Abstract
In this paper, thermodynamic miscibility in nanoconfined spaces is quantified and evaluated. First, an analytical generalized equation of state (EOS) is developed by considering the effects of pore radius, molecule–molecule interaction, and molecule–wall interaction at nanometer scale, on the basis of which four extended cubic EOS are proposed. Second, the analytical formulations of the confined fluid free energy of mixing and solubility parameter at nanometer scale are developed thermodynamically. Third, the free energy of mixing and solubility parameter are calculated under different conditions, by means of which the conditions and characteristics of the fluid miscibility at nanometer scale are specifically studied. Finally, two important factors, the temperature and molecule–wall (m–w) interaction, are specifically studied to evaluate and compare their effects on miscibility. The fluid miscibility benefits from the reduction of the pore radius, while the m–w interaction is detrimental to the developmen...
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