Electrically powered repeatable air explosions using microtubular graphene assemblies

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

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Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstrakt

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.
OriginalsprogEngelsk
TidsskriftMaterials Today
ISSN1369-7021
DOI
StatusE-pub ahead of print - 2021

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