Probing the nanohydrodynamics at liquid-solid interfaces using thermal motion

Details Probing the nanohydrodynamics at liquid-solid interfaces using thermal motion Probing the nanohydrodynamics at liquid-solid interfaces using thermal motion

2005-07-02

arxiv.org/abs/cond-mat/0507054v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

We report on a new method to characterize nano-hydrodynamic properties at the liquid/solid interface relying solely on the measurement of the thermal motion of confined colloids. Using Fluorescence Correlation Spectroscopy (FCS) to probe the diffusion of the colloidal tracers, this optical technique --equivalent in spirit to the microrheology technique used for bulk properties-- is able to achieve nanometric resolution on the slip length measurement. It confirms the no-slip boundary condition on wetting surfaces and shows a partial slip b=18 +/- 5 nm on non-wetting ones. Moreover, in the absence of external forcing, we do not find any evidence for large nano-bubble promoted slippage on moderately rough non-wetting surfaces.

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