Predicting how nanoconfinement changes the relaxation time of a supercooled liquid
arXiv:1311.0976 · doi:10.1103/PhysRevLett.111.235901
Abstract
The properties of nanoconfined fluids can be strikingly different from those of bulk liquids. A basic unanswered question is whether the equilibrium and dynamic consequences of confinement are related to each other in a simple way. We study this question by simulation of a liquid comprising asymmetric dumbbell-shaped molecules, which can be deeply supercooled without crystallizing. We find that the dimensionless structural relaxation times - spanning six decades as a function of temperature, density, and degree of confinement - collapse when plotted versus excess entropy. The data also collapse when plotted versus excess isochoric heat capacity, a behaviour that follows from the existence of isomorphs in the bulk and confined states.
8 pages; accepted for publication in Phys. Rev. Lett. Includes the Supplemental Material
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