Viscoelasticity Enhances Nanometer-Scale Slip in Gigahertz-Frequency Liquid Flows

The interaction between flowing liquids and solid surfaces underpins many physical phenomena technologies, such as the ability of an airfoil to generate lift mixing for industrial applications. These are often described using Navier-Stokes equations no-slip boundary condition: assumption that liquid immediately adjacent a surface does not move relative surface. Herein, we observe violation condition with strong enhancement slip due intrinsic viscoelasticity bulk liquid. This is achieved by measuring 20 GHz acoustic vibrations gold nanoparticles in glycerol/water mixtures, which underlying physics explored rigorous, theoretical models. reported revises current understanding ultrafast flows, implications technologies ranging from membrane filtration nanofluidic devices biomolecular sensing.