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Nasser A, Qdemat A, Unterweger H, Tietze R, Sun X, Landers J, Kopp J, Wu B, Appavou MS, Murmiliuk A, Gilbert EP, Petracic O, Feoktystov A. Impact of coating type on structure and magnetic properties of biocompatible iron oxide nanoparticles: insights into cluster organization and oxidation stability. Phys Chem Chem Phys 2024; 26:24912-24923. [PMID: 39291756 DOI: 10.1039/d4cp01735h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2024]
Abstract
Superparamagnetic iron oxide nanoparticles (SPIONs) are a promising tool for biomedical applications, including drug delivery, imaging, and magnetic hyperthermia. However, their tendency to agglomerate limits their performance efficiency. To overcome this limitation, a coating can be applied during or after synthesis. This work investigates the effect of three biocompatible coatings, namely sodium citrate, (3-aminopropyl)triethoxysilane (APTES), and dextran, on controlling the agglomeration of iron oxide nanoparticles. Various experimental techniques were used to characterize the structural and magnetic properties of the coated nanoparticles, including cryogenic transmission electron microscopy (cryo-TEM), magnetometry, Mössbauer spectroscopy, and small-angle X-ray and neutron scattering. The results indicate that the coatings effectively stabilize the nanoparticles, leading to clusters of different sizes that modify their magnetic behaviour due to magnetic inter-particle interactions. The oxidation kinetics of the nanoparticles prepared with the various coating materials were investigated to characterize their oxidation behaviour and stability over time. This research provides valuable insights into the design of an optimized nanoparticle functionalization strategy for biomedical applications.
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Affiliation(s)
- Amal Nasser
- Department of Physics, Technical University Munich (TUM), Garching, Germany
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS at MLZ, Garching, Germany.
| | - Asma Qdemat
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS-2, Jülich, Germany.
| | - Harald Unterweger
- ENT Department, Section of Experimental Oncology and Nanomedicine (SEON), Else Kroener-Fresenius-Stiftung-Professorship, University Hospital Erlangen, Germany
| | - Rainer Tietze
- ENT Department, Section of Experimental Oncology and Nanomedicine (SEON), Else Kroener-Fresenius-Stiftung-Professorship, University Hospital Erlangen, Germany
| | - Xiao Sun
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - Joachim Landers
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, D-47057 Duisburg, Germany
| | - Juri Kopp
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, D-47057 Duisburg, Germany
| | - Baohu Wu
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS at MLZ, Garching, Germany.
| | - Marie-Sousai Appavou
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS at MLZ, Garching, Germany.
| | - Anastasiia Murmiliuk
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS at MLZ, Garching, Germany.
| | - Elliot Paul Gilbert
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, NSW 2234, Australia
| | - Oleg Petracic
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS-2, Jülich, Germany.
| | - Artem Feoktystov
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS at MLZ, Garching, Germany.
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Mbuyazi TB, Ajibade PA. Magnetic iron oxides nanocomposites: synthetic techniques and environmental applications for wastewater treatment. DISCOVER NANO 2024; 19:158. [PMID: 39342049 PMCID: PMC11438764 DOI: 10.1186/s11671-024-04102-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Accepted: 09/03/2024] [Indexed: 10/01/2024]
Abstract
Nanomaterials are an emerging class of compounds with potential to advance technology for wastewater treatment. There are many toxic substances in industrial wastewater that are dangerous to the aquatic ecosystem and public health. These pollutants require the development of novel techniques to remove them from the environment. Iron oxide nanoparticles are being studied and develop as new technology to address the problem of environmental pollution due to their unique properties and effectiveness against different kind of pollutants. A variety of modified iron oxide nanoparticles have been developed through extensive research that mitigates the shortcomings of aggregation or oxidation and enhances their efficiency as novel remediator against environmental pollutants. In this review, we present synthetic approaches used for the preparation of iron oxide nanoparticles and their corresponding nanocomposites, along with the processes in which the materials are used as adsorbent/photocatalysts for environmental remediation. Applications explored includes adsorption of dyes, photocatalytic degradation of dyes, and adsorption of heavy metal ions. The use of iron oxides nanocomposite in real wastewater samples and recyclability of adsorbents and photocatalysts were also explored.
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Affiliation(s)
- Thandi B Mbuyazi
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville, 3209, South Africa
| | - Peter A Ajibade
- School of Chemistry and Physics, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville, 3209, South Africa.
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3
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Li Z, Zhao B, Zhang H, Zhang Y. High-throughput calculations and machine learning modeling of 17O NMR in non-magnetic oxides. Faraday Discuss 2024. [PMID: 39258887 DOI: 10.1039/d4fd00128a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2024]
Abstract
The only NMR-active oxygen isotope, oxygen-17 (17O), serves as a sensitive probe due to its large chemical shift range, the electric field gradient at the oxygen site, and the quadrupolar interaction. Consequently, 17O solid-state NMR offers unique insights into local structures and finds significant applications in the studies of disorder, reactivity, and host-guest chemistry. Despite recent advances in sensitivity enhancement, isotopic labeling, and NMR crystallography, the application of 17O solid-state NMR is still hindered by low natural abundance, costly enrichment, and challenges in handling spectrum signals. Density functional theory calculations and machine learning techniques offer an alternative approach to mapping the local crystal structures to NMR parameters. However, the lack of high-quality data remains a challenge, despite the establishment of some datasets. In this study, we implement and execute a high-throughput workflow combining AiiDA and CASTEP to evaluate the NMR parameters. Focusing on non-magnetic oxides, we have chosen over 7100 binary, ternary, and quaternary compounds from the Materials Project database and performed calculations. Furthermore, using various descriptors for the local crystalline environments, we model the 17O NMR parameters using machine learning techniques, further enhancing our ability to predict and understand 17O NMR parameters in oxide crystals.
