Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 33: Complex Fluids, Colloids, Micelles and Vesicles II

CPP 33.1: Hauptvortrag

Mittwoch, 11. März 2026, 10:00–10:30, ZEU/LICH

Shape-induced superstructure formation in concentrated ferrofluids — •Sabrina Disch — University of Duisburg-Essen, Essen, Germany

The response of magnetic nanoparticles to applied static and dynamic magnetic fields is the subject of intense research in view of its fundamental technological importance [1]. The field-assisted self-organization of shape-anisotropic nanoparticles in dispersions is particularly desired for liquid crystalline or optically anisotropic materials and as a prerequisite for self-organization into long range ordered arrangements [2]. A strong structure-directing influence of the particle shape on the symmetry of mesocrystalline arrangements has been established for nanocubes with a varying degree of cubicity [3].

In this contribution, we give a detailed account on the impact of nanoparticle shape and size on the interparticle correlations in colloidal dispersions of maghemite nanoparticles. Despite the similar particle size, magnetic moment, and volume concentration (>5 vol-%), we observe a significantly distinct aggregation behavior of nanospheres and nanocubes using small-angle neutron scattering [4]. The field-dependent arrangement of cuboidal nanoparticles into mesocrystalline assemblies and their geometric orientation will be discussed as observed by field-dependent small-angle scattering experiments.

[1] Q. A. Pankhurst et al., J. Phys. D: Appl. Phys. 36, R167 (2003).

[2] S. Disch, E. Wetterskog et al., Nano Letters 11, 1651 (2011).

[3] E. Wetterskog, S. Disch et al., Nanoscale 8, 15571 (2016).

[4] P. Bender, S. Disch et al., J. Appl. Cryst. 55, 1613 (2022).

Keywords: magnetic nanoparticles; small-angle scattering; self-organization