Shear-dependent apparent slip on hydrophobic surfaces: The Mattress Model

Details Shear-dependent apparent slip on hydrophobic surfaces: The Mattress Model Shear-dependent apparent slip on hydrophobic surfaces: The Mattress Model

2003-02-13

arxiv.org/abs/cond-mat/0302276v4

Phys. Rev E. (2004) 70, 026311

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevE.70.026311

Recent experiments (Zhu & Granick (2001) Phys. Rev. Lett. 87 096105) have measured a large shear dependent fluid slip at partially wetting fluid-solid surfaces. We present a simple model for such slip, motivated by the recent observations of nanobubbles on hydrophobic surfaces. The model considers the dynamic response of bubbles to change in hydrodynamic pressure due to the oscillation of a solid surface. Both the compression and diffusion of gas in the bubbles decrease the force on the oscillating surface by a ``leaking mattress'' effect, thereby creating an apparent shear-dependent slip. With bubbles similar to those observed by atomic force microscopy to date, the model is found to lead to force decreases consistent with the experimental measurements of Zhu & Granick.

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