Removal of Fluid Contaminants by Surface Chemical Displacement
Water and oils can be removed from solid surfaces by displacing them with another fluid, the displacing action being driven by differences in surface tension. The displacing fluid must have a surface tension well below that of the contaminant, and have a high equilibrium spreading pressure. Moderate mutual solubility is necessary to aid penetration of the contaminant film and formation of a surface tension gradient. The volatility of the displacing fluid affects the rate of displacement and the respreading of the contaminant. For water displacement, butyl and amyl alcohols are most effective. Certain fluorinated compounds and low-molecular-weight silicones have been found particularly effective in the displacement of organic fluids. Additives capable of adsorbing on the surface to prevent the displaced contaminant from respreading are sometimes desirable to enhance the effectiveness of the process.
KeywordsSurface Tension Furfuryl Alcohol Displacement Mechanism Amyl Alcohol Surface Tension Gradient
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