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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 43: Droplets, Wetting, Complex Fluids, and Soft Matter (joint session DY/CPP)
CPP 43.7: Talk
Friday, March 21, 2025, 11:30–11:45, H47
Drying effects in soft colloidal monolayers — •Kai Luca Spanheimer1, Matthias Karg2, Nicolas Vogel3, Liesbeth Janssen4, and Hartmut Löwen1 — 1Institut für Theoretische Physik II: Weiche Materie Heinrich-Heine-Universität, 40225 Düsseldorf, Germany — 2Physikalische Chemie I: Kolloide und Nanooptik Heinrich-Heine-Universität, 40225 Düsseldorf, Germany — 3Lehrstuhl für Partikelsynthese Friedrich-Alexander-Universität,91058 Erlangen, Germany — 4Soft Matter and Biological Physics Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
Langmuir-Blodgett deposition is a staple of colloidal monolayer research. It is used in sample preparation for imaging techniques, that spatially resolve colloid patterns. Recent experimental observations have shown that drying can strongly rearrange micron sized microgel patterns after their deposition. The usual dictum that these drying effects do not play a role for colloidal deposition can thus not be held up as a general rule. While capillary effects are well known to be strong at microscopic length scales and play a significant role in drying processes they have been mostly neglected concerning Langmuir-Blodgett deposition. In order to better understand the mechanism of drying we propose a model based on capillary attraction as well as hard core and soft shell repulsion. This model reproduces colloid patterns observed at interfaces as well as ones that occur after drying in the corresponding parameter regimes. From here we are able to derive parameter ranges where drying can play a role in rearranging patterns of colloids and where it can't.
Keywords: Colloids; Drying; Capillary interactions; Microgels; Langmuir-Blodgett Deposition