Ingebrigtsen, Trond2; Errington, Jeff3; Truskett, Tom4; Dyre, J. C.1
1 IMFUFA, Department of Science and Environment, Roskilde University2 The Department of Science, Systems and Models, Roskilde University3 State University of New York, Buffalo4 University of Texas at Austin
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 behavior consistent with the existence of isomorphs in the bulk and confined states.