Abstract
Wetting to drying patterns during the course of drying a water droplet on a printed paper sheet were observed. Blue colored papers with different color densities were prepared with the use of the hydrophilic blue ink and an ink-jet printer on the two kinds of paper sheets for document and pictures. The notched broad ring-like wetting patterns developed fast initially after setting and reached a saturated size of the drying patterns. Size of the broad ring was discussed as a function of time elapsed. A liquid drop remained at the central area for a certain intermediate period and vanished. Hydrophilic blue ink on the paper sheet enhanced the wetting rate significantly. Affinity of a water droplet with the solutes of blue ink on the paper substrate plays an important role on the wetting process in addition to that with the substrate itself. The cooperative drying processes from wetting to solidification took place.
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Okubo, T. Wetting to drying patterns of a water droplet on a printed paper sheet. Colloid Polym Sci 294, 19–26 (2016). https://doi.org/10.1007/s00396-015-3784-4
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DOI: https://doi.org/10.1007/s00396-015-3784-4