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Almutairi TS. Unraveling the Complex Interplay of Phase Transitions in Spinel Ferrites: A Comprehensive Quantum Mechanical Vibrational Study of ZnFe 2O 4. ACS OMEGA 2023; 8:36999-37010. [PMID: 37841198 PMCID: PMC10568704 DOI: 10.1021/acsomega.3c04268] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 09/13/2023] [Indexed: 10/17/2023]
Abstract
The rich phase transition landscape of spinel ferrites and its profound impact on their physical properties have garnered significant interest in recent years. The complex interplay of divalent and trivalent cations distributed across A- and B-sites gives rise to a captivating variety of interactions. In this study, we delve into the structural, electronic, magnetic, and vibrational properties of ZnFe2O4 as a function of the degree of inversion, employing first-principles density functional theory with global and range-separated hybrid functionals and a local basis set. The ground state of ZnFe2O4 is an open-shell system, characterized by Zn atoms occupying tetrahedral sites, Fe atoms residing in octahedral sites, and Fe atom spins exhibiting ligand parallel alignment. In the normal structure, the antiparallel arrangement is less stable than the ferro arrangement by 0.058 eV (673 K) for fully relaxed structures, decreasing to 0.034 eV (395 K) upon incorporating a zero-point vibrations contribution. For normal ferromagnetic ZnFe2O4, we calculated scattering for A1g, Eg, and 3T2g symmetry at 676.6, 367.1, and (189.7, 457.7, 602.3) cm-1, respectively. Additionally, four T1u vibrational frequencies predicted by group theory were obtained at 524.59, 358.48, 312.49, and 192.9 cm-1, demonstrating excellent agreement with the experimental studies. We also explored the influence of spin rearrangement and inversion (X = 0.5 and 1) on Raman and infrared spectra. By analyzing the infrared spectra of isotopic substitutions, we reevaluated the assignments of the four T1u modes in light of available experimental data. Notably, the sensitivity of peak positions and intensities for some Raman modes, particularly A1g and T2g(2), to spin arrangement could provide a convenient experimental tool for detecting phase transitions induced by changes in temperature or external electric fields. This investigation shines a light on the complex interplay of phase transitions in spinel ferrites, paving the way for a deeper understanding of their properties and potential applications.
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Affiliation(s)
- Tahani Saad Almutairi
- Section of Physical Chemistry
Department of Chemistry, Taibah University, Madinah 42353, Saudi Arabia
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2
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Soudani I, Ben Brahim K, Oueslati A, Aydi A, Khirouni K, Benali A, Dhahri E, Valente MA. Research on the physical properties of LiMn 0.5Fe 2O 4 spinel ferrites by the combination of optical, magnetic, and dielectric behaviors. RSC Adv 2023; 13:9260-9272. [PMID: 36950711 PMCID: PMC10026823 DOI: 10.1039/d3ra00985h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 03/08/2023] [Indexed: 03/22/2023] Open
Abstract
Ferrite compounds have recently attracted significant interest because of their multifunctional properties. This work investigates the optical, magnetic, and dielectric properties of a LiMn0.5Fe2O4 ferrite prepared by a solid-state reaction. Raman spectroscopy analysis substantiated the presence of the 5 active modes representing the vibration of the oxygen anion at both tetrahedral and octahedral sites. The direct optical band gap was estimated to be 3.51 eV, which indicates the semiconductor behavior of the compound. A theoretical modulation of the hysteresis loop was done to confirm the dominance of the ferromagnetic contribution over the antiferromagnetic one. Furthermore, the dielectric permittivity result indicated a colossal value of the order of 103. The dielectric losses are characterized by the Giuntini law to extract the relaxation process, which is hidden by the DC-conductivity process. Our results indicate the potential of LiMn0.5Fe2O4 for applications in multifunctional devices.
