Liquid spreading on rough metal surfaces |
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Authors: | J F Oliver S G Mason |
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Affiliation: | (1) Pulp and Paper Research Institute of Canada, and Department of Chemistry, McGill University, Montreal, Canada;(2) Present address: Xerox Research Centre of Canada, 2480 Dunwin Drive, L5L 1J9 Mississauga, Ontario |
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Abstract: | The influence of surface roughness on the equilibrium spreading of liquids on aluminium and stainless steel surfaces with
well-characterized rough machine finishes and a well-defined technique of attaining liquid drop equilibrium has been experimentally
studied. The surfaces were prepared under practical conditions, i.e. without rigorous purification or attempting to eliminate
anisotropy or microheterogeneities in surface-free energy. Depending on the type of roughness, i.e. spiral-grooved, radial-grooved
and porous, the advancing contact angle was in approximate agreement with one of the classical contact angle/surface roughness
equations. Capillary channelling along machine grooves profoundly affected the spreading and wetting behaviour and was highly
dependent on the orientation and texture of roughness. Although the observed spreading was generally smooth on all surfaces
it was probable that microscopic surface asperities produce small-scale non-equilibrium contact line movements and are responsible
for the extensive wetting hysteresis during drop retraction. |
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