The Effects of Moisture in Metal Oxide on the Mechanical and Electric Properties of Dielectric Elastomer Composites

2020 ◽  
Vol 981 ◽  
pp. 40-44
Author(s):  
Syed Muhammad Aiman Syed Mohd Hakhiri ◽  
Ahmad Farimin Ahmad Osman ◽  
Siti Noor Hidayah Mustapha ◽  
Lau Kwan Yiew ◽  
Shamsul Zakaria
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Metal Oxides ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Dielectric Elastomer ◽  
Pdms Film ◽  
Pdms Elastomer ◽  
Elastomer Composites ◽  
Major Factors

Dielectric elastomer (DE) technology are used in several applications for example generator, sensor and actuator. One of the major factors that limits the DE performance is premature electrical breakdown. Compositing is the example that have been reported to increase the breakdown strength. In this study polydimethylsiloxane (PDMS) film will be incorporated with two different fillers which are titanium dioxide (TiO2) and zinc oxide (ZnO). Both metal oxides will be calcined up to 300°C before they are added to the PDMS elastomer as fillers. The results show that the calcined TiO2 and ZnO that incorporated in PDMS films show significant increase of breakdown strengths. Meanwhile, the calcined TiO2 PDMS film give higher breakdown strength as comparison to the calcined ZnO counterpart.

scholarly journals Fabrication of Dielectric Elastomer Composites by Locking a Pre-Stretched Fibrous TPU Network in EVA

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1687 ◽  
Author(s):  
Liang Jiang ◽  
Yanfen Zhou ◽  
Yuhao Wang ◽  
Zhiqing Jiang ◽  
Fang Zhou ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Thermoplastic Polyurethane ◽  
Ethylene Vinyl Acetate ◽  
Tensile Tests ◽  
Dielectric Elastomer ◽  
Electromechanical Property ◽  
Electrical Breakdown Strength ◽  
Elastomer Composites

Dielectric elastomer (DE) composites with high electrical breakdown strength and large voltage-induced deformation were developed by retaining pre-stretched thermoplastic polyurethane (TPU) fibers in ethylene vinyl acetate copolymer (EVA). The microstructure of the candidate E-TPU fiber membrane and EVA coated E-TPU (E-TPU/EVA) film were characterized by scanning electron microscopy (SEM). The quasi-static and dynamic mechanical property, and the electromechanical properties, including the dielectric constant, dielectric loss tangent, and electromechanical sensitivity, of the DE composites were evaluated. Initially, tensile tests demonstrated that the DE composites based on E-TPU/EVAs had a higher elongation at break of above 1000% but a low elastic modulus of approximately 1.7 MPa. Furthermore, dielectric spectroscopy showed that the E-TPU/EVA had a dielectric constant of 4.5 at the frequency of 1000 Hz, which was 1.2 times higher than that of pure EVA film. Finally, it was found from electromechanical test that the voltage induced strain of E-TPU/EVA rose to 6%, nearly 3 times higher than that of pure TPU film, indicating an excellent electromechanical property. The DE composites developed have demonstrated the potential to be good candidate materials in the fields of artificial intelligence, biomimicry and renewable energy.

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.

A Robust Multilayer Dielectric Elastomer Actuator

2015 ◽  
Vol 1718 ◽  
pp. 145-155
Author(s):  
Mason A. Wolak ◽  
Lei Zhu
Keyword(s):  
Vinylidene Fluoride ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Layer Structure ◽  
Axial Strain ◽  
Dielectric Strength ◽  
Dielectric Elastomer ◽  
Effective Field ◽  
Electromechanical Performance ◽  
Multilayer Dielectric

ABSTRACTWe recently fabricated and characterized a new class of multilayer dielectric elastomer films comprising alternating layers of two different polymers, at least one of which is an elastomer. The films discussed here contain THV (a terpolymer of poly(vinylidene fluoride)) and poly(ethylene octene) [EO] elastomer. The multilayer structure provides improved dielectric and electromechanical performance relative to monolithic films of THV or EO. These properties are controlled by the composition and the layer structure. For example, increasing the concentration of the elastomeric EO component increases the maximum axial strain (sz). Layering EO with THV also increases the breakdown strength (EB ∼ 265 - 300 V/µm) relative to monolithic EO (EB ∼ 150 V/µm) or THV (EB ∼ 245 V/µm) control films. This enhancement in breakdown strength is consistent with a barrier effect that is also observed in multilayer polymer capacitor films. The increase in breakdown strength allows 512-layer 75 vol% EO / 25 vol% THV films to achieve maximum axial strains of sz nearly 4%, higher than can be attained by either EO or THV films alone. In addition, layering reduces remnant strain and electromechanical hysteresis by limiting the effective field within the THV layers. The 75% EO/ 25% THV films show robust operational longevity with little loss in axial strain when subjected to repeated actuation at Emax = 225 V/µm (producing sz = 2.2%). Under these conditions, we observe 3,000 consecutive actuation cycles with no electrical breakdown. In comparison, single component EO control films undergo electrical breakdown at this field and THV control films survive only a few hundred actuation cycles under these conditions. The results demonstrate that multilayering is an effective technique to increase the dielectric strength of elastomer materials and in turn improve upon strain and operational longevity (repeated actuation cycles) characteristics.

