Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 38: Magnetic Particles / Clusters & Biomagnetism

MA 38.1: Invited Talk

Thursday, March 20, 2025, 15:00–15:30, H18

Liquid-mediated surface-surface interactions investigated by close-to-surface magnetic particle transport — •Rico Huhnstock, Yahya Shubbak, and Arno Ehresmann — Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel

Studying phenomena at the liquid-solid interface has tremendous significance for the physical, chemical, biological, and nanostructure sciences [1]. Experimental access to the underlying interactions is a non-trivial task, demonstrated for instance by the difficulties connected with performing atomic force microscopy measurements in liquids. In this talk, we propose a novel technique to inspect liquid-mediated surface-surface interactions based on guiding magnetic microparticles (MPs), surrounded by a quiescent fluid, along defined trajectories in the vicinity of a solid interface. The MP motion is induced by harnessing engineered magnetic stray field landscapes (MFLs) emerging from customized magnetic domain patterns imprinted into a topographically flat substrate. We will give an overview of the MFL fabrication process and discuss the influence of MP [2], liquid, and MFL [3] properties on the MP motion. Finally, we highlight, that the MP motion dynamics can be studied to identify changes in liquid-mediated DLVO interactions between surfaces of the MP and the underlying substrate.

[1] Chen et al. (2022), Advanced Materials Interfaces, 9(35):2201864.

[2] Huhnstock et al. (2021), Scientific Reports, 11(1):21794.

[3] Huhnstock et al. (2024), Small, 20(10):2305675.

Keywords: Magnetic particles; Magnetic stray fields; Magnetic domain patterns; Active colloids; Liquid-mediated surface-surface interactions