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Affiliation(s)
- Zhiyuan Li
- TU Darmstadt, Otto-Berndt-Straße 3, 64287 Darmstadt, Germany.
| | - Bo Zhao
- TU Darmstadt, Otto-Berndt-Straße 3, 64287 Darmstadt, Germany.
| | - Hongbin Zhang
- TU Darmstadt, Otto-Berndt-Straße 3, 64287 Darmstadt, Germany.
| | - Yixuan Zhang
- TU Darmstadt, Otto-Berndt-Straße 3, 64287 Darmstadt, Germany.
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4
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Biswas B, Rahman ML, Ahmed MF, Sharmin N. Extraction of gamma iron oxide (γ-Fe 2O 3) nanoparticles from waste can: Structure, morphology and magnetic properties. Heliyon 2024; 10:e30810. [PMID: 38778945 PMCID: PMC11109832 DOI: 10.1016/j.heliyon.2024.e30810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 05/06/2024] [Accepted: 05/06/2024] [Indexed: 05/25/2024] Open
Abstract
In this work, the transformation of waste iron cans to gamma iron oxide (γ-Fe2O3) nanoparticles following acid leaching precipitation method along with their structural, surface chemistry, and magnetic properties was studied. Highly magnetic iron-based nanomaterials, maghemite with high saturation magnetization have been synthesized through an acid leaching technique by carefully tuning of pH and calcination temperature. The phase composition and crystal structure, surface morphology, surface chemistry, and surface composition of the synthesized γ-Fe2O3 nanoparticles were explored by X-ray diffraction (XRD), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Energy-dispersive X-ray spectroscopy (EDS). The XRD results confirm the cubic spinel structure having crystallite size 26.90-52.15 nm. The XPS study reveals the presence of Fe, O element and the binding energy of Fe (710.31 and 724.48 eV) confirms the formation of γ-Fe2O3 as well. By dynamic light scattering (DLS) method and zeta potential analyzer, the particle size distribution and stability of the systems were investigated. The magnetic behavior of the synthesized γ-Fe2O3 nanoparticles were studied using a vibrating sample magnetometer (VSM) which confirmed the ferrimagnetic particles with saturation magnetization of 54.94 emu/g. The resultant maghemite nanoparticles will be used in photocatalysts and humidity sensing. The net impact of the work stated here is based on the principle of converting waste into useful nanomaterials. Finally, it was concluded that our results can give insights into the design of the synthesis procedure from the precursor to the high-quality gamma iron oxide nanoparticles with high saturation magnetization for different potential applications which are inexpensive and very simple.
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Affiliation(s)
- Bristy Biswas
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka, 1205, Bangladesh
| | - Md. Lutfor Rahman
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka, 1205, Bangladesh
| | - Md. Farid Ahmed
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka, 1205, Bangladesh
| | - Nahid Sharmin
- Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka, 1205, Bangladesh
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5
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Paparoni F, Alizon G, Zitolo A, Rezvani SJ, Di Cicco A, Magnan H, Fonda E. A novel electrochemical flow-cell for operando XAS investigations in X-ray opaque supports. Phys Chem Chem Phys 2024; 26:3897-3906. [PMID: 38230576 DOI: 10.1039/d3cp04701f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Improvement of electrochemical technologies is one of the most popular topics in the field of renewable energy. However, this process requires a deep understanding of the electrode-electrolyte interface behavior under operando conditions. X-ray absorption spectroscopy (XAS) is widely employed to characterize electrode materials, providing element-selective oxidation state and local structure. Several existing cells allow studies as close as possible to realistic operating conditions, but most of them rely on the deposition of the electrodes on conductive and X-ray transparent materials, from where the radiation impinges the sample. In this work, we present a new electrochemical flow-cell for operando XAS that can be used with X-ray opaque substrates, since the signal is effectively detected from the electrode surface, as the radiation passes through a thin layer of electrolyte (∼17 μm). The electrolyte can flow over the electrode, reducing bubble formation and avoiding strong reactant concentration gradients. We show that high-quality data can be obtained under operando conditions, thanks to the high efficiency of the cell from the hard X-ray regime down to ∼4 keV. We report as a case study the operando XAS investigation at the Fe and Ni K-edges on Ni-doped γ-Fe2O3 films, epitaxially grown on Pt substrates. The effect of the Ni content on the catalytic performances for the oxygen evolution reaction is discussed.
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Affiliation(s)
- Francesco Paparoni
- Synchrotron SOLEIL, Départementale 128, 91190 Saint-Aubin, France.
- Sez. Fisica, Scuola di Scienze e Tecnologie, Universitá di Camerino, via Madonna delle Carceri, I-62032 Camerino, Italy
| | - Guillaume Alizon
- Synchrotron SOLEIL, Départementale 128, 91190 Saint-Aubin, France.
| | - Andrea Zitolo
- Synchrotron SOLEIL, Départementale 128, 91190 Saint-Aubin, France.
| | - Seyed Javad Rezvani
- Sez. Fisica, Scuola di Scienze e Tecnologie, Universitá di Camerino, via Madonna delle Carceri, I-62032 Camerino, Italy
- CNR-IOM, SS14 - km 163.5 in Area Science Park, 34149, Trieste, Italy
| | - Andrea Di Cicco
- Sez. Fisica, Scuola di Scienze e Tecnologie, Universitá di Camerino, via Madonna delle Carceri, I-62032 Camerino, Italy
| | - Hélène Magnan
- Université Paris-Saclay, CEA, CNRS, Service de Physique de l'Etat Condensé, F-91191 Gif-sur-Yvette, France
| | - Emiliano Fonda
- Synchrotron SOLEIL, Départementale 128, 91190 Saint-Aubin, France.
