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Molecules
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Magnetic Nanomaterials: Modern Trends and Prospects
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Magnetic Nanomaterials: Modern Trends and Prospects

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 3274

Special Issue Editor

Prof. Dr. Sheng Yun Wu

E-Mail Website
Guest Editor
Department of Physics, National Dong Hwa University (NDHU), Hualien 97401, Taiwan
Interests: magnetism; neutron scattering; nano science; AIoTs; quantum computing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Magnetite nanomaterials have recently been considered attractive materials for advanced technological applications such as biology and medicine, as well as meta-oxide/diluted magnetic semiconductors. The field of magnetite nanomaterials has recently seen rapid development because of these materials’ special magnetic properties. Based on these properties, a series of synthetic routes have been explored with different levels of control of size, shape, and polydispersity. Despite these remarkable prospects, many problems remain to be solved.

This Special Issue aims to cover the main properties, applications, and synthesis methods of magnetite nanomaterials. We invite you to contribute to this Issue with your latest relevant research.

This Special Issue is open to original research articles and review papers that will help researchers worldwide to understand the latest trends and progress in magnetite nanomaterials research.

Prof. Dr. Sheng Yun Wu
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. Molecules 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 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 nanomaterials
  • magnetic semiconductors
  • magneto-optics
  • biology
  • biologic sensors
  • MRI mapping
  • Raman scattering
  • photoluminescence

Published Papers (2 papers)

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Research

17 pages, 8429 KiB  
Article
Mössbauer and Structure-Magnetic Properties Analysis of AyB1−yCxFe2−xO4 (C=Ho,Gd,Al) Ferrite Nanoparticles Optimized by Doping
by Qing Lin, Fang Yang, Qian Zhang, Kaimin Su, Huiren Xu, Yun He and Jinpei Lin
Molecules 2023, 28(10), 4226; https://doi.org/10.3390/molecules28104226 - 22 May 2023
Cited by 2 | Viewed by 993
Abstract
AyB1−yCxFe2−xO4 (C=Ho,Gd,Al) ferrite powders have been synthesized by the sol-gel combustion route. The X-ray diffraction of the CoHoxFe2−xO4 (x = 0~0.08) results indicated [...] Read more.
AyB1−yCxFe2−xO4 (C=Ho,Gd,Al) ferrite powders have been synthesized by the sol-gel combustion route. The X-ray diffraction of the CoHoxFe2−xO4 (x = 0~0.08) results indicated the compositions of single-phase cubic ferrites. The saturation magnetisation of CoHoxFe2−xO4 decreased by the Ho3+ ions, and the coercivity increased initially and then decreased with the increase of the calcination temperature. The Mössbauer spectra indicated that CoHoxFe2−xO4 displays a ferrimagnetic behaviour with two normal split Zeeman sextets. The magnetic hyperfine field tends to decrease by Ho3+ substitution owing to the decrease of the A–B super-exchange by the paramagnetic rare earth Ho3+ ions. The value of the quadrupole shift was very small in the CoHoxFe2−xO4 specimens, indicating that the symmetry of the electric field around the nucleus is good in the cobalt ferrites. The absorption area of the Mössbauer spectra changed with increasing Ho3+ substitution, indicating that the substitution influences the fraction of iron ions at tetrahedral A and octahedral B sites. The X-ray diffraction of Mg0.5Zn0.5CxFe2−xO4(C=Gd,Al) results confirmed the compositions of single-phase cubic ferrites. The variation of the average crystalline size and lattice constant are related to the doping of gadolinium ions and aluminum ions. With increasing gadolinium ions and aluminum ions, the coercivity increased and the saturation magnetization underwent a significant change. The saturation magnetization of AlMg0.5Zn0.5FeO4 ferrite reached a minimum value (MS= 1.94 mu/g). The sample exhibited ferrimagnetic and paramagnetic character with the replacement with Gd3+ ions, that sample exhibited paramagnetic character with the replacement with Al3+ ions, and the isomer shift values indicated that iron is in the form of Fe3+ ions. Full article
(This article belongs to the Special Issue Magnetic Nanomaterials: Modern Trends and Prospects)
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18 pages, 6123 KiB  
Article
Structure and Magnetic Properties of AO and LiFePO4/C Composites by Sol-Gel Combustion Method
by Kaimin Su, Fang Yang, Qian Zhang, Huiren Xu, Yun He and Qing Lin
Molecules 2023, 28(4), 1970; https://doi.org/10.3390/molecules28041970 - 19 Feb 2023
Cited by 2 | Viewed by 1905
Abstract
LiFePO4 takes advantage of structure stability, safety and environmental friendliness, and has been favored by the majority of scientific researchers. In order to further improve the properties of LiFePO4, AO-type metal oxides (MgO and ZnO) and LiFePO4/C composites [...] Read more.
LiFePO4 takes advantage of structure stability, safety and environmental friendliness, and has been favored by the majority of scientific researchers. In order to further improve the properties of LiFePO4, AO-type metal oxides (MgO and ZnO) and LiFePO4/C composites were successfully prepared by a two-step sol-gel method. The effects of AO-type metal oxides (MgO and ZnO) on LiFePO4/C composites were studied. TG, XRD, FTIR, SEM and VSM analysis showed that the final product of the MgO and LiFePO4/C composite was about 70.5% of the total mass of the precursor; the complete main diffraction peak of LiFePO4 and MgO can be found without obvious impurity at the diffraction peak; there is good micro granularity and dispersion; the particle size is mainly 300 nm; the saturation magnetization (Ms), the residual magnetization (Mr) and the area of hysteresis loop are increased with the increase in MgO content; and the maximum Ms is 11.11 emu/g. The final product of ZnO and LiFePO4/C composites is about 69% of the total mass of precursors; the complete main diffraction peak of LiFePO4 and ZnO can be found without obvious impurity at the diffraction peak; there is good micro granularity and dispersion; the particle size is mainly 400 nm; and the coercivity (Hc) first slightly increases and then gradually decreases with the increase of zinc oxide. Full article
(This article belongs to the Special Issue Magnetic Nanomaterials: Modern Trends and Prospects)
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