Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.31: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P3
Flow rectification in glass nanopores — Nadanai Laohakunakorn1, Sandip Ghosal2, and •Ulrich F Keyser1 — 1Cavendish Laboratory, University of Cambridge, JJ Thomson Ave, CB3 0HE Cambridge, UK — 2Northwestern University, Evanston, IL60208-3109, USA
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 around 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 [1]. 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.
[1] N. Laohakunakorn, B. Gollnick, F. Moreno-Herrero, D.G.A.L. Aarts, R.P.A. Dullens, S. Ghosal, and U. F. Keyser. A Landau-Squire Nanojet. Nano Letters 13(11): 5141-6 (2013)