Regensburg 2025 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 44: Droplets, Wetting, Complex Fluids, and Soft Matter (joint session DY/CPP)

DY 44.10: Talk

Friday, March 21, 2025, 12:15–12:30, H47

Beyond rings and chains: exploring porous crystals and flexible networks with magnetic colloids — •Carina Karner — Technische Universität Wien

We report on the self-assembly of magnetic colloids engineered with two distinct magnetic patches positioned at their poles, an advancement from traditional Janus particles with a single magnetic dipole. While Janus particles are known to form a variety of superstructures including chains, rings, and close-packed arrangements [1], the two-patch design significantly expands the range of achievable structures. Our simulation study reveals the formation of porous networks with adjustable flexibility, variable pore sizes, and controllable crystalline order. Notably, we observe the formation of a porous Kagome lattice, reminiscent of the experimental Kagome lattice observed colloids with two hydrophobic patches, the well known Janus-triblock system [2]. This enhanced self-assembly behavior in two-patch magnetic particles opens up further possibilities for creating fully tunable, field-responsive ferrofluids. Such systems could useful for applications requiring externally modulated viscosity, such as adaptive damping systems in automotive and aerospace engineering. [1] Vega-Bellido, G. I., DeLaCruz-Araujo, R. A., Kretzschmar, I., & Córdova-Figueroa, U. M. (2019). Self-assembly of magnetic colloids with shifted dipoles. Soft Matter, 15(20), 4078-4086. [2] Chen, Q., Bae, S. C., & Granick, S. (2011). Directed self-assembly of a colloidal kagome lattice.Nature,469(7330), 381-384.

Keywords: Magnetic Colloids; Self-Assembly; Patchy Particles; Molecular Dynamics; Ferrofluids