Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster 2

CPP 17.16: Poster

Dienstag, 6. September 2022, 11:00–13:00, P2

In-situ Monitoring of Hard-Core Soft-Shell Microgels During Monolayer Drying — •Julian Ringling, Keumkyung Kuk, and Matthias Karg — Heinrich-Heine-Universität, Düsseldorf, Germany

Hard-core soft-shell (HCSS) microgels are interesting colloids with the potential to be used as model systems to understand crystallization and melting processes [1]. They spread at the air/water interface and self-assemble into 2D monolayers in which the cores do not touch directly due to shell-shell repulsion. Compression of such a monolayer allows control over the inter-particle distance by compressing the soft and deformable shell [2]. After transferring a compressed monolayer to a substrate, various structures can be observed [3]. Understanding and controlling the formation of those structures is essential for the use of the system as a model for crystallization.

Previously our group discovered a difference in monolayer structure at the air/water interface in comparison to the dried monolayer after transfer onto a substrate when using micron-sized silica-poly(N-isopropylacrylamide) HCSS microgels. To understand the phase transition/structural change occurring, we have monitored this phase transition/structural change using fluorescence and light microscopy. Here we present results from in-situ observations of drying 2D colloidal monolayers focussing on the effect of different parameters on drying and assembly behaviour.

[1] G. Wie et al., Soft Matter, 2013, 9, 9924-9930

[2] J. Tang et al., ACS Omega, 2018, 3, 12089 -12098

[3] S. Ciarella et al., Langmuir, 2021, 37, 5364-5375