  Many experiments have shown large flow enhancement ratios (up to $10^5$) in
carbon nanotubes (CNT) with diameter$> 5$nm. However, molecular dynamics
simulations have never replicated these results maintaining a
three-order-of-magnitude gap with measurements. Our study provides a generic
model of slip flow in nanofluidics that fills this significant gap and sheds
light on its origin. Compared to 140 literature cases, the model explains the
entire range of experimental flow enhancements by finite variations of
interfacial energies. The model provides insight into puzzling observations
such as differences of CNTs and boron nitride nanotubes, the slip on
low-contact-angle surfaces and massive functionalization effects. This study
could advance our understanding of nano-scale transport mechanisms and aid the
design of tailored nanomembranes.
