Abstract
Abstract Dip-coating is used to apply a boundary lubricant film of perfluoropolyether (PFPE) on rigid magnetic disks. At lower solute concentration and lower withdrawal speeds, solvent evaporation is faster than the motion of the drying line leading to capillary feeding during film formation. At higher solute concentrations and higher withdrawal speeds, film formation is described by the Landau-Levich drainage model modified for evaporation. The minimum in the deposited film thickness versus withdrawal speed is attributed to a mixed regime corresponding to a crossover between the capillarity and drainage regimes. The solute concentration and therefore solvent type is a strong determinant of which regimes are observed. The dip-coating process is well-described by semi-experimental equations. The relationship between solute concentration and solvent compatibility, a determinant in the dip-coating process, is explained on the basis of solvent power and solubility parameters.
Published Version
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