Characterization of the solvent specific evaporation from a fluoropolymer surface roughened by layered double oxide (LDO) particles

Tóth, Ildikó and Janovák, László and Bogya, Erzsébet S. and Deák, Ágota and Dékány, Imre and Kukovecz, Ákos (2020) Characterization of the solvent specific evaporation from a fluoropolymer surface roughened by layered double oxide (LDO) particles. JOURNAL OF MOLECULAR LIQUIDS, 305. pp. 1-10. ISSN 0167-7322

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Abstract

Solid/ liquid interaction strongly depends, among other things, on the chemical and physical properties of fluids, therefore, there are unexploited analytical possibilities in investigating the surface wetting and evaporation behavior. Strongly hydrophobic rough surface thin films were prepared by spray-coating a fluoropolymer film with incorporated layered double oxide (LDO) microparticles. We studied the evaporation of ethanol–water mixtures from the low energy (8.4 ± 2.6 mJ/m2) composite surfaces by simultaneous high-speed visible imaging, infrared imaging and weight loss monitoring. The wetting behavior changed from Cassie's wetting mode (pure water) to Wenzel's (pure ethanol) as a function of solvent composition. The vaporization process could be divided into three stages described by constant evaporate rates and the heat transfer coefficient between the studied layer and water is KT = 1768 W/(m2 K). We have found strong correlations between parameters of the measured evaporation profiles and certain physical properties of the solvents. It is possible to estimate the viscosity, the boiling point, or the surface tension of a studied liquid merely from the total evaporation time. This novel solvent identification method can serve as a new application field for such low energy hybrid surfaces

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