SKM 2023 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 42: Poster: Active Matter, Soft Matter, Fluids

DY 42.14: Poster

Thursday, March 30, 2023, 13:00–16:00, P1

Assembly of iron oxide nanocuboids directed by surface, ligand, and magnetic interactions — •Sindy J. Rodríguez Sotelo^1,2, Mario C.G. Paseggi Jr.^1,2, Carlos García³, and Igor Stanković⁴ — ¹Instituto de Física del Litoral IFIS-CONICET, Santa Fe, Argentina — ²Facultad de Ingeniería Química, Universidad Nacional del Litoral UNL, Santa Fe, Argentina — ³Departamento de Física and Centro Científico Tecnológico de Valparaíso-CCTVal, Universidad Técnica Federico Santa María, Valparaíso, Chile — ⁴Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade, University of Belgrade, Serbia

The direction of the dipole moment in the magnetite spherical nanoparticles is unrelated to the morphology particle. For non-spherical particles, a coupling between particle form and magnetic moment direction might result in unexpected behaviours, especially when the moment is not aligned along a particle symmetry axis [1,2]. We introduce energy models accounting for the directionality and magnitude of the van der Waals and dipolar interactions as a function of the shape of the nanocubes, illustrating the importance of the directional dipolar forces for the formation of the nanocube clusters, the dominance of the van der Waals multi-body interactions and exclusion forces of ligands. We illustrate how minimal energy structures depend on the assembly size, shape of the particles, and the balance of surface and magnetic dipolar coupling.

References [1] I. Stanković, et al. Nanoscale 12, 19390, 2020. [2] L. Balcells et al. Nanoscale 11, 14194, 2019.