scholarly journals Effects of Ferroelectric Fillers on Composite Dielectric Elastomer Actuator

Actuators ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 137
Author(s):  
Stanislav Sikulskyi ◽  
Danayit T. Mekonnen ◽  
Abdullah El Atrache ◽  
Eduardo Divo ◽  
Daewon Kim
Keyword(s):  
Dielectric Permittivity ◽  
Breakdown Strength ◽  
Dielectric Elastomer ◽  
Particle Loading ◽  
Comprehensive Understanding ◽  
Figures Of Merit ◽  
Dielectric Elastomer Actuators ◽  
Calcium Copper Titanate ◽  
Improved Performance ◽  
Composite Properties

Integrating nano- to micro-sized dielectric fillers to elastomer matrices to form dielectric composites is one of the commonly utilized methods to improve the performance of dielectric elastomer actuators (DEAs). Barium titanate (BaTiO3) is among the widely used ferroelectric fillers for this purpose; however, calcium copper titanate CaCu3Ti4O12 (CCTO) has the potential to outperform such conventional fillers. Despite their promising performance, CCTO-based dielectric composites for DEA application are studied to a relatively lower degree. Particularly, the composites are characterized for a comparably small particle loading range, while critical DEA properties such as breakdown strength and nonlinear elasticity are barely addressed in the literature. Thus, in this study, CCTO was paired with polydimethylsiloxane (CH3)3SiO[Si(CH3)2O]nSi(CH3)3 (PDMS), Sylgard 184, to gain a comprehensive understanding of the effects of particle loading and size on the dielectric composite properties important for DEA applications. The dielectric composites’ performance was described through the figures of merit (FOMs) that consider materials’ Young’s modulus, dielectric permittivity, and breakdown strength. The optimum amounts of the ferroelectric filler were determined through the FOMs to maximize composite DEA performance. Lastly, electromechanical testing of the pre-stretched CCTO-composite DEA validated the improved performance over the plain elastomer DEA, with deviations from prediction attributed to the studied composites’ nonlinearity.

Preparation and properties of core-shell structured calcium copper titanate@polyaniline/silicone dielectric elastomer actuators

2017 ◽  
Vol 40 (S1) ◽  
pp. E62-E68 ◽  
Author(s):  
Yi Yang Zhang ◽  
Gen Lin Wang ◽  
Jie Zhang ◽  
Ke Hong Ding ◽  
Zhi Feng Wang ◽  
...  
Keyword(s):  
Dielectric Elastomer ◽  
Core Shell ◽  
Dielectric Elastomer Actuators ◽  
Calcium Copper Titanate

scholarly journals Dielectric elastomer actuators with increased dielectric permittivity and low leakage current capable of suppressing electromechanical instability

2018 ◽  
Vol 6 (8) ◽  
pp. 2043-2053 ◽  
Author(s):  
Philip Caspari ◽  
Simon J. Dünki ◽  
Frank A. Nüesch ◽  
Dorina M. Opris
Keyword(s):  
Dielectric Permittivity ◽  
Leakage Current ◽  
Dielectric Elastomer ◽  
Electromechanical Properties ◽  
Low Leakage ◽  
Dielectric Elastomer Actuators ◽  
Low Leakage Current ◽  
Electromechanical Instability

A dielectric elastomer with increased permittivity and excellent dielectric and electromechanical properties suitable to transducer applications was developed.

Development of Dielectric Elastomer Actuators - Part II: Preparation of the High Dielectric Constant Film Actuators Containing BaTiO3 Particles

2012 ◽  
Vol 557-559 ◽  
pp. 1869-1874 ◽  
Author(s):  
Takeshi Fukuda ◽  
Zhi Wei Luo ◽  
Aya Ito
Keyword(s):  
Particle Size ◽  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Volume Fraction ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Dielectric Elastomer ◽  
Dielectric Elastomer Actuators ◽  
Electrical Breakdown Strength ◽  
High Dielectric

Dielectric elastomer actuators with high dielectric constant and flexibility were prepared. These actuators were fabricated by the composite of barium titanate (BaTiO3) and polyester-type thermosetting polyurethane (TSU), which was molecularly-designed to become less hard segment content. In this study, the effects of particle size, volume fraction and manufacturing method of BaTiO3 were investigated. In addition, the mechanically-stretched effect in composites was also evaluated. It turned out that the electrical breakdown strength increased with the increase of particle size of BaTiO3 and in volume fraction as well as the use of BaTiO3 synthesized by the oxalate method. In addition, prestrain of composites also raised the electrical breakdown strength. However, the addition of BaTiO3 to polyurethane didn’t contribute to the actuation under a lower electric field.

