Capillary levelling of free-standing liquid nanofilms
  We report on the capillary-driven levelling of a topographical perturbation at the surface of a free-standing liquid nanofilm. The width of a stepped surface profile is found to evolve as the square root of time. The hydrodynamic model is in excellent agreement with the experimental data. In addition to exhibiting an analogy with diffusive processes, this novel system serves as a precise nanoprobe for the rheology of liquids at interfaces in a configuration that avoids substrate effects. 
Mark Ilton, Miles M. P. Couchman, Cedric Gerbelot, Michael Benzaquen,   Paul D. Fowler, Howard A. Stone, Elie Rapha\"el, Kar...
cond-mat.soft cond-mat.mes-hall cond-mat.mtrl-sci physics.chem-ph physics.flu-dyn