Sublimation phenomena in slit nanopores: Lennard-Jones phase diagram

Sublimation phenomena of Lennard-Jones fluids in slit-shaped nanopores were examined. Vapor-phase pressure at which a solid phase forms in a pore at a constant temperature is determined by the authors' molecular dynamics technique. The obtained phase-boundary pressure is remarkably lower than that of the bulk phase. A simple model of the sublimation is presented, which successfully predicts the molecular dynamics results with no adjustable parameter. Thus, a whole Lennard-Jones phase diagram in slit-shaped nanopores can now be predicted.