Using the analytical centrifuge to characterize of magnetic particles

abstract

English

Magnetic Fe3O4 nanoparticles were prepared by co-precipitation method according to the literature. Prepared Fe3O4 nanoparticles were dispersed in water solution of surfactant. The dispersion system was characterized by the analytical centrifuge LUMiSizer (LUM, Germany). The separation process of the magnetic nanoparticle dispersion was characterized by the very polydisperse sedimentation (no sharp front) of particles with relatively narrow particle size distribution of fine particles which move with different speed. This type of sedimentation points out colloidal stable dispersions against particle aggregation. Prior to separation, particle concentration was equally distributed along the complete sample length, i.e. transmission was constant at a low level (first transmission profile with the lowest transmission). During sedimentation, the concentration of particles decreased in the region of meniscus and transmission increased. The last profile (highest transmission) indicated that the smallest particles were not yet fully separated out from the supernatant within the applied centrifugation time. Only the very small sediment was observed due to a dense packing of particles characteristic for colloidal stable systems with the repulsive particle-particle interaction. This technique was also used to determine the nanoparticle hydrodynamic density and particle size distribution.

magnetic nanoparticles, analytical centrifuge, characterization

MONDEK, J.; DOSKOČIL, L.; SZEWIECZKOVÁ, J.; ENEV, V.; WASSERBAUER, J.

23. 4. 2015

978-80-210-7825-3

CEITEC PHD RETREAT

1

NEUVEDENO

105

105

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