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Affiliation(s)
- Ibtihel Soudani
- Laboratory of Multifunctional Materials and Applications (LaMMA), LR16ES18, Faculty of Sciences of Sfax, University of Sfax BP 1171 3000 Sfax Tunisia
| | - Khawla Ben Brahim
- Laboratory for Spectroscopic and Optical Characterization of Materials (LaSCOM), Faculty of Sciences, University of Sfax B. P. 1171 3000 Sfax Tunisia
| | - Abderrazek Oueslati
- Laboratory for Spectroscopic and Optical Characterization of Materials (LaSCOM), Faculty of Sciences, University of Sfax B. P. 1171 3000 Sfax Tunisia
| | - Abdelhedi Aydi
- Laboratory of Multifunctional Materials and Applications (LaMMA), LR16ES18, Faculty of Sciences of Sfax, University of Sfax BP 1171 3000 Sfax Tunisia
| | - Kamel Khirouni
- Laboratory of Physics of Materials and Nanomaterials Applied to the Environment (LaPHYMNE), Faculty of Sciences, University of Gabès Cited Erriadh 6079 Gabès Tunisia
| | - A Benali
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B.P. 1171 3000 Sfax Tunisia
- Physics Department, I3N, University of Aveiro, Campus de Santiago Aveiro Portugal
| | - E Dhahri
- Laboratoire de Physique Appliquée, Faculté des Sciences, Université de Sfax B.P. 1171 3000 Sfax Tunisia
| | - M A Valente
- Physics Department, I3N, University of Aveiro, Campus de Santiago Aveiro Portugal
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Lemine OM, Algessair S, Madkhali N, Al-Najar B, El-Boubbou K. Assessing the Heat Generation and Self-Heating Mechanism of Superparamagnetic Fe 3O 4 Nanoparticles for Magnetic Hyperthermia Application: The Effects of Concentration, Frequency, and Magnetic Field. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:453. [PMID: 36770414 PMCID: PMC9920274 DOI: 10.3390/nano13030453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 01/16/2023] [Accepted: 01/20/2023] [Indexed: 06/18/2023]
Abstract
Magnetite nanoparticles (MNPs) exhibit favorable heating responses under magnetic excitation, which makes them particularly suited for various hyperthermia applications. Herein, we report the detailed self-heating mechanisms of MNPs prepared via the Ko-precipitation Hydrolytic Basic (KHB) methodology. The as-prepared MNPs were fully characterized using various spectroscopic techniques including transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), and vibrating sample magnetometry (VSM). MNPs exhibited stable 15 nm quasi-spherical small-sized particles, pure crystalline cubic Fe3O4 phases, high saturation magnetizations (Ms = ~40 emu·g-1), and superparamagnetic behavior. In response to alternating magnetic fields (AMFs), these MNPs displayed excellent self-heating efficiencies with distinctive heating responses, even when minimal doses of MNPs were used. Heating efficacies and specific absorption rate (SAR) values as functions of concentration, frequency, and amplitude were systematically investigated. Remarkably, within only a few minutes, MNPs (2.5 mg/mL) showed a rapid dissipation of heat energy, giving a maximum intrinsic loss power (ILP) of 4.29 nHm2/kg and a SAR of 261 W/g. Hyperthermia temperatures were rapidly reached in as early as 3 min and could rise up to 80 °C. In addition, Rietveld refinement, Langevin, and linear response theory (LRT) models were studied to further assess the magnetic and heating mechanisms. The LRT model was used to determine the Néel relaxation time (τR = 5.41 × 10-7 s), which was compared to the Brownian relation time value (τB = 11 × 10-7 s), showing that both mechanisms are responsible for heat dissipated by the MNPs. Finally, the cytotoxicity assay was conducted on aqueous dispersions of MNPs, indicating their biocompatibility and low toxicity. Our results strongly suggest that the as-prepared Fe3O4 MNPs are promising vehicles for potential magnetically triggered biomedical hyperthermia applications.
