A Photoactivated Artificial Muscle Model Unit: Reversible, Photoinduced Sliding of Nanosheets

Nabetani, Yu; Takamura, Hazuki; Hayasaka, Yuika; Shimada, Takahiro; Takagi, Shinsuke; Tachibana, Hiroshi; Masui, Dai; Tong, Zhiwei; Inoue, Haruo

doi:10.1021/ja207278t

Cited by 54 publications

(48 citation statements)

References 17 publications

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“…Morphological change in the C3F-Azo-layered niobate hybrid film with response to light irradiation has been reported [175]. Right side of Figure 8 shows an AFM image of the C3F-Azo-layered niobate film, The dye orientation (with the molecular long axis inclined to the silicate layer) plays an important role in the photoinduced intercalation of phenol; the phenol intercalation before the irradiation is prerequiste to induce the photoresponsed intercalation [178].…”

Section: When a Cationic Azo Dye P-[2-(2-hydroxyethyldimethylammoniomentioning

confidence: 82%

Photochromic Intercalation Compounds

Okada

Sohmiya

Ogawa

2015

Photofunctional Layered Materials

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Section: When a Cationic Azo Dye P-[2-(2-hydroxyethyldimethylammoniomentioning

confidence: 82%

Photochromic Intercalation Compounds

Okada

Sohmiya

Ogawa

2015

Photofunctional Layered Materials

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“…A variety of electronic, ionic, and photoactivated artificial muscle technologies have emerged in recent years [12]- [13]. We think the ideal characteristics of artificial muscles should approximate the characteristics of human muscle which has a contraction rate of 20%~30%, a pressure of 0.1~0.3MPa and a response rate of 10Hz [14].…”

Section: Pvc Gel Artificial Musclesmentioning

confidence: 99%

A proposal of a light-weight walking assist wear using PVC gel artificial muscles

Hashimoto

2015

2015 IEEE International Conference on Robotics and Automation (ICRA)

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We have developed a contraction and expansion-type artificial muscle by using the plasticized polyvinyl chloride (PVC) gel and mesh electrodes. The PVC gel artificial muscle exhibits a fast response in air, large deformation, variable stiffness, high output force and low power consumption under an electrical field, so it has a great potential to use as a new type of artificial muscles. In a previous study, we designed variable stiffness spats for walking assistance by incorporating the variable stiffness PVC gel artificial muscles with the generally used spats. The spats can assist walking by the generation force of the variation of stiffness with the on and off switching of an electric field. It was found that both the integrated electromyogram (IEMG) and maximal voluntary contraction (%MVC) of the rectus femoris muscle decreased during the walking when wearing the variable stiffness gel spats which showed that it was possible to use the PVC gel artificial muscles for walking assistance. However, the variable stiffness spats has small generation force and lower robustness to external forces. In this study, we propose a novel approach to make a high-performance light-weight walking assist wear using the PVC gel artificial muscles. We use the contraction-expansion output force for motion assist to get a bigger generation force. An expansion type structure unit is introduced to make the assist wear more robust to external forces. Insole force sensors are used to detect the gait changes during walking. The proposed walking assist wear has the characteristics of a simple structure, light weight, easy to put on and take off and with a high flexibility. In this paper, the framework involving the proposed walking assist wear is described in detail.

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“…Gels and liquid-crystal elastomers are capable of actuation at the macroscopic level. [3,4] Particularly,d ynamic molecular crystalsh ave emerged as an ew platform to achieve rapid energy transformation through dense and ordered crystalline lattice packing owing to low energy dissipation and enhanced coupling between light and mechanical energy. [5] Some molecularc rystals formed from photochemically active compounds showed interesting light-induced bending, [6] curling, [7] twisting, [8] spinning, leaping,b lasting, [9] crawling, [10] and salient.…”

Section: Introductionmentioning

confidence: 99%

Light‐Induced Bending of Needle‐Like Crystals of Naphthylvinylbenzoxazole Triggered by trans–cis Isomerization

Peng

Zhao

et al. 2018

Chemistry An Asian Journal

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New diarylethene derivatives containing benzoxazole (NBO) and benzothiazole (NBT) have been synthesized. Light-induced trans-cis isomerization of NBO and NBT took place in crystals, and only induced the needle-like crystals of NBO to bend backwards away from the UV light source. The movement of the atoms was deemed to take place during the isomerization of NBO; hence, strain would be produced and accumulated rapidly in the surface of crystals exposed to UV light. The uniform release of strain led to the bending of needle-like crystals. The light-induced trans-cis isomerization efficiency of NBT was too low to drive the motion of crystals, which might have originated from the large repulsion between naphthyl and benzothiazole. These results provide a new platform for the transformation of light energy into mechanical energy in molecular crystals through the unimolecular photochemical reaction of diarylethene derivatives.

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A Photoactivated Artificial Muscle Model Unit: Reversible, Photoinduced Sliding of Nanosheets

Cited by 54 publications

References 17 publications

Photochromic Intercalation Compounds

Photochromic Intercalation Compounds

A proposal of a light-weight walking assist wear using PVC gel artificial muscles

Light‐Induced Bending of Needle‐Like Crystals of Naphthylvinylbenzoxazole Triggered by trans–cis Isomerization

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