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Imaging microflows and nanopore structures using hydrodynamic force microscopy
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DOI：10.1063/1.3040694.png)
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Abstract
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We report the three-dimensional profilometry of gas microflows and the two-dimensional mapping of fluid permeability through nanoporous substrates using hydrodynamic force microscopy (HFM). Using fluid drag from external flows as a contrast mechanism, HFM has mapped Poiseuille flow through similar to 100 nm pores and has identified subsurface fouling unresolvable by conventional force microscopy. HFM demonstrates nanoscale spatial resolution and flow velocity resolution on the order of 1 cm/s, making it an attractive investigative tool for applications in separation science, microfluidics, and nanoporous materials.
Keywords:
aerodynamics
atomic force microscopy
drag
external flows
flow measurement
flow through porous media
hydrodynamics
microfluidics
nanoporous materials
Poiseuille flow
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