Evaporation from thin porous Coatings: Pore size effects and predictive equation for homogeneous coatings

Hosseini, Mohsen; Rodriguez, Alejandro; Torres, James R.; Ducker, William A.

doi:10.1016/j.jcis.2024.09.114

Title: Evaporation from thin porous Coatings: Pore size effects and predictive equation for homogeneous coatings

Journal Article · 14 September 2024 · Journal of Colloid and Interface Science

DOI: https://doi.org/10.1016/j.jcis.2024.09.114 · OSTI ID:2447315

^[1]; Rodriguez, Alejandro ^[1];

^[2];

^[1]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Evaporation of small water droplets on solids is hindered because surface tension pulls the droplet into a spherical cap that has a small perimeter. Our solution is to coat a solid with a very thin, porous layer into which the droplet flows to create a large-area disk with concomitant high rate of evaporation. We investigate evaporation by varying factors that have not been previously considered: pore size and distribution, contact angle, temperature, and relative humidity (RH). A larger pore size resulted in faster evaporation, which we explain through faster transport within the coating. Even faster evaporation occurred for a bilayer structure with small particles on the air side and larger particles on the solid side. Further, the water advancing contact angle had an insignificant effect in the range from < 10° through to 60°. Our results for different pore sizes, temperature, humidity, and contact angle all collapse onto a single curve when appropriately normalized. This validates an equation that can be used for the evaporation from a homogeneous coating that depends only one empirical factor and the droplet volume. Since the volume is often user-controlled, we envisage that this equation can be used to predict evaporation and guide design of fast-drying coatings.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2447315

Journal Information:: Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: C Vol. 678; ISSN 0021-9797

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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