At the fluid-solid interface, chemical and physical interactions play a role in molecular slip and flow influencing a broad spectrum of industrial, commercial, and research applications.  Hydrodynamic theories state that when a fluid comes into contact with an ultra-smooth surface (&lt; 5-7 nm RMS roughness), the no-slip boundary condition can be violated. This could result in complete slip and can greatly improve fluid transport properties. To investigate this transition, a dynamic wetting technique was combined with vibrational spectroscopy and ellipsometry to allow direct investigation of molecular fluids at smooth and rough silver surfaces (RMS roughness between 1 and 30 nm). The wetting technique allows control of the wetting velocity, which is critical to provide perturbation of wetting film thickness. Such films of chlorobenzene, o-dichlorobenzene, and hexamethylphosphoramide were analyzed for thickness and molecular orientation. The present results of planar molecules show no film formation which supports the possibility of complete molecular slip. Hexemethylphosphoramide is analyzed due to its non-planar property.

Analysis of interactions at fluid-solid interface: Exploring the complete slip boundary condition

249th National Meeting (2015)

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