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Merging Icosahedral Boron Clusters and Magnetic Nanoparticles: Aiming toward Multifunctional Nanohybrid Materials
journal contribution
posted on 2017-12-19, 16:20 authored by Elena Oleshkevich, Francesc Teixidor, Anna Rosell, Clara ViñasAll-inorganic-made nanohybrid icosahedral
boron cluster magnetic nanoparticles have been prepared. These magnetic
nanoparticles (MNPs) consist of a magnetic core and an inorganic carboranylphosphinate
shell. The phosphinate is directly bonded to the iron atoms of the
surface in a bidentated coordination mode. The nanoparticles have
been characterized by TEM, X-ray powder diffraction, infrared spectroscopy,
energy dispersive X-ray analysis, high resolution X-ray photoelectron
spectroscopy, magnetometry measurements, and redox titration, among
other techniques. These studies have led to a composition (1-OPH(O)-1,7-closo-C2B10H11)8(2Fe3O4·Fe2O3)13 that implies a surface coverage of 61.3 ± 7.4% by the
ligand. When these MNPs go through sterilization in one autoclave,
the magnetic hysteresis studies suggest minimal change before and
after sterilization; this could erroneously indicate that there have
not been any changes in the MNP composition. However, the Fe2+ titration demonstrates that after sterilization only 1/7 of the
Fe is Fe2+, leading to a core formula of Fe3O4·2Fe2O3 with a concomitant
loss of ligand to a final ratio of 1:70 (carborane: Fe), and a final
coverage by the ligand of 11.2 ± 1.4%. These studies bring relevant
information on the behavior of the widely used MNPs and clearly show
how the sterilization process needed for biological tests may alter
the composition of the core and the loading of a peripheral ligand.
In the particular case reported here, the liberated ligand has not
been oxidized nor altered through the sterilization process.
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nanoparticleligandMultifunctional Nanohybrid Materials All-inorganic-made nanohybrid icosahedral boron clusterC 2 B 10 H 11resolution X-ray photoelectron spectroscopyMNPMerging Icosahedral Boron ClusterscoreX-ray powder diffractionOPHTEMbidentated coordination modeFeenergy dispersive X-ray analysissterilization process
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