1
|
Maltoni P, Barucca G, Rutkowski B, Spadaro MC, Jönsson PE, Varvaro G, Yaacoub N, De Toro JA, Peddis D, Mathieu R. Unraveling Exchange Coupling in Ferrites Nano-Heterostructures. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2304152. [PMID: 37888807 DOI: 10.1002/smll.202304152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 10/10/2023] [Indexed: 10/28/2023]
Abstract
The magnetic coupling of a set of SrFe12 O19 /CoFe2 O4 nanocomposites is investigated. Advanced electron microscopy evidences the structural coherence and texture at the interfaces of the nanostructures. The fraction of the lower anisotropy phase (CoFe2 O4 ) is tuned to assess the limits that define magnetically exchange-coupled interfaces by performing magnetic remanence, first-order reversal curves (FORCs), and relaxation measurements. By combining these magnetometry techniques and the structural and morphological information from X-ray diffraction, electron microscopy, and Mössbauer spectrometry, the exchange intergranular interaction is evidenced, and the critical thickness within which coupled interfaces have a uniform reversal unraveled.
Collapse
Affiliation(s)
- Pierfrancesco Maltoni
- Department of Materials Science and Engineering, Uppsala University, Box 35, Uppsala, 751 03, Sweden
| | - Gianni Barucca
- Dipartimento di Scienze e Ingegneria della Materia dell'Ambiente ed Urbanistica-SIMAU, Università Politecnica delle Marche, Ancona, 60131, Italy
| | - Bogdan Rutkowski
- Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. A. Mickiewicza 30, Kraków, 30-059, Poland
| | - Maria Chiara Spadaro
- Dipartimento di Scienze e Ingegneria della Materia dell'Ambiente ed Urbanistica-SIMAU, Università Politecnica delle Marche, Ancona, 60131, Italy
| | - Petra E Jönsson
- Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala, SE-751 20, Sweden
| | - Gaspare Varvaro
- Istituto di Struttura della Materia, nM2-lab, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome, 00015, Italy
| | - Nader Yaacoub
- Institut des Molécules et Matériaux du Mans, CNRS UMR-6283, Le Mans Université, Le Mans, F-72085, France
| | - José A De Toro
- Instituto Regional de Investigación Científica Aplicada (IRICA) and Departamento de Física Aplicada, Universidad de Castilla-La Mancha, Ciudad Real, 13071, Spain
| | - Davide Peddis
- Istituto di Struttura della Materia, nM2-lab, Consiglio Nazionale delle Ricerche, Monterotondo Scalo, Rome, 00015, Italy
- Dipartimento di Chimica e Chimica Industriale & INSTM, nM2-Lab, Università degli Studi di Genova, Via Dodecaneso 31, Genova, 1-16146, Italy
| | - Roland Mathieu
- Department of Materials Science and Engineering, Uppsala University, Box 35, Uppsala, 751 03, Sweden
| |
Collapse
|
2
|
Maltoni P, Baričić M, Barucca G, Spadaro MC, Arbiol J, Yaacoub N, Peddis D, Mathieu R. Tunable particle-agglomeration and magnetic coupling in bi-magnetic nanocomposites. Phys Chem Chem Phys 2023; 25:27817-27828. [PMID: 37814895 DOI: 10.1039/d3cp03689h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/11/2023]
Abstract
A set of non-stoichiometric Zn-Co-ferrite nanoparticles (NPs) was prepared by thermal decomposition of metallic complexes, in the presence of oleic acid, and, after a ligand-exchange process, was coated by a hydrophilic surfactant: these NPs were used as seeds in a sol-gel self-combustion synthesis to prepare nanocomposites (NCs) with a fixed weight ratio. Our focus here is the development of an efficient synthetic approach to control the magnetic coupling between a hard-magnetic matrix (Sr-ferrite) and NPs. The physico-chemical synthetic conditions (temperature, pH, colloidal stability) were optimized in order to tune their effect on the final particles' agglomeration in the matrix. We demonstrate that our synthetic approach is a novel way to produce strongly magnetically coupled NCs, where the final extrinsic properties could be tuned by controlling (i) the agglomeration of seeds in the matrix and (ii) their elemental doping.
Collapse
Affiliation(s)
- Pierfrancesco Maltoni
- Department of Materials Science and Engineering, Uppsala University, Box 35, Uppsala, 751 03, Sweden.
| | - Miran Baričić
- Dipartimento di Chimica e Chimica Industriale & INSTM, nM2-Lab, Università degli Studi di, Genova, Via Dodecaneso 31, Genova, 1-16146, Italy.
| | - Gianni Barucca
- Dipartimento di Scienze e Ingegneria della Materia dell'Ambiente ed Urbanistica - SIMAU, Università Politecnica delle Marche, Ancona 60131, Italy
- Consiglio Nazionale delle Ricerche, Istituto di Strttura della Materia, nM2-lab, Monterotondo Scalo (RM), 00015, Italy
| | - Maria Chiara Spadaro
- Dipartimento di Scienze e Ingegneria della Materia dell'Ambiente ed Urbanistica - SIMAU, Università Politecnica delle Marche, Ancona 60131, Italy
| | - Jordi Arbiol
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193, Barcelona, Catalonia, Spain
- ICREA, Pg. Lluís Companys 23, 08020, Barcelona, Catalonia, Spain
| | - Nader Yaacoub
- Le Mans Université, Institut des Molécules et Matériaux du Mans, CNRS UMR-6283, Avenue Olivier Messiaen, Le Mans, 72085, France
| | - Davide Peddis
- Dipartimento di Chimica e Chimica Industriale & INSTM, nM2-Lab, Università degli Studi di, Genova, Via Dodecaneso 31, Genova, 1-16146, Italy.
- Consiglio Nazionale delle Ricerche, Istituto di Strttura della Materia, nM2-lab, Monterotondo Scalo (RM), 00015, Italy
| | - Roland Mathieu
- Department of Materials Science and Engineering, Uppsala University, Box 35, Uppsala, 751 03, Sweden.
| |
Collapse
|
3
|
Magnetic Nanoclusters Increase the Sensitivity of Lateral Flow Immunoassays for Protein Detection: Application to Pneumolysin as a Biomarker for Streptococcus pneumoniae. NANOMATERIALS 2022; 12:nano12122044. [PMID: 35745381 PMCID: PMC9228753 DOI: 10.3390/nano12122044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/07/2022] [Accepted: 06/08/2022] [Indexed: 11/16/2022]
Abstract
Lateral flow immunoassays for detecting biomarkers in body fluids are simple, quick, inexpensive point-of-care tests widely used in disease surveillance, such as during the coronavirus disease 2019 (COVID-19) pandemic. Improvements in sensitivity would increase their utility in healthcare, food safety, and environmental control. Recently, biofunctional magnetic nanoclusters have been used to selectively label target proteins, which allows their detection and quantification with a magneto-inductive sensor. This type of detector is easily integrated with the lateral flow immunoassay format. Pneumolysin is a cholesterol-dependent cytolysin and one of the most important protein virulence factors of pneumonia produced by Streptococcus pneumoniae. It is recognized as an important biomarker for diagnosis in urine samples. Pneumonia is the infectious disease that causes the most deaths globally, especially among children under five years and adults over 65 years, most of them in low- and middle-income countries. There especially, a rapid diagnostic urine test for pneumococcal pneumonia with high sensitivity and specificity would be helpful in primary care. In this work, a lateral flow immunoassay with magnetic nanoclusters conjugated to anti-pneumolysin antibodies was combined with two strategies to increase the technique's performance. First, magnetic concentration of the protein before the immunoassay was followed by quantification by means of a mobile telephone camera, and the inductive sensor resulted in detection limits as low as 0.57 ng (telephone camera) and 0.24 ng (inductive sensor) of pneumolysin per milliliter. Second, magnetic relocation of the particles within the test strip after the immunoassay was completed increased the detected signal by 20%. Such results obtained with portable devices are promising when compared to non-portable conventional pneumolysin detection techniques such as enzyme-linked immunosorbent assays. The combination and optimization of these approaches would have excellent application in point-of-care biodetection to reduce antibiotic misuse, hospitalizations, and deaths from community-acquired pneumonia.
Collapse
|
4
|
Maltoni P, Ivanov SA, Barucca G, Varvaro G, Peddis D, Mathieu R. Complex correlations between microstructure and magnetic behavior in SrFe 12O 19 hexaferrite nanoparticles. Sci Rep 2021; 11:23307. [PMID: 34857873 PMCID: PMC8639738 DOI: 10.1038/s41598-021-02782-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Accepted: 11/22/2021] [Indexed: 12/03/2022] Open
Abstract
The magnetic properties of SrFe12O19 (SFO) hard hexaferrites are governed by the complex relation to its microstructure, determining their relevance for permanent magnets´ applications. A set of SFO nanoparticles obtained by sol–gel self-combustion synthesis was selected for an in-depth structural X-Rays powder diffraction (XRPD) characterization by means of G(L) line-profile analysis. The obtained crystallites´ size distribution reveal a clear dependence of the size along the [001] direction on the synthesis approach, resulting in the formation of platelet-like crystallites. In addition, the size of the SFO nanoparticles was determined by transmission electron microscopy (TEM) analysis and the average number of crystallites within a particle was estimated. These results have been evaluated to illustrate the formation of single-domain state below a critical value, and the activation volume was derived from time dependent magnetization measurements, aiming to clarify the reversal magnetization process of hard magnetic materials.
Collapse
Affiliation(s)
- Pierfrancesco Maltoni
- Department of Materials Science and Engineering, Uppsala University, Box 35, 751 03, Uppsala, Sweden.
| | - Sergey A Ivanov
- Department of Materials Science and Engineering, Uppsala University, Box 35, 751 03, Uppsala, Sweden.,Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow, Russia, 119991
| | - Gianni Barucca
- Department SIMAU, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131, Ancona, Italy
| | - Gaspare Varvaro
- Istituto di Struttura della Materia-CNR, nM2-Lab, 00015, Monterotondo Scalo, RM, Italy
| | - Davide Peddis
- Istituto di Struttura della Materia-CNR, nM2-Lab, 00015, Monterotondo Scalo, RM, Italy.,Department of Chemistry and Industrial Chemistry, nM2-Lab, Università degli Studi di Genova, Via Dodecaneso 31, 1-16146, Genova, Italy
| | - Roland Mathieu
- Department of Materials Science and Engineering, Uppsala University, Box 35, 751 03, Uppsala, Sweden.
| |
Collapse
|
5
|
Lari TT, Mirzaei AA, Atashi H, Bozorgzadeh HR. A Modeling Study of Operating Conditions and Different Supports on Fe-Co-Ce Nanocatalyst and Optimizing of Light Olefins Selectivity in the Fischer-Tropsch Synthesis. CHEMISTRY & CHEMICAL TECHNOLOGY 2021. [DOI: 10.23939/chcht15.02.170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This study demonstrates the effect of operating conditions (Red-GHSV, inlet H2/CO, Oprat-GHSV) and the effect of Fe-Co-Ce nanocatalyst support. A statistical model using the response surface methodology (RSM) was applied with the target of achieving higher olefins selectivity in Fischer-Tropsch synthesis, which indicates the interaction effects of factors. The conditions under which three objectives optimization for maximizing olefins and minimizing paraffins and methane were determined. Synthesized nanocatalysts with various supports were characterized by XRD, SEM and TPR techniques
Collapse
|
6
|
Sharma A, Foppen JW, Banerjee A, Sawssen S, Bachhar N, Peddis D, Bandyopadhyay S. Magnetic Nanoparticles to Unique DNA Tracers: Effect of Functionalization on Physico-chemical Properties. NANOSCALE RESEARCH LETTERS 2021; 16:24. [PMID: 33547989 PMCID: PMC7867676 DOI: 10.1186/s11671-021-03483-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Accepted: 01/18/2021] [Indexed: 06/12/2023]
Abstract
To monitor and manage hydrological systems such as brooks, streams, rivers, the use of tracers is a well-established process. Limited number of potential tracers such as salts, isotopes and dyes, make study of hydrological processes a challenge. Traditional tracers find limited use due to lack of multiplexed, multipoint tracing and background noise, among others. In this regard, DNA based tracers possess remarkable advantages including, environmentally friendly, stability, and high sensitivity in addition to showing great potential in the synthesis of ideally unlimited number of unique tracers capable of multipoint tracing. To prevent unintentional losses in the environment during application and easy recovery for analysis, we hereby report DNA encapsulation in silica containing magnetic cores (iron oxide) of two different shapes-spheres and cubes. The iron oxide nanoparticles having size range 10-20 nm, have been synthesized using co-precipitation of iron salts or thermal decomposition of iron oleate precursor in the presence of oleic acid or sodium oleate. Physico-chemical properties such as size, zeta potential, magnetism etc. of the iron oxide nanoparticles have been optimized using different ligands for effective binding of dsDNA, followed by silanization. We report for the first time the effect of surface coating on the magnetic properties of the iron oxide nanoparticles at each stage of functionalization, culminating in silica shells. Efficiency of encapsulation of three different dsDNA molecules has been studied using quantitative polymerase chain reaction (qPCR). Our results show that our DNA based magnetic tracers are excellent candidates for hydrological monitoring with easy recoverability and high signal amplification.
