Controlled Uniform Coating from the Interplay of Marangoni Flows and Surface-Adsorbed Macromolecules

Hyoungsoo Kim, François Boulogne, Eujin Um, Ian Jacobi, Ernie Button, Howard A. Stone

Research output: Contribution to journalArticlepeer-review

157 Scopus citations

Abstract

Surface coatings and patterning technologies are essential for various physicochemical applications. In this Letter, we describe key parameters to achieve uniform particle coatings from binary solutions. First, multiple sequential Marangoni flows, set by solute and surfactant simultaneously, prevent nonuniform particle distributions and continuously mix suspended materials during droplet evaporation. Second, we show the importance of particle-surface interactions that can be established by surface-adsorbed macromolecules. To achieve a uniform deposit in a binary mixture, a small concentration of surfactant and surface-adsorbed polymer (0.05 wt% each) is sufficient, which offers a new physicochemical avenue for control of coatings.

Original languageEnglish (US)
Article number124501
JournalPhysical review letters
Volume116
Issue number12
DOIs
StatePublished - Mar 24 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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