymers, thermal and hygroscopic materials, dielectric elastomers, ionic and conducting polymers, piezoelectric actuators, electromagnetic actuators, liquid crystal elastomers, etc. Examples of the recent applications such as wearable soft robots, haptic devices, and personal thermal regulation textiles are highlighted. Finally, we point out the current bottleneck and suggest the prospective future research directions for wearable actuators.

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Twisted and coiled bamboo artificial muscles for moisture responsive torsional and tensile actuation*

Cited by 20 publications

References 26 publications

Robust Jumping Actuator with a Shrimp‐Shell Architecture

Robust Jumping Actuator with a Shrimp‐Shell Architecture

Wearable Actuators: An Overview

Wearable Actuators: An Overview

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