2020/11/26 by Christian Appel, Björn Kuttich, Appel, Christian +5
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Soft Condensed Matter (cond-mat.soft) #Theoretical and Computational Physics #nanoparticles nucleation surface interactions
paper · pdf · doi:10.48550/arxiv.2011.13326
openalex publication_date 2020/11/26 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Non-polar magnetic nanoparticles agglomerate upon cooling. This process is\nfollowed by in-situ small angle X-ray scattering to assess structural\nproperties of the emerging agglomerates. On the length scale of a few particle\ndiameters, no differences are found between the agglomerates of small (d =\n12nm) and large (d = 22nm) nanoparticles. Hard-sphere like random packing with\na local packing fraction of \η = 0.4 is seen. On larger length scales,\nsmall particle form compact superstructures, while large particles arrange into\nagglomerates that resemble chain-like structure in SAXS. This can be explained\nby directed magnetic dipole interactions that dominate larger particles, while\nisotropic van der Waals interaction governs the agglomeration of smaller\nparticles.\n