AI Article Synopsis
- The study examines how surfactants impact the drying and formation of polymer films from droplets, which have fixed contact lines.
- Even with small amounts of surfactants, the resulting polymer film changes from a ring-like to a flat profile, regardless of variables like polymer concentration and solvent type.
- The research suggests that the uneven distribution of surfactants due to capillary flow leads to a central Marangoni flow that reduces outward flow, offering a new way to control film profiles in inkjet printing.
Article Abstract
We studied how the addition of surfactants alters the drying and film formation processes of polymer solution droplets with contact lines strongly fixed by bank structures. We found that even if the amount of surfactant is quite small, it drastically changes the final profile of the polymer film from a ringlike profile to a flat profile. This property is observed commonly, irrespective of the polymer concentration, droplet volume, and type of solvent. We conjecture that the inhomogeneous distribution of the surfactant caused by the outward capillary flow induces the Marangoni flow directed toward the center of the droplet, which suppresses the outward flow. The present phenomenon implies an effective method for controlling the profile of the polymer film in inkjet printing technologies.
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| http://dx.doi.org/10.1021/jp9077757 | DOI Listing |
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