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Affiliation(s)
- O. M. Lemine
- Department of Physics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMISU), Riyadh 11623, Saudi Arabia
| | - Saja Algessair
- Department of Physics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMISU), Riyadh 11623, Saudi Arabia
| | - Nawal Madkhali
- Department of Physics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMISU), Riyadh 11623, Saudi Arabia
| | - Basma Al-Najar
- Department of Physics, College of Science, University of Bahrain, Sakhir 32038, Bahrain
| | - Kheireddine El-Boubbou
- Department of Chemistry, College of Science, University of Bahrain, Sakhir 32038, Bahrain
- King Abdullah International Medical Research Center (KAIMRC), King Abdulaziz Medical City, National Guard Health Affairs, Riyadh 11426, Saudi Arabia
- Nanomaterials for Bioimaging Group (nanoBIG), Departamento de Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
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Díaz-Ufano C, Gallo-Cordova A, Santiandreu L, Veintemillas-Verdaguer S, Sáez R, Fernández MJT, del Puerto Morales M. Maximizing the Adsorption Capacity of Iron Oxide Nanocatalysts for the Degradation of Organic Dyes. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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5
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Mourdikoudis S, Menelaou M, Fiuza-Maneiro N, Zheng G, Wei S, Pérez-Juste J, Polavarapu L, Sofer Z. Oleic acid/oleylamine ligand pair: a versatile combination in the synthesis of colloidal nanoparticles. NANOSCALE HORIZONS 2022; 7:941-1015. [PMID: 35770698 DOI: 10.1039/d2nh00111j] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A variety of colloidal chemical approaches has been developed in the last few decades for the controlled synthesis of nanostructured materials in either water or organic solvents. Besides the precursors, the solvents, reducing agents, and the choice of surfactants are crucial for tuning the composition, morphology and other properties of the resulting nanoparticles. The ligands employed include thiols, amines, carboxylic acids, phosphines and phosphine oxides. Generally, adding a single ligand to the reaction mixture is not always adequate to yield the desired features. In this review, we discuss in detail the role of the oleic acid/oleylamine ligand pair in the chemical synthesis of nanoparticles. The combined use of these ligands belonging to two different categories of molecules aims to control the size and shape of nanoparticles and prevent their aggregation, not only during their synthesis but also after their dispersion in a carrier solvent. We show how the different binding strengths of these two molecules and their distinct binding modes on specific facets affect the reaction kinetics toward the production of nanostructures with tailored characteristics. Additional functions, such as the reducing function, are also noted, especially for oleylamine. Sometimes, the carboxylic acid will react with the alkylamine to form an acid-base complex, which may serve as a binary capping agent and reductant; however, its reducing capacity may range from lower to much lower than that of oleylamine. The types of nanoparticles synthesized in the simultaneous presence of oleic acid and oleylamine and discussed herein include metal oxides, metal chalcogenides, metals, bimetallic structures, perovskites, upconversion particles and rare earth-based materials. Diverse morphologies, ranging from spherical nanoparticles to anisotropic, core-shell and hetero-structured configurations are presented. Finally, the relation between tuning the resulting surface and volume nanoparticle properties and the relevant applications is highlighted.
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Affiliation(s)
- Stefanos Mourdikoudis
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 16628 - Prague 6, Czech Republic.
| | - Melita Menelaou
- Department of Chemical Engineering, Faculty of Geotechnical Sciences and Environmental Management, Cyprus University of Technology, 3036 Limassol, Cyprus.
| | - Nadesh Fiuza-Maneiro
- CINBIO, Universidade de Vigo, Materials Chemistry and Physics, Department of Physical Chemistry, Campus Universitario Lagoas Marcosende, 36310 Vigo, Spain.
| | - Guangchao Zheng
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450001, China
| | - Shuangying Wei
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 16628 - Prague 6, Czech Republic.
| | - Jorge Pérez-Juste
- CINBIO, Universidade de Vigo, Departamento de Química Física, Campus Universitario As Lagoas, Marcosende, 36310 Vigo, Spain
- Galicia Sur Health Research Institute (IIS Galicia Sur), 36310 Vigo, Spain
| | - Lakshminarayana Polavarapu
- CINBIO, Universidade de Vigo, Materials Chemistry and Physics, Department of Physical Chemistry, Campus Universitario Lagoas Marcosende, 36310 Vigo, Spain.
| | - Zdeněk Sofer
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 16628 - Prague 6, Czech Republic.
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6
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Blanco-Gutiérrez V, Li P, Berzal-Cabetas R, Dos santos-García A. Exploring the photocatalytic activity of nanometric magnetite for PET materials degradation under UV light. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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7
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Magnetism of Nanoparticles: Effect of the Organic Coating. NANOMATERIALS 2021; 11:nano11071787. [PMID: 34361173 PMCID: PMC8308320 DOI: 10.3390/nano11071787] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 06/30/2021] [Accepted: 07/01/2021] [Indexed: 12/23/2022]
Abstract
The design of novel multifunctional materials based on nanoparticles requires tuning of their magnetic properties, which are strongly dependent on the surface structure. The organic coating represents a unique tool to significantly modify the surface structure trough the bonds between the ligands of the organic molecule and the surface metal atoms. This work presents a critical overview of the effects of the organic coating on the magnetic properties of nanoparticles trough a selection of papers focused on different approaches to control the surface structure and the morphology of nanoparticles’ assemblies.
