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Topical Collection "Magnetic Nanostructured Materials: Synthesis, Characterization and Their Cutting-Edge Applications"

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A topical collection in Nanomaterials (ISSN 2079-4991). This collection belongs to the section "Synthesis, Interfaces and Nanostructures".

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Editors

Dr. Vasileios Tzitzios

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Collection Editor

Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research, “Demokritos”, 15310 Athens, Greece
Interests: magnetic colloidal particles; liquid phase synthesis; L1₀ chemical ordering; FePt; CoPt; Fe₃O₄; nanomagnetism; biomedical applications of magnetic nanoparticles; catalysis
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Dr. Georgia Basina

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Collection Editor

Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research, “Demokritos”, 15310 Athens, Greece
Interests: Nanoparticles synthesis; Fe3O4; γ-Fe2O3; Biomedical; environmental and catalytic applications of magnetic nanomaterials

Topical Collection Information

In the early 1930s, Frenkel and Dorfman predicted that a particle of ferromagnetic material with a size below a critical limit would possess a single magnetic domain within which magnetic moments of free electrons are aligned in parallel. Since then, there has been a continuously increasing interest in the scientific community for the development and study of magnetic materials in the nanoscale size regime. This enormous interest is mainly due to their prospective applications in many technological areas, including magnetic storage devices, ferrofluids, magnetic resonance imaging, magnetic carriers, magnetic hyperthermia environmental remedation protection, energy and catalysis. Recently, there has additionally been a great interest for the synthesis of 2D magnetic materials, which seem to offer potential for significant improvements in spintronic applications.

The present collection is aimed at presenting the current state-of-the-art in the synthesis of magnetic nanomaterials in both particles and thin-layered forms, as well as their advanced characterization and niche applications. In this collection, we are inviting contributions from leading groups in the field aiming to present a comprehensive view of the progress in this discipline.

Dr. Vasileios Tzitzios
Dr. Georgia Basina
Collection Editors

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Keywords

magnetic nanomaterials
colloidal particles
thin films
synthesis
nanomagnetism
2D magnetism
magnetic characterization
composite magnets
L10 ordering
nanomagnets applications

Published Papers (3 papers)

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2023

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Open AccessArticle

Self-Heating Flower-like Nanoconstructs with Limited Incorporation of Yttrium in Maghemite: Effect of Chemical Composition on Heating Efficiency, Cytotoxicity and Genotoxicity

Miloš Ognjanović

Željko Jaćimović

Milica Kosović-Perutović

and

Nanomaterials 2023, 13(5), 870; https://doi.org/10.3390/nano13050870 - 26 Feb 2023

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Abstract

Partial cation substitution can significantly change the physical properties of parent compounds. By controlling the chemical composition and knowing the mutual relationship between composition and physical properties, it is possible to tailor the properties of materials to those that are superior for desired technological application. Using the polyol synthesis procedure, a series of yttrium-substituted iron oxide nanoconstructs, γ-Fe_2−xY_xO₃ (YIONs), was prepared. It was found that Y³⁺ could substitute Fe³⁺ in the crystal structures of maghemite (γ-Fe₂O₃) up to a limited concentration of ~1.5% (γ-Fe_1.969Y_0.031O₃). Analysis of TEM micrographs showed that crystallites or particles were aggregated in flower-like structures with diameters from 53.7 ± 6.2 nm to 97.3 ± 37.0 nm, depending on yttrium concentration. To be investigated for potential applications as magnetic hyperthermia agents, YIONs were tested twice: their heating efficiency was tested and their toxicity was investigated. The Specific Absorption Rate (SAR) values were in the range of 32.6 W/g to 513 W/g and significantly decreased with increased yttrium concentration in the samples. Intrinsic loss power (ILP) for γ-Fe₂O₃ and γ-Fe_1.995Y_0.005O₃ were ~8–9 nH·m²/Kg, which pointed to their excellent heating efficiency. IC₅₀ values of investigated samples against cancer (HeLa) and normal (MRC-5) cells decreased with increased yttrium concentration and were higher than ~300 μg/mL. The samples of γ-Fe_2−xY_xO₃ did not show a genotoxic effect. The results of toxicity studies show that YIONs are suitable for further in vitro/in vivo studies toward to their potential medical applications, while results of heat generation point to their potential use in magnetic hyperthermia cancer treatment or use as self-heating systems for other technological applications such as catalysis. Full article

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Open AccessArticle

Exploring the Magnetic and Electrocatalytic Properties of Amorphous MnB Nanoflakes

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Maria Veronica Sofianos

Nanomaterials 2023, 13(2), 300; https://doi.org/10.3390/nano13020300 - 11 Jan 2023

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Abstract

Two-dimensional (2D) metal borides are a class of ceramic materials with diverse structural and topological properties. These diverse material properties of metal borides are what forms the basis of their interdisciplinarity and their applicability in various research fields. In this study, we highlight which fundamental and practical parameters need to be taken into consideration when designing nanomaterials for specific applications. A simple one-pot chemical reduction method was applied for the synthesis of manganese mono-boride nanoflakes at room temperature. How the specific surface area and boron-content of the as-synthesized manganese mono-boride nanoflakes influence their magnetic and electrocatalytic properties is reported. The sample with the highest specific surface area and boron content demonstrated the best magnetic and electrocatalytic properties in the HER. Whereas the sample with the lowest specific surface area and boron content exhibited the best electric conductivity and electrocatalytic properties in the OER. Full article

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2022

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Open AccessArticle

Sublayer-Enhanced Growth of Highly Ordered Mn₅Ge₃ Thin Film on Si(111)

and

Nanomaterials 2022, 12(24), 4365; https://doi.org/10.3390/nano12244365 - 07 Dec 2022

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Abstract

Mn₅Ge₃ epitaxial thin films previously grown mainly on Ge substrate have been synthesized on Si(111) using the co-deposition of Mn and Ge at a temperature of 390 °C. RMS roughness decreases by almost a factor of two in the transition from a completely polycrystalline to a highly ordered growth mode. This mode has been stabilized by changing the ratio of the Mn and Ge evaporation rate from the stoichiometric in the buffer layer. Highly ordered Mn₅Ge₃ film has two azimuthal crystallite orientations, namely Mn₅Ge₃ (001) [1-10] and Mn₅Ge₃ (001) [010] matching Si(111)[-110]. Lattice parameters derived a (7.112(1) Å) and c (5.027(1) Å) are close to the bulk values. Considering all structural data, we proposed a double buffer layer model suggesting that all layers have identical crystal structure with P6₃/mcm symmetry similar to Mn₅Ge₃, but orientation and level of Si concentration are different, which eliminates 8% lattice mismatch between Si and Mn₅Ge₃ film. Mn₅Ge₃ film on Si(111) demonstrates no difference in magnetic properties compared to other reported films. T_C is about 300 K, which implies no significant excess of Mn or Si doping. It means that the buffer layer not only serves as a platform for the growth of the relaxed Mn₅Ge₃ film, but is also a good diffusion barrier. Full article

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Topical Collection "Magnetic Nanostructured Materials: Synthesis, Characterization and Their Cutting-Edge Applications"

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Published Papers (3 papers)

2023

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2022

Jump to: 2023

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