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Nanomaterials
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Core-Shell Magnetic Nanoparticles
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Core-Shell Magnetic Nanoparticles

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Inorganic Materials and Metal-Organic Frameworks".

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 12582

Special Issue Editor

Dr. Alberto López-Ortega

E-Mail Website
Guest Editor
Science Department, and Institute for Advanced Materials and Mathematics (INAMAT2), Universidad Pública de Navarra, Pamplona, Spain
Interests: magnetic nanoparticles; core-shell structures; colloidal synthesis; physical growth methods; permanent magnets; magneto-plasmonics; exchange-coupled materials; functional nanostructures

Special Issue Information

Dear Colleagues,

The development of novel magnetic core-shell nanoparticles has become increasingly appealing in recent years. This research in parallel with the improvement of the synthesis and fabrication methodologies has paved the way to obtain unprecedented multifunctional core-shell nanoparticles with unique properties. These types of multiphase nanostructures can combine the different functionalities of the diverse constituents bringing about novel and enhanced properties which are resulting in innovative applications of magnetic nanoparticles.

A particularly interesting topic in core-shell magnetic nanoparticles is the study of systems where both the core and the shell exhibit magnetic properties (ferromagnetic, ferrimagnetic or antiferromagnetic). In these systems the exchange interaction between both constituents brings about an extra degree of freedom to tailor the overall properties of the system. Besides, the marked reduced character of the nanoparticles and their strong morphological size-dependent properties are also critical parameters that must be considered to finely tune their properties. Therefore, the full exploitation of such effects relies on the ability to independently vary every single parameter involved in the core-shell nanoparticle as well as the capability of fine control of the interface shared by the coupled materials.

This Special Issue will be focused on recent trends in the preparation, characterization and potential applications of core-shell nanoparticles composed by magnetic materials. I invite researches from all relevant disciplines to contribute to this Special Issue of Nanomaterials.

Dr. Alberto López-Ortega
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • multifunctional nanostructures
  • magnetic nanoparticles
  • core-shell structures
  • colloidal synthesis
  • physical growth methods
  • magnetic exchange-coupling
  • spring magnets
  • exchange bias
  • surface and interface effects

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Published Papers (5 papers)

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Editorial

Jump to: Research, Review

1 pages, 190 KiB  
Editorial
Core–Shell Magnetic Nanoparticles
by Alberto López-Ortega
Nanomaterials 2023, 13(5), 822; https://doi.org/10.3390/nano13050822 - 23 Feb 2023
Cited by 1 | Viewed by 984
Abstract
The development of novel magnetic core–shell nanoparticles has become increasingly appealing in recent years [...] Full article
(This article belongs to the Special Issue Core-Shell Magnetic Nanoparticles)

