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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 43: Droplets, Wetting, Complex Fluids, and Soft Matter (joint session DY/CPP)
CPP 43.6: Vortrag
Freitag, 21. März 2025, 11:00–11:15, H47
Magnetic dynamics in ferromagnetic liquid crystal emulsions — •Christoph Klopp1, Hajnalka Nádasi1, Darja Lisjak2, and Alexey Eremin1 — 1Otto von Guericke University, Institute of Physics, 39106 Magdeburg, Germany — 2Jozef Stefan Institute, Department for Materials Synthesis, 1000 Ljubljana, Slovenia
We explore magnetic liquid crystal (LC) emulsions for applications as manipulatable chemical sensors in giant cells of Characean algae. Such emulsions can be controlled by magnetic fields and provide targeted drug delivery or sensing [1]. The investigated emulsions consist of a ferromagnetic liquid crystal [2] dispersed in an aqueous solution. We investigate the dynamic magnetic response using AC-susceptometry [3] as a function of the carrier medium viscosity and the particle or droplet size distribution. The emulsions' magnetic spectra differ drastically from those in the bulk of the hybrid liquid crystal mixture. We demonstrate the influence of the liquid crystal director configuration at the water-droplet interface by analyzing the effect of different surfactants (mainly SDS and PVA) in the aqueous phase.
[1] F. von Rüling et al., Liquid Crystals, 2024, 51, 1546
[2] A. Mertelj, et al., Nature, 2013, 504, 237-241
[3] M. Küster et al., J. Magn. Magn. Mater., 2023, 588, 171368
This study was supported by DFG with projects ER 467/14-1 and NA1668/1-3.
Keywords: Magnetic Nanoplatelets; Susceptometry; Liquid Crystals