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Oskoui PR, Rezvani M. Structure and magnetic properties of SiO2-FeO-CaO-Na2O bioactive glass-ceramic system for magnetic fluid hyperthermia application. Heliyon 2023; 9:e18519. [PMID: 37593629 PMCID: PMC10432186 DOI: 10.1016/j.heliyon.2023.e18519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 07/18/2023] [Accepted: 07/19/2023] [Indexed: 08/19/2023] Open
Abstract
Ferrimagnetic glass-ceramics comprising maghemite crystals were synthesized for magnetic fluid hyperthermia (MFH) usage. The present work is focused on the result of the chemical composition and heat treatment temperature on the magnetic behavior of ( 60 - x ) S i O 2 - ( 10 + x ) F e O - 20 C a O - 10 N a 2 O , 0 ≤ x ≤ 30 glass-ceramic system. It was observed that with the increasing of FeO from 10 to 40 wt% in the glass-ceramic compound, the percentage of maghemite phase increased. It was also seen that in the low heat treatment temperature (680 °C ), by adding iron oxide up to 30 wt%, iron cations acts as a network former, and more than this amount acts as a network modifier. In contrast, iron cations in the same composition range at high temperatures (840 °C ), acts as a network modifier. According to the VSM results, the maximum magnetization of glass-ceramics incremented from 0.23 emu/g to 0.30 emu/g with the increase in FeO percentage. It was also observed that with the increment of iron oxide percentage, the morphology of maghemite crystals changed from spherical to dumbbell-shaped.
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Affiliation(s)
- P. Rastgoo Oskoui
- Department of Materials Engineering, University of Tabriz, Tabriz, Iran
| | - M. Rezvani
- Department of Materials Engineering, University of Tabriz, Tabriz, Iran
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7
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Usvaliev AD, Belogurova NG, Pokholok KV, Finko AV, Prusov AN, Golovin DY, Miroshnikov KA, Golovin YI, Klyachko NL. E. coli Cell Lysis Induced by Lys394 Enzyme Assisted by Magnetic Nanoparticles Exposed to Non-Heating Low-Frequency Magnetic Field. Pharmaceutics 2023; 15:1871. [PMID: 37514057 PMCID: PMC10384812 DOI: 10.3390/pharmaceutics15071871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 06/20/2023] [Accepted: 06/28/2023] [Indexed: 07/30/2023] Open
Abstract
The spreading of microbial pathogens with more and more resistance to traditional low-molecular antibiotic agents demands new approaches to antibacterial therapy. The employment of bacteriophage enzymes capable of breaking bacterial cell walls has attracted much interest within this context. The specific features of the morphology of Gram-negative bacteria prevent the effective direct usage of lytic enzymes and require assistance from additional helpers to facilitate cell lysis. The current work is devoted to the study of boosting the lysis of Escherichia coli (E. coli) JM 109 and MH 1 strains induced by Lys394 bacteriophage endolysin by means of rod-like (56 × 13 nm) magnetic nanoparticles (MNPs) activated by a non-heating low-frequency magnetic field (LF MF) with a frequency of 50 Hz and a flux density of 68.5 mT in a pulse-pause mode (1 s on and 0.3 s off). According to theoretical assumptions, the mechanism of MNP assistance is presumably based upon the disordering of the outer membrane that facilitates enzyme permeation into peptidoglycans to its substrate. It is found that the effect of the LF MF reaches an almost a twofold acceleration of the enzyme reaction, resulting in almost 80 and 70%, respectively, of lysed E. coli JM 109 and MH 1 cells in 21 min. An increase in the membrane permeability was proven by two independent experiments employing β-lactamase periplasmic enzyme leakage and Nile Red (NR) hydrophobic dye fluorescence. It is shown that the outer membrane disordering of E. coli caused by exposure to LF MF nanoparticle movement leads to almost complete (more than 80%) β-lactamase release out of the cells' periplasm to the buffer suspension. Experiments with NR (displaying fluorescence in a non-polar medium only) reveal a drastic reduction in NR fluorescence intensity, reaching a change of an order of magnitude when exposed to LF MF. The data obtained provide evidence of changes in the bacterial cell wall structure. The result shown open up the prospects of non-heating LF MF application in enhancing enzyme activity against Gram-negative pathogens.