scholarly journals Remediation of Olive Mill Industry Wastewater with Titanium Dioxide (TiO2), Silisium Dioxide (SiO2) and Zinc Oxide (ZnO) Using Ultrasound

2021 ◽  
Vol 4 (2) ◽  
Keyword(s):  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Chemical Oxygen Demand ◽  
Metal Oxides ◽  
Aromatic Amines ◽  
Oxygen Demand ◽  
Total Phenol ◽  
Nanosized Tio2 ◽  
Industry Wastewater ◽  
Olive Mill

Abstract The effects of nano-sized metal oxides namely titanium dioxide (TiO2 ), silisium dioxide (SiO2 ) and zinc oxide (ZnO) on the ultrasound of olive mill effluent wastewater (OMW) in Turkey were investigated. 150 min ultrasound alone provided 61%, 50%, 61% and 66% dissolved chemical oxygen demand (CODdis), color, total phenol and total aromatic amines (TAAs) removals, respectively, at 25o C. The maximum TAAs (90%), total phenol (97%), color (94%) and CODdis (97%) removals were obtained with 5 mg/l nano-sized ZnO, 4 mg/l nano-sized TiO2 , 4 mg/l nanosized TiO2 and 4 mg/l nano- sized TiO2 , respectively, throughout ultrasound.

Estimation of Elastic Modulus of Dielectric Elastomer Materials Using Mooney-Rivlin and Ogden Models

2013 ◽  
Vol 685 ◽  
pp. 331-335 ◽  
Author(s):  
Raj Kumar Sahu ◽  
Karali Patra
Keyword(s):  
Elastic Modulus ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Electric Energy ◽  
Dielectric Elastomer ◽  
Accurate Estimation ◽  
Electrical Breakdown Strength ◽  
High Specific Energy ◽  
Predicted Values ◽  
High Dielectric

Elastomers have low elastic modulus, high specific energy density, light weight, high dielectric constant and high electrical breakdown strength. Due to these properties, elastomers are currently recognized as the future materials for actuator technology and actuators based on these materials are known as dielectric elastomer actuators (DEA). Based on Maxwell stress principle, these actuators transform electric energy directly into mechanical work. Modeling large actuation of this material depends on accurate estimation of E-modulus which varies with strain. In this work, E-modulus values at different strain are estimated based Mooney-Rivlin & Ogden Models. The model predicted values of E-modulus are compared with experimentally estimated values of E-modulus and found to be in good agreement.

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.

scholarly journals Electro-active elastomer composites based on doped titanium dioxide

2015 ◽  
Vol 3 (7) ◽  
pp. 1546-1556 ◽  
Author(s):  
Alaedine Kossi ◽  
Georges Bossis ◽  
Jacques Persello
Keyword(s):  
Titanium Dioxide ◽  
Elastic Modulus ◽  
Electric Field ◽  
Applied Electric Field ◽  
Cross Linking ◽  
High Elastic Modulus ◽  
Pdms Elastomer ◽  
Doped Titanium Dioxide ◽  
Elastomer Composites

The TiO2-Acac/PDMS elastomer conserves a high elastic modulus change (ΔG′) after cross-linking and achieves ΔG′ higher than 500 kPa for an applied electric field of 2 kV mm−1.

scholarly journals The thickness and stretch dependence of the electrical breakdown strength of an acrylic dielectric elastomer

2012 ◽  
Vol 101 (12) ◽  
pp. 122905 ◽  
Author(s):  
Jiangshui Huang ◽  
Samuel Shian ◽  
Roger M. Diebold ◽  
Zhigang Suo ◽  
David R. Clarke
Keyword(s):  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Dielectric Elastomer ◽  
Electrical Breakdown Strength
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