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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 44: Wetting, Micro- and Nanofluidics

CPP 44.7: Hauptvortrag

Donnerstag, 14. März 2013, 17:00–17:30, H39

Wetting behaviour in inkjet printed droplets — •Patrick Smith and Jonathan Stringer — University of Sheffield, Kroto Research Institute, Broad Lane, Sheffield, S3 7HQ, England

Understanding how droplets behave is essential to using inkjet printing if inkjet is to be successful as a manufacturing process. This talk discusses the lifetime of droplets from when they are ejected from a nozzle, their impact with a substrate and their drying behaviour.

In this contribution I will discuss how, by varying the height of a printhead nozzle above a substrate, the final dried droplet diameter of a polymer ink can be decreased. I will also show that at higher concentrations of polymer, the solute forms a skin on the surface of the inkjet printed droplet, which inhibits the in-flight evaporation of the solvent. I will also discuss a study into the spreading of inkjet printed droplets of a polystyrene/toluene solution with varied molar masses on solid dry surfaces. The experimental results were compared to theoretical models and found to have a good fit. The spreading factor was found to decrease as molar mass increased, which is explained in terms of increased viscosity. Finally, I will discuss how the size of a suspended particle can influence the size of the final dried morphology of a printed feature.