Fig. 2: Gibbs free energy as a function of pressure of an ideal gas confined in a slit pore.
From: Nanoscale thermodynamics needs the concept of a disjoining chemical potential
Repulsive square-well gas-wall potential (\(\varepsilon \, < \,0\)) at a reduced temperature, \(T=0.9525\left|\varepsilon \right|{{k}_{B}}^{-1}\,({{{{{{\rm{e}}}}}}}^{\beta \varepsilon }=0.35)\). The large-pore branch (the left one) and the intermediate-pore branch (the middle one) cross at \({p}_{c1}\), the intermediate-pore branch and the small-pore branch (the right one) cross at \({p}_{c2}\). The black parts represent thermodynamically stable states while the orange parts correspond to metastable states.
