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Auteur : Grafiati
Publié le 11 septembre 2023

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1

Kesavan, V., D. Dhar, Y. Koltypin, N. Perkas, O. Palchik, A. Gedanken et S. Chandrasekaran. « Nanostructured amorphous metals, alloys, and metal oxides as new catalysts for oxidation ». Pure and Applied Chemistry 73, no 1 (1 janvier 2001) : 85–91. http://dx.doi.org/10.1351/pac200173010085.

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The oxidation of cyclohexane with molecular oxygen in the presence of isobutyraldehyde catalyzed by nanostructured iron and cobalt oxides and iron oxide supported on titania has been studied. Nanostructured cobalt oxide on MCM-41 is found to be efficient for catalytic aerobic epoxidation of olefins.
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2

Kerli, Süleyman, et Ali Kemal Soğuksu. « Production of iron oxide and nickel oxide nanostructural particles, investigation of the supercapacitor and photocatalytic properties ». Zeitschrift für Kristallographie - Crystalline Materials 234, no 11-12 (18 décembre 2019) : 725–31. http://dx.doi.org/10.1515/zkri-2019-0043.

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AbstractIn this study, iron oxide, nickel oxide, and nickel-iron oxide nanostructured particles were produced by the hydrothermal method. X-ray diffraction (XRD) and SEM measurements were performed to investigate the physical properties of these nanostructured particles. According to the XRD results, the crystal properties of these particles were determined. From the SEM images, these particles understood to be nano-structured. The electrodes were examined for electrochemical properties by using these nanostructured particles. Electrochemical measurements of the produced electrodes were performed, and capacitance values and impedance spectra of the electrodes were determined. The specific capacitance values of the iron oxide, nickel-iron oxide, and nickel oxide nanostructured particles, respectively are 30 F/g, 55 F/g, and 67 F/g. Also, the photocatalytic activities of nanostructured particles were investigated. This examination methylene blue (MB) was used and made under a xenon lamp. In light of our findings, it was observed that high photocatalytic degradation rate. Nickel-iron oxide nanostructured particles, the degradation of MB were found to be about 87%.
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Aubekerov, K., K. N. Punegova, R. Sergeenko, A. Kuznetsov, V. M. Kondratev, S. A. Kadinskaya, S. S. Nalimova et V. A. Moshnikov. « Synthesis and study of gas sensitive ZnFe2O4-modified ZnO nanowires ». Journal of Physics : Conference Series 2227, no 1 (1 mars 2022) : 012014. http://dx.doi.org/10.1088/1742-6596/2227/1/012014.

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Abstract Currently, new nanostructured materials based on composite metal oxides is of great interest for the development of gas sensors with improved functional characteristics. In this work, zinc oxide nanowires were synthesized by hydrothermal method. Hierarchical ZnO/ZnFe2O4 nanostructures were obtained by immersion of zinc oxide layers in ferrous sulphate aqueous solution. The mechanism of zinc ferrite formation during the interaction of zinc oxide with iron sulphate is considered. The crystal structure of ZnO and ZnO/ZnFe2O4 were studied by Raman spectroscopy. The sensitivity of ZnO and ZnO/ZnFe2O4 nanostructures to isopropyl alcohol vapors was analyzed. It was shown that there is an optimal concentration of ferrous sulphate used to modify zinc oxide nanowires and synthesize ZnO/ZnFe2O4 composite nanostructures.
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Ye, Zhi Guo, Xian Liang Zhou, Hui Min Meng, Xiao Zhen Hua, Ying Hu Dong et Ai Hua Zou. « The Electrochemical Characterization of Electrochemically Synthesized MnO2-Based Mixed Oxides for Supercapacitor Applications ». Advanced Materials Research 287-290 (juillet 2011) : 1290–98. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1290.

