Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster II

CPP 46.11: Poster

Donnerstag, 12. März 2026, 09:30–11:30, P5

Tuning Foam Kinetics and Structure: The Role of Gas Flowrate in Microgel-Stabilized Foams — •Vera Anna Nina Alina Hesse, Joanne Zimmer, and Regine von Klitzing — Soft Matter at Interfaces, Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 8, D-64289 Darmstadt

The stability and microstructure of foams are critical for their performance in various applications. In this work, aqueous foams are generated by sparging gas (nitrogen) through an aqueous dispersion of PNIPAM microgels, which are used as foam-stabilizers. In specific the effect of the gas flowrate during foam production on the foam structure and kinetics is investigated. In this regard, key parameters such as the foam half lifetime, drainage (liquid content), and bubble size evolution are examined. Our findings reveal a clear dependence: In general, lower flowrates produce smaller initial bubbles, which in turn significantly improve the overall foam stability, as their structural skeleton remains intact for longer periods. On the other hand, a stability optimum is detected, with peak stability occurring at a low flowrate; further reduction however ultimately compromising stability. These findings contribute to a deeper understanding of microgel-stabilized aqueous foams and render the potential for optimizing foam generation processes.

Keywords: aqueous foam; microgel; PNIPAM; flowrate; kinetics