Dynamics of simple liquids at heterogeneous surfaces : Molecular Dynamics simulations and hydrodynamic description

Details Dynamics of simple liquids at heterogeneous surfaces : Molecular Dynamics simulations and hydrodynamic description Dynamics of simple liquids at heterogeneous surfaces : Molecular Dynamics simulations and hydrodynamic description

2004-04-03

arxiv.org/abs/cond-mat/0404077v1

Physics

Condensed Matter

Soft Condensed Matter

submitted to EPJE

Scientific paper

10.1140/epje/i2004-10061-9

In this paper we consider the effect of surface heterogeneity on the slippage of fluid, using two complementary approaches. First, MD simulations of a corrugated hydrophobic surface have been performed. A dewetting transition, leading to a super-hydrophobic state, is observed for pressure below a ``capillary'' pressure. Conversely a very large slippage of the fluid on this composite interface is found in this superhydrophobic state. Second, we propose a macroscopic estimate of the effective slip length on the basis of continuum hydrodynamics, in order to rationalize the previous MD results. This calculation allows to estimate the effect of a heterogeneous slip length pattern on the composite interface. Comparison between the two approaches are in good agreement at low pressure, but highlights the role of the exact shape of the liquid-vapor interface at higher pressure. These results confirm that small variations in the roughness of a surface can lead to huge differences in the slip effect. On the basis of these results, we propose some guidelines to design highly slippery surfaces, motivated by potential applications in microfluidics.

Affiliated with

Also associated with

No associations

Rating

Dynamics of simple liquids at heterogeneous surfaces : Molecular Dynamics simulations and hydrodynamic description does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dynamics of simple liquids at heterogeneous surfaces : Molecular Dynamics simulations and hydrodynamic description, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamics of simple liquids at heterogeneous surfaces : Molecular Dynamics simulations and hydrodynamic description will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-287214