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Nanostructured elements, including: manganese-molybdenum (Mn-Mo) oxide, manganese-molybdenum-tungsten (Mn-Mo-W) oxide, manganese-molybdenum-iron (Mn-Mo-Fe) oxide, manganese-molybdenum-cobalt (Mn-Mo-Co) oxide, manganese-vanadium-tungsten (Mn-V-W) oxide, manganese-vanadium-iron (Mn-V-Fe) oxide and manganese-iron (Mn-Fe) oxide, have been anodically deposited onto titanium substrates by employing an iridium dioxide interlayer (Ti/IrO2anode). The electrochemical characteristics of the resultant oxide deposits have been investigated by cyclic voltammetry (CV) in an aqueous 0.1 M Na2SO4solution. The voltammetric behaviors of the oxide deposits observed are significantly influenced by the doped elements. Molybdenum doping is found to be advantageous at improving the capacitance characteristics of anodically deposited manganese oxide. Comparatively, iron and vanadium doping are found to be unfavorable. The structure and crystallinity of these deposits have been identified by X-ray diffraction (XRD). The surface morphologies of these oxides were acquired from field emission scanning electron microscopes (FESEM). The high values of electrical parameters for the doped deposits are attributed to the net-like and sponge-like nanostructure, and low crystallinity of the doped manganese oxides. The deposit of Mn-Mo oxides exhibits an excellent capacitive-like behavior, possessing the maximum specific capacitance of 810 F g-1at a CV scan rate of 5 mV s-1in aqueous 0.1 M Na2SO4solution.
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MODAN, ECATERINA MAGDALENA, CATALIN MARIAN DUCU, CARMEN MIHAELA TOPALA, SORIN GEORGIAN MOGA, DENIS AURELIAN NEGREA et ADRIANA GABRIELA PLAIASU. « NANOSTRUCTURED IRON OXIDE POWDERS BY MICROWAVE ASSISTED SYNTHESIS ». Journal of Science and Arts 21, no 4 (30 décembre 2021) : 1081–94. http://dx.doi.org/10.46939/j.sci.arts-21.4-b03.

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A range of nanostructured oxides with excellent properties is used in technology and science for applications in several fields: catalysis, gas detection, biomedical applications. The most studied forms of oxides are hematite, maghemite and magnetite. In this study, microwave-assisted hydrolytic synthesis and microwave-assisted coprecipitation synthesis are described for the preparation of undoped and doped iron oxide powders using iron (III) chloride (FeCl3), potassium chloride (KCl) as precursors and sodium hydroxide (NaOH) solution as a hydrolysis agent. Microwave-assisted hydrolysis was performed at different concentrations of FeCl3 precursor: 0.1 M, 0.4 M, 0.7 M to which a constant concentration of hydrolysis agent was added, and the synthesis to obtain potassium-doped powders consisted of co-precipitation of 0.1M FeCl3 and 0.025M KCl precursor solutions in the presence of 2M NaOH hydrolysis agent. The developed powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The novelty is the use of potassium as a doping element for iron oxide, for potential application as catalyst. Hematite doped with 5% K was obtained by microwave-assisted coprecipitation synthesis. The presence of K was evidenced by EDS, while XRD spectra indicate successful doping of iron oxide with potassium, either interstitially or by substitution. By microwave synthesis, an increase in particle size was observed with increasing calcination temperature. The formation of the crystalline hematite phase was not obtained in the microwave heating process but following calcination of the powder
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6

Valero-Navarro, Angel, Jorge F. Fernandez-Sanchez, Antonio Segura-Carretero, Ursula E. Spichiger-Keller, Alberto Fernandez-Gutierrez, Pascual Oña et Ignacio Fernandez. « Iron-phthalocyanine complexes immobilized in nanostructured metal oxide as optical sensors of NOx and CO : NMR and photophysical studies ». Journal of Porphyrins and Phthalocyanines 13, no 04n05 (avril 2009) : 616–23. http://dx.doi.org/10.1142/s1088424609000796.

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This paper presents the research that is currently undergoing in our group toward the development of optical sensing layers based on iron(II) phthalocyanine complexes immobilized on nanostructured solid supports. Several FePc - N donor ligands have been prepared and coated into different nanostructured metal oxides. Optical properties, chemical variables, analytical features, selectivity rates, response times and type of nanostructure supports have been evaluated; in some cases, interesting correlations between them have been deduced. In addition, thermostability studies have been carried out, providing access to a second generation of nanostructured metal oxides.
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7

Ismail, Syahriza, Nur Syafini Saad et Jeeferie Abd Razak. « Nanostructured Hematite Prepared by Thermal Oxidation of Iron ». Key Engineering Materials 694 (mai 2016) : 208–12. http://dx.doi.org/10.4028/www.scientific.net/kem.694.208.

