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. 2022 Dec 6;14(12):2730. doi: 10.3390/pharmaceutics14122730

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Synthesis and characterization of MNPs. (a) Schematic illustration of the preparation process of MNPs. (b,c) Transmission electron microscopy (TEM) images of Fe₃O₄ and MNPs, respectively. (d) N₂ adsorption–desorption isotherms and mesopore size distribution (the inset) of MNPs. (e) Scanning electron microscope (SEM) image and particle diameter distribution (the inset) of MNPs. (f) The X-ray diffraction (XRD) patterns and (g) the Fourier transform infrared spectra (FTIR) images of Fe₃O₄ and MNPs. (h) Saturation magnetization curve of MNPs at room temperature. (i) T₂-weighted magnetic resonance imaging (MRI) images of different samples. Samples 1 to 5 represent water, silica of 75 and 150 μg/mL, and MNPs of 75 and 150 μg/mL, respectively.