Versatile strategy for homogeneous drying patterns of dispersed particles

Marcel Rey, Johannes Walter, Johannes Harrer, Carmen Morcillo Perez, Salvatore Chiera, Sharanya Nair, Maret Ickler, Alesa Fuchs, Mark Michaud, Maximilian J. Uttinger, Andrew B. Schofield, Job H. J. Thijssen, Monica Distaso, Wolfgang Peukert and Nicolas Vogel ()
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Marcel Rey: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Johannes Walter: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Johannes Harrer: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Carmen Morcillo Perez: The University of Edinburgh
Salvatore Chiera: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Sharanya Nair: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Maret Ickler: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Alesa Fuchs: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Mark Michaud: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Maximilian J. Uttinger: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Andrew B. Schofield: The University of Edinburgh
Job H. J. Thijssen: The University of Edinburgh
Monica Distaso: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Wolfgang Peukert: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Nicolas Vogel: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract After spilling coffee, a tell-tale stain is left by the drying droplet. This universal phenomenon, known as the coffee ring effect, is observed independent of the dispersed material. However, for many technological processes such as coating techniques and ink-jet printing a uniform particle deposition is required and the coffee ring effect is a major drawback. Here, we present a simple and versatile strategy to achieve homogeneous drying patterns using surface-modified particle dispersions. High-molecular weight surface-active polymers that physisorb onto the particle surfaces provide enhanced steric stabilization and prevent accumulation and pinning at the droplet edge. In addition, in the absence of free polymer in the dispersion, the surface modification strongly enhances the particle adsorption to the air/liquid interface, where they experience a thermal Marangoni backflow towards the apex of the drop, leading to uniform particle deposition after drying. The method is independent of particle shape and applicable to a variety of commercial pigment particles and different dispersion media, demonstrating the practicality of this work for everyday processes.

Date: 2022
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DOI: 10.1038/s41467-022-30497-z

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