Dielectric Elastomers

Chiba, Seiki

doi:10.1007/978-981-13-6850-9_14

Cited by 3 publications

(3 citation statements)

References 19 publications

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“… Responds to very high voltages (1‐10 kV). Also vulnerable to dielectric breakdown at high voltages. Very high strain (>300% [ 4 ] ) at high strain rate (>100% s ‐1 [ 244 ] ). Capable of very high frequencies (>10 kHz [ 244 ] ). Medium work density (150 kJ m −3 [ 5,245 ] ) High power density (≈500‐1000 W kg −1 [ 246,247 ] ). High cycle life (10 6 at 50% strain, VHB [ 9 ] ) …”

Section: Design Principles: From Surface Tension To Actuationmentioning

confidence: 99%

Liquid Metal Actuators: A Comparative Analysis of Surface Tension Controlled Actuation

2023

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Liquid metals, with their unique combination of electrical and mechanical properties, offer great opportunities for actuation based on surface tension modulation. Thanks to the scaling laws of surface tension, which can be electrochemically controlled at low voltages, liquid metal actuators stand out from other soft actuators for their remarkable characteristics such as high contractile strain rates and higher work densities at smaller length scales. This review summarizes the principles of liquid metal actuators and discusses their performance as well as theoretical pathways towards higher performances. The objective is to provide a comparative analysis of the ongoing development of liquid metal actuators. We analyze the design principles of the liquid metal actuators, including low‐level elemental principles (kinematics and electrochemistry), mid‐level structural principles (reversibility, integrity, and scalability), and high‐level functionalities. We review a wide range of practical use cases of liquid metal actuators from robotic locomotion and object manipulation to logic and computation. From an energy perspective, strategies are compared for coupling the liquid metal actuators with an energy source towards fully untethered robots. The review concludes by offering a roadmap of future research directions of liquid metal actuators.This article is protected by copyright. All rights reserved

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Section: Design Principles: From Surface Tension To Actuationmentioning

confidence: 99%

Liquid Metal Actuators: A Comparative Analysis of Surface Tension Controlled Actuation

2023

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“…Dielectric elastomer is an electro-active polymer (EAP) capable of being polarized and changing its size and shape under the applied electric field and is the main functional element in such applications [2][3][4]. This performs by electrically driven mass transport of ions or electrically charged species in polymer [5]. The active study of the filled cross-linked systems behavior under various external conditions began in the 80s of the 20th centuries, and in the 1990s, the main approaches were already formulated, in particular, to the implementation of the concept of creating artificial muscles using dielectric elastomers [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Among the polymers that can be used are, for example, fluoropolymers, polyacrylates, polyurethanes, and silicones [2,[9][10][11]. Silicone elastomers have a number of features such as a wide range of mechanical properties regulation, a long exploitation period, a wide range of operating temperatures, biostability, formability [12], as well as high response speed and energy density [13], relatively low dielectric and mechanical losses [5]. This defines their use as dielectric elastomers in actuators.…”

Section: Introductionmentioning

confidence: 99%

Thioether-Containing Zirconium(Alkoxy)Siloxanes: Synthesis and Study of Dielectric and Mechanical Properties of Silica-Filled Polydimethylsiloxane Compositions Cured by Them

et al. 2023

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A number of thioether-containing zirconium siloxanes, differing in their composition and metal atom shielding degree with a siloxy substituent, were synthesized and characterized. Synthesis of such compounds made it possible to evaluate the effect of sulfur atoms’ presence in the cured compositions on their dielectric properties, as well as to evaluate their curing ability and influence on mechanical characteristics compared to the sulfur-free analogs obtained earlier. Studying a wide range of compositions differing in their content and ratio of metallosiloxane and silica components revealed that such systems are still typical dielectrics. At the same time, the introduction of thioether groups can provide increased dielectric constant and conductivity in comparison with previously obtained sulfur-free similar compositions in the <102 Hz frequency range (dielectric constant up to ~10–30 at frequency range 1–10 Hz). As before, the dielectric parameters increase is directly determined by the silica component proportion in the cured material. It is also shown that varying sulfur-containing zirconium siloxanes structure and functionality and its combination with previously obtained sulfur–free analogs, along with varying the functionality and rubber chain length, can be an effective tool for changing the dielectric and mechanical material parameters in a wide range (tensile strength 0.5–7 Mpa, elastic deformation 2–300%), which determine the prospects for the use of such cured systems as dielectric elastomers for various purposes.

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Perspective Chapter: Improvement of Elastomer Elongation and Output for Dielectric Elastomers

Chiba¹,

Waki²,

Zhu³

et al. 2023

Elasticity of Materials

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The need for light, high-strength, and artificial muscles is growing rapidly. A well-known type of artificial muscle meeting these requirements is the dielectric elastic (DE) type, which uses electrostatic force between electrodes. In hopes of utilizing, it practically for a variety of purposes, research and development is rapidly progressing all over the world as a technology for practical use. Much of the market demand is dominated by more output-focused applications such as DE power suits, DE motors, DE muscles for robots, and larger DE power systems. To meet these demands, the elasticity of the elastomer is very important. In this paper, we discussed what the important factors are for SS curves, viscoelasticity tests, etc. of the dielectric elastomer materials. Recent attempts have been also made to use new carbon foam materials such as SWCNTs and MWCNTs as electrodes for DEs. These electrodes bring the elastomers to a higher level of performance.

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Dielectric Elastomers

Cited by 3 publications

References 19 publications

Liquid Metal Actuators: A Comparative Analysis of Surface Tension Controlled Actuation

Liquid Metal Actuators: A Comparative Analysis of Surface Tension Controlled Actuation

Thioether-Containing Zirconium(Alkoxy)Siloxanes: Synthesis and Study of Dielectric and Mechanical Properties of Silica-Filled Polydimethylsiloxane Compositions Cured by Them

Perspective Chapter: Improvement of Elastomer Elongation and Output for Dielectric Elastomers

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