Electrically powered repeatable air explosions using microtubular graphene assemblies
| Autor: | Jannik Rank, Adrián Romaní Vázquez, Diego Misseroni, Sören Kaps, Rainer Adelung, Yogendra Kumar Mishra, Fabian Schütt, Florian Rasch, Nipon Deka, Nicola M. Pugno, Armin Reimers, Lena M. Saure, Ali Shaygan Nia, Jürgen Carstensen, Martin R. Lohe, Xinliang Feng |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Pneumatic actuator business.industry Graphene Mechanical Engineering Electric potential energy Microfluidics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Combustion 01 natural sciences 7. Clean energy 0104 chemical sciences law.invention Transducer Mechanics of Materials law Optoelectronics General Materials Science Electric power 0210 nano-technology business Actuator |
| Zdroj: | Materials Today Mishra, Y K, Schütt, F, Rasch, F, Deka, N, Reimers, A, Saure, L M, Rank, J, Carstensen, J, Misseroni, D, Vázquez, A R, Lohe, M R, Nia, A S, Pugno, N, Feng, X & Adelung, R 2021, ' Electrically powered repeatable air explosions using microtubular graphene assemblies ', Materials Today, vol. 48, pp. 7-17 . https://doi.org/10.1016/j.mattod.2021.03.010 |
| ISSN: | 1369-7021 |
| Popis: | Controllable rapid expansion and activation of gases is important for a variety of applications, including combustion engines, thrusters, actuators, catalysis, and sensors. Typically, the activation of macroscopic gas volumes is based on ultra-fast chemical reactions, which require fuel and are irreversible. An “electrically powered explosion”, i.e., the rapid increase in temperature of a macroscopic relevant gas volume induced by an electrical power pulse, is a feasible repeatable and clean alternative, providing adaptable non-chemical power on demand. Till now, the fundamental problem was to find an efficient transducer material that converts electrical energy into an immediate temperature increase of a sufficient gas volume. To overcome these limitations, we developed electrically powered repeatable air explosions (EPRAE) based on free-standing graphene layers of nanoscale thickness in the form of microtubes that are interconnected to a macroscopic framework. These low-density and highly permeable graphene foams are characterized by heat capacities comparable to air. The EPRAE process facilitates cyclic heating of cm3-sized air volumes to several 100 °C for more than 100,000 cycles, heating rates beyond 300,000 K s−1 and repetition rates of several Hz. It enables pneumatic actuators with the highest observed output power densities (>40 kW kg−1) and strains ∼100%, as well as tunable microfluidic pumps, gas flowmeters, thermophones, and micro-thrusters. |
| Databáze: | OpenAIRE |
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