Soft Robotic Grippers

Advanced Materials, Journal Year: 2018, Volume and Issue: 30(29)

Published: May 7, 2018

Abstract Advances in soft robotics, materials science, and stretchable electronics have enabled rapid progress grippers. Here, a critical overview of robotic grippers is presented, covering different material sets, physical principles, device architectures. Soft gripping can be categorized into three technologies, enabling grasping by: a) actuation, b) controlled stiffness, c) adhesion. A comprehensive review each type presented. Compared to rigid grippers, end‐effectors fabricated from flexible components often grasp or manipulate larger variety objects. Such are an example morphological computation, where control complexity greatly reduced by softness mechanical compliance. Advanced components, particular silicone elastomers, shape memory materials, active polymers gels, increasingly investigated for the design lighter, simpler, more universal using inherent functionality materials. Embedding distributed sensors on enhances ways which interact with Challenges include miniaturization, robustness, speed, integration sensing, control. Improved processing methods, sensing play important role future research.

Language: Английский

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Synthesis, properties, and applications of graphene oxide/reduced graphene oxide and their nanocomposites

Nano Materials Science, Journal Year: 2019, Volume and Issue: 1(1), P. 31 - 47

Published: March 1, 2019

Thanks to their remarkable mechanical, electrical, thermal, and barrier properties, graphene-based nanocomposites have been a hot area of research in the past decade. Because simple top-down synthesis, graphene oxide (GO) reduced (rGO) opened new possibilities for gas barrier, membrane separation, stimuli-response characteristics nanocomposites. Herein, we review synthesis techniques most commonly used produce these derivatives, discuss how affects key material highlight some examples with unique impressive properties. We specifically performances separation applications, stimuli-responsive materials, anti-corrosion coatings, energy storage. Finally, outlook remaining challenges field practical industrial-scale production use graphene-derivative-based polymer

Language: Английский

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Advanced Carbon for Flexible and Wearable Electronics

Advanced Materials, Journal Year: 2018, Volume and Issue: 31(9)

Published: Oct. 9, 2018

Abstract Flexible and wearable electronics are attracting wide attention due to their potential applications in human health monitoring care systems. Carbon materials have combined superiorities such as good electrical conductivity, intrinsic structural flexibility, light weight, high chemical thermal stability, ease of functionalization, well mass production, enabling them be promising candidate for flexible electronics. Consequently, great efforts devoted the controlled fabrication carbon with rationally designed structures next‐generation Herein, latest advances rational design toward reviewed. Various (carbon nanotubes, graphene, natural‐biomaterial‐derived carbon, etc.) micro/nanostructures macroscopic morphologies high‐performance introduced. The strategies, working mechanism, performance, carbon‐based devices reviewed discussed, including strain/pressure sensors, temperature/humidity electrochemical conductive electrodes/wires, power devices. Furthermore, integration multiple multifunctional systems is briefly Finally, existing challenges future opportunities this field summarized.

Language: Английский

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Bio-Integrated Wearable Systems: A Comprehensive Review

Chemical Reviews, Journal Year: 2019, Volume and Issue: 119(8), P. 5461 - 5533

Published: Jan. 28, 2019

Bio-integrated wearable systems can measure a broad range of biophysical, biochemical, and environmental signals to provide critical insights into overall health status quantify human performance. Recent advances in material science, chemical analysis techniques, device designs, assembly methods form the foundations for uniquely differentiated type technology, characterized by noninvasive, intimate integration with soft, curved, time-dynamic surfaces body. This review summarizes latest this emerging field "bio-integrated" technologies comprehensive manner that connects fundamental developments chemistry, engineering sensing have potential widespread deployment societal benefit care. An introduction chemistries materials active components these contextualizes essential design considerations sensors associated platforms appear following sections. The subsequent content highlights most advanced biosensors, classified according their ability capture information. Additional sections feature schemes electrically powering strategies achieving fully integrated, wireless systems. concludes an overview key remaining challenges summary opportunities where chemistry will be critically important continued progress.