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Affiliation(s)
- Azizbek D Usvaliev
- School of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
- Skolkovo Institute of Science and Technology, Moscow 121205, Russia
| | | | | | - Alexander V Finko
- School of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Andrey N Prusov
- A.N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow 119992, Russia
| | - Dmitry Yu Golovin
- Institute of Nanomaterials and Nanotechnologies, G.R. Derzhavin Tambov State University, Tambov 392000, Russia
| | - Konstantin A Miroshnikov
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia
| | - Yuri I Golovin
- School of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
- Institute of Nanomaterials and Nanotechnologies, G.R. Derzhavin Tambov State University, Tambov 392000, Russia
| | - Natalia L Klyachko
- School of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
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Uddin MJ, Jeong YK. Application of magnesium ferrite nanomaterials for adsorptive removal of arsenic from water: Effects of Mg and Fe ratio. CHEMOSPHERE 2022; 307:135817. [PMID: 35964725 DOI: 10.1016/j.chemosphere.2022.135817] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 07/08/2022] [Accepted: 07/20/2022] [Indexed: 06/15/2023]
Abstract
Magnesium ferrites (MgFe2O4) drew much attention in water treatment because of higher stability, magnetic properties, availability and higher safety. MgFe2O4 having different Fe and Mg ratios were synthesized through a simple one-step solvothermal method and applied for the removal of toxic arsenic oxyanions from water. Three different magnesium ferrites, MF0.1, MF0.2 and MF0.33, were synthesized using molar Mg and Fe ratio of 10:90, 20:80 and 33:67, respectively. The Mg and Fe ratio affected the physical and magnetic properties, surface area, crystallite size, pore diameter and magnetism, of magnesium ferrites, which were evidenced by the XRD, SEM-EDS, BET and VSM. Increasing Mg content reduced the pore size, pore volume and saturation magnetization but increased surface area and pHPZC. It was estimated that defective iron oxide, γ-Fe2O3 maghemite, had been formed with the magnesium ferrites, when the ratios of Mg and Fe were non-stoichiometric. The difference in characteristics of magnesium ferrites synthesized with three ratios of Mg and Fe affected arsenic adsorption capacity and the stability of adsorbed arsenic. Arsenic adsorption data followed Freundlich isotherm model and maximum As(III) and As(V) adsorption capacities were found to be 51.48, 100.53, 103.94 mg/g and 26.06, 43.44, 45.52 mg/g by MF0.1, MF0.2 and MF0.33, respectively. Fast adsorption of arsenic was confirmed by kinetic data which followed the Pseudo-2nd-order kinetic model. The MF0.33 having stoichiometric ratio of Mg and Fe showed higher adsorption capacity and stability for arsenic than the other two at neutral pH.
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Affiliation(s)
- Md Jamal Uddin
- Department of Soil and Environmental Science, University of Barisal, Kornokathi, Barishal, 8254, Bangladesh.
| | - Yeon-Koo Jeong
- Department of Environmental Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi, Gyeongbuk, 39177, Republic of Korea.
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9
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Iron oxide nanoparticles synthesized by a glycine-modified coprecipitation method: Structure and magnetic properties. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Magnetic Core-Shell Iron Oxides-Based Nanophotocatalysts and Nanoadsorbents for Multifunctional Thin Films. MEMBRANES 2022; 12:membranes12050466. [PMID: 35629792 PMCID: PMC9144956 DOI: 10.3390/membranes12050466] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 04/12/2022] [Accepted: 04/19/2022] [Indexed: 02/01/2023]
Abstract
In recent years, iron oxides-based nanostructured composite materials are of particular interest for the preparation of multifunctional thin films and membranes to be used in sustainable magnetic field adsorption and photocatalysis processes, intelligent coatings, and packing or bio-medical applications. In this paper, superparamagnetic iron oxide (core)-silica (shell) nanoparticles suitable for thin films and membrane functionalization were obtained by co-precipitation and ultrasonic-assisted sol-gel methods. The comparative/combined effect of the magnetic core co-precipitation temperature (80 and 95 °C) and ZnO-doping of the silica shell on the photocatalytic and nano-sorption properties of the resulted composite nanoparticles were investigated by ultraviolet-visible (UV-VIS) spectroscopy monitoring the discoloration of methylene blue (MB) solution under ultraviolet (UV) irradiation and darkness, respectively. The morphology, structure, textural, and magnetic parameters of the investigated powders were evidenced by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, Brunauer–Emmett–Teller (BET) measurements, and saturation magnetization (vibrating sample magnetometry, VSM). The intraparticle diffusion model controlled the MB adsorption. The pseudo- and second-order kinetics described the MB photodegradation. When using SiO2-shell functionalized nanoparticles, the adsorption and photodegradation constant rates are three–four times higher than for using starting core iron oxide nanoparticles. The obtained magnetic nanoparticles (MNPs) were tested for films deposition.
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Pourmadadi M, Ahmadi MJ, Dinani HS, Ajalli N, Dorkoosh F. Theranostic applications of stimulus-responsive systems based on Fe2O3. Pharm Nanotechnol 2022; 10:90-112. [PMID: 35142274 DOI: 10.2174/2211738510666220210105113] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 11/18/2021] [Accepted: 11/26/2021] [Indexed: 11/22/2022]
Abstract
According to the interaction of nanoparticles with biological systems, enthusiasm for nanotechnology in biomedical applications has been developed in the past decades. Fe2O3 nanoparticles, as the most stable iron oxide, have special merits that make them useful widely for detecting diseases, therapy, drug delivery, and monitoring the therapeutic process. This review presents the fabrication methods of Fe2O3-based materials and their photocatalytic and magnetic properties. Then, we highlight the application of Fe2O3-based nanoparticles in diagnosis and imaging, different therapy methods, and finally, stimulus-responsive systems, such as pH-responsive, magnetic-responsive, redox-responsive, and enzyme-responsive, with an emphasis on cancer treatment. In addition, the potential of Fe2O3 to combine diagnosis and therapy within a single particle called theranostic agent will be discussed.
