Imaging microflows and nanopore structures using hydrodynamic force microscopy
2008
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 ∼100nm pores and has identified subsurface fouling unresolvable by conventional force microscopy. HFM demonstrates nanoscale spatial resolution and flow velocity resolution on the order of 1cm∕s, making it an attractive investigative tool for applications in separation science, microfluidics, and nanoporous materials.
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