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A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Nanospecies".

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 10195

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Special Issue Editors

Dr. Marian Grigoras

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Guest Editor

National Institute of Research and Development for Technical Physics, Mangeron Av 47, 6600 Iaşi, Romania
Interests: magnetic materials; magnetic properties; permanent magnets; nanocomposite materials; physics of surfaces and interfaces; magnetic thin films
Special Issues, Collections and Topics in MDPI journals

Dr. Mihaela Lostun

E-Mail Website
Guest Editor

National Institute of Research and Development for Technical Physics, Mangeron Av 47, 6600 Iaşi, Romania
Interests: nanostructured materials; advanced materials; nanoparticle synthesis; surface characterization; magnetic materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Magnetic microspheres offer great potential in a variety of applications, both in their bare form and when covered with a surface layer and functional groups chosen for specific uses.

Because of the widespread applications of magnetic microspheres in biotechnology, biomedicine, material science, engineering and environmental areas, a great deal of attention has been paid to the synthesis of different kinds of magnetic microspheres. Each potential application of the magnetic microspheres requires that they possess different properties. Given that the magnetic properties of powders are controlled by microstructure, shape, size or processing conditions, progress in this area will increase our ability to control and design the properties of the materials of the future.

The aim of this Special Issue is to gather contributions that address current progress in the field of magnetic microspheres through synthesis, doping, modelling, advanced characterization and beyond.

It is our pleasure to invite you to submit a manuscript for this Special Issue.

Sincerely,

Dr. Marian Grigoras
Dr. Mihaela Lostun
Guest Editors

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. Magnetochemistry is an international peer-reviewed open access monthly 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 2700 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

magnetic materials
dispersed microspheres
controlled particle size
surface functionalizing
chemical homogeneity
co-precipitation
magnetic control
magnetic adsorbents

Published Papers (5 papers)

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Research

10 pages, 4551 KiB

Open AccessFeature PaperArticle

Effect of Cr³⁺ Doping on Magnetic Properties of Zn-Mg Ferrite Nanoparticles

by Xiaogang Yu, Renpeng Yang, Chengwei Wu, Bo Liu and Wei Zhang

Magnetochemistry 2023, 9(7), 181; https://doi.org/10.3390/magnetochemistry9070181 - 11 Jul 2023

Cited by 1 | Viewed by 1151

Abstract

Zn_0.6Mg_0.4Cr_xFe_2−xO₄ (0 ≤ x ≤ 0.4) nanoparticles were synthesized using a hydrothermal technique. The obtained magnetic nanoparticles (MNPs) exhibited a spinel structure, where the lattice constant decreased with the Cr³⁺ ion content. The doping of Cr³⁺ ion (x = 0.1) increased the specific saturation magnetization to 46.4 emu/g but decreased to 20.0 emu/g with the further increase in the Cr³⁺ ion content to x = 0.4. The decrement in Curie temperature was ascribed to the weakened super-exchange interaction between the metal ions located at A-sites and B-sites, which arose from the doping of the Cr³⁺ ion. The T₂-weighted images gradually darkened with the increase in Zn_0.6Mg_0.4Cr_0.1Fe_1.9O₄ nanoparticles concentration, suggesting that the nanoparticles can enhance the image contrast. Zn_0.6Mg_0.4Cr_xFe_2−xO₄ (0 ≤ x ≤ 0.4) nanoparticles were able to heat the agar phantom to the hyperthermia temperature under the safe alternating magnetic field, which showed their potential in the magnetic induction hyperthermia. Full article

(This article belongs to the Special Issue Advances in Magnetic Microspheres)

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10 pages, 366 KiB

Open AccessArticle

Magnetization, Band Gap and Specific Heat of Pure and Ion Doped MnFe₂O₄ Nanoparticles

by I. N. Apostolova, A. T. Apostolov and J. M. Wesselinowa

Magnetochemistry 2023, 9(3), 76; https://doi.org/10.3390/magnetochemistry9030076 - 4 Mar 2023

Cited by 2 | Viewed by 1275

Abstract

We have studied the magnetic properties of ion doped MnFe

_{2}

_{4}

nanoparticles with the help of a modified Heisenberg model and Green’s function theory taking into account all correlation functions. The magnetization

M_{s}

and the Curie temperature

T_{C}

increase [...] Read more.

