A Landau-Squire nanojet

Nadanai Laohakunakorn, Benjamin Gollnick, Fernando Moreno-Herrero, Dirk G.A.L. Aarts, Roel P.A. Dullens, Sandip Ghosal, Ulrich F. Keyser

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)5141-5146
Number of pages6
JournalNano Letters
Volume13
Issue number11
DOIs
Publication statusPublished - 13 Nov 2013

Keywords

  • flow rectification
  • microfluidics
  • Nanojet
  • nanopore

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