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arXiv · 1509.08109

Mass transfer during drying of colloidal film beneath a patterned mask that contains a hexagonal array of holes

Yuri Yu. Tarasevich·Irina V. Vodolazskaya
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Abstract

We simulated an experiment in which a thin colloidal sessile droplet is allowed to dry out on a horizontal hydrophilic surface when a mask just above the droplet predominantly allows evaporation from the droplet free surface directly beneath the holes in the mask [Harris D J, Hu H, Conrad J C and Lewis J A 2007 \textit{Phys. Rev. Lett.} \textbf{98} 148301]. We considered one particular case when centre-to-centre spacing between the holes is much less than the drop diameter. In our model, advection, diffusion, and sedimentation were taken into account. FlexPDE was utilized to solve an advection-diffusion equation using the finite element method. The simulation demonstrated that the colloidal particles accumulate below the holes as the solvent evaporates. Diffusion can reduce this accumulation.

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Yuri Yu. Tarasevich, Irina V. Vodolazskaya. 2015-09-27. Mass transfer during drying of colloidal film beneath a patterned mask that contains a hexagonal array of holes. https://doi.org/10.1088/1742-6596/681/1/012033

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