6 papers
Dynamic Wetting by Concentrated Granular Suspensions
Reza Azizmalayeri, Peyman Rostami, Thomas Witzmann +2
Many functional materials, such as paints and inks used in applications like coating and 3D printing, are concentrated granular suspensions. In such systems, the contact line dynam…
Positive Feedback Drives Sharp Swelling of Polymer Brushes near Saturation
Simon Schubotz, Eva Bittrich, Holger Merlitz +4
We resolve the Schröder paradox for PNiPAAm brushes, showing experimentally that swelling at 100\% relative humidity (RH) matches the liquid state. This occurs via a sharp increas…
Experimental and simulation study of resin infiltration in carbon fiber rovings
Dominik Burr, Rudi Reichenbächer, Christina Scheffler +2
Continuous-fiber-reinforced polymers are vital for lightweight structural applications, where fiber-matrix wetting critically influences composite performance. Understanding dynami…
How Microplastics cross the Buoyancy Barrier: A multi-scale Study
Thomas Witzmann, Anja F. R. M. Ramsperger, Hao Liu +12
Microplastics (MPs), though less dense than water, are frequently recovered from sediments in aqueous environments, indicating they can cross the buoyancy barrier. We quantify eco-…
Rheological Insights from the Oscillation Dynamics of Viscoelastic Sessile Drops
Peyman Rostami, Alfonso A. Castrejón-Pita, Günter K. Auernhammer
This study investigates the oscillation behavior of a sessile drop placed on a hydrophobic substrate subjected to vertical vibrations with varying frequencies and amplitudes. We ex…
Coalescence of viscoelastic drops on a solid substrate
Peyman Rostami, Alexander Erb, Reza Azizmalayeri +3
This study investigated the coalescence of polymer solution drops on the solid substrates. When two drops meet at their contact line on a substrate, the liquid bridge connecting th…