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

Highly flexible and transparent dielectric elastomer actuators using silver nanowire and carbon nanotube hybrid electrodes

Soft Matter ◽  
2017 ◽  
Vol 13 (37) ◽  
pp. 6390-6395 ◽  
Author(s):  
Ye Rim Lee ◽  
Hyungho Kwon ◽  
Do Hoon Lee ◽  
Byung Yang Lee
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Silver Nanowires ◽  
Dielectric Elastomer ◽  
Silver Nanowire ◽  
Dielectric Elastomer Actuator ◽  
Dielectric Elastomer Actuators ◽  
Transparent Dielectric ◽  
Optically Transparent ◽  
Highly Stretchable

Electrodes consisting of silver nanowires and carbon nanotubes enable a dielectric elastomer actuator to become highly stretchable and optically transparent.

scholarly journals Linear-Quadratic Regulator for Control of Multi-Wall Carbon Nanotube/Polydimethylsiloxane Based Conical Dielectric Elastomer Actuators

Actuators ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 18
Author(s):  
Titus Mulembo ◽  
Waweru Njeri ◽  
Gakuji Nagai ◽  
Hirohisa Tamagawa ◽  
Keishi Naito ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Rise Time ◽  
Electromechanical Coupling ◽  
Linear Quadratic Regulator ◽  
Fast Response ◽  
Dielectric Elastomer ◽  
Soft Robotics ◽  
Artificial Muscles ◽  
Linear Quadratic ◽  
Dielectric Elastomer Actuators

Conventional rigid actuators, such as DC servo motors, face challenges in utilizing them in artificial muscles and soft robotics. Dielectric elastomer actuators (DEAs) overcome all these limitations, as they exhibit complex and fast motions, quietness, lightness, and softness. Recently, there has been much focus on studies of the DEAs material’s non-linearity, the non-linear electromechanical coupling, and viscoelastic behavior of VHB and silicone-based conical DEAs having compliant electrodes that are based on graphite powder and carbon grease. However, the mitigation of overshoot that arises from fast response conical DEAs made with solid electrodes has not received much research focus. In this paper, we fabricated a conical configuration of multi-walled carbon nanotube/polydimethylsiloxane (MWCNT/PDMS) based DEAs with a rise time of 10 ms, and 50% peak overshoot. We developed a full feedback state-based linear-quadratic regulator (LQR) having Luenberger observer to mitigate the DEAs overshoot in both the voltage ON and OFF instances. The cone DEA’s model was identified and a stable and well-fitting transfer function with a fit of 94% was obtained. Optimal parameters Q = 70,000, R = 0.1, and Q = 7000, R = 0.01 resulted in the DEA response having a rise time value of 20 ms with zero overshoot, in both simulations and experiments. The LQR approach can be useful for the control of fast response DEAs and this would expand the potential use of the DEAs as artificial muscles in soft robotics.

Enhanced anisotropic response of dielectric elastomer actuators with microcombed and etched carbon nanotube sheet electrodes

Carbon ◽  
2017 ◽  
Vol 120 ◽  
pp. 366-373 ◽  
Author(s):  
Xiaomeng Fang ◽  
Ang Li ◽  
Ozkan Yildiz ◽  
Huiqi Shao ◽  
Philip D. Bradford ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Dielectric Elastomer ◽  
Dielectric Elastomer Actuators

Fault-Tolerant Dielectric Elastomer Actuators using Single-Walled Carbon Nanotube Electrodes

2008 ◽  
Vol 20 (3) ◽  
pp. 621-625 ◽  
Author(s):  
W. Yuan ◽  
L. B. Hu ◽  
Z. B. Yu ◽  
T. Lam ◽  
J. Biggs ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Fault Tolerant ◽  
Dielectric Elastomer ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Dielectric Elastomer Actuators

scholarly journals Dielectric Elastomer Actuators with Carbon Nanotube Electrodes Painted with a Soft Brush

Actuators ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 51 ◽  
Author(s):  
Hiroki Shigemune ◽  
Shigeki Sugano ◽  
Jun Nishitani ◽  
Masayuki Yamauchi ◽  
Naoki Hosoya ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Electronic Properties ◽  
Large Deformation ◽  
Dielectric Elastomer ◽  
Dielectric Elastomer Actuator ◽  
Dielectric Elastomer Actuators ◽  
Multiple Trials

We propose a simple methodology to paint carbon nanotube (CNT) powder with a soft brush onto an elastomer. A large deformation of dielectric elastomer actuator (DEA) occurs according to the small constraint of the electrodes. Uniform painting with a soft brush leads to a stable deformation, as demonstrated by the results of multiple trials. Unexpectedly, painting with a soft brush results in aligned materials on the elastomer. The oriented materials demonstrate anisotropic mechanical and electronic properties. This simple methodology should help realize innovative DEA applications.

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.

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