Stick or Slip ?: Measuring slip lengths with nm resolution

ORAL

Abstract

Fluid dynamics within small channels draws great interest due to the development of microfluidic devices, yet details about flow immediately at a solid surface remain too vague. Previous attempts to measure surface flow rate were limited to a resolution of the optical wavelength. Here, by using a fluorescence resonance energy transfer (FRET) approach, we improve the resolution by 1-2 orders of magnitude. Two different flow systems, hydrodynamic flow and electrokinetic flow, were investigated with this technique.

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Authors

  • Sung Chul Bae

    Departments of Materials Science and Engineering, of Chemistry, and of Physics, University of Illinois

  • Stephen Anthony

    Department of Chemistry, UIUC

  • Steve Granick

    University of Illinois Urbana-Champaign, Materials Research Laboratory, UIUC, Department of Materials Science \& Engineering, University of Illinois, 1304 W. Green St., Urbana, IL 61801, Univ. of Illinois at Urbana-Champaign, University of Illinois at Urbana-cChampaign, University of IIllinois at Urbana-Champaign, University of Illinois at Urbana-Champaign, University of Illinois