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Probing the nanohydrodynamics at liquid-solid interfaces using thermal motion | | L. Joly
; C. Ybert
; L. Bocquet
; | | Date: |
2 Jul 2005 | | Subject: | Soft Condensed Matter; Statistical Mechanics | cond-mat.soft cond-mat.stat-mech | | Abstract: | 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. | | Source: | arXiv, cond-mat/0507054 | | Other source: | [GID 408791] pmid16486850 | | Services: | Forum | Review | PDF | Favorites | |
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