A facile synthetic route toward air-stable magnetic nanoalloys with Fe-Ni/Fe-Co core and iron oxide shell
Φόρτωση...
Ημερομηνία
Συγγραφείς
Douvalis, A. P.
Zboril, R.
Bourlinos, A. B.
Tucek, J.
Spyridi, S.
Bakas, T.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Journal of Nanoparticle Research
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Air-stable bimetallic spherically shaped Fe-Ni and Fe-Co magnetic nanoparticles (MNPs), having an average size of 15 nm and core-shell structure, were synthesized by a simple wet chemical method under ambient conditions. For the first time, sodium borohydride reduction method, commonly applied for the syntheses of metal nanoparticles, was used for the preparation of well-defined Fe-Ni and Fe- Co nanoalloys, avoiding exploitation of any organic solvent. This approach allows a large scale production of nanoparticles specifically stabilized by an iron oxyhydroxide shell without a need of secondary functionalization. Transmission electron microscopy, X-ray powder diffraction, X-ray fluorescence, magnetization, and M?ssbauer data demonstrate a core- shell nature of the as-synthesized nanoparticles. The nanoparticle core is of metallic origin and is inhomogeneous at the atomic level, consisting of iron-rich and iron-poor alloy phases. The composition of the shell is close to the ferrihydrite and its role lies in prevention of oxidation-induced degradation of nanoparticle properties. The core is ferromagnetic at and below room temperature, experiencing superparamagnetic relaxation effects due to a reduced size of nanoparticles, whereas the shell is completely superparamagnetic at 300 K and magnetically orders below?25 K. Both developed types of magnetic nanoalloys exhibit a strong magnetic response under applied magnetic fields with a high magnetization values achievable at relatively low applied magnetic fields. Beside this, the highly biocompatible chemical composition of the nanoparticle shell and ability of its chemical modification by substitution or addition of other ions or molecules further empower the application potential of these MNPs, especially in the field of biomedicine. © Springer Science+Business Media B.V. 2012.
Περιγραφή
Λέξεις-κλειδιά
Borohydride, Core-shell, Ferrihydrite, Magnetic nanoparticles, Magnetization measurements, Mossbauer spectroscopy, Borohydrides, Ferrihydrites, Chemical modification, Iron, Iron alloys, Iron oxides, Magnetic fields, Magnetization, Molybdenum, Nanomagnetics, Nanoparticles, Organic solvents, Shells (structures), Superparamagnetism, Transmission electron microscopy, X ray powder diffraction, Synthesis (chemical), alloy, cobalt, ferric hydroxide, iron oxide, magnetic nanoparticle, nickel, sodium derivative, article, chemical composition, chemical structure, degradation, magnetic field, oxidation, particle size, priority journal, reduction, room temperature, substitution reaction, synthesis, X ray fluorescence
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
http://www.scopus.com/inward/record.url?eid=2-s2.0-84867026587&partnerID=40&md5=08f2b30f928721c45cadc0613222aaeb
Γλώσσα
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών