Pattern formation in slot-die coating

Kasischke, Maren; Hartmann, Simon; Niermann, Kevin; Smarra, Marco; Kostyrin, Denis; Thiele, Uwe; Gurevich, Evgeny L.

Forschungsartikel (Zeitschrift) | Peer reviewed

Zusammenfassung

We experimentally study the occurrence of pattern formation during the slot-die coating of partially wetting liquids onto Polyethylenterephthalat (PET)-substrates outside the coating window. The experimental investigation is supported by numeri- cal simulations of a dynamical model. Our results demonstrate that beyond a critical coating speed the deposition of homogeneous coating layers undergoes an instabil- ity resulting in the self-organized emergence of patterned coatings, i.e., stripes of different orientation and droplet patterns. We investigate the transitions between the different patterns as triggered by changes in the control parameters inherent to slot-die coating, e.g., the liquid viscosity and the coating gap height. The relatively simple theoretical approach is based on lubrication theory. It is already able to repro- duce most of the patterns observed experimentally, and reveals a wettability-driven instability mechanism.

Details zur Publikation

FachzeitschriftPhysics of Fluids
Jahrgang / Bandnr. / Volume35
Ausgabe / Heftnr. / Issue7
Seitenbereich074117null
StatusVeröffentlicht
Veröffentlichungsjahr2023
Sprache, in der die Publikation verfasst istEnglisch
DOI10.1063/5.0150340
StichwörterThin film deposition; Thin films; Self assembly; Liquid solid interfaces; Interfacial tension; Fluid mechanics; Newtonian fluids; Lubrication flows

Autor*innen der Universität Münster

Hartmann, Simon
Professur für Theoretische Physik (Prof. Thiele)
Thiele, Uwe
Professur für Theoretische Physik (Prof. Thiele)