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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: Poster Session II

CPP 35.41: Poster

Mittwoch, 29. März 2023, 11:00–13:00, P1

Structural properties of a semi-dilute suspensions of magnetic multicore nanoparticles — •Ekaterina Novak¹, Andrey Kuznetsov², Elena Pyanzina¹, Marina Gupalo¹, Tatyna Belyaeva¹, and Sofia Kantorovich² — ¹Ekaterinburg, Russia — ²University of Vienna, Vienna, Austria

During the last thirty years, magnetic soft matter systems have become highly promising candidates for medical applications such as magnetic hyperthermia and magnetic drug targeting. The subject of this work, magnetic multicore nanoparticles (MMNPs), are rigid clusters of single-domain magnetic nanocrystals (cores or grains ) embedded in a polymer or other non-magnetic matrix. While the grains typically have a characteristic linear size of the order of 10 nm, the size of MMNPs can range from tens to a few hundred nanometers. Here, using Langevin dynamics computer simulations, we investigated diluted suspensions of MMNPs composed by grains, whose positions are fixed within the particle body, but their magnetic moments are free to rotate, corresponding to the grains with negligibly low magnetic anisotropy.

We calculated cluster size distributions and compared them to their counterparts in a system of single-domain magnetic nanoparticles. A drastic difference was found: for two MMNPs to aggregate they need to form a bridge a stable array of grains from both multicores that are connected via dipolar interactions. The more bridges the two MMNPs form, the more stable is their aggregate.