Language: Английский

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Mechanical Metamaterials and Their Engineering Applications

Advanced Engineering Materials, Journal Year: 2019, Volume and Issue: 21(3)

Published: Jan. 4, 2019

In the past decade, mechanical metamaterials have garnered increasing attention owing to its novel design principles which combine concept of hierarchical architecture with material size effects at micro/nanoscale. This strategy is demonstrated exhibit superior performance that allows us colonize unexplored regions in property space, including ultrahigh strength‐to‐density ratios, extraordinary resilience, and energy absorption capabilities brittle constituents. recent years, unprecedented behaviors such as negative Poisson's ratio, twisting under uniaxial forces, thermal expansion are also realized. paves a new pathway for wide variety multifunctional applications, example, storage, biomedical, acoustics, photonics, management. Herein, fundamental scientific theories behind this class metamaterials, along their fabrication techniques potential engineering applications beyond mechanics reviewed. Explored examples include progresses both functional applications. Finally, current challenges future developments emerging field discussed well.

Language: Английский

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Electrically-Transduced Chemical Sensors Based on Two-Dimensional Nanomaterials

Chemical Reviews, Journal Year: 2019, Volume and Issue: 119(1), P. 478 - 598

Published: Jan. 3, 2019

Electrically–transduced sensors, with their simplicity and compatibility standard electronic technologies, produce signals that can be efficiently acquired, processed, stored, analyzed. Two dimensional (2D) nanomaterials, including graphene, phosphorene (BP), transition metal dichalcogenides (TMDCs), others, have proven to attractive for the fabrication of high–performance electrically-transduced chemical sensors due remarkable physical properties originating from 2D structure. This review highlights advances in sensing rely on materials. The structural components such are described, underlying operating principles different types architectures discussed. features, properties, surface chemistry nanostructures dictate performance reviewed. Key application materials, both a historical analytical perspective, summarized four groups analytes: gases, volatile compounds, ions, biomolecules. is discussed context molecular design, structure–property relationships, device technology. outlook challenges opportunities nanomaterials future development also presented.

Language: Английский

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Graphene and its sensor-based applications: A review

Sensors and Actuators A Physical, Journal Year: 2017, Volume and Issue: 270, P. 177 - 194

Published: Dec. 29, 2017

Language: Английский

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Graphene Electronic Tattoo Sensors

ACS Nano, Journal Year: 2017, Volume and Issue: 11(8), P. 7634 - 7641

Published: July 18, 2017

Tattoo-like epidermal sensors are an emerging class of truly wearable electronics, owing to their thinness and softness. While most them based on thin metal films, a silicon membrane, or nanoparticle-based printable inks, we report sub-micrometer thick, multimodal electronic tattoo that made graphene. The graphene (GET) is designed as filamentary serpentines fabricated by cost- time-effective “wet transfer, dry patterning” method. It has total thickness 463 ± 30 nm, optical transparency ∼85%, stretchability more than 40%. GET can be directly laminated human skin just like temporary fully conform the microscopic morphology surface via van der Waals forces. open-mesh structure makes it breathable its stiffness negligible. A bare able stay attached for several hours without fracture delamination. With liquid bandage coverage, may functional up days. As electrode, GET–skin interface impedance par with medically used silver/silver-chloride (Ag/AgCl) gel electrodes, while offering superior comfort, mobility, reliability. been successfully applied measure electrocardiogram (ECG), electromyogram (EMG), electroencephalogram (EEG), temperature, hydration.

Language: Английский

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Materials and Structures toward Soft Electronics

Advanced Materials, Journal Year: 2018, Volume and Issue: 30(50)

Published: Aug. 2, 2018

Soft electronics are intensively studied as the integration of with dynamic nonplanar surfaces has become necessary. Here, a discussion strategies in materials innovation and structural design to build soft electronic devices systems is provided. For each strategy, presentation focuses on fundamental science mechanics, example device applications highlighted where possible. Finally, perspectives key challenges future directions this field presented.

Language: Английский

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Flexible Piezoelectric-Induced Pressure Sensors for Static Measurements Based on Nanowires/Graphene Heterostructures

ACS Nano, Journal Year: 2017, Volume and Issue: 11(5), P. 4507 - 4513

Published: April 5, 2017

The piezoelectric effect is widely applied in pressure sensors for the detection of dynamic signals. However, these piezoelectric-induced have challenges measuring static signals that are based on transient flow electrons an external load as driven by piezopotential arisen from stress. Here, we present a sensor with nanowires/graphene heterostructures measurements synergistic mechanisms between strain-induced polarization charges nanowires and caused change carrier scattering graphene. Compared to conventional nanowire or graphene sensors, this capable pressures sensitivity up 9.4 × 10-3 kPa-1 fast response time down 5-7 ms. This demonstration shows great potential applications electronic skin wearable devices.

Language: Английский

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