Dynamical SANSPOL study on field-induced assembly of iron oxide nanoparticles
SANS studies have shown that in iron oxide ferrofluid an unusual ordering phenomenon of the magnetic nanoparticles occurred when static magnetic field was applied. The structure of the self-assembly has been found to be FCC, different from what were reported for magnetite and Co ferrofluids. The field-induced ordering process is found irreversible. The crystalline quality is improved upon field oscillation. Surprisingly, the diffraction peak intensity shows a significant increase at fields around zero. By using time-resolved SANSPOL technique on D22, we intend to study the dynamical processes of the field-induced assembly in magnetic colloids and give more insight into the effect of the inter-particle magnetic correlations on the formation of local nanoparticle ordering.
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FU Zhendong; FENG Erxi; Lijie Hao; HONECKER Dirk; PORCAR Lionel; Yixi Su and WANG Xiao. (2018). Dynamical SANSPOL study on field-induced assembly of iron oxide nanoparticles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-480
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