Paving the way to tailor-made carbon nanomaterials and more accurate energetic materials modeling Livermore_Lab NatureComms
Oxygen-decorated liquid nanocarbon clusters predicted to form from shock compressed cryogenic liquid carbon monoxide. The snapshot, which is from machine-learning-driven atomistic simulations, shows only carbon and oxygen atoms participating in cluster formation and not the surrounding reactive fluid. Credit: Rebecca Lindsey/LLNL
Laser-driven shock and detonation experiments can be used to drive carbon-rich materials to conditions of temperatures of the thousands of degrees Kelvin and pressures of tens of GPa , under which complex processes lead to the formation of 2-10 nanometer nanocarbons within hundreds of nanoseconds.
The LLNL team found that liquid nanocarbon formation follows classical growth kinetics driven by Ostwald ripening and obeys dynamical scaling in a process mediated by reactive carbon transport in the surrounding fluid. Carbon condensation in organic systems subject to high temperatures and pressures is a non-equilibrium process akin to phase separation in mixtures quenched from a homogenous phase into a two-phase region, yet this connection has only been partially explored; notably, phase separation concepts remain very relevant for nanoparticle synthesis.
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