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    Liquid imbibition into 3D printed porous substrates

    Year: 2021

    Journal: Chem. Eng. Sci., Volume 245, DEC 14

    Authors: Zhang, Jun; Tuohey, Josh; Amini, Negin; Morton, David A., V; Hapgood, Karen P.

    Organizations: International Fine Particle Research Institute (IFPRI); Deakin University

    Keywords: 3D printing; Surface coating; Porous structure; Liquid imbibition

    Wettability analysis for granular material has been relying on the Washburn theory that assumes a particle bed as an array of parallel capillaries. However, the complexity in real-life powder beds or other industrial porous media usually are not fully taken into account. In the current study, we use three different porous substrates building from simple to complex as artificial models to represent porous particle beds for studying liquid imbibition. High-resolution Polyjet 3D printing technique was used to produce multiple copies for repetitive experimental study. The surface wettability was also tuned from hydrophilic to hydrophobic. The results of wetting analysis demonstrate that the porous structure plays a more significant effect on the liquid capillary rise than the material surface wettability. These experimental results also deviate from theoretical predictions using drop penetration time and Washburn equations, but pave the way for new production method for reproducible models of irregular powder beds. (c) 2021 Elsevier Ltd. All rights reserved.
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