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Article

Surface Compositional Change of Iron Oxide Porous Nanorods: A Route for Tuning their Magnetic Properties

NABLA Lab, Biological and Environmental Sciences and Engineering (BESE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955–6900, Saudi Arabia
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Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Nadine Millot
Molecules 2020, 25(5), 1234; https://doi.org/10.3390/molecules25051234
Received: 14 February 2020 / Revised: 1 March 2020 / Accepted: 5 March 2020 / Published: 9 March 2020
(This article belongs to the Special Issue Advances in Metal Oxide Nanoparticles)
The capability of synthesizing specific nanoparticles (NPs) by varying their shape, size and composition in a controlled fashion represents a typical set of engineering tools that tune the NPs magnetic response via their anisotropy. In particular, variations in NP composition mainly affect the magnetocrystalline anisotropy component, while the different magnetic responses of NPs with isotropic (i.e., spherical) or elongated shapes are mainly caused by changes in their shape anisotropy. In this context, we propose a novel route to obtain monodispersed, partially hollow magnetite nanorods (NRs) by colloidal synthesis, in order to exploit their shape anisotropy to increase the related coercivity; we then modify their composition via a cation exchange (CE) approach. The combination of a synthetic and post-synthetic approach on NRs gave rise to dramatic variations in their magnetic features, with the pores causing an initial magnetic hardening that was further enhanced by the post-synthetic introduction of a manganese oxide shell. Indeed, the coupling of the core and shell ferrimagnetic phases led to even harder magnetic NRs. View Full-Text
Keywords: nanorods; cation exchange; magnetic nanoparticles; core/shell; nanopores nanorods; cation exchange; magnetic nanoparticles; core/shell; nanopores
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MDPI and ACS Style

Casu, A.; Loche, D.; Lentijo-Mozo, S.; Falqui, A. Surface Compositional Change of Iron Oxide Porous Nanorods: A Route for Tuning their Magnetic Properties. Molecules 2020, 25, 1234. https://doi.org/10.3390/molecules25051234

AMA Style

Casu A, Loche D, Lentijo-Mozo S, Falqui A. Surface Compositional Change of Iron Oxide Porous Nanorods: A Route for Tuning their Magnetic Properties. Molecules. 2020; 25(5):1234. https://doi.org/10.3390/molecules25051234

Chicago/Turabian Style

Casu, Alberto, Danilo Loche, Sergio Lentijo-Mozo, and Andrea Falqui. 2020. "Surface Compositional Change of Iron Oxide Porous Nanorods: A Route for Tuning their Magnetic Properties" Molecules 25, no. 5: 1234. https://doi.org/10.3390/molecules25051234

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