Magnetic properties of SiO2-coated iron oxide nanoparticles studied by polarized small angle neutron scattering

Lee, Sung Ho; Lee, Dong Heon; Jung, Hyunseung; Han, Young‐Soo; Kim, Tae‐Hwan; Yang, Woochul

doi:10.1016/j.cap.2015.04.003

Cited by 8 publications

(4 citation statements)

References 29 publications

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“…Enhancement of the magnetic properties of iron oxide nanoparticles was achieved by the introduction of a silica shell, resulting in a significant increase of η m and in a decrease of the lower magnetized surface region as compared to the noncoated particles (Lee et al, 2015). Similarly, magnetic nanocrystals embedded in silicate glasses were found to consist of a magnetic core with equal magnetic and nuclear size, surrounded by a nonmagnetic shell (Raghuwanshi et al, 2014(Raghuwanshi et al, , 2015.…”

Section: B Intraparticle Magnetizationmentioning

confidence: 99%

Magnetic small-angle neutron scattering

et al. 2019

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Small-angle neutron scattering (SANS) is one of the most important techniques for microstructure determination, being utilized in a wide range of scientific disciplines, such as materials science, physics, chemistry, and biology. The reason for its great significance is that conventional SANS is probably the only method capable of probing structural inhomogeneities in the bulk of materials on a mesoscopic real-space length scale, from roughly 1 − 300 nm. Moreover, the exploitation of the spin degree of freedom of the neutron provides SANS with a unique sensitivity to study magnetism and magnetic materials at the nanoscale. As such, magnetic SANS ideally complements more real-space and surface-sensitive magnetic imaging techniques, e.g., Lorentz transmission electron microscopy, electron holography, magnetic force microscopy, Kerr microscopy, or spinpolarized scanning tunneling microscopy. In this review article we summarize the recent applications of the SANS method to study magnetism and magnetic materials. This includes a wide range of materials classes, from nanomagnetic systems such as soft magnetic Fe-based nanocomposites, hard magnetic Nd−Fe−B-based permanent magnets, magnetic steels, ferrofluids, nanoparticles, and magnetic oxides, to more fundamental open issues in contemporary condensed matter physics such as skyrmion crystals, noncollinar magnetic structures in noncentrosymmetric compounds, magnetic/electronic phase separation, and vortex lattices in type-II superconductors. Special attention is paid not only to the vast variety of magnetic materials and problems where SANS has provided direct insight, but also to the enormous progress made regarding the micromagnetic simulation of magnetic neutron scattering.

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Section: B Intraparticle Magnetizationmentioning

confidence: 99%

Magnetic small-angle neutron scattering

et al. 2019

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“…For in vivo purposes, nanoparticles are required to be biocompatible, waterdispersible, stable in biological media, and uniform in size to maintain the suitable magnetic properties (Chang et al, 2007;Lee et al, 2015). Surface coatings are known generally to influence advantageously nanoparticle features.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Toxicological assessment of silica-coated iron oxide nanoparticles in human astrocytes

Fernández-Bertólez

Costa

Brandão

et al. 2018

Food and Chemical Toxicology

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Iron oxide nanoparticles (ION) have great potential for an increasing number of medical and biological applications, particularly those focused on nervous system. Although ION seem to be biocompatible and present low toxicity, it is imperative to unveil the potential risk for the nervous system associated to their exposure, especially because current data on ION effects on human nervous cells are scarce. Thus, in the present study potential toxicity associated with silica-coated ION (S-ION) exposure was evaluated on human A172 glioblastoma cells. To this aim, a complete toxicological screening testing several exposure times (3 and 24 h), nanoparticle concentrations (5-100 μg/ml), and culture media (complete and serum-free) was performed to firstly assess S-ION effects at different levels, including cytotoxicity - lactate dehydrogenase assay, analysis of cell cycle and cell death production - and genotoxicity - H2AX phosphorylation assessment, comet assay, micronucleus test and DNA repair competence assay. Results obtained showed that S-ION exhibit certain cytotoxicity, especially in serum-free medium, related to cell cycle disruption and cell death induction. However, scarce genotoxic effects and no alteration of the DNA repair process were observed. Results obtained in this work contribute to increase the knowledge on the impact of ION on the human nervous system cells.

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“…For instance, a coating of iron oxide MNPs with a silica shell enhances the magnetic properties of the surface regions. 157 POLARIS also allows observing deviations from single domain behavior to complex spin structures with the presence of ordered misaligned moments from the magnetic eld axis. The technique measures the neutron spin-state aer scattering at the samples allowing to separate magnetic from nuclear scattering using a polarized 3 He gas cell as analyzing neutron lter.…”

Section: Magnetic Structure Of Particlesmentioning

confidence: 99%

“…For instance, a coating of iron oxide MNPs with a silica shell enhances the magnetic properties of the surface regions. 157 …”

Section: Conventional Small-angle X-ray and Neutron Scatteringmentioning

confidence: 99%