Abstract
We investigate the demixing and the surface-induced population inversion of a binary Gaussian mixture, which exhibits the fluid-fluid demixing transition of the bulk system, in a nanopore. The result shows that the population inversion is the typical shift of the first-order fluid-fluid demixing transition due to the confinement effect. The population inversion line is affected by the crossinteraction between unlike species σ 12, the mole fraction of species x 2, and the slit width H. At a low cross-interaction between unlike species, the population inversion line for x 2 < x c is shifted toward a lower density with decreasing the slit width, where x c is the critical consolute point at the bulk phase, while the population inversion is not observed for x 2 > x c . At a high cross-interaction, for x 2 < x c , the population inversion line is shifted toward a higher density with decreasing slit width. In this case, the population inversion line is found at a higher density compared with the bulk mixing transition line because species 1 in a nanopore is favored. However, for x 2 > x c , it is shifted toward a lower density.
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Kim, EY., Kim, SC. Demixing and surface-induced population inversion of a binary Gaussian mixture in nanopores. Journal of the Korean Physical Society 63, 1968–1974 (2013). https://doi.org/10.3938/jkps.63.1968
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DOI: https://doi.org/10.3938/jkps.63.1968