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This paper reports on the synthesis of iron oxide nanowires using thermal oxidation of iron. The α-Fe2O3 (hematite) and Fe3O4 (magnetite) were successfully formed using this method. The morphological observation was done through the FESEM, while the XRD, EDX and Raman spectroscopy were used to determine the physical and structural properties of the produced nanostructures. It was found that the peaks intensities relative to the hematite, increased with the extent of oxidation period. The growth and final morphology of hematite was significantly controlled by the heating duration. A surface diffusion mechanism for nano-hematite growth was then proposed to account for the growth phenomena of this nanostructured formation.
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8

Yang, Yuyun, Juncen Zhou, Rainer Detsch, Nicola Taccardi, Svenja Heise, Sannakaisa Virtanen et Aldo R. Boccaccini. « Biodegradable nanostructures : Degradation process and biocompatibility of iron oxide nanostructured arrays ». Materials Science and Engineering : C 85 (avril 2018) : 203–13. http://dx.doi.org/10.1016/j.msec.2017.12.021.

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9

Rudenkov, A. S., M. A. Yarmolenko, A. A. Rogachev, A. P. Surzhikov, A. P. Luchnikov et O. A. Frolova. « Phase composition and morphology of nanostructured coatings deposited by laser dispersion of a mixture of polyethylene with iron oxalate ». Bulletin of the Karaganda University. "Physics" Series 99, no 3 (30 septembre 2020) : 22–30. http://dx.doi.org/10.31489/2020ph3/22-30.

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Peculiarities of forming of iron oxide coatings with reinforced carbon nanostructures from gas phase generated by laser dispersion of composite target were explored. Influence of technological modes of heat treatment on morphology and phase composition of nanostructured film layers was determined. It was found that on a substrate highly dispersed layers containing carbon nanostructures are formed. Using Raman spectroscopy it was shown that in oxide matrix carbon structures, which are mainly in the form of planar located nanotubes, appear. It was found that with a mass ratio of polyethylene and iron oxalate equal to 1:1, the distribution of the formed nanostructures in size is unimodal with a maximum near 20 nm. At dispersing of polyethylene and iron oxalate mixture with mass ratio 1:2 in deposited layers nanotubes have the least defectiveness. Patterns of influence on morphology and coatings phase composition of relative component abundance in being dispersed by laser radiation composite target were determined. It was shown that with the growing of iron oxalate concentration in the target coating structural heterogeneity increases, subroughness and average size of separate nanostructures in the deposited condensate grow. The obtained polymer matrix nanocomposite films can be used in sensors.
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10

Kharlamova, M. V., N. A. Sapoletova, A. A. Eliseev, I. P. Suzdalev, Yu V. Maksimov, A. V. Lukashin et Yu D. Tret’yakov. « Optical properties of nanostructured γ iron oxide ». Doklady Chemistry 415, no 1 (juillet 2007) : 176–79. http://dx.doi.org/10.1134/s0012500807070063.

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11

Kazantsev, S. O., et A. M. Kondranova. « Synthesis and properties of porous nanostructured iron oxide ». IOP Conference Series : Materials Science and Engineering 447 (21 novembre 2018) : 012070. http://dx.doi.org/10.1088/1757-899x/447/1/012070.

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12

Gupta, R. K., K. Ghosh, L. Dong et P. K. Kahol. « Structural and magnetic properties of nanostructured iron oxide ». Physica E : Low-dimensional Systems and Nanostructures 43, no 5 (mars 2011) : 1095–98. http://dx.doi.org/10.1016/j.physe.2011.01.008.

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13

Trandafir, D. L., C. Mirestean, R. V. F. Turcu, B. Frentiu, D. Eniu et S. Simon. « Structural characterization of nanostructured hydroxyapatite–iron oxide composites ». Ceramics International 40, no 7 (août 2014) : 11071–78. http://dx.doi.org/10.1016/j.ceramint.2014.03.124.

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14

Kaushik, Ajeet, Pratima R Solanki, Keiichi Kaneto, C. G. Kim, Sharif Ahmad et Bansi D Malhotra. « Nanostructured Iron Oxide Platform for Impedimetric Cholesterol Detection ». Electroanalysis 22, no 10 (8 avril 2010) : 1045–55. http://dx.doi.org/10.1002/elan.200900468.

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15

Huang, Wei, Xinxin Xiao, Christian Engelbrekt, Minwei Zhang, Shuo Li, Jens Ulstrup, Lijie Ci, Jinkui Feng, Pengchao Si et Qijin Chi. « Graphene encapsulated Fe3O4 nanorods assembled into a mesoporous hybrid composite used as a high-performance lithium-ion battery anode material ». Materials Chemistry Frontiers 1, no 6 (2017) : 1185–93. http://dx.doi.org/10.1039/c6qm00252h.