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8
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Amri N, Massoudi J, Nouri K, Triki M, Dhahri E, Bessais L. Influence of neodymium substitution on structural, magnetic and spectroscopic properties of Ni-Zn-Al nano-ferrites. RSC Adv 2021; 11:13256-13268. [PMID: 35423872 PMCID: PMC8697615 DOI: 10.1039/d0ra10140k] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 03/08/2021] [Indexed: 11/21/2022] Open
Abstract
Ni0.6Zn0.4Al0.5Fe1.5-x Nd x O4 ferrite samples, with x = 0.00, 0.05, 0.075 and 0.1, were synthesized using the sol-gel method. The effects of Nd3+ doping on the structural, magnetic and spectroscopic properties were investigated. XRD Rietveld refinement carried out using the FULLPROF program shows that the Ni-Zn ferrite retains its pure single phase cubic structure with Fd3̄m space group. An increase in lattice constant and porosity happens with increasing Nd3+ concentration. FTIR spectra present the two prominent absorption bands in the range of 400 to 600 cm-1 which are the fingerprint region of all ferrites. The change in Raman modes in the synthesized ferrite system were observed with Nd3+ substitution. The magnetization curves show a typical transition, at the Curie temperature T C, from a low temperature ferrimagnetic state to a high temperature paramagnetic state. The saturation magnetization, coercivity and remanence magnetization are found to be decreasing with increasing the Nd3+ concentration.
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Affiliation(s)
- N Amri
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B.P. 1171 3000 Sfax Tunisia
| | - J Massoudi
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B.P. 1171 3000 Sfax Tunisia
| | - K Nouri
- ICMPE (UMR 7182), CNRS, UPEC, Université Paris Est 94320 Thiais France
| | - M Triki
- Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax B. P 1171 3000 Sfax Tunisia
| | - E Dhahri
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B.P. 1171 3000 Sfax Tunisia
| | - L Bessais
- ICMPE (UMR 7182), CNRS, UPEC, Université Paris Est 94320 Thiais France
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9
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Ahmed S, Ahmad Z. Development of hexagonal nanoscale nickel ferrite for the removal of organic pollutant via Photo-Fenton type catalytic oxidation process. ACTA ACUST UNITED AC 2020. [DOI: 10.1016/j.enmm.2020.100321] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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10
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Bouokkeze D, Massoudi J, Hzez W, Smari M, Bougoffa A, Khirouni K, Dhahri E, Bessais L. Investigation of the structural, optical, elastic and electrical properties of spinel LiZn 2Fe 3O 8 nanoparticles annealed at two distinct temperatures. RSC Adv 2019; 9:40940-40955. [PMID: 35540037 PMCID: PMC9076384 DOI: 10.1039/c9ra07569k] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 11/07/2019] [Indexed: 11/21/2022] Open
Abstract
Nanoparticles of Li0.5ZnFe1.5O4 (LiZn2Fe3O8) with the spinel structure were prepared by a sol-gel auto-combustion method at two different annealing temperatures. X-ray diffractograms and Rietveld refinement confirmed the formation of the spinel structure. The morphology was analyzed by electron microscopy, which showed that the grains were composed of different crystallites. Elastic properties were determined from infrared spectroscopy. It was found that the elastic parameters increased with the increase in annealing temperatures. The band gap depends on the annealing temperature and it decreased on increasing the particle size. The conductivity of the specimen annealed at 500 °C followed either the Jonscher's model or Drude's model depending on the temperature range. This conductivity decreased when the annealing temperature was raised by 600 °C. AC conductivity was found to be controlled by the hopping model. A single relaxation phenomenon was evidenced for each sample from impedance analysis. The Nyquist diagram proved that the samples were simultaneously capacitive and resistive and also supported the presence of multiple relaxation times.
