Dynamic wetting and dewetting of a low-energy surface by pure liquids
Date
1998
Authors
Ralston, J.
Hayes, R.A.
Petrov, J.
Schneemilch, M.G.
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Langmuir, 1998; 14(24):7047-7051
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Abstract
A high resolution optical method was used to acquire contact angle-velocity data for hexadecane and octamethylcyclotetrasiloxane (OMCTS) advancing and receding on a smooth, virtually homogeneous fluorinated surface. The predictive abilities of the hydrodynamic, molecular-kinetic and combined molecular-hydrodynamic models of wetting dynamics were compared. In this context the behavior of hexadecane and OMCTS were distinctly different. Where application of the molecular-kinetic model is most appropriate (hexadecane advancing) the motion of the contact line does agree well with the molecular length. However when hydrodynamics play a role and the combined molecular-hydrodynamic model is required, then the characteristic lengths obtained greatly exceed molecular dimensions.
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