Collapse
Affiliation(s)
- Anuvansh Sharma
- Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway
| | - Jan Willem Foppen
- Department of Water Science and Engineering, IHE Delft Institute for Water Education, PO Box 3015, Delft, The Netherlands
| | - Abhishek Banerjee
- Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway
| | - Slimani Sawssen
- Dipartimento di Chimica e Chimica Industriale, Università di Genova, Genoa, Italy
- Istituto di Struttura della Materia - CNR, Area della Ricerca di Roma1, 00015, Monterotondo Scalo, RM, Italy
| | - Nirmalya Bachhar
- Department of Chemical Engineering, Indian Institute of Technology Jodhpur, Jodhpur, 342037, India
| | - Davide Peddis
- Dipartimento di Chimica e Chimica Industriale, Università di Genova, Genoa, Italy
- Istituto di Struttura della Materia - CNR, Area della Ricerca di Roma1, 00015, Monterotondo Scalo, RM, Italy
| | - Sulalit Bandyopadhyay
- Department of Water Management, Delft University of Technology, PO Box 5048, 2600 GA, Delft, The Netherlands.
- Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway.
| |
Collapse
|
7
|
Talone A, Ruggiero L, Slimani S, Imperatori P, Barucca G, Ricci MA, Sodo A, Peddis D. Magnetic mesoporous silica nanostructures: investigation of magnetic properties. NANOTECHNOLOGY 2020; 31:465707. [PMID: 32877370 DOI: 10.1088/1361-6528/abac7c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Magnetic mesoporous silica (MS) nanocomposites provide the possibility of generating multi-functional objects for application in different technological areas. This paper focuses on the magnetic properties of nanocomposites constituted by spinel iron oxide nanoparticles (magnetic nanoparticles (MNPs), < D > ≈ 8-9 nm) embedded in an MS matrix. The mesoporous structure of the silica matrix and the presence of the nanoparticles inside clearly emerge from transmission electron microscopy (TEM) measurements. Low temperature (5 K) field-dependent magnetization measurements reveal saturation magnetization (MS ) close to bulk value (M S bulk ∼ 90 emu g-1) for both MNPs and MNP/MS nanocomposites, indicating that the presence of silica does not affect the magnetic features of the single MNPs. Moreover, the dependence of the remanent magnetization on field (i.e. δM plots) at low temperature has shown a small but evident decrease of interaction in an MNP/MS sample with respect to MNP samples A m2 Kg-1. Finally, a partial orientation of the easy axis is observed when the MNPs are embedded in the silica matrix.