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Affiliation(s)
- Mehrab Pourmadadi
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Mohammad Javad Ahmadi
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | | | - Narges Ajalli
- School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Farid Dorkoosh
- Faculty of Pharmacy, Tehran University of Medical Science, Tehran, Iran
- Medical Biomaterial Research Center (MBR), Tehran University of Medical Science, Tehran, Iran
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12
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e Castro LL, Amorim CCC, Miranda JPV, Cassiano TDSA, Paula FLDO. The role of small separation interactions in ferrofluid structure. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.128082] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Acharya P, Manso RH, Hoffman AS, Bakovic SIP, Kékedy-Nagy L, Bare SR, Chen J, Greenlee LF. Fe Coordination Environment, Fe-Incorporated Ni(OH)2 Phase, and Metallic Core Are Key Structural Components to Active and Stable Nanoparticle Catalysts for the Oxygen Evolution Reaction. ACS Catal 2022. [DOI: 10.1021/acscatal.1c04881] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Prashant Acharya
- Ralph E. Martin Department of Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Ryan H. Manso
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Adam S. Hoffman
- Stanford Synchrotron Radiation Lightsource, Menlo Park, California 94025, United States
| | - Sergio I. Perez Bakovic
- Ralph E. Martin Department of Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - László Kékedy-Nagy
- Ralph E. Martin Department of Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
- Department of Electrical and Computer Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada
| | - Simon R. Bare
- Stanford Synchrotron Radiation Lightsource, Menlo Park, California 94025, United States
| | - Jingyi Chen
- Department of Chemistry & Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Lauren F. Greenlee
- Ralph E. Martin Department of Chemical Engineering, University of Arkansas, Fayetteville, Arkansas 72701, United States
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
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14
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Lee KJ, Ratih K, Kim GJ, Lee YR, Shin JS, Chung KH, Choi EJ, Kim EK, An JH. Immunomodulatory and anti-inflammatory efficacy of hederagenin-coated maghemite (γ-Fe 2O 3) nanoparticles in an atopic dermatitis model. Colloids Surf B Biointerfaces 2021; 210:112244. [PMID: 34896691 DOI: 10.1016/j.colsurfb.2021.112244] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 11/09/2021] [Accepted: 11/21/2021] [Indexed: 11/25/2022]
Abstract
We investigated the immunomodulatory and anti-inflammatory efficacy of hederagenin coating on maghemite (γ-Fe2O3) nanoparticles (HM) in atopic dermatitis (AD), as well as the physical and optical properties of maghemite nanoparticles (MP) using SEM, XRD spectroscopy, UV-vis spectra, Raman spectra, and FTIR spectroscopy. Dose-dependent treatment with HM (10, 50, 100, 200 μg/mL) inhibited the expression of Interleukin-2 (IL-2) and Tumor necrosis factor- α (TNF-α) in inflammatory induced HaCaT and Jurkat cells with inflammation caused by TNF/IFN-γ and PMA/A23187. AD model was induced by performing topical application of 2,4-dinitrochlorobenzene (DNCB) and dermatophagoides farinae extract (DFE) for a 31-day period on 8-week-old BALB/c mice. The HM treatments efficiently diminished the AD-like cutaneous lesion induced by DNCB-DFE sensitization in mice. Compared to the AD-only groups, HM treatment considerably attenuated mast cell infiltration and lowered epidermal, and dermal thickness of mice ears skin. In addition, HM treatment prominently alleviated the enlarged size and weight of lymph nodes. Furthermore, HM treatment resulted in a notable reduction in the mRNA expression of Th1 cytokines (TNF-α and IFN-γ), Th2 cytokines (IL-4 and IL-6), Th17 (IL-17), and TSLP. Our data showed that HM provides better AD attenuation compared to MP. Additionally, HM had synergistic effect and act as anti-inflammatory and immunomodulatory agent. Thus, HM shows great potential in AD medication and as a substitution of non-steroid-based medication.
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Affiliation(s)
- Kwon-Jai Lee
- College of H-LAC, Daejeon University, Daejeon 34520, Republic of Korea
| | - Khoirunnisa Ratih
- Department of Food Science and Technology, Seoul National University of Science & Technology, Seoul 01811, Republic of Korea; Department of Food Science and Nutrition, KC University, Seoul 07661, Republic of Korea
| | - Gyeong-Ji Kim
- Department of Food Science and Nutrition, KC University, Seoul 07661, Republic of Korea; Department of Biomedical Engineering, Sogang University, Seoul 04107, Republic of Korea
| | - Yu-Rim Lee
- Department of Food Science and Technology, Seoul National University of Science & Technology, Seoul 01811, Republic of Korea; Department of Food Science and Nutrition, KC University, Seoul 07661, Republic of Korea
| | - Jae-Soo Shin
- Department of Advanced Materials Engineering, Daejeon University, Daejeon 34520, Republic of Korea
| | - Kang-Hyun Chung
- Department of Food Science and Technology, Seoul National University of Science & Technology, Seoul 01811, Republic of Korea
| | - Eun-Ju Choi
- Department of Physical Education, Daegu Catholic University, Gyeongsan, Republic of Korea
| | - Eun-Kyung Kim
- Department of Food Science and Nutrition, Dong-A University, Busan 49315, Republic of Korea
| | - Jeung Hee An
- Department of Food Science and Nutrition, KC University, Seoul 07661, Republic of Korea.
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15
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Khalid S, Riaz S, Naeem S, Akbar A, Sajjad Hussain S, Xu YB, Naseem S. Spin polarization and magneto-dielectric coupling in Al-modified thin iron oxide films -microwave mediated sol-gel approach. J IND ENG CHEM 2021. [DOI: 10.1016/j.jiec.2021.06.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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16
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Ovejero JG, Spizzo F, Morales MP, Del Bianco L. Nanoparticles for Magnetic Heating: When Two (or More) Is Better Than One. MATERIALS (BASEL, SWITZERLAND) 2021; 14:6416. [PMID: 34771940 PMCID: PMC8585339 DOI: 10.3390/ma14216416] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 10/20/2021] [Accepted: 10/22/2021] [Indexed: 01/16/2023]
Abstract
The increasing use of magnetic nanoparticles as heating agents in biomedicine is driven by their proven utility in hyperthermia therapeutic treatments and heat-triggered drug delivery methods. The growing demand of efficient and versatile nanoheaters has prompted the creation of novel types of magnetic nanoparticle systems exploiting the magnetic interaction (exchange or dipolar in nature) between two or more constituent magnetic elements (magnetic phases, primary nanoparticles) to enhance and tune the heating power. This process occurred in parallel with the progress in the methods for the chemical synthesis of nanostructures and in the comprehension of magnetic phenomena at the nanoscale. Therefore, complex magnetic architectures have been realized that we classify as: (a) core/shell nanoparticles; (b) multicore nanoparticles; (c) linear aggregates; (d) hybrid systems; (e) mixed nanoparticle systems. After a general introduction to the magnetic heating phenomenology, we illustrate the different classes of nanoparticle systems and the strategic novelty they represent. We review some of the research works that have significantly contributed to clarify the relationship between the compositional and structural properties, as determined by the synthetic process, the magnetic properties and the heating mechanism.
