Insight into synthesis and characterisation of Ga0.9Fe2.1O4 superparamagnetic NPs for biomedical applications

Author:

Mesaros Amalia1,Garzón Alba2,Nasui Mircea1,Bortnic Rares1,Vasile Bogdan3,Vasile Otilia3,Iordache Florin3,Leostean Cristian4,Ciontea Lelia1,Ros Josep5,Pana Ovidiu4

Affiliation:

1. Technical University of Cluj-Napoca

2. Institut Català de Nanocència i Nanotecnologia (ICN2)

3. University "Politehnica" from Bucharest, National Research Centre for Micro and Nanomaterials

4. National Institute for Research and Development of Isotopic and Molecular Technologies

5. Universitat Autònoma de Barcelona

Abstract

Abstract A Ga3+-substituted spinel magnetite nanoparticles (NPs) with the formula Ga0.9Fe2.1O4 were synthesized using both the one-pot solvothermal decomposition method (TD) and the microwave-assisted heating method (MW). Stable colloidal solutions were obtained by using triethylene glycol, which served as a NPs stabilizer and as a reaction medium in both methods. A narrow size cridistribution of NPs, below 10 nm, was achieved through selected nucleation and growth. The composition, structure, morphology, and magnetic properties of the NPs were investigated using FTIR spectroscopy, thermal analysis (TA), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and magnetic measurements. NPs with the expected spinel structure were obtained in the case of the TD method, while the MW method produced, additionally, an important amount of gallium suboxide. The NPs, especially those prepared by TD, have superparamagnetic behavior. In the case of MW preparation, the presence of a secondary phase affects both the dimensional distribution and the magnetic behavior of NPs. The NPs were tested in vitro on amniotic mesenchymal stem cells. It was shown that the cellular metabolism is active in the presence of Ga0.9Fe2.1O4 NPs and also preserves an active biocompatible cytoskeleton.

Publisher

Research Square Platform LLC

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