Thermodynamic behaviour of supercritical matter.
@article{Bolmatov2013ThermodynamicBO, title={Thermodynamic behaviour of supercritical matter.}, author={Dima Bolmatov and Vadim V. Brazhkin and Kostya Trachenko}, journal={Nature communications}, year={2013}, volume={4}, pages={ 2331 } }
Since their discovery in 1822, supercritical fluids have been of enduring interest and have started to be deployed in many important applications. Theoretical understanding of the supercritical state is lacking and is seen to limit further industrial deployment. Here we study thermodynamic properties of the supercritical state and discover that specific heat shows a crossover between two different regimes, an unexpected result in view of currently perceived homogeneity of supercritical state in…
88 Citations
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The heterogeneity across the Frenkel line, found to be present both in bulk and confined systems, might cause the breakdown of the universal scaling between structure and dynamics of fluids necessitating the determination of a unique relationship between them.
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Structural properties of the supercritical carbon dioxide are studied and the existence of persistent medium-range order correlations are discovered, which make super critical carbon dioxide nonuniform and heterogeneous on an intermediate length scale are discovered.
Evidence for structural crossover in the supercritical state.
- PhysicsThe Journal of chemical physics
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It is demonstrated that there is a well-defined structural crossover between the supercritical structure, dynamics, and thermodynamics, and that this crossover demarcates liquid-like and gas-like configurations and the presence of medium-range structural correlations.
Crossover of collective modes and positive sound dispersion in supercritical state.
- PhysicsJournal of physics. Condensed matter : an Institute of Physics journal
- 2016
It is found that the supercritical system sustains propagating solid-like transverse modes below the Frenkel line but not above where there is one longitudinal mode only.
The nature of collective excitations and their crossover at extreme supercritical conditions
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- 2019
Direct evidence is presented for propagating solid-like longitudinal phonon-like excitations with wavelengths extending to interatomic separations deep in the supercritical state at temperatures up to 3,300 times the critical temperature.
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