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Affiliation(s)
- Jesus G. Ovejero
- Departamento de Energía, Medio Ambiente y Salud, Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain; (J.G.O.); (M.P.M.)
- Servicio de Dosimetría y Radioprotección, Hospital General Universitario Gregorio Marañón, E-28007 Madrid, Spain
| | - Federico Spizzo
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy;
| | - M. Puerto Morales
- Departamento de Energía, Medio Ambiente y Salud, Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain; (J.G.O.); (M.P.M.)
| | - Lucia Del Bianco
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy;
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17
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Schaefer MV, Abernathy MJ, Nguyen D, Cornell T, Ying SC. Firing Increases Arsenic Leaching from Ceramic Water Filters via Arsenic and Iron Phase Transformations. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:9826-9835. [PMID: 34232034 PMCID: PMC8761037 DOI: 10.1021/acs.est.1c00169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Ceramic water filters (CWFs) are produced globally using local clay sources and can effectively remove bacterial pathogens during point-of-use water treatment. The ceramic production process involves firing clay mixed with burnout material at temperatures of 800-1100 °C, which induces mineralogical changes leading to increased arsenic (As) leaching from CWF material compared to source clay. Unfired clay and fired CWFs from Cambodia, Canada, and Mexico, CWF from Laos, and test-fired clay from the United States were analyzed to determine the extent of As leaching from CWFs that range in As (<1 to 16 mg kg-1) and iron (Fe) (0.6 to 5%) content. Deionized water, NaOH, HCl, and oxalate extractions showed that firing increased As solubility and decreased Fe solubility compared to unfired clay, with up to 8 mg kg-1 of water-soluble As in Cambodian CWFs. X-ray absorption spectra of the Cambodian clay and CWF showed a decrease in the Fe-O distance from 2.01 to 1.91 Å and decreased Fe coordination number from 6.3 to 4.6 after firing, indicating a decrease in Fe-O coordination. Arsenic(V) was the dominant species in Cambodia clay and CWF, existing primarily as a surface complex with average As-Fe distance of 3.28 Å in clay while in CWF As was either an outer-sphere As(V) phase or a discrete arsenate phase with no significant As-Fe scattering contribution within the resolution of the data. Improved understanding of molecular-scale processes that cause increased As leaching from CWFs provides a basis for assessing As leaching potential prior to CWF factory capital investment as well as engineered solutions (e.g., modified firing temperature, material amendments, and leaching prior to distribution) to mitigate As exposure from CWFs.
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Affiliation(s)
- Michael V Schaefer
- Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801, United States
| | - Macon J Abernathy
- Environmental Toxicology Graduate Program, University of California, Riverside, California 92521, United States
| | - Dominique Nguyen
- Department of Environmental Sciences, University of California, Riverside, California 92521, United States
| | - Thida Cornell
- Department of Environmental Sciences, University of California, Riverside, California 92521, United States
| | - Samantha C Ying
- Environmental Toxicology Graduate Program, University of California, Riverside, California 92521, United States
- Department of Environmental Sciences, University of California, Riverside, California 92521, United States
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18
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Zharmagambetova A, Talgatov E, Auyezkhanova A, Tumabayev N, Bukharbayeva F. Behavior of Pd‐supported catalysts in phenylacetylene hydrogenation: Effect of combined use of
polyvinylpyrrolidone
and
NaOH
for magnetic support modification. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alima Zharmagambetova
- Laboratory of Organic Catalysis, Department of Catalysis D.V. Sokolskiy Institute of Fuel, Catalysis and Electrochemistry Kunayev Almaty Kazakhstan
| | - Eldar Talgatov
- Laboratory of Organic Catalysis, Department of Catalysis D.V. Sokolskiy Institute of Fuel, Catalysis and Electrochemistry Kunayev Almaty Kazakhstan
| | - Assemgul Auyezkhanova
- Laboratory of Organic Catalysis, Department of Catalysis D.V. Sokolskiy Institute of Fuel, Catalysis and Electrochemistry Kunayev Almaty Kazakhstan
| | - Nurmukhamet Tumabayev
- Laboratory of Organic Catalysis, Department of Catalysis D.V. Sokolskiy Institute of Fuel, Catalysis and Electrochemistry Kunayev Almaty Kazakhstan
| | - Farida Bukharbayeva
- Chair of Chemistry, Institute of Natural Sciences and Geography Abai Kazakh National Pedagogical University Almaty Kazakhstan
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19
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Myrovali E, Papadopoulos K, Iglesias I, Spasova M, Farle M, Wiedwald U, Angelakeris M. Long-Range Ordering Effects in Magnetic Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2021; 13:21602-21612. [PMID: 33929817 DOI: 10.1021/acsami.1c01820] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The challenge for synthesizing magnetic nanoparticle chains may be achieved under the application of fixation fields, which are the externally applied fields, enhancing collective magnetic features due to adequate control of dipolar interactions among magnetic nanoparticles. However, relatively little attention has been devoted to how size, concentration of magnetic nanoparticles, and intensity of an external magnetic field affect the evolution of chain structures and collective magnetic features. Here, iron oxide nanoparticles are developed by the coprecipitation method at diameters below (10 and 20 nm) and above (50 and 80 nm) their superparamagnetic limit (at about 25 nm) and then are subjected to a tunable fixation field (40-400 mT). Eventually, the fixation field dictates smaller particles to form chain structures in two steps, first forming clusters and then guiding chain formation via "cluster-cluster" interactions, whereas larger particles readily form chains via "particle-particle" interactions. In both cases, dipolar interactions between the neighboring nanoparticles augment, leading to a substantial increase in their collective magnetic features which in turn results in magnetic particle hyperthermia efficiency enhancement of up to one order of magnitude. This study provides new perspectives for magnetic nanoparticles by arranging them in chain formulations as enhanced performance magnetic actors in magnetically driven magnetic applications.
