Berlin 2024 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Interfaces and Thin Films
CPP 4.2: Talk
Monday, March 18, 2024, 09:45–10:00, H 0111
Interfacial Jetting of Microgel Dispersions Induced by Surface Acoustic Wave — •Atieh Razavi1, Regine von Klitzing1, Amin Rahimzadeh1, Mehrzad Roudini2, and Andreas Winkler2 — 1TU Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany — 2SAWLab Saxony, Leibniz Institute for Solid State and Materials Research, Dresden
This study investigates Surface Acoustic Wave (SAW)-induced jetting, focusing on microgel dispersions in acoustofluidics. While SAWs have been used by others to create jets from pure liquids, this research explores the jetting of liquids with microgels as surface active polymer networks at interfaces. The work explores how microgel softness influences interfacial stability during rapid jetting induced by SAWs. Soft microgels demonstrate superior adaptability, preventing interface disintegration and sustaining longer jets compared to stiffer particles. Furthermore, higher dispersion concentrations lead to more stable jets. At 1 wt% concentration, MG1 (microgels including 1 mol% cross-linker) creates a very long jet having normalized jet length L/R = 8.47 ± 0.18, compared to pure water which has an L/R of about 6.5. These findings provide critical insights into the role of microgel softness in stabilizing interfaces during millisecond-order extensions. They highlight the potential for soft microgels to significantly impact dynamic interfacial engineering in high-speed phenomena, particularly in acoustofluidics. Understanding this interplay between microgel properties and interfacial stability holds promise for advancements in rapid droplet manipulation and diverse technological applications reliant on dynamic interface control.
Keywords: Microgels; jetting; interfacial stability; surface acoustic waves (SAWs)