Electrically powered repeatable air explosions using microtubular graphene assemblies

Yogendra Kumar Mishra, Fabian Schütt*, Florian Rasch, Nipon Deka, Armin Reimers, Lena M. Saure, Jannik Rank, Jürgen Carstensen, Diego Misseroni, Adrian Romani Vázquez, Martin R. Lohe, Ali Shaygan Nia, Nicola Pugno, Xinliang Feng, Rainer Adelung


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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.
TidsskriftMaterials Today
Sider (fra-til)7-17
StatusUdgivet - sep. 2021


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