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Affiliation(s)
- Eirini Myrovali
- School of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
- Magnetic Nanostructure Characterization: Technology and Applications, CIRI-AUTH, Thessaloniki 57001, Greece
| | - Kyrillos Papadopoulos
- School of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
- Magnetic Nanostructure Characterization: Technology and Applications, CIRI-AUTH, Thessaloniki 57001, Greece
| | - Irene Iglesias
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg 47048, Germany
| | - Marina Spasova
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg 47048, Germany
| | - Michael Farle
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg 47048, Germany
| | - Ulf Wiedwald
- Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Duisburg 47048, Germany
| | - Makis Angelakeris
- School of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
- Magnetic Nanostructure Characterization: Technology and Applications, CIRI-AUTH, Thessaloniki 57001, Greece
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20
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Natali M, Tamburini S, Bertani R, Desideri D, Mozzon M, Pavarin D, Spizzo F, Del Bianco L, Zorzi F, Sgarbossa P. Novel Magnetic Inorganic Composites: Synthesis and Characterization. Polymers (Basel) 2021; 13:1284. [PMID: 33920795 PMCID: PMC8071178 DOI: 10.3390/polym13081284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 04/11/2021] [Accepted: 04/13/2021] [Indexed: 12/24/2022] Open
Abstract
The addition of magnetic particles to inorganic matrices can produce new composites exhibiting intriguing properties for practical applications. It has been previously reported that the addition of magnetite to concrete improves its mechanical properties and durability in terms of water and chloride ions absorption. Here we describe the preparation of novel magnetic geopolymers based on two different matrices (G1 without inert aggregates and G2 with inert quartz aggregates) containing commercial SrFe12O19 particles with two weight concentrations, 6% and 11%. The composites' characterization, including chemical, structural, morphological, and mechanical determinations together with magnetic and electrical measurements, was carried out. The magnetic study revealed that, on average, the SrFe12O19 magnetic particles can be relatively well dispersed in the inorganic matrix. A substantial increase in the composite samples' remanent magnetization was obtained by embedding in the geopolymer SrFe12O19 anisotropic particles at a high concentration under the action of an external magnetic field during the solidification process. The new composites exhibit good mechanical properties (as compressive strength), higher than those reported for high weight concretes bearing a similar content of magnetite. The impedance measurements indicate that the electrical resistance is mainly controlled by the matrix's chemical composition and can be used to evaluate the geopolymerization degree.
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Affiliation(s)
- Marco Natali
- ICMATE, CNR, Corso Stati Uniti 4, 35127 Padova, Italy; (M.N.); (S.T.)
| | - Sergio Tamburini
- ICMATE, CNR, Corso Stati Uniti 4, 35127 Padova, Italy; (M.N.); (S.T.)
| | - Roberta Bertani
- Department of Industrial Engineering, University of Padova, Via Marzolo 9 (P.S., R.B., M.M.), Via Gradenigo 6/a (D.D.) and Via Venezia 1 (D.P.), 35131 Padova, Italy; (R.B.); (D.D.); (M.M.); (D.P.)
| | - Daniele Desideri
- Department of Industrial Engineering, University of Padova, Via Marzolo 9 (P.S., R.B., M.M.), Via Gradenigo 6/a (D.D.) and Via Venezia 1 (D.P.), 35131 Padova, Italy; (R.B.); (D.D.); (M.M.); (D.P.)
| | - Mirto Mozzon
- Department of Industrial Engineering, University of Padova, Via Marzolo 9 (P.S., R.B., M.M.), Via Gradenigo 6/a (D.D.) and Via Venezia 1 (D.P.), 35131 Padova, Italy; (R.B.); (D.D.); (M.M.); (D.P.)
| | - Daniele Pavarin
- Department of Industrial Engineering, University of Padova, Via Marzolo 9 (P.S., R.B., M.M.), Via Gradenigo 6/a (D.D.) and Via Venezia 1 (D.P.), 35131 Padova, Italy; (R.B.); (D.D.); (M.M.); (D.P.)
| | - Federico Spizzo
- Department of Physics and Earth Science, Polo Scientifico Tecnologico, University of Ferrara, Via G. Saragat 1, 44122 Ferrara, Italy; (F.S.); (L.D.B.)
| | - Lucia Del Bianco
- Department of Physics and Earth Science, Polo Scientifico Tecnologico, University of Ferrara, Via G. Saragat 1, 44122 Ferrara, Italy; (F.S.); (L.D.B.)
| | | | - Paolo Sgarbossa
- Department of Industrial Engineering, University of Padova, Via Marzolo 9 (P.S., R.B., M.M.), Via Gradenigo 6/a (D.D.) and Via Venezia 1 (D.P.), 35131 Padova, Italy; (R.B.); (D.D.); (M.M.); (D.P.)