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A new nanostructured mesoporous composite comprised of 75% iron oxide nanorods and 25% reduced graphene oxide shows high electrochemical performances as a promising lithium-ion battery anode material.
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16

Liardet, Laurent, Jordan E. Katz, Jingshan Luo, Michael Grätzel et Xile Hu. « An ultrathin cobalt–iron oxide catalyst for water oxidation on nanostructured hematite photoanodes ». Journal of Materials Chemistry A 7, no 11 (2019) : 6012–20. http://dx.doi.org/10.1039/c8ta12295d.

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17

Yadel, Cindy, Aude Michel, Sandra Casale et Jerome Fresnais. « Hyperthermia Efficiency of Magnetic Nanoparticles in Dense Aggregates of Cerium Oxide/Iron Oxide Nanoparticles ». Applied Sciences 8, no 8 (27 juillet 2018) : 1241. http://dx.doi.org/10.3390/app8081241.

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Iron oxide nanoparticles are intended to be used in bio-applications for drug delivery associated with hyperthermia. However, their interactions with complex media often induces aggregation, and thus a detrimental decrease of their heating efficiency. We have investigated the role of iron oxide nanoparticles dispersion into dense aggregates composed with magnetic/non-magnetic nanoparticles and showed that, when iron oxide nanoparticles were well-distributed into the aggregates, the specific absorption rate reached 79% of the value measured for the well-dispersed case. This study should have a strong impact on the applications of magnetic nanoparticles into nanostructured materials for therapy or catalysis applications.
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18

Rodrigues, Fabiele Schaefer, Marcela Trojahn Nunes et Jocenir Boita. « Obtenção de catalisador nanoestruturado utilizando óxido de ferro suportado em resíduo de cerâmica vermelha ». Ciência e Natura 40 (12 mars 2019) : 94. http://dx.doi.org/10.5902/2179460x35504.

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The use of nanoparticles in the field of catalysis has been the object of study by the scientific community, due to the high catalytic activity that the nanoparticles have in front of some reactions of technological interest. The objective of this work is to obtain a nanostructured catalyst using iron oxide supported on red ceramic residue (RCV), through nanostructures synthesized by the hydrothermal method, measured through the absorption of lightning in the XANES region through the National Laboratory of Synchrotron Light LNLS).
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19

Doğan, C. P., et J. C. Rawers. « Stabilizing the nanostructure in ball-milled iron alloys through the addition of oxide precipitates ». Proceedings, annual meeting, Electron Microscopy Society of America 54 (11 août 1996) : 226–27. http://dx.doi.org/10.1017/s0424820100163599.

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High-energy ball milling has proved to be an effective means of producing nanostructured metal alloys from elemental powders. Interest has focussed on this processing method because of its potential to form metastable compositions with a combination of properties not attainable by more conventional processing techniques. Consolidation of the resulting powders into commercially-viable solids has proven difficult, however. Because of the metastable nature of the compositions formed and the extremely high boundary area that makes up the nanostructure, these materials are very susceptible to exposure to elevated temperatures. Since most conventional consolidation techniques involve high temperatures, the nanostructure within the powders is typically lost during this processing step. Thus, a reliable means of enhancing the thermal stability of these materials, allowing economical consolidation, is clearly needed.One possible method to enhance thermal stability is to introduce a homogeneous distribution of stable second phase particles that will pin the grain boundaries, allowing retention of the nanostructure at temperatures high enough for effective consolidation.
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Yu, Seung-Ho, Xiaohui Guo, Daishun Ling, Dong Young Chung, Aihua Jin, Mohammadreza Shokouhimehr, Taeghwan Hyeon et Yung-Eun Sung. « Facile synthesis of nanostructured carbon nanotube/iron oxide hybrids for lithium-ion battery anodes ». RSC Adv. 4, no 70 (2014) : 37365–70. http://dx.doi.org/10.1039/c4ra05945j.

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21

Xia, Qiuying, Meng Xu, Hui Xia et Jianping Xie. « Nanostructured Iron Oxide/Hydroxide-Based Electrode Materials for Supercapacitors ». ChemNanoMat 2, no 7 (24 mai 2016) : 588–600. http://dx.doi.org/10.1002/cnma.201600110.

