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 s1 and repetition rates of several Hz. It enables pneumatic actuators with the highest observed output power densities (>40 kW kg1 ) and strains 100%, as well as tunable microfluidic pumps, gas flowmeters, thermophones, and microthrusters.

Electrically powered repeatable air explosions using microtubular graphene assemblies / Schütt, Fabian; Rasch, Florian; Deka, Nipon; Reimers, Armin; Saure, Lena M.; Kaps, Sören; Rank, Jannik; Carstensen, Jürgen; Kumar Mishra, Yogendra; Misseroni, Diego; Romani Vázquez, Adrian; Lohe, Martin R.; Shaygan Nia, Ali; Pugno, Nicola M.; Feng, Xinliang; Adelung, Rainer. - In: MATERIALS TODAY. - ISSN 1369-7021. - 48:(2021), pp. 7-17. [10.1016/j.mattod.2021.03.010]

Electrically powered repeatable air explosions using microtubular graphene assemblies

Misseroni, Diego;Pugno, Nicola M.;
2021-01-01

Abstract

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 s1 and repetition rates of several Hz. It enables pneumatic actuators with the highest observed output power densities (>40 kW kg1 ) and strains 100%, as well as tunable microfluidic pumps, gas flowmeters, thermophones, and microthrusters.
2021
Schütt, Fabian; Rasch, Florian; Deka, Nipon; Reimers, Armin; Saure, Lena M.; Kaps, Sören; Rank, Jannik; Carstensen, Jürgen; Kumar Mishra, Yogendra; Misseroni, Diego; Romani Vázquez, Adrian; Lohe, Martin R.; Shaygan Nia, Ali; Pugno, Nicola M.; Feng, Xinliang; Adelung, Rainer
Electrically powered repeatable air explosions using microtubular graphene assemblies / Schütt, Fabian; Rasch, Florian; Deka, Nipon; Reimers, Armin; Saure, Lena M.; Kaps, Sören; Rank, Jannik; Carstensen, Jürgen; Kumar Mishra, Yogendra; Misseroni, Diego; Romani Vázquez, Adrian; Lohe, Martin R.; Shaygan Nia, Ali; Pugno, Nicola M.; Feng, Xinliang; Adelung, Rainer. - In: MATERIALS TODAY. - ISSN 1369-7021. - 48:(2021), pp. 7-17. [10.1016/j.mattod.2021.03.010]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/321659
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