Collapse
Affiliation(s)
- A Talone
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Monterotondo Scalo (RM), Italy. Dipartimento di Scienze, Università degli Studi 'Roma Tre', Roma, Italy
| | | | | | | | | | | | | | | |
Collapse
|
8
|
Vasilakaki M, Ntallis N, Bellusci M, Varsano F, Mathieu R, Fiorani D, Peddis D, Trohidou KN. Effect of albumin mediated clustering on the magnetic behavior of MnFe 2O 4 nanoparticles: experimental and theoretical modeling study. NANOTECHNOLOGY 2020; 31:025707. [PMID: 31603864 DOI: 10.1088/1361-6528/ab4764] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Over the last two decades, iron oxide based nanoparticles ferrofluids have attracted significant attention for a wide range of applications. For the successful use of these materials in biotechnology and energy, surface coating and specific functionalization is critical to achieve high dispersibility and colloidal stability of the nanoparticles in the ferrofluids. In view of this, the magnetic behavior of clusters of ultra-small MnFe2O4 nanoparticles covered by bovine serum albumin, which is known as a highly biocompatible and environmentally friendly surfactant, is investigated by magnetization measurements, and numerical simulations at an atomic and mesoscopic scale. The coating process with albumin produces a change in the structure, actual size and shape distribution of clusters of exchange coupled particles, giving rise to a distribution of blocking temperatures. The coated system exhibits a superspin glass (SSG) behavior with the SSG freezing temperatures similar to the uncoated ones, providing evidence that the strength of the dipolar interactions is not affected by the presence of the albumin. The DFT calculations show that the albumin coating reduces the surface anisotropy and the saturation magnetization in the nanoparticles leading to lower values of the coercive field in agreement with the experimental findings. Our results clearly demonstrate that the albumin coated clusters of MnFe2O4 particles are ideal systems for energy and biomedical applications since colloidal and thermal stability as well as biosafety is obtained through the albumin coating.
Collapse
Affiliation(s)
- Marianna Vasilakaki
- Institute of Nanoscience and Nanotechnology, NCSR 'Demokritos,'Aghia Paraskevi, Attiki, 153 10, Greece
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Levada K, Omelyanchik A, Rodionova V, Weiskirchen R, Bartneck M. Magnetic-Assisted Treatment of Liver Fibrosis. Cells 2019; 8:E1279. [PMID: 31635053 PMCID: PMC6830324 DOI: 10.3390/cells8101279] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 10/07/2019] [Accepted: 10/15/2019] [Indexed: 12/12/2022] Open
Abstract
Chronic liver injury can be induced by viruses, toxins, cellular activation, and metabolic dysregulation and can lead to liver fibrosis. Hepatic fibrosis still remains a major burden on the global health systems. Nonalcoholic fatty liver disease (NAFLD) and nonalcoholic steatohepatitis (NASH) are considered the main cause of liver fibrosis. Hepatic stellate cells are key targets in antifibrotic treatment, but selective engagement of these cells is an unresolved issue. Current strategies for antifibrotic drugs, which are at the critical stage 3 clinical trials, target metabolic regulation, immune cell activation, and cell death. Here, we report on the critical factors for liver fibrosis, and on prospective novel drugs, which might soon enter the market. Apart from the current clinical trials, novel perspectives for anti-fibrotic treatment may arise from magnetic particles and controlled magnetic forces in various different fields. Magnetic-assisted techniques can, for instance, enable cell engineering and cell therapy to fight cancer, might enable to control the shape or orientation of single cells or tissues mechanically. Furthermore, magnetic forces may improve localized drug delivery mediated by magnetism-induced conformational changes, and they may also enhance non-invasive imaging applications.
Collapse
Affiliation(s)
- Kateryna Levada
- Institute of Physics, Mathematics and Information Technology, Immanuel Kant Baltic Federal University, 236016 Kaliningrad, Russia.
| | - Alexander Omelyanchik
- Institute of Physics, Mathematics and Information Technology, Immanuel Kant Baltic Federal University, 236016 Kaliningrad, Russia.
| | - Valeria Rodionova
- Institute of Physics, Mathematics and Information Technology, Immanuel Kant Baltic Federal University, 236016 Kaliningrad, Russia.
