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- W2158587167 abstract "Solid–fluid and solid–solid phase equilibrium for binary mixtures of hard sphere chains modeling n-hexane, n-heptane, and n-octane has been calculated using Monte Carlo computer simulations. Thermodynamic integration was used to calculate the Gibbs free energy and chemical potentials in the solid and fluid phases from pure component reference values. A multiple stage free energy perturbation method was used to calculate the composition derivative of the Gibbs free energy. Equation of state and free energy data for the fluid phase indicate ideal solution behavior. Nonideality is much more significant in the solid phase with only partial solubility of shorter chains in the longer chains and essentially no solubility at the other end of the composition range. The miscibility decreases with increasing chain length difference between the components. For the model of n-hexane/n-octane mixtures solid–solid phase separation has been observed directly in some of the simulations, with the components segregating between the layers of the solid structure. The behavior is similar to that seen in some binary n-alkane mixtures with longer chain lengths but comparable chain length ratios between the components. Such phase separation, although indicated thermodynamically, is not seen directly in the simulations of the n-heptane/n-octane mixture due to the difference in the pure component crystal structures." @default.
- W2158587167 created "2016-06-24" @default.
- W2158587167 creator A5022246881 @default.
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- W2158587167 date "2004-02-08" @default.
- W2158587167 modified "2023-09-26" @default.
- W2158587167 title "Solid–fluid and solid–solid phase equilibrium in a model of n-alkane mixtures" @default.
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- W2158587167 doi "https://doi.org/10.1063/1.1637332" @default.
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