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Effect of albumin mediated clustering on the magnetic behavior of MnFe2O4 nanoparticles: Experimental and theoretical modeling study

TitoloEffect of albumin mediated clustering on the magnetic behavior of MnFe2O4 nanoparticles: Experimental and theoretical modeling study
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2020
AutoriVasilakaki, M., Ntallis N., Bellusci M., Varsano F., Mathieu R., Fiorani D., Peddis D., and Trohidou K.N.
Parole chiaveAb initio calculations, biocompatibility, Biomedical applications, Blocking temperature, Bovine serum albumins, Calculations, Coatings, Colloids, Freezing temperatures, Intelligent systems, Iron oxides, Magnetic fluids, Magnetic nano-particles, Magnetization measurements, Mammals, Manganese compounds, Medical applications, Monte Carlo methods, Nanomagnetics, Nanoparticles, Saturation magnetization, Theoretical modeling

Over the last two decades, iron oxide based nanoparticles ferrofluids have attracted significant attention for a wide range of applications. For the successful use of these materials in biotechnology and energy, surface coating and specific functionalization is critical to achieve high dispersibility and colloidal stability of the nanoparticles in the ferrofluids. In view of this, the magnetic behavior of clusters of ultra-small MnFe2O4 nanoparticles covered by bovine serum albumin, which is known as a highly biocompatible and environmentally friendly surfactant, is investigated by magnetization measurements, and numerical simulations at an atomic and mesoscopic scale. The coating process with albumin produces a change in the structure, actual size and shape distribution of clusters of exchange coupled particles, giving rise to a distribution of blocking temperatures. The coated system exhibits a superspin glass (SSG) behavior with the SSG freezing temperatures similar to the uncoated ones, providing evidence that the strength of the dipolar interactions is not affected by the presence of the albumin. The DFT calculations show that the albumin coating reduces the surface anisotropy and the saturation magnetization in the nanoparticles leading to lower values of the coercive field in agreement with the experimental findings. Our results clearly demonstrate that the albumin coated clusters of MnFe2O4 particles are ideal systems for energy and biomedical applications since colloidal and thermal stability as well as biosafety is obtained through the albumin coating. © 2019 IOP Publishing Ltd.


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Citation KeyVasilakaki2020