1,720,990 research outputs found
Developing Metal–Organic Frameworks for Dual Electrical and Magnetic Response in Soft Actuators
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Mutually Exclusive MXene and Graphene Oxide Multilayer Composites in Lithium-Sulfur Battery
No full textElectroactive artificial muscles: a constructive approach towards real-field soft robotics
No full textElectroactive artificial muscles has drawn special attention for potential engineering applications, such as biomedical active devices, haptic-feedback systems, wearable soft electronics, and soft micro-robotics. However in the field of bioinspired soft robotics, to accomplish sophisticated tasks as human fingers, electroactive artificial muscles are under development. Because, most of the exiting soft actuators show lack of high bending displacements with irregular response characteristics under low input voltages due to instabilities of active electrode materials under operation. This situation necessitates for the development of totally brand new functional electrode materials with enormous stability under prolonged electro-chemical exposures. The developed electrode materials based on pre-designed functional covalent organic frameworks and poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) show promising actuation characteristics under low electric stimuli towards real-field soft robotics. The proposed artificial muscles can readily be operated on fragile display to make a soft touch similar to real human finger and can successfully accomplishes precise sophisticated tasks such as controlling personal folders and swiping pages of online books, and playing music apps
An advanced measurement technique for tracing ions’ movement through electroactive polymers
No full textIn spite of the simple fabrication process, Ionic electroactive polymers (iEAP) work based on a very complex actuation mechanism that is originated in the movement of unequally sized ions through the ionic channels inside the polymer membrane. Such a sophisticated mechanism leads to nonlinear behavior of iEAPs while subjected to electric stimulation and makes their response unpredictable. Here we propose a real-time measurement technique for tracing the movement of ions inside the polymer membrane to better estimate the behavior of the iEAPs during actuation. To do so, a highly flexible and porous electrode is needed to be incorporated into the polymer membrane thus it neither blocks the ions’ path nor restricts the mechanical deformation. Using such an electrode one can measure the internal electrical potential of the membrane, during actuation, to monitor the potential alteration caused by the ions’ migration inside the membrane
A dual-ion accepting vanadium carbide nanowire cathode integrated with carbon cloths for high cycling stability
No full textHerein, we report vanadium carbide (V8C7) nanowires (NWs) axially grown on carbon cloths (CCs) as a dual-ion accepting cathode for both lithium (LIBs) and sodium-ion batteries (SIBs). Using a facile hydrothermal method, we grew V2O3 NWs on CCs and subsequently reduced them to V8C7 by annealing with carbon sources under a H-2/Ar atmosphere. In striking contrast to V2O5 NW cathodes obtained by annealing under air, the V8C7 NWs exhibit outstanding cycling stability during 500 cycles, and good rate capability for both LIBs and SIBs. V8C7 NWs as cathode active materials for LIBs exhibited 203.9 mA h g(-1) specific capacity at 0.1 C after 500 cycles, 91.12% cycling retention and a coulombic efficiency of 99.84%. As cathodes in SIBs, the V8C7 NWs delivered 176.34 mA h g(-1) specific capacity at 0.1 C during 300 cycles. Their defect sites by removal of the oxygen framework in V2O3 NWs have a high surface area (183.27 m(2) g(-1)) and the unique 1D NW structure highly mitigates the volume changes during charge and discharge showing a superior electrochemical performance. Compared to commercially available cathodes, V8C7 nanowires have very good cycling stability and enhanced electrical conductivity. Moreover, the synergistic effect with 3D CCs utilized here as a current collector provides a large number of cation-accessible active sites in conjunction with high electrical conductivity and chemical stability.
Exploring role of microbatteries in enhancing sustainability and functionality of implantable biosensors and bioelectronics
No full textMicrobatteries are emerging as a sustainable, miniaturized power source, crucial for implantable biomedical devices. Their significance lies in offering high energy density, longevity, and rechargeability, facilitating uninterrupted health monitoring and treatment within the body. The review delves into the development of microbatteries, emphasizing their miniaturization and biocompatibility, crucial for long-term, safe in -vivo use. It examines cutting -edge manufacturing techniques like physical and chemical vapor deposition, and atomic layer deposition, essential for the precision manufacture of the microbatteries. The paper contrasts primary and secondary batteries, highlighting the advantages of zinc -ion and magnesium -ion batteries for enhanced stability and reduced reactivity. It also explores biodegradable batteries, potentially obviating the need for surgical extraction post -use. The integration of microbatteries into diagnostic and therapeutic devices is also discussed, illustrating how they enhance the efficacy and sustainability of implantable biosensors and bioelectronics.
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