We have studied the magnetic properties of ion doped MnFe

_{2}

_{4}

nanoparticles with the help of a modified Heisenberg model and Green’s function theory taking into account all correlation functions. The magnetization

M_{s}

and the Curie temperature

T_{C}

increase with decreasing particle size. This is the opposite behavior than that observed in CoFe

_{2}

_{4}

and CoCr

_{2}

_{4}

nanoparticles. By Co, Mg or Ni doping,

M_{s}

and

T_{C}

increase with enhancing the dopant concentration, whereas, by La or Gd doping, the opposite effect is obtained due to the different doping and host ionic radii which change the exchange interaction constants. The band gap energy

E_{g}

is calculated from the s–d model. It can decrease or increase by different ion doping. The peak observed in the temperature dependence of the specific heat at

T_{C}

is field dependent. Full article

(This article belongs to the Special Issue Advances in Magnetic Microspheres)

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12 pages, 2834 KiB

Open AccessFeature PaperArticle

Effect of the Preparation Conditions on the Magnetic Coercivity of CoPt Alloy Nanowires

by Mihai Tibu, Nicoleta Lupu and Oana-Georgiana Dragos-Pinzaru

Magnetochemistry 2022, 8(12), 176; https://doi.org/10.3390/magnetochemistry8120176 - 1 Dec 2022

Cited by 1 | Viewed by 1546

Abstract

In this paper, 3 µm length and 200 nm diameter CoPt nanowire arrays (NWs) with different Co contents were prepared by electrodeposition at a controlled potential from an aqueous hexachloroplatinate solution. The synthesis occurred at two different solution pH values (2.5 and 5.5) in an electrochemical bath free of additives, as well as with saccharin as an organic additive. A complete morphological, compositional, structural and magnetic characterization of the as-prepared nanowires has been carried out. The results show that, by controlling the electrodeposition conditions, the Co content of the alloy can be tuned from 16% to 92%. The crystalline structure of the as-deposited compounds can also be controlled, with the obtained data showing that the face-centered cubic (fcc) crystalline structure changes into a hexagonal close-packed (hcp) structure when saccharin is used as an organic additive during the electrodeposition. The changes in the alloy’s composition and crystalline structure strongly influence the magnetic properties of the NW’s arrays. Full article

(This article belongs to the Special Issue Advances in Magnetic Microspheres)

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17 pages, 4224 KiB

Open AccessArticle

Studies on the Removal of Congo Red Dye by an Adsorbent Based on Fly-Ash@Fe₃O₄ Mixture

by Maria Harja, Nicoleta Lupu, Horia Chiriac, Dumitru-Daniel Herea and Gabriela Buema

Magnetochemistry 2022, 8(10), 125; https://doi.org/10.3390/magnetochemistry8100125 - 14 Oct 2022

Cited by 16 | Viewed by 2655

Abstract

The effectiveness of a Fe₃O₄-loaded fly ash composite for the adsorption of Congo red dye was assessed in this work. The structure and properties of the magnetic adsorbent were established by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometer (XRD), vibrating sample magnetometer (VSM), and dynamic light scattering (DLS). The magnetic results showed a saturation magnetization value of 6.51 emu/g and superparamagnetic behavior. The main parameters that influence the removal of Congo red dye adsorbent such as dose, initial concentration, and contact time were examined. The Freundlich adsorption isotherm and pseudo-second-order kinetic model provided the best fit for the experimental findings. The Congo red dye’s maximum adsorption capacity of 154 mg/g was reported in the concentration range of 10–100 mg/L, using the proposed magnetic adsorbent. The results of the recyclability investigation demonstrated that the circular economy idea is valid. The adsorbent that was synthesized was also further characterized by XRD and FTIR techniques after Congo red dye adsorption. Full article

(This article belongs to the Special Issue Advances in Magnetic Microspheres)

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7 pages, 1244 KiB

Open AccessArticle

Microstructure and Magnetic Properties of Ce₁₄Fe₇₈Co₂B₆ Nanopowders Prepared by Ball Milling at Low Temperature

by Marian Grigoras, Mihaela Lostun, Firuta Borza, Marieta Porcescu, George Stoian and Nicoleta Lupu

Magnetochemistry 2021, 7(12), 160; https://doi.org/10.3390/magnetochemistry7120160 - 10 Dec 2021

Viewed by 2480

Abstract

Ce₁₄Fe₇₈Co₂B₆ nanopowders with hard-magnetic properties have been successfully prepared by ball milling at low temperatures in liquid nitrogen. The morphology, structure, and magnetic properties of Ce₁₄Fe₇₈Co₂B₆ powders have been investigated using scanning electron microscopy, X-ray diffraction, and vibrating sample magnetometry, respectively. It was found that powder ball milling at low temperature in liquid nitrogen, has the advantage that the oxidation of powders is inhibited and the particles rapidly reach nanometric dimensions. In comparison to the Ce₁₄Fe₇₈Co₂B₆ powders prepared by ball milling at room temperature, the powders milled at low temperature present a more uniform particle size and no rare-earth oxides, which leads thus to remarkable magnetic properties. The nanocrystalline Ce₁₄Fe₇₈Co₂B₆ powders with optimum characteristics, prepared at low temperature, have the size of 153 nm or less, present a coercivity of 5.1 kOe, and a saturation magnetization of 113 emu/g after milling for 6 h at low temperature. Low temperature milling may become a promising technique for the fabrication of high performance powders used for permanent magnets preparation. Full article

(This article belongs to the Special Issue Advances in Magnetic Microspheres)

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