Microstructure and Dynamics of Magnetic Iron Nanoparticles Aggregates in Protein Gels

Abstract

The 60 nm metallic iron nanoparticles and its aggregates in gelatine gel were studied by means of optical microscopy, X-ray microtomography, atomic force scanning microscopy and the Mössbauer spectroscopy. The isolated nanoparticles in gel exhibit fast bounded diffusion described by Brownian movement. In the external magnetic field these magnetic particles form spectacular linear aggregates whose local dynamical and magnetic properties were determined from the Mössbauer spectra.

Defective iron-oxide nanoparticles synthesised by high temperature plasma processing: a magnetic characterisation versus temperature

“…Moreover, the complex competing inter-particle interactions among magnetic nanoparticles may modify their dynamic response. In addition, if the interactions among nanoparticles have some degree of coherence, the formation of long-range domain-like structures may also occur [12]. Because these phenomena are a consequence of finite-size effects, they can be tuned or triggered by varying particle size and inter-particle distance [13][14][15].…”