A Landau-Squire nanojet.
A Landau-Squire nanojet.
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DOI:
10.1021/nl402350a
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发表时间:
2013-11-13
期刊:
影响因子:
10.8
通讯作者:
Keyser UF
中科院分区:
文献类型:
--
作者:
Laohakunakorn N;Gollnick B;Moreno-Herrero F;Aarts DG;Dullens RP;Ghosal S;Keyser UF
Fluid jets are found in nature at all length scales – 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 ~ 30 pL/s. A novel anemometry technique allows us to map out the vorticity and velocity fields which 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 micro manipulation, nano patterning, and as a diode in microfluidic circuits.
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