- 标题
- 摘要
- 关键词
- 实验方案
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Laser Programmable Patterning of RGO/GO Janus Paper for Multiresponsive Actuators
摘要： Graphene oxide (GO) with tunable physical/chemical properties is a versatile material for smart bimorph actuators. Using GO or its derivatives (e.g., reduced GO, RGO) as an active material, actuators can be manipulated under various external stimuli including moisture, light, temperature, and electricity. However, most of these GO-based actuators respond to a solo stimulus, which limits its cutting-edge applications in soft robotics. Here, the programmable patterning of RGO/GO Janus paper using a threshold-controlled direct laser writing (DLW) technology is reported. By combining the RGO/GO Janus paper with a common thermally expansive polymer layer, a moisture, light, and electricity multiresponsive actuator is fabricated, in which the RGO interlayer plays multiroles including moisture-passive layer, photothermal/electrothermal layer, thermal conductive layer, and inert layer for thermal expansion. As a proof of concept, multiresponsive actuators including a bidirectional cantilever and a smart curtain are fabricated, demonstrating the great potential for developing soft robots.
关键词： soft robots,laser reduction,multiresponsive actuators,reduced graphene oxide
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Extracting Cell Level Characteristics from Photovoltaic Module Electroluminescence Images
摘要： This letter introduces Minitaur, a dynamically running and leaping quadruped, which represents a novel class of direct-drive (DD) legged robots. We present a methodology that achieves the well-known benefits of DD robot design (transparency, mechanical robustness/ef?ciency, high-actuation bandwidth, and increased speci?c power), affording highly energetic behaviors across our family of machines despite severe limitations in speci?c force. We quantify DD drivetrain bene?ts using a variety of metrics, compare our machines’ performance to previously reported legged platforms, and speculate on the potential broad-reaching value of “transparency” for legged locomotion.
关键词： Mechanism Design of Mobile Robots,Multilegged Robots,Novel Actuators for Natural Machine Motion
更新于2025-09-19 17:13:59
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[IEEE 2019 3rd International Conference on Recent Developments in Control, Automation & Power Engineering (RDCAPE) - NOIDA, India (2019.10.10-2019.10.11)] 2019 3rd International Conference on Recent Developments in Control, Automation & Power Engineering (RDCAPE) - Smart LED Streetlighting System with Improved Power Quality and Low Standby Consumption
摘要： This letter introduces Minitaur, a dynamically running and leaping quadruped, which represents a novel class of direct-drive (DD) legged robots. We present a methodology that achieves the well-known benefits of DD robot design (transparency, mechanical robustness/ef?ciency, high-actuation bandwidth, and increased speci?c power), affording highly energetic behaviors across our family of machines despite severe limitations in speci?c force. We quantify DD drivetrain bene?ts using a variety of metrics, compare our machines’ performance to previously reported legged platforms, and speculate on the potential broad-reaching value of “transparency” for legged locomotion.
关键词： Multilegged Robots,Novel Actuators for Natural Machine Motion,Mechanism Design of Mobile Robots
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE SENSORS - Montreal, QC, Canada (2019.10.27-2019.10.30)] 2019 IEEE SENSORS - A MEMS Based Lens Microscanner for Resolution Enhancement of Infrared Imaging Systems
摘要： The aim of this study is to demonstrate a Micro Electro Mechanical Systems (MEMS) based in-plane (x and y axes) lens scanner to improve the resolution of Long Wave Infrared Optical Systems (8-12μm wavelength). The proposed actuator consists of a 2 axis decoupled stage and has 4 separate V-Shaped thermal actuators which provide sufficient force and displacement to position the lens within required time. Miniaturization of lens has been achieved by using an aspherical surface and optimization of optical system parameters. Actuators have 40 micrometers displacement capability which is sufficient for sub-pixel image motion on the detector. Frequency of actuation is 25 Hz which corresponds to construction of 1 frame per 40 milliseconds.
关键词： Resolution enhancement,Infrared Optical Systems,Micro-Scanning,Thermal Chevron Actuators
更新于2025-09-16 10:30:52
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Light-fuelled freestyle self-oscillators
摘要： Self-oscillation is a phenomenon where an object sustains periodic motion upon non-periodic stimulus. It occurs commonly in nature, a few examples being heartbeat, sea waves and fluttering of leaves. Stimuli-responsive materials allow creating synthetic self-oscillators fuelled by different forms of energy, e.g. heat, light and chemicals, showing great potential for applications in power generation, autonomous mass transport, and self-propelled micro-robotics. However, most of the self-oscillators are based on bending deformation, thereby limiting their possibilities of being implemented in practical applications. Here, we report light-fuelled self-oscillators based on liquid crystal network actuators that can exhibit three basic oscillation modes: bending, twisting and contraction-expansion. We show that a time delay in material response dictates the self-oscillation dynamics, and realize a freestyle self-oscillator that combines numerous oscillation modes simultaneously by adjusting the excitation beam position. The results provide new insights into understanding of self-oscillation phenomenon and offer new designs for future self-propelling micro-robots.
