A Transparent Membrane for Active Noise Cancelation

Rothemund, Philipp; Morelle, Xavier; Jia, Kun; Whitesides, George M.; Suo, Zhigang

doi:10.1002/adfm.201800653

Cited by 25 publications

(25 citation statements)

References 29 publications

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“…The dynamic performance and the resonance of DEAs have been characterized both theoretically and experimentally using configurations such as pressurized DE balloons [7] [8], a DE minimum energy structure [9], spot DEAs [10] [11] [12], and pure shear DEAs [13] [14] [15]. The resonant actuation principle of DEAs has also been demonstrated in recent studies including vibrational crawling robots [16] [17], a rapid de-adhesion mechanism [18], a pneumatic pump [19] [20].…”

Section: Introductionmentioning

confidence: 99%

Power optimization of a conical dielectric elastomer actuator for resonant robotic systems

Cao

Gao

Burgess

et al. 2020

Extreme Mechanics Letters

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Insects utilize resonant actuation to amplify the flapping stroke and improve the energy efficiency. The inherent elasticity in dielectric elastomer actuators (DEAs) offers the advantage over conventional actuators of achieving resonant actuations with no additional elastic elements required. Despite that the resonant actuation of the DEAs have attracted great research interests, no optimization has been done on the output performance of resonating DEAs. In this work, a double cone DEA (DCDEA) configuration is adopted and a numerical model is developed to characterize its dynamic response. An effective power study framework is developed and the power output of the DCDEA is optimized against its pre-stretch ratios and spacer length. To demonstrate the potential exploitation of resonant DEA performance, a bioinspired flapping wing mechanism driven by the optimized DCDEA design is developed with a peak flapping stroke of 31˚ at its resonance of 30 Hz.

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Section: Introductionmentioning

confidence: 99%

Power optimization of a conical dielectric elastomer actuator for resonant robotic systems

Cao

Gao

Burgess

et al. 2020

Extreme Mechanics Letters

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“…Frame‐mounted DEA membranes and membrane stacks are geometries often explored as actuator types due to their conferral of prestrain into the materials. Evident in Figure 8c, Rothemund et al have reported the use of commercial DEAs integrated with stretchable, transparent ionic conductors based on polyacrylamide hydrogel with NaCl electrolyte for noise cancellation devices (Figure 8d) 160. This work is an extension from the fabrication of a transparent speaker (from DEA by Keplinger et al) 161.…”

Section: Dielectric Elastomersmentioning

confidence: 75%

“…Encapsulation of carbon grease electrodes has been described by La and Lau as a method to improve the contact and thermal stability of carbon grease electrodes 158. Optically transparent electrodes have also been a topic of interest, most notably the use of ionogels 159–161…”

Section: Dielectric Elastomersmentioning

confidence: 99%

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Materials as Machines

2020

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of responsive materials as machines is in robotics. The vision, leadership, and research of Bar-Cohen is seminal in both invigorating and focusing current-day research activities to develop responsive materials [2] and implement [3] them as lightweight, dexterous, and gentle (e.g., soft) robotic elements. In this spirit, this review exhaustively details the materials, the nature of their stimuli-response, and discusses considerations for their implementation in robotic systems and subsystems.Robotics is a well-established but growing field of research. Sustained progress in both performance and functionality continue to be realized in commercial robotic systems largely based on conventional materials and their integration with mechanisms. A recent example is the Atlas robot from Boston Dynamics [4] (Figure 1a). The incorporation of stimuli-responsive materials in robotics has largely focused on component-level demonstrations to extend the performance of a subsystem (such as a hand or gripper).Stimuli-responsive materials, spanning nearly all classes of materials and size scales, are currently subject to widespread examination in corporate, government, and academic research laboratories (Figure 1b-d). [5][6][7] In some cases, these materials have already found widespread commercial implementation in end use and are comparatively mature. The materials and fundamentals of their responses are summarized in Figure 2. Shape memory alloys (SMAs) and ceramic piezoelectric materials are distinctive in that they are hard, stimuli-responsive materials. Deformation of these materials can produce large energy densities due to their inherent stiffness. Electroactive polymers (EAPs) remain a topic of considerable interest, particularly dielectric elastomer actuators (DEAs). Engineered systems are rapidly emerging and enabling performance gains in robotics, largely based on pneumatic or fluidic (such as HASEL [8] actuators) transport processes that localize deformation to generate force or produce motion. Soft materials, such as shape memory polymers (SMPs), hydrogels, and liquid crystalline polymer networks (LCNs) and elastomers (LCEs) may offer distinctive functional performance to robotic systems in allowing local control of deformation without the need for complex interfacing with mechanisms. As will be evident, each of these materials has inherent advantages and performance tradeoffs that must be considered in functional implementations. However, responsive material systems have a common obstacle to widespread use: the performance and Machines are systems that harness input power to extend or advance function. Fundamentally, machines are based on the integration of materials with mechanisms to accomplish tasks-such as generating motion or lifting an object. An emerging research paradigm is the design, synthesis, and integration of responsive materials within or as machines. Herein, a particular focus is the integration of responsive materials to enable robotic (machine) functions such as gripping, lifting, or motility (walk...

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“…The matrix was adapted to stick on the skin of a patient and transmitted signals between the skin and an electrode conductor supported by the base of the tray [ 22 ]. Philipp reported a pre-stretched hydrophobic elastomer that was sandwiched between two hydrogels, which functioned as ionic conductors to fabricate active noise cancelation [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Silica Nanoparticles Reinforced Ionogel as Nonvolatile and Stretchable Conductors

Zhang

Huang

et al. 2020

Membranes

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Ionogels combine the advantages of being conductive, stretchable, transparent and nonvolatile, which makes them suitable to be applied as conductors for flexible electronic devices. In this paper, a series of ionogels based on 1-ethyl-3-methylimidazolium ethyl-sulfate ([C2mim][EtSO4]) and polyacrylic networks were prepared. Silica nanoparticles (SNPs) were dispersed into the ionogel matrix to enhance its mechanical properties. The thermal, mechanical and electrical properties of the ionogels with various contents of crosslinking agents and SNPs were studied. The results show that a small amount of SNP doping just increases the breaking strain/stress and the nonvolatility of ionogels, as well as maintaining adequate conductivity and a high degree of transparency. Furthermore, the experimental results demonstrate that SNP-reinforced ionogels can be applied as conductors for dielectric elastomer actuators and stretchable wires, as well as for signal transmission.

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A Transparent Membrane for Active Noise Cancelation

Cited by 25 publications

References 29 publications

Power optimization of a conical dielectric elastomer actuator for resonant robotic systems

Power optimization of a conical dielectric elastomer actuator for resonant robotic systems

Materials as Machines

Silica Nanoparticles Reinforced Ionogel as Nonvolatile and Stretchable Conductors

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