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21
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Köhler T, Feoktystov A, Petracic O, Kentzinger E, Bhatnagar-Schöffmann T, Feygenson M, Nandakumaran N, Landers J, Wende H, Cervellino A, Rücker U, Kovács A, Dunin-Borkowski RE, Brückel T. Mechanism of magnetization reduction in iron oxide nanoparticles. NANOSCALE 2021; 13:6965-6976. [PMID: 33885498 DOI: 10.1039/d0nr08615k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Iron oxide nanoparticles are presently considered as main work horses for various applications including targeted drug delivery and magnetic hyperthermia. Several questions remain unsolved regarding the effect of size onto their overall magnetic behavior. One aspect is the reduction of magnetization compared to bulk samples. A detailed understanding of the underlying mechanisms of this reduction could improve the particle performance in applications. Here we use a number of complementary experimental techniques including neutron scattering and synchrotron X-ray diffraction to arrive at a consistent conclusion. We confirm the observation from previous studies of a reduced saturation magnetization and argue that this reduction is mainly associated with the presence of antiphase boundaries, which are observed directly using high-resolution transmission electron microscopy and indirectly via an anisotropic peak broadening in X-ray diffraction patterns. Additionally small-angle neutron scattering with polarized neutrons revealed a small non-magnetic surface layer, that is, however, not sufficient to explain the observed loss in magnetization alone.
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Affiliation(s)
- Tobias Köhler
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS at Heinz Maier-Leibnitz Zentrum MLZ, 85748 Garching, Germany.
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22
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Mdlovu NV, Lin KS, Chen Y, Wu CM. Formulation of magnetic nanocomposites for intracellular delivery of micro-RNA for MYCN inhibition in neuroblastoma. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126264] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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23
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Ovejero JG, Spizzo F, Morales MP, Del Bianco L. Mixing iron oxide nanoparticles with different shape and size for tunable magneto-heating performance. NANOSCALE 2021; 13:5714-5729. [PMID: 33704298 DOI: 10.1039/d0nr09121a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Tuning the magnetic properties of nanoparticles is a strategic goal to use them in the most effective way to perform specific functions in the nanomedicine field. We report a systematic study carried out on a set of samples obtained by mixing together iron oxide nanoparticles with different shape: elongated with aspect ratio ∼5.2 and mean volume of the order of 103 nm3 (excluding the silica coating) and spherical with mean volume one order of magnitude larger. These structural features of the nanoparticles together with their aggregation state determine the magnetic anisotropy and the magnetic relaxation processes. In particular, the spherical nanoparticles turn out to be more stable against superparamagnetic relaxation. Mixing the nanoparticles in different proportions allows to modulate the magnetic response of the samples. The two populations of nanoparticles magnetically influence each other through a mean field mechanism, which depends crucially on temperature and rules the hysteretic magnetic properties and their thermal evolution. This magnetic phenomenology has a direct impact on the ability of the mixed samples to generate heat under an alternating magnetic field, a key function in view of nanomedicine applications. Under proper testing conditions, the heating efficiency of the mixed samples is larger compared to that obtained as the sum of those of the parent nanoparticles. This occurs thanks to the mean field produced by the magnetically blocked spherical nanoparticles that stabilizes the thermally fluctuating moments of the elongated ones, which therefore contribute more effectively to the heat production.
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Affiliation(s)
- Jesus G Ovejero
- Dept. Energía, Medio Ambiente y Salud, Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain.
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24
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Righi G, Magri R. Surface reducibility, reactivity, and stability induced by noble metal modifications on the γ-Fe 2O 3maghemite (001) surfaces. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:425004. [PMID: 32615542 DOI: 10.1088/1361-648x/aba21c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Accepted: 07/02/2020] [Indexed: 06/11/2023]
Abstract
In these last years large research efforts have been devoted to the synthesis and investigation of reducible metal oxide surfaces modified with metal atoms and nanoparticles for improving their performance in a number of advanced applications. Among reducible metal oxides, iron oxides have the advantage to be made up from two of the most common elements on Earth. In this paper we analyze the structural, electronic, and magnetic consequences of the insertion of isolated noble metal atoms (Cu, Ag, Au) on theγ-Fe2O3(001) surface. We have considered many different configurations for the single atoms: adsorbed, substitutional to iron atoms, or to oxygen atoms, and, using first principles calculations, we have studied how the presence of the noble metal atoms on the surface influences the surface stability, its reducibility, and, therefore, its catalytic activity, and how these properties depend on the kind of noble metal atom and its position. Our results show that noble metal atoms adsorbed on the surface facilitate the adsorption of CO molecules, and, among them, Cu atoms are those that bind best to the surface also providing the strongest adsorption energy for the CO molecule. At ambient temperature and pressure the noble metal atoms prefer to substitute the iron atoms than to just adsorb on the surface, but for Ag atoms the adsorption and substitutional energies are very close. The surfaces with Ag in place of Fe are the most reducible and reactive for exchange of oxygen atoms. Finally, Au is the best noble metal for oxygen substitution. Our results provide useful insights for the researchers designing and synthesizing new noble metal-iron oxides nanostructures for applications in biology, medicine, catalysis, and chemical analysis.
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Affiliation(s)
- Giulia Righi
- CNR-S3 Institute of Nanoscience, via Campi 213/A, 41100 Modena, Italy
- Department of Physics, Informatics, and Mathematics of the University of Modena and Reggio-Emilia, Italy
| | - Rita Magri
- CNR-S3 Institute of Nanoscience, via Campi 213/A, 41100 Modena, Italy
- Department of Physics, Informatics, and Mathematics of the University of Modena and Reggio-Emilia, Italy
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