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22

Luna Martínez, Juan Fco, E. Reyes-Melo, Virgilio González-González, A. Torres-Castro, Carlos Guerrero-Salazar et Selene Sepúlveda-Guzmán. « Iron Oxide Nanoparticles Obtained from a Fe(II) - Chitosan Polymer Film ». Materials Science Forum 644 (mars 2010) : 51–55. http://dx.doi.org/10.4028/www.scientific.net/msf.644.51.

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In this work, iron oxide nanoparticles (~5 nm) embedded in a chitosan polymer film, were synthesized. In order to obtain this nanostructured material, firstly a homogenous film of Fe(II)-chitosan was prepared. The resulting composite film has a thickness of ~140μm. Iron oxide nanoparticles were in-situ synthesized by treating the composite film with H2O2 under alkaline conditions. The morphological analysis by Transmission Electron Microscopy (TEM) shows the nanoparticles were embedded and stabilized in chitosan polymer film. The magnetic behavior was studied by magnetization measurements. The magnetization curves at room temperature showed that iron oxide nanoparticles have a superparamagnetic behavior.
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23

Zhang, Yuzhe, Bin Wang, Qian Cheng, Xinling Li et Zhongyu Li. « Removal of Toxic Heavy Metal Ions (Pb, Cr, Cu, Ni, Zn, Co, Hg, and Cd) from Waste Batteries or Lithium Cells Using Nanosized Metal Oxides : A Review ». Journal of Nanoscience and Nanotechnology 20, no 12 (1 décembre 2020) : 7231–54. http://dx.doi.org/10.1166/jnn.2020.18748.

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How to remove harmful heavy metal ions from waste batteries or lithium cells efficiently has been the focus of scholars. More and more metal oxides had been used to deal with the pollution of heavy metal caused by waste batteries in recent years. Nanostructured metal oxides have great potential because of their large comparative areas. The adsorption for these heavy metal ions can be further improved by using modified metal oxides as adsorbents. At present, iron oxide is widely used in this field. Other metal oxides have also been studied in removing these heavy metal ions. Compared to other metal oxides, the adsorbents made of iron oxide are easy to be separated from the reaction system. pH value in the solution can affect the activity of adsorption sites on metal oxides adsorbents and change the distribution of ions in solution. As a result, pH value can significantly influence the adsorption of metal oxides adsorbents for heavy metal ions from waste batteries or lithium cells.
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Oliveira, Henrique S., Luiz C. A. Oliveira, Márcio C. Pereira, José D. Ardisson, Patterson P. Souza, Patrícia O. Patrício et Flávia C. C. Moura. « Nanostructured vanadium-doped iron oxide : catalytic oxidation of methylene blue dye ». New Journal of Chemistry 39, no 4 (2015) : 3051–58. http://dx.doi.org/10.1039/c4nj02063d.

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Thangavel, Balamurugan, Sheela Berchmans et V. Ganesh. « Hollow spheres of iron oxide as an “enzyme-mimic” : preparation, characterization and application as biosensors ». New Journal of Chemistry 46, no 9 (2022) : 4212–25. http://dx.doi.org/10.1039/d1nj05460k.

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Nanostructured hollow spheres of iron oxide are demonstrated as “nanozymes” for the dual mode (spectrophotometric and electrochemical) detection of hydrogen peroxide & cholesterol biomarkers and a novel electrochemical sensing mechanism is proposed.
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Brito, Pedro, Haroldo Pinto, André Rothkirch et Anke Pyzalla. « Growth Stresses and Phase Development in Nanostructured Oxide Scales Formed on Iron Aluminides ». Materials Science Forum 638-642 (janvier 2010) : 2903–8. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.2903.

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The evolution of phase composition and growth stresses in oxide scales growing on the polycrystalline Fe-15at.%Al alloy at 700°C in air was studied by in-situ synchrotron X-ray diffraction and X-ray photoelectron spectroscopy. The oxidation kinetics was determined by thermogravimetry. The results showed that, under these conditions, metastable -Al2O3 appears only during the first minutes of oxidation and the main oxides formed since the early oxidation are -Al2O3 and -Fe2O3. High volume fractions of -Fe2O3 caused accelerated oxidation rates in the first hours. -Al2O3 and -Fe2O3 grow epitaxially, evolving compressive and tensile growth stresses, respectively.
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Balaji, Aditya, Songlin Yang, Jeslyn Wang et Jin Zhang. « Graphene Oxide-Based Nanostructured DNA Sensor ». Biosensors 9, no 2 (30 mai 2019) : 74. http://dx.doi.org/10.3390/bios9020074.