Research

Jump to: Editorial, Review

14 pages, 4503 KiB  
Article
Study of Corrosion Mechanisms in Corrosive Media and Their Influence on the Absorption Capacity of Fe2O3/NdFeO3 Nanocomposites
by Kayrat K. Kadyrzhanov, Artem L. Kozlovskiy, Kamila Egizbek, Inesh E. Kenzhina, Rauan Sh. Abdinov and Maxim V. Zdorovets
Nanomaterials 2022, 12(13), 2302; https://doi.org/10.3390/nano12132302 - 4 Jul 2022
Cited by 2 | Viewed by 1571
Abstract
This paper presents the results of a study of the change in the stability of Fe2O3/NdFeO3 nanocomposites when exposed to aggressive media over a long period of time. The main purpose of these studies is to investigate the [...] Read more.
This paper presents the results of a study of the change in the stability of Fe2O3/NdFeO3 nanocomposites when exposed to aggressive media over a long period of time. The main purpose of these studies is to investigate the mechanisms of degradation and corrosion processes occurring in Fe2O3/NdFeO3 nanocomposites, as well as the influence of the phase composition on the properties and degradation resistance. According to the X-ray phase analysis, it was found that the variation of the initial components leads to the formation of mixed composition nanocomposites with different Fe2O3/NdFeO3 phase ratios. During corrosion tests, it was found that the dominance of the NdFeO3 phase in the composition of nanocomposites leads to a decrease in the degradation and amorphization rate of nanostructures by a factor of 1.5–2 compared to structures in which the Fe2O3 phase dominates. Such a difference in the degradation processes indicates the high stability of two-phase composites. Moreover, in the case of an aqueous medium, nanocomposites dominated by the NdFeO3 phase are practically not subjected to corrosion and deterioration of properties. The results obtained helped to determine the resistance of Fe2O3/NdFeO3 nanocomposites to degradation processes caused by exposure to aggressive media, as well as to determine the mechanisms of property changes in the process of degradation. The results of the study of the absorption capacity of Fe2O3/NdFeO3 nanocomposites in the case of the purification of aqueous media from manganese and arsenic showed that a change in the phase ratio in nanocomposites leads to an increase in the absorption efficiency of pollutants from aqueous media. Full article
(This article belongs to the Special Issue Core-Shell Magnetic Nanoparticles)
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28 pages, 8086 KiB  
Article
Biocompatible Magnetic Colloidal Suspension Used as a Tool for Localized Hyperthermia in Human Breast Adenocarcinoma Cells: Physicochemical Analysis and Complex In Vitro Biological Profile
by Elena-Alina Moacă, Claudia-Geanina Watz, Vlad Socoliuc, Roxana Racoviceanu, Cornelia Păcurariu, Robert Ianoş, Simona Cîntă-Pînzaru, Lucian Barbu Tudoran, Fran Nekvapil, Stela Iurciuc, Codruța Șoica and Cristina-Adriana Dehelean
Nanomaterials 2021, 11(5), 1189; https://doi.org/10.3390/nano11051189 - 30 Apr 2021
Cited by 12 | Viewed by 2687
Abstract
Magnetic iron oxide nanoparticles are the most desired nanomaterials for biomedical applications due to their unique physiochemical properties. A facile single-step process for the preparation of a highly stable and biocompatible magnetic colloidal suspension based on citric-acid-coated magnetic iron oxide nanoparticles used as [...] Read more.
Magnetic iron oxide nanoparticles are the most desired nanomaterials for biomedical applications due to their unique physiochemical properties. A facile single-step process for the preparation of a highly stable and biocompatible magnetic colloidal suspension based on citric-acid-coated magnetic iron oxide nanoparticles used as an effective heating source for the hyperthermia treatment of cancer cells is presented. The physicochemical analysis revealed that the magnetic colloidal suspension had a z-average diameter of 72.7 nm at 25 °C with a polydispersity index of 0.179 and a zeta potential of −45.0 mV, superparamagnetic features, and a heating capacity that was quantified by an intrinsic loss power analysis. Raman spectroscopy showed the presence of magnetite and confirmed the presence of citric acid on the surfaces of the magnetic iron oxide nanoparticles. The biological results showed that breast adenocarcinoma cells (MDA-MB-231) were significantly affected after exposure to the magnetic colloidal suspension with a concentration of 30 µg/mL 24 h post-treatment under hyperthermic conditions, while the nontumorigenic (MCF-10A) cells exhibited a viability above 90% under the same thermal setup. Thus, the biological data obtained in the present study clearly endorse the need for further investigations to establish the clinical biological potential of synthesized magnetic colloidal suspension for magnetically triggered hyperthermia. Full article
(This article belongs to the Special Issue Core-Shell Magnetic Nanoparticles)
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12 pages, 4694 KiB  
Article
Anisotropic Growth and Magnetic Properties of α″-Fe16N2@C Nanocones
by Yong Li, Qifeng Kuang, Xiaoling Men, Shenggang Wang, Da Li, Chuljin Choi and Zhidong Zhang
Nanomaterials 2021, 11(4), 890; https://doi.org/10.3390/nano11040890 - 31 Mar 2021
Cited by 7 | Viewed by 2690
Abstract
α″-Fe16N2 nanomaterials with a shape anisotropy for high coercivity performance are of interest in potential applications such as rare-earth-free permanent magnets, which are difficult to synthesize in situ anisotropic growth. Here, we develop a new and facile one-pot microemulsion method [...] Read more.
α″-Fe16N2 nanomaterials with a shape anisotropy for high coercivity performance are of interest in potential applications such as rare-earth-free permanent magnets, which are difficult to synthesize in situ anisotropic growth. Here, we develop a new and facile one-pot microemulsion method with Fe(CO)5 as the iron source and tetraethylenepentamine (TEPA) as the N/C source at low synthesis temperatures to fabricate carbon-coated tetragonal α″-Fe16N2 nanocones. Magnetocrystalline anisotropy energy is suggested as the driving force for the anisotropic growth of α″-Fe16N2@C nanocones because the easy magnetization direction of tetragonal α″-Fe16N2 nanocrystals is along the c axis. The α″-Fe16N2@C nanocones agglomerate to form a fan-like microstructure, in which the thin ends of nanocones direct to its center, due to the magnetostatic energy. The lengths of α″-Fe16N2@C nanocones are ~200 nm and the diameters vary from ~10 nm on one end to ~40 nm on the other end. Carbon shells with a thickness of 2–3 nm protect α″-Fe16N2 nanocones from oxidation in air atmosphere. The α″-Fe16N2@C nanocones synthesized at 433 K show a room-temperature saturation magnetization of 82.6 emu/g and a coercive force of 320 Oe. Full article
(This article belongs to the Special Issue Core-Shell Magnetic Nanoparticles)
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Review

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36 pages, 9788 KiB  
Review
Gas Phase Synthesis of Multi-Element Nanoparticles
by Raúl López-Martín, Benito Santos Burgos, Peter S. Normile, José A. De Toro and Chris Binns
Nanomaterials 2021, 11(11), 2803; https://doi.org/10.3390/nano11112803 - 22 Oct 2021
Cited by 13 | Viewed by 3555
Abstract
The advantages of gas-phase synthesis of nanoparticles in terms of size control and flexibility in choice of materials is well known. There is increasing interest in synthesizing multi-element nanoparticles in order to optimize their performance in specific applications, and here, the flexibility of [...] Read more.
The advantages of gas-phase synthesis of nanoparticles in terms of size control and flexibility in choice of materials is well known. There is increasing interest in synthesizing multi-element nanoparticles in order to optimize their performance in specific applications, and here, the flexibility of material choice is a key advantage. Mixtures of almost any solid materials can be manufactured and in the case of core–shell particles, there is independent control over core size and shell thickness. This review presents different methods of producing multi-element nanoparticles, including the use of multiple targets, alloy targets and in-line deposition methods to coat pre-formed cores. It also discusses the factors that produce alloy, core–shell or Janus morphologies and what is possible or not to synthesize. Some applications of multi-element nanoparticles in medicine will be described. Full article
(This article belongs to the Special Issue Core-Shell Magnetic Nanoparticles)
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