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Affiliation(s)
- D Bouokkeze
- Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l'Environnement, Faculté des Sciences de Gabès cité Erriadh, Université de Gabès 6079 Gabès Tunisia
| | - J Massoudi
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B.P. 1171 Sfax 3000 Tunisia
| | - W Hzez
- Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l'Environnement, Faculté des Sciences de Gabès cité Erriadh, Université de Gabès 6079 Gabès Tunisia
| | - M Smari
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B.P. 1171 Sfax 3000 Tunisia
| | - A Bougoffa
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B.P. 1171 Sfax 3000 Tunisia
| | - K Khirouni
- Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l'Environnement, Faculté des Sciences de Gabès cité Erriadh, Université de Gabès 6079 Gabès Tunisia
| | - E Dhahri
- Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax B.P. 1171 Sfax 3000 Tunisia
| | - L Bessais
- ICMPE (UMR 7182), CNRS, UPEC, Université Paris Est 94320 Thiais France
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11
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Rios NS, Morais EG, dos Santos Galvão W, Andrade Neto DM, dos Santos JCS, Bohn F, Correa MA, Fechine PBA, Fernandez-Lafuente R, Gonçalves LRB. Further stabilization of lipase from Pseudomonas fluorescens immobilized on octyl coated nanoparticles via chemical modification with bifunctional agents. Int J Biol Macromol 2019; 141:313-324. [DOI: 10.1016/j.ijbiomac.2019.09.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 08/26/2019] [Accepted: 09/02/2019] [Indexed: 12/27/2022]
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12
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Jalili H, Aslibeiki B, Ghotbi Varzaneh A, Chernenko VA. The effect of magneto-crystalline anisotropy on the properties of hard and soft magnetic ferrite nanoparticles. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:1348-1359. [PMID: 31355103 PMCID: PMC6632225 DOI: 10.3762/bjnano.10.133] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 06/18/2019] [Indexed: 06/10/2023]
Abstract
Recent advances in the field of magnetic materials emphasize that the development of new and useful magnetic nanoparticles (NPs) requires an accurate and fundamental understanding of their collective magnetic behavior. Studies show that the magnetic properties are strongly affected by the magnetic anisotropy of NPs and by interparticle interactions that are the result of the collective magnetic behavior of NPs. Here we study these effects in more detail. For this purpose, we prepared Co x Fe3- x O4 NPs, with x = 0-1 in steps of 0.2, from soft magnetic (Fe3O4) to hard magnetic (CoFe2O4) ferrite, with a significant variation of the magnetic anisotropy. The phase purity and the formation of crystalline NPs with a spinel structure were confirmed through Rietveld refinement. The effect of Co doping on structure, morphology and magnetic properties of Co x Fe3- x O4 samples was investigated. In particular, we examined the interparticle interactions in the samples by δm graphs and Henkel plots that have not been reported before in literature. Finally, we studied the hyperthermia properties and observed that the heat efficiency of soft Fe3O4 is about 4 times larger than that of hard CoFe2O4 ferrite, which was attributed to the high coercive field of samples compared with the external field amplitude.
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Affiliation(s)
- Hajar Jalili
- Department of Physics, University of Tabriz, Tabriz 51666-16471, Iran
| | - Bagher Aslibeiki
- Department of Physics, University of Tabriz, Tabriz 51666-16471, Iran
| | - Ali Ghotbi Varzaneh
- Department of Physics, Isfahan University of Technology, Isfahan, 84156-83111, Iran
- BCMaterials and University of Basque Country (UPV/EHU), Sarriena s/n, Leioa 48940, Spain
| | - Volodymyr A Chernenko
- BCMaterials and University of Basque Country (UPV/EHU), Sarriena s/n, Leioa 48940, Spain
- Ikerbasque, Basque Foundation for Science, 48013, Bilbao, Spain
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13
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Mesoporous Silica Matrix as a Tool for Minimizing Dipolar Interactions in NiFe₂O₄ and ZnFe₂O₄ Nanoparticles. NANOMATERIALS 2017. [PMID: 28640197 PMCID: PMC5535217 DOI: 10.3390/nano7070151] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
NiFe2O4 and ZnFe2O4 nanoparticles have been prepared encased in the MCM (Mobile Composition of Matter) type matrix. Their magnetic behavior has been studied and compared with that corresponding to particles of the same composition and of a similar size (prepared and embedded in amorphous silica or as bare particles). This study has allowed elucidation of the role exerted by the matrix and interparticle interactions in the magnetic behavior of each ferrite system. Thus, very different superparamagnetic behavior has been found in ferrite particles of similar size depending on the surrounding media. Also, the obtained results clearly provide evidence of the vastly different magnetic behavior for each ferrite system.
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