title: A Landau-Squire nanojet.
abstract: Fluid jets are found in nature at all length scales from microscopic to cosmological. Here we report on an electroosmotically driven jet from a single glass nanopore about 75 nm in radius with a maximum flow rate ~15 pL/s. A novel anemometry technique allows us to map out the vorticity and velocity fields that show excellent agreement with the classical Landau-Squire solution of the Navier-Stokes equations for a point jet. We observe a phenomenon that we call flow rectification: an asymmetry in the flow rate with respect to voltage reversal. Such a nanojet could potentially find applications in micromanipulation, nanopatterning, and as a diode in microfluidic circuits.
authors.affiliation: Cavendish Laboratory, University of Cambridge , Cambridge CB3 0HE, United Kingdom.
authors.forename: Nadanai
authors.initials: N
authors.lastname: Laohakunakorn
authors.forename: Benjamin
authors.initials: B
authors.lastname: Gollnick
authors.forename: Fernando
authors.initials: F
authors.lastname: Moreno-Herrero
authors.forename: Dirk G A L
authors.initials: DG
authors.lastname: Aarts
authors.forename: Roel P A
authors.initials: RP
authors.lastname: Dullens
authors.forename: Sandip
authors.initials: S
authors.lastname: Ghosal
authors.forename: Ulrich F
authors.initials: UF
authors.lastname: Keyser
mesh_terms: D008962:Models, Theoretical; D036103:Nanotechnology