Probing the nanohydrodynamics at liquid-solid interfaces using thermal motion

被引:140
作者
Joly, L [1 ]
Ybert, C
Bocquet, L
机构
[1] Univ Lyon 1, UMR 5586, Lab Phys Mat Condensee & Nanostruct, F-69622 Villeurbanne, France
[2] CNRS, F-69622 Villeurbanne, France
关键词
D O I
10.1103/PhysRevLett.96.046101
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report on a new method to characterize nanohydrodynamic properties at the liquid-solid interface relying solely on the measurement of the thermal motion of confined colloids. This equilibrium measurement of surface properties-equivalent in spirit to the passive microrheology technique used for bulk properties-is able to achieve nanometric resolution on the slip length measurement. Exploring the "zero shear rate" limit, it rules out shear rate threshold to slip effects and extends the range over which slip lengths are shown to be flow independent. Avoiding the nucleation of gas pockets (nanobubbles) through external forcing, it validates the theoretical picture for intrinsic liquid-solid interfaces, reporting nanometric slip lengths (b = 18 +/- 5 nm) only in nonwetting situations, opening the route to quantitative study on more complex surfaces with combined effects of nonwettability and roughness.
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页数:4
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