Dataset Information

Actuator Performance of a Hydrogenated Carboxylated Acrylonitrile-Butadiene Rubber/Silica-Coated BaTiO₃ Dielectric Elastomer.

ABSTRACT: We synthesized silica-coated barium titanate (BaTiO₃) particles with different silica shell thicknesses and evaluated the effect of silica coating on the relative dielectric properties of silica-coated BaTiO₃ particles. Furthermore, composite elastomers were prepared using hydrogenated carboxylated acrylonitrile-butadiene rubber (HXNBR) with a high relative dielectric constant (?_r) and silica-coated BaTiO₃ particles, and their performance as an actuator was evaluated. Both ?_r and relative dielectric loss of non-coated BaTiO₃ particles increased at low frequencies (<200 Hz) associated with ionic conduction. However, ?_r and relative dielectric loss were reduced for the silica-coated BaTiO₃ particles with thick silica shells, indicating that silica coating reduced ion migration. The dielectric breakdown strength increased with the thickness of the silica shell; it increased up to 80 V/?m for HXNBR/silica-coated BaTiO₃ particles with 20 nm-thick silica shells. The maximum generated stress, strain, and output energy density of the composite elastomer with HXNBR (with a high relative constant) and silica-coated BaTiO₃ were 1.0 MPa, 7.7%, and 19.4 kJ/m³, respectively. In contrast, the values of the same parameters for a reference elastomer (acrylic/BaTiO₃; with low ?_r) were 0.4 MPa, 6.7%, and 6.8 kJ/m³ at the dielectric breakdown strength of 70 V/?m. The results indicated that the elastomers composed of HXNBR and silica-coated BaTiO₃ exhibited higher generated stress, strain, and output energy density than elastomers for conventional dielectric actuators.

SUBMITTER: Matsuno R

PROVIDER: S-EPMC7807772 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Actuator Performance of a Hydrogenated Carboxylated Acrylonitrile-Butadiene Rubber/Silica-Coated BaTiO3 Dielectric Elastomer.

Matsuno Ryosuke R Ito Takamasa T Takamatsu Shigeaki S Takahara Atsushi A

ACS omega 20201224 1

We synthesized silica-coated barium titanate (BaTiO3) particles with different silica shell thicknesses and evaluated the effect of silica coating on the relative dielectric properties of silica-coated BaTiO3 particles. Furthermore, composite elastomers were prepared using hydrogenated carboxylated acrylonitrile-butadiene rubber (HXNBR) with a high relative dielectric constant (εr) and silica-coated BaTiO3 particles, and their performance as an actuato ...[more]

PMID: 33458517

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Project description:Natural motion types found in skeletal and muscular systems of vertebrate animals inspire researchers to transfer this ability into engineered motion, which is highly desired in robotic systems. Dielectric elastomer actuators (DEAs) have shown promising capabilities as artificial muscles for driving such structures, as they are soft, lightweight, and can generate large strokes. For maximum performance, dielectric elastomer membranes need to be sufficiently pre-stretched. This fact is challenging, because it is difficult to integrate pre-stretched membranes into entirely soft systems, since the stored strain energy can significantly deform soft elements. Here, we present a soft robotic structure, possessing a bioinspired skeleton integrated into a soft body element, driven by an antagonistic pair of DEA artificial muscles, that enable the robot bending. In its equilibrium state, the setup maintains optimum isotropic pre-stretch. The robot itself has a length of 60 mm and is based on a flexible silicone body, possessing embedded transverse 3D printed struts. These rigid bone-like elements lead to an anisotropic bending stiffness, which only allows bending in one plane while maintaining the DEA's necessary pre-stretch in the other planes. The bones, therefore, define the degrees of freedom and stabilize the system. The DEAs are manufactured by aerosol deposition of a carbon-silicone-composite ink onto a stretchable membrane that is heat cured. Afterwards, the actuators are bonded to the top and bottom of the silicone body. The robotic structure shows large and defined bimorph bending curvature and operates in static as well as dynamic motion. Our experiments describe the influence of membrane pre-stretch and varied stiffness of the silicone body on the static and dynamic bending displacement, resonance frequencies and blocking forces. We also present an analytical model based on the Classical Laminate Theory for the identification of the main influencing parameters. Due to the simple design and processing, our new concept of a bioinspired DEA based robotic structure, with skeletal and muscular reinforcement, offers a wide range of robotic application.

Dataset Information

Actuator Performance of a Hydrogenated Carboxylated Acrylonitrile-Butadiene Rubber/Silica-Coated BaTiO₃ Dielectric Elastomer.

Publications

Actuator Performance of a Hydrogenated Carboxylated Acrylonitrile-Butadiene Rubber/Silica-Coated BaTiO<sub>3</sub> Dielectric Elastomer.

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