The Effect of Organic Coatings in the Magnetization of CoFe2O4 Nanoparticles

Published

August 4, 2022

Author(s)

Priscyla L. Andrade, Valdeene Silva, Kathryn L. Krycka, Juscelino Leao, I-Lin Liu, Maria P. Silva, J. Albino Aguiar

Abstract

Cobalt ferrite has attracted considerable attention in recent years due to the unique physical properties such as high Curie temperature, large magnetocrystalline anisotropy, high coercivity, moderate saturation magnetization, large magnetostrictive coefficient, excellent chemical stability and mechanical hardness. This current work focuses on the magnetic response characteristics of polysaccharide fucan coated cobalt-ferrite nanoparticles for their application as a solid support for enzymes immobilization and other biotechnology applications. Here we unambiguously show that surfactant coating of nanoparticles can significantly affect their magnetic response throughout the nanoparticle volume. While it has been recently suggested that oleic acid may preserve nanoscale magnetism in ferrites, we present evidence that the influence of oleic acid on the magnetic response of CoFe2O4 nanoparticles is more than a surface effect, instead pervading throughout the interior of the nanoparticle.

Citation

AIP Advances

Volume

12

Issue

8

Pub Type

Journals

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DOI Link

Keywords

Cobalt Ferrite, Magnetic Nanoparticles, X-ray diffraction (XRD), Small Angle Neutron Spectroscopy (SANS), Electron Scanning Microscopy (SEM), Transmission Electron Microscopy (TEM), Neutron Scattering, Polysaccharides.

Citation

Andrade, P. , Silva, V. , Krycka, K. , Leao, J. , Liu, I. , Silva, M. and Albino Aguiar, J. (2022), The Effect of Organic Coatings in the Magnetization of CoFe₂O₄ Nanoparticles, AIP Advances, [online], https://dx.doi.org/10.1063/5.0078167 (Accessed October 24, 2025)