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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Surface Charge and Coating of CoFe2O4 Nanoparticles: Evidence of Preserved Magnetic and Electronic Properties
Journal of Physical Chemistry C, Volume 119, No. 45, Year 2015
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Description
Magnetic nanoparticles (MNPs) have shown exceptional potential for several biological and clinical applications. However, MNPs must be coated by a biocompatible shell for such applications. The aim of this study is to understand if and how the surface charge and coating can affect the electronic and magnetic properties of CoFe2O4 MNPs. The role of the surface on the total magnetic moment of MNPs is a controversial issue, and several effects can contribute to make it deviate from the bulk value, including the charge, the nature of the coating, and also the synthetic technique. Positively and negatively charged uncoated CoFe2O4 NPs as well as citrate-coated NPs were prepared by soft chemistry synthesis. The electronic properties and cationic distribution of CoFe2O4 NPs were probed by X-ray absorption spectroscopy (XAS), X-ray magnetic circular dichroism (XMCD), and X-ray photoemission spectroscopy (XPS) techniques and confirmed by theoretical simulations. The overall magnetic behavior and the hyperthermic properties were evaluated by magnetometry and calorimetric measurements, respectively. The results show that all of the investigated CoFe2O4 NPs have high magnetic anisotropy energy, and the surface charge and coating do not influence appreciably their electronic and magnetic properties. In addition, the citrate shell improves the stability of the NPs in aqueous environment, making CoFe2O4 NPs suitable for biomedical applications. © 2015 American Chemical Society.
Authors & Co-Authors
Nappini, Silvia
Italy, Rome
Consiglio Nazionale Delle Ricerche
Magnano, Elena
Italy, Rome
Consiglio Nazionale Delle Ricerche
Bondino, Federica
Italy, Rome
Consiglio Nazionale Delle Ricerche
Pis, Igor
Italy, Rome
Consiglio Nazionale Delle Ricerche
Italy, Basovizza
Elettra-sincrotrone Trieste S.c.p.a.
Barla, Alessandro
Italy, Montelibretti
Istituto Di Struttura Della Materia, Montellibreti
Pineider, Francesco
Unknown Affiliation
Sangregorio, Claudio
Italy, Florence
Istituto Di Chimica Dei Composti Organometallici, Sesto Fiorentino
Vaccari, Lisa
Italy, Basovizza
Elettra-sincrotrone Trieste S.c.p.a.
Venturelli, Leonardo
Italy, Rome
Consiglio Nazionale Delle Ricerche
Baglioni, Piero
Unknown Affiliation
Statistics
Citations: 84
Authors: 10
Affiliations: 4
Identifiers
Doi:
10.1021/acs.jpcc.5b04910
ISSN:
19327447