Monte Carlo simulations were used to study the magnetic susceptibility of 5-10 nm superparamagnetic iron oxides nanoparticles (SPM NPs) self-assembled into clusters of different sizes and post-assembly processing by our experimental collaborators. Both the experiments and simulations have revealed that the cluster susceptibility depend on the sizes and numbers of NPs making the clusters, and their overall arrangement within the clusters. Our simulations clearly illustrate that different interactions between NPs affect the magnetic states of clusters made of them and their susceptibility. In particular, the susceptibility largely changes with the size of the clusters, which can be in mono-domain superparamagnetic or magnetically blocked states.

Susceptibility of superparamagnetic nanoparticles self-assembled in small clusters

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.