Abstract
We examine Landau-Levich coating by a suspension of spherical particles. For particles larger than the liquid film thickness, capillary forces lead to self-assembly of monolayer particle aggregates. We observe two regimes of deposition, find coating fraction as a function of wall speed, and propose a spinodal decomposition (Cahn-Hilliard) model for this pattern formation process.
Highlights
The MIT Faculty has made this article openly available
One may ask what kind of coating is produced from a heterogeneous source: for instance, a bubble in the liquid bath can produce a defect in the resulting coating.[5]
We describe the Landau-Levich flow of a macroscopic suspension of spheres, a type of heterogeneous coating commonly observed in industrial processes, as well as in the deposition of foam bubbles in one’s beer glass. We show that this system exhibits particle aggregation and pattern formation driven by surface tension, and propose an analogy to the spinodal decomposition of binary mixtures
Summary
The MIT Faculty has made this article openly available. Please share how this access benefits you. We observe two regimes of deposition, find coating fraction as a function of wall speed, and propose a spinodal decomposition (CahnHilliard) model for this pattern formation process. Once particles are deposited on the wall, their surrounding liquid thins to less than a particle diameter, wetted particles distort the free surface, and capillary attraction acts to induce aggregation.
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