关键词： Twisting,Bending,Micro-robotics,Contraction-expansion,Liquid crystal network actuators,Light-fuelled,Self-oscillation
更新于2025-09-12 10:27:22
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Transparent Flexible Polymer Actuator with Enhanced Output Force Enabled by Conductive Nanowires Interlayer
摘要： In this work, an approach to enhance the output force of polymer actuators by increasing the dielectric permittivity of the electroactive polymer (EAP), poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)), via incorporation of a nanowire interlayer into the polymer matrix is presented. The interlayer is formed by a network of highly conductive silver nanowires with high aspect ratio. Due to the enhanced dielectric properties, the output force of the resultant composite actuator is double that of a neat EAP actuator. This advantage can be utilized to improve user perception of tactile feedback produced by the modified EAP actuator. The higher output force translates to a lower excitation voltage which is 60% of what is required to excite a neat EAP actuator. The resultant-modified EAP maintains its transparency and flexibility, while enhancing the dielectric properties without severe degradation of the electrical breakdown strength. The excellent transparency and flexibility of the modified EAP allows for a wider range of possible applications such as direct and localized haptic feedback on flexible electronic displays, touch screens, etc.
关键词： silver nanowires,haptic feedback,transparent flexible actuators,electroactive polymers,space charge
更新于2025-09-12 10:27:22
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Entangled Azobenzene‐Containing Polymers with Photoinduced Reversible Solid‐to‐Liquid Transitions for Healable and Reprocessable Photoactuators
摘要： Photoactuators based on liquid crystal elastomers or networks are smart materials that show photoinduced motions. However, their crosslinked networks make their repair or reprocessing difficult. Here, a healable and reprocessable photoactuator is fabricated using entangled high-molecular-weight azobenzene-containing polymers (azopolymers) that are non-crosslinked. A series of linear liquid crystal azopolymers with different molecular weights are synthesized. The low-molecular-weight azopolymers (5–53 kg mol?1) cannot form freestanding photoactuators because their polymer chains lack entanglements, which makes them hard and brittle. In contrast, flexible and stretchable actuators are fabricated using high-molecular-weight azopolymers (80–100 kg mol?1) that exhibit good processability because of the polymer chain entanglements. The azopolymer photoactuators show photoinduced bending based on photoinduced trans–cis isomerization of the azopolymers on the irradiated side. The experiments show not only photoinduced phase transitions or changes in the order parameters but also photoinduced solid-to-liquid transition of the azopolymers resulting in shape changes and mechanical responses. Thus, photoinduced solid-to-liquid transition is a new mechanism for the design of photoactuators. Moreover, the azopolymer photoactuators are healable and reprocessable via solution processing or light irradiation. Healability and reprocessability prolong lifetimes of photoactuators are important for materials reusage and recycling, and represent a new strategy for the preparation of smart materials.
关键词： azobenzene,actuators,photoswitches,polymers,self-healing
更新于2025-09-12 10:27:22
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Self‐Healable Black Phosphorus Photodetectors
摘要： Large‐strain multilayer actuators (MLAs) were fabricated by tape‐casting 0.91(Na1/2Bi1/2)TiO3–0.06BaTiO3–0.03AgNbO3 (NBT‐BT–3AN) lead‐free incipient piezoceramics co‐fired with Pt inner electrodes. Microstructures, dielectric properties, unipolar and bipolar strain, as well as fatigue properties of the MLAs were investigated. It was found that the actuator consisting of 15 ceramic layers with individual thicknesses of 114 μm could output a large unipolar strain of 0.3% and a dynamic displacement of 5 μm at 6 kV/mm at room temperature. It exhibited excellent cycling stability and provided a high strain of 0.23% after 107 cycles at 6 kV/mm. Moreover, these MLAs still can deliver a strain of 0.20% at 125°C.
关键词： lead‐free piezoceramics,multilayer actuators,large strain,cycling stability,temperature stability
更新于2025-09-11 14:15:04
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[IEEE 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Berlin, Germany (2019.6.23-2019.6.27)] 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Out-of-Plane Long-Range Operated Soft Engine with Driving Stretchable Zone Plate and Led Abilities for Tunable Focused Therapeutic Ultrasonic and Infrared Heating Applications
摘要： This paper presents a soft engine which performs the long-range up-and-down motion with four planar film-structured electroactive polymer (EAP) actuators. The engine can dynamically tune the focus of ultrasonic beam by driving the foil-made stretchable Fresnel zone plate with out-of-plane motion. Moreover, the micromachined buckles and serpentine structure were utilized to convert the bending motion of a pair of actuators to the linear motion along with lighting up the light-emitting diode (LED). We successfully demonstrate that the developed device stretches the zone plate to tune the focal point of the ultrasonic beam up to 4 mm. Also, controlling the LED to turn on and off in a moving cycle of the soft engine is displayed.
关键词： stereolithography,Electroactive polymer,actuators,zone plate,ionic polymer metal composite
更新于2025-09-11 14:15:04
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[Energy, Environment, and Sustainability] Sensors for Automotive and Aerospace Applications || Fabrication Processes for Sensors for Automotive Applications: A Review
摘要： MEMS technology has revolutionized the industries of twenty-?rst century by combining the micromachining technology with the silicon microelectronics. The miniaturized devices produced from MEMS-based fabrication process have good adaptability and ?exibility due to its low power consumption and compactness. MEMS devices are hugely deployed for automobiles sectors like accelerometer, gyroscopes, pressure sensors, etc. These devices are fabricated through batch fabrication in industries, using various types of fabrication technologies. In this chapter, ?rst we have given an overview about MEMS. In the second section, we have given details about various kinds of materials which are utilized in the formation of sensors. In the third, fourth, and ?fth sections, in details, different lithographic, bulk, and surface micromachining techniques, and thin ?lm deposition techniques are discussed. At the last section, we have mentioned recent progress in MEMS-based processes, which are presently used mostly in atomic level for the fabrication of sensor and devices for automotive application.
关键词： Sensors,Microfabrication,MEMS,Actuators
更新于2025-09-10 09:29:36