Liquid-liquid coexistence in the phase diagram of a fluid confined in fractal porous materials

Details Liquid-liquid coexistence in the phase diagram of a fluid confined in fractal porous materials Liquid-liquid coexistence in the phase diagram of a fluid confined in fractal porous materials

2006-09-12

arxiv.org/abs/cond-mat/0609272v1

Europhys. Lett. 75, 901 (2006)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 4 figures. To be published in Europhys. Letters

Scientific paper

Multicanonical ensemble sampling simulations have been performed to calculate the phase diagram of a Lennard-Jones fluid embedded in a fractal random matrix generated through diffusion limited cluster aggregation. The study of the system at increasing size and constant porosity shows that the results are independent from the matrix realization but not from the size effects. A gas-liquid transition shifted with respect to bulk is found. On growing the size of the system on the high density side of the gas-liquid coexistence curve it appears a second coexistence region between two liquid phases. These two phases are characterized by a different behaviour of the local density inside the interconnected porous structure at the same temperature and chemical potential.

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