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Non-polar magnetic nanoparticles agglomerate upon cooling. This process isfollowed by in-situ small angle X-ray scattering to assess structuralproperties of the emerging agglomerates. On the length scale of a few particlediameters, no differences are found between the agglomerates of small (d =12nm) and large (d = 22nm) nanoparticles. Hard-sphere like random packing witha local packing fraction of $\eta$ = 0.4 is seen. On larger length scales,small particle form compact superstructures, while large particles arrange intoagglomerates that resemble chain-like structure in SAXS. This can be explainedby directed magnetic dipole interactions that dominate larger particles, whileisotropic van der Waals interaction governs the agglomeration of smallerparticles.

In-situ investigation of temperature induced agglomeration in non-polar magnetic nanoparticle dispersions by small angle X-ray scattering