- National University of Science and Technology "MISiS", 119049 Moscow, Russia.
| | - Ralf Weiskirchen
- Institute of Molecular Pathobiochemistry, Experimental Gene Therapy and Clinical Chemistry, RWTH University Hospital Aachen, D-52074 Aachen, Germany.
| | - Matthias Bartneck
- Department of Medicine III, Medical Faculty, RWTH Aachen, D-52074 Aachen, Germany.
| |
Collapse
|
10
|
Sayed F, Muscas G, Jovanovic S, Barucca G, Locardi F, Varvaro G, Peddis D, Mathieu R, Sarkar T. Controlling magnetic coupling in bi-magnetic nanocomposites. NANOSCALE 2019; 11:14256-14265. [PMID: 31318002 DOI: 10.1039/c9nr05364f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Magnetic nanocomposites constitute a vital class of technologically relevant materials, in particular for next-generation applications ranging from biomedicine, catalysis, and energy devices. Key to designing such materials is determining and controlling the extent of magnetic coupling in them. In this work, we show how the magnetic coupling in bi-magnetic nanocomposites can be controlled by the growth technique. Using four different synthesis strategies to prepare prototypical LaFeO3-CoFe2O4 and LaFeO3-Co0.5Zn0.5Fe2O4 nanocomposite systems, and by performing comprehensive magnetic measurements, we demonstrate that the final material exhibits striking differences in their magnetic coupling that is distinct to the growth method. Through structural and morphological studies, we confirm the link between the magnetic coupling and growth methods due to distinct levels of particle agglomeration at the very microscopic scale. Our studies reveal an inverse relationship between the strength of magnetic coupling and the degree of particle agglomeration in the nanocomposites. Our work presents a basic concept of controlling the particle agglomeration to tune magnetic coupling, relevant for designing advanced bi-magnetic nanocomposites for novel applications.
Collapse
Affiliation(s)
- F Sayed
- Department of Engineering Sciences, Uppsala University, Box 534, SE-75121 Uppsala, Sweden.
| | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Sarkar T, Muscas G, Barucca G, Locardi F, Varvaro G, Peddis D, Mathieu R. Tunable single-phase magnetic behavior in chemically synthesized AFeO 3-MFe 2O 4 (A = Bi or La, M = Co or Ni) nanocomposites. NANOSCALE 2018; 10:22990-23000. [PMID: 30500041 DOI: 10.1039/c8nr06922k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The properties of magnetic nanocomposites rely strongly on the interplay between those of the constituent components. When the individual components themselves are complex systems belonging to the family of correlated electron oxide systems which typically exhibit exotic physical properties, it becomes nontrivial to customize the properties of the nanocomposite. In this paper, we demonstrate an easy, but effective method to synthesize and tune the magnetic properties of nanocomposites consisting of correlated electron oxide systems as the individual components. Our method is based on a novel synthesis technique by which the two components of the nanocomposite can be directly integrated with each other, yielding homogeneous samples on the nanoscale with magnetic behavior reminiscent of a single phase. We illustrate our method using multiferroic BiFeO3 (BFO) and LaFeO3 (LFO) as the major phase (i.e., matrix), and MFe2O4 (M = Co2+ or Ni2+) as the embedded magnetic phase. Furthermore, we show that by a proper selection of the second phase in the nanocomposite, it is possible to customize the magnetic properties of the matrix. We illustrate this by choosing CoFe2O4 and NiFe2O4, two oxides with widely differing magnetic anisotropies, as the embedded phase, and demonstrate that the coercivity of BFO and LFO can be increased or decreased depending on the choice of the embedded phase in the nanocomposite.
Collapse
Affiliation(s)
- T Sarkar
- Department of Engineering Sciences, Uppsala University, Box 534, SE-75121 Uppsala, Sweden.
| | | | | | | | | | | | | |
Collapse
|
12
|
Taherzadeh Lari T, Mirzaei AA, Atashi H. Influence of Fabrication Temperature and Time on Light Olefin Selectivity of Iron–Cobalt–Cerium Mixed Oxide Nanocatalyst for CO Hydrogenation. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b03171] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tahereh Taherzadeh Lari
- Department of Chemistry,
Faculty of Science, University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran
| | - Ali Akbar Mirzaei
- Department of Chemistry,
Faculty of Science, University of Sistan and Baluchestan, P.O. Box 98135-674, Zahedan, Iran
| | - Hossein Atashi
- Department of Chemical
Engineering, Faculty of Engineering, University of Sistan and Baluchestan, P.O. Box 98164-161, Zahedan, Iran
| |
Collapse
|