Tuning kinetics to control droplet shapes on chemically stripe patterned surfaces

H.P. Jansen, Kai Sotthewes, C. Ganser, C. Teichert, Henricus J.W. Zandvliet, Ernst S. Kooij

Research output: Contribution to journalArticleAcademicpeer-review

24 Citations (Scopus)

Abstract

The typically elongated shape of droplets on chemically microstriped surfaces has been suggested to depend strongly on the kinetics during deposition. Here, we unequivocally establish the importance of impact kinetics by comparing the geometry of pico- to microliter droplets deposited from an inkjet nozzle with those obtained by conventional deposition from a syringe. For large Weber numbers, the strongly enhanced spreading during the impact in combination with direction-dependent pinning of the contact line gives rise to more spherical droplets with a low aspect ratio. The impact energy can be minimized by the prolonged firing of small picoliter droplets to form larger droplets or, as shown in the past, by using high-viscosity liquids. In the first case, the impact energy is absorbed by the liquid already present, therewith reducing the impact diameter and consequently forming markedly more elongated droplets
Original languageEnglish
Pages (from-to)13137-13142
Number of pages6
JournalLangmuir
Volume28
Issue number37
DOIs
Publication statusPublished - 2012

Keywords

  • METIS-288995
  • IR-84698

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