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Quick detection of DNA sequence is vital for many fields, especially, early-stage diagnosis. Here, we develop a graphene oxide-based fluorescence quenching sensor to quickly and accurately detect small amounts of a single strand of DNA. In this paper, fluorescent magnetic nanoparticles (FMNPs) modified with target DNA sequence (DNA-t) were bound onto the modified graphene oxide acting as the fluorescence quenching element. FMNPs are made of iron oxide (Fe3O4) core and fluorescent silica (SiO2) shell. The average particle size of FMNPs was 74 ± 6 nm and the average thickness of the silica shell, estimated from TEM results, was 30 ± 4 nm. The photoluminescence and magnetic properties of FMNPs have been investigated. Target oligonucleotide (DNA-t) was conjugated onto FMNPs through glutaraldehyde crosslinking. Meanwhile, graphene oxide (GO) nanosheets were produced by a modified Hummers method. A complementary oligonucleotide (DNA-c) was designed to interact with GO. In the presence of GO-modified with DNA-c, the fluorescence intensity of FMNPs modified with DNA-t was quenched through a FRET quenching mechanism. Our study indicates that FMNPs can not only act as a FRET donor, but also enhance the sensor accuracy by magnetically separating the sensing system from free DNA and non-hybridized GO. Results indicate that this sensing system is ideal to detect small amounts of DNA-t with limitation detection at 0.12 µM.
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Li, Yuan, et Y. Frank Cheng. « Photocatalytic anti-bioadhesion and bacterial deactivation on nanostructured iron oxide films ». Journal of Materials Chemistry B 6, no 10 (2018) : 1458–69. http://dx.doi.org/10.1039/c7tb03242k.

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Bacterial adhesion and biofilm formation on metals are a primary mechanism causing integrity degradation and failure of engineering structures. Photocatalytic iron oxide nano-films are effective for prevention of bioadhesion.
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MODAN, ECATERINA MAGDALENA, et ADRIANA GABRIELA PLAIASU. « STRUCTURAL EVOLUTION IN IRON OXIDE TABLETS AT VIBRATION TESTING FOR CATALYTIC CONVERTERS ». Journal of Science and Arts 22, no 2 (30 juin 2022) : 497–506. http://dx.doi.org/10.46939/j.sci.arts-22.2-b02.

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This paper presents structural evolution in iron oxide tablets at vibration testing for catalytic converters. The raw tablets composed from a mixture of cordierite powder with nanostructured iron oxide powders (pure and K-doped) and PVP binder. The analysis of the structural integrity of the raw tablets before vibration testing is evidenced by metallographic microscopic highlight the incidence of cracks. The raw tablets were mechanical vibration tested under normal operating conditions within the vibration damper to determine the structural integrity of the tablets. The mechanical vibration behavior of the tablets is essential in the development of new catalyst based on iron oxide nanoparticles for the reduction of gaseous pollutants from internal combustion engines.
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Arriaga-Arjona, L., et G. Carbajal-Franco. « Zinc oxide-Iron-Aluminum nanostructured cover for photoelectrochemical water splitting ». MRS Advances 2, no 49 (2017) : 2707–11. http://dx.doi.org/10.1557/adv.2017.534.

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ABSTRACTThe purpose of this research is to study the viability of photocatalytic water splitting using ASTM A792 Zn-Al-Fe commercial metallic sheets as substrates for electrodeposited and corroded electrodes. The nanostructures were synthesized in two different procedures: via electrodeposition of migrating species from one electrode to another and from the remaining materials after corrosion of electrodes during electrodeposition, both procedures were done immersing the metallic electrodes in FeCl3 salts dissolved in water as cell electrolyte. The released or remaining Zinc-Aluminum-Iron can be used for the construction of nanostructures or as co-catalyst on the coating over the substrate. Actual EDS-SEM data reveals incorporation of Zinc on dendrite-like structures with traces of Al-Fe due to material release and further electrodeposition on working electrode, meanwhile, dendrite-like structures with an increased amount of Iron were obtained from the corrosion in the auxiliary electrode. Finally, samples were tested with lineal voltammetry to measure the photocurrent activity as indicator of photocatalytic viability for water splitting, obtaining an improvement of 31 mA/cm2 over natural photovoltaic current generation of substrates with higher Zinc concentrations under UV-Visible radiation.
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Granitzer, P., K. Rumpf, R. Gonzalez-Rodriguez, J. Coffer, P. Poelt et M. Reissner. « Magnetic Studies of Iron Oxide Nanoparticles Encapsulated within Nanostructured Silicon ». ECS Transactions 69, no 2 (2 octobre 2015) : 79–85. http://dx.doi.org/10.1149/06902.0079ecst.

