Abstract
Clustering of magnetic nanoparticles can dramatically change their collective magnetic properties and it consequently may influence their performance in biomedical and technological applications. Due to tailored surface modification of magnetic particles such composites represent stable systems. Here, we report ferronematic mixtures that contain anisotropic clusters of mesogen-hybridized cobalt ferrite nanoparticles dispersed in liquid crystal host studied by different experimental methods - magnetisation measurements, small angle X-ray scattering (SAXS), small angle neutron scattering (SANS) and capacitance measurements. The obtained results showed non-monotonic dependencies of magnetisation curves as well as of the Freedericksz transition on the magnetic nanoparticles concentration. This can be explained by the formation of clusters, whose structure was determined by SAXS measurements. Complementary to the magnetisation measurements, SANS measurements of the samples were performed for different magnetic field strength to obtain information on the orientation of the liquid crystal molecules.
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