Regular Article

The European Physical Journal E

, 35:62

First online:

Near-field laser Doppler velocimetry measures near-wall velocities

  • B. LoppinetAffiliated withFoundation for Research and Technology Hellas, IESL Email author 
  • , J. K. G. DhontAffiliated withForschungszentrum Jülich, ICS-3
  • , P. LangAffiliated withForschungszentrum Jülich, ICS-3

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A new near-wall velocimetry technique is proposed, based on evanescent wave dynamic light scattering, which allows for the measurement of near-wall velocity profile (characterized by an apparent slip velocity and a shear rate) with a resolution of tens of nanometers. A full theoretical expression of the correlation function is derived for the case of linear flow with negligible Brownian motion. The technique is demonstrated for latex spheres dispersed in water-glycerol mixtures.


Soft Matter: Interfacial Phenomena and Nanostructured Surfaces