Self-clearable carbon nanotube electrodes for improved performance of dielectric elastomer actuators

2008 ◽  
Author(s):  
Wei Yuan ◽  
Liangbing Hu ◽  
Soonmok Ha ◽  
Tuling Lam ◽  
George Grüner ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Dielectric Elastomer ◽  
Dielectric Elastomer Actuators ◽  
Improved Performance

scholarly journals Effects of Thinner Compliant Electrodes on Self-Clearability of Dielectric Elastomer Actuators

Actuators ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 121
Author(s):  
Gih-Keong Lau ◽  
Li-Lynn Shiau ◽  
Soo-Lim Chua
Keyword(s):  
Breakdown Strength ◽  
Dielectric Strength ◽  
Dielectric Elastomer ◽  
Thickness Effect ◽  
Substrate Thickness ◽  
Scanning Calorimetry ◽  
Electrode Coating ◽  
Dielectric Elastomer Actuators ◽  
Thin Electrode ◽  
Compliant Electrodes

A metalized plastic capacitor stands a higher chance to clear faults when embodied with thinner electrodes. However, it is not clear whether the same thickness effect applies to carbon-based compliant electrodes in clearing the defects in dielectric elastomer actuators (DEA). This experimental study showed that charcoal-powder compliant electrodes act like fuses and current limiters to successfully clear the defects of an acrylic dielectric elastomer actuator, provided a very thin electrode coating. For example, DEAs with 3 μm thick (average) charcoal-powder electrodes fast cleared faults and sustained high breakdown strength (300 to 400 MV/m), but the ones with thicker charcoal-powder electrodes (30 μm thick on average) succumbed to persisting breakdowns in a weaker electric field (200 to 300 MV/m). Thermo-gravitational analysis and differential scanning calorimetry showed that dielectric elastomer (3M VHB F9473PC) started to ignite at 350 ∘C, and charcoal powders (Mungyo charcoal pastel MP-12CP) started burning above 450 ∘C. This confirmed that flash ignition and its damping of charcoal powder is possible only with a very thin electrode coating relative to acrylic elastomer substrate thickness. Too thick of a charcoal-powder coating could lead to the spread of burning beyond the initial flash point, and incomplete burning that punctures the dielectric layer but shorts across opposite electrodes. With this insight, one can design self-clearable electrodes to improve the dielectric strength of dielectric elastomer actuators.

Development of Dielectric Elastomer Actuators - Part I: Performance of Polyurethane Film Actuators with Dangling Chains and Network Structures

2012 ◽  
Vol 557-559 ◽  
pp. 1852-1856 ◽  
Author(s):  
Takeshi Fukuda ◽  
Zhi Wei Luo ◽  
Aya Ito
Keyword(s):  
Electric Field ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Dielectric Elastomer ◽  
Toluene Diisocyanate ◽  
Polypropylene Glycol ◽  
Dielectric Elastomer Actuators ◽  
Polyurethane Film ◽  
Electrical Breakdown Strength ◽  
Lower Electric Field

Dielectric elastomer actuators with enhanced flexibility were prepared by thermosetting polyurethane (TSU) consisting of polypropylene glycol (PPG) as an active hydrogen component and toluene diisocyanate (TDI) as an isocyanate component. The improvement was achieved by less hard segment content, i.e. less isocyanate index, the synthesized film actuators were compared with the actuator softened using a plasticizer. It was found that the film actuators prepared by this method had significant advantages in actuation under a lower electric field as well as the increase of electrical breakdown strength and of strain. Furthermore, the mechanically-stretched effect of the films was also evaluated. It turned out that prestrain up to 200% was effective in the increase of electrical breakdown strength while maintaining the actuation under a lower electric field. However, prestrain over 200% caused a decrease in actuation under a lower electric field.

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