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Wetting and Evaporation of Solvents on Thin Soluble Substrates
Version 1 : Received: 9 September 2020 / Approved: 18 September 2020 / Online: 18 September 2020 (12:07:46 CEST)
A peer-reviewed article of this Preprint also exists.
Wolf, C.; Gambaryan-Roisman, T. Wetting and Evaporation of Solvents on Thin Soluble Substrates. Colloids Interfaces 2020, 4, 48. Wolf, C.; Gambaryan-Roisman, T. Wetting and Evaporation of Solvents on Thin Soluble Substrates. Colloids Interfaces 2020, 4, 48.
In this work, the wetting and evaporation behaviour of non-polar solvent droplets on thin soluble coatings is investigated experimentally. The wetting process on spin coated polymer layers by the solvent is captured using shadowgraphy. Initial spontaneous dynamic wetting as well as later stages of wetting are recorded and evaluated. Furthermore, structures obtained by wetting and subsequent evaporation of solvents on polymer coatings are studied by confocal microscopy. The solubility of the substrate has been varied by using polymers with different molecular masses. We observe that initial spreading dynamics does not depend on the molar mass in the studied range. However, we find a strong influence of the molar mass on the late stage wetting dynamics and on the surface structure after solvent evaporation.
wetting of soluble substrates; spreading; evaporation; polymer coating; surface topography
Physical Sciences, Chemical Physics
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