Friction and Slip at Simple Fluid-Solid Interfaces: The Roles of the Molecular Shape and the Solid-Liquid Interaction

Autor:	Liliane Léger, Tatiana Schmatko, H. Hervet
Rok vydání:	2005
Předmět:	Materials science business.industry General Physics and Astronomy Near and far field Mechanics Slip (materials science) Surface finish Hexadecane Surface tension chemistry.chemical_compound Optics Molecular geometry chemistry Squalane Slip ratio business
Zdroj:	Physical Review Letters. 94
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.94.244501
Popis:	the fluid in the immediate vicinity of the solid wall, and conducted to explore in a systematic way the role of the strength of the fluid-solid interactions on the slip length. Comparing the flow behavior of two different fluids, on the same surfaces, at fixed strength of the fluid-solid interactions, we were able for the first time to demonstrate that small changes in the shape of the molecules of the fluid deeply affect the liquid-solid friction and the local velocity at the wall. The technique used, called near field laser velocimetry (NFLV) is based on total internal reflection-fluorescence recovery after photobleaching and has been described before [2,14]. We briefly present here its principle and the improvements in the data analysis we have brought, in order to justify the accuracy in the determination of the slip length values. We shall then compare the slip behavior of two different liquids chosen to have the same surface tension, on a series of chemically modified surfaces, with gradually decreasing strength of solid-fluid interactions but constant roughness. The two liquids are squalane and hexadecane. Their liquid-vapor surface tension are, respectively, 27.4 and 27: 6m J=m 2 at 20 � C, as measured using the ring technique
Databáze:	OpenAIRE
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