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Rangaraju, R. R., A. Panday, K. S. Raja et M. Misra. « Nanostructured anodic iron oxide film as photoanode for water oxidation ». Journal of Physics D : Applied Physics 42, no 13 (11 juin 2009) : 135303. http://dx.doi.org/10.1088/0022-3727/42/13/135303.

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Santos, J. G. M., J. R. Souza, C. J. Letti, M. A. G. Soler, P. C. Morais, M. A. Pereira-da-Silva et L. G. Paterno. « Iron Oxide Nanostructured Electrodes for Detection of Copper(II) Ions ». Journal of Nanoscience and Nanotechnology 14, no 9 (1 septembre 2014) : 6614–23. http://dx.doi.org/10.1166/jnn.2014.9379.

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Sharma, Rachna, Ved Varun Agrawal, A. K. Srivastava, Govind Govind, Lata Nain, Mohd Imran, Soumya Ranjan Kabi, R. K. Sinha et Bansi D. Malhotra. « Phase control of nanostructured iron oxide for application to biosensor ». J. Mater. Chem. B 1, no 4 (2013) : 464–74. http://dx.doi.org/10.1039/c2tb00192f.

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Lü, Weigang, Dequan Yang, Yan Sun, Yun Guo, Shuping Xie et Hulin Li. « Preparation and structural characterization of nanostructured iron oxide thin films ». Applied Surface Science 147, no 1-4 (mai 1999) : 39–43. http://dx.doi.org/10.1016/s0169-4332(98)00921-0.

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Otero-González, Lila, Sergey V. Mikhalovsky, Miroslava Václavíková, Mikhail V. Trenikhin, Andrew B. Cundy et Irina N. Savina. « Novel nanostructured iron oxide cryogels for arsenic (As(III)) removal ». Journal of Hazardous Materials 381 (janvier 2020) : 120996. http://dx.doi.org/10.1016/j.jhazmat.2019.120996.

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Deriu, Marco Agostino, Laura Madalina Popescu, Maria Francesca Ottaviani, Andrea Danani et Roxana Mioara Piticescu. « Iron oxide/PAMAM nanostructured hybrids : combined computational and experimental studies ». Journal of Materials Science 51, no 4 (3 novembre 2015) : 1996–2007. http://dx.doi.org/10.1007/s10853-015-9509-8.

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Parast, Faezeh, Mehdi Montazeri-Pour, Masoud Rajabi et Fatemeh Bavarsiha. « Comparison of the structural and photo-catalytic properties of nanostructured Fe3O4/TiO2 core-shell composites synthesized by ultrasonic and Stöber methods ». Science of Sintering 52, no 4 (2020) : 415–32. http://dx.doi.org/10.2298/sos2004415p.

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In the present research, Fe3O4/TiO2 magnetic photo-catalytic nanocomposites with a core/shell structure were successfully synthesized using two techniques of ultrasonic and St?ber. In this way, iron oxide (II, III) nanoparticles as soft magnetic cores of this composite were prepared by utilizing a chemical method assisted by ultrasound with a Fe+3/Fe+2 molar ratio of 1.5 under the nitrogen atmosphere. Thereafter, titanium oxide coating was performed on Fe3O4 nanoparticles by using tetrabutyl orthotitanate (TBOT) and titanium isopropoxide (TTIP) precursors. The resultant nanostructures were characterized by means of X-ray powder diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, energy dispersive X-ray (EDX) analysis, vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Through findings obtained from TEM examinations, the formation of core/shell nanostructure was confirmed in the prepared Fe3O4/TiO2 composites. Analysis of magnetic properties revealed that titanium oxide coating on iron oxide nanoparticles reduces saturation magnetization (Ms). The values of saturation magnetization for Fe3O4 powder and Fe3O4/TiO2 nanocomposite powders achieved via ultrasonic and St?ber methods were 60, 23 and 9 emu/g, respectively. Photo-catalytic properties of Fe3O4/TiO2 nanostructures were evaluated by the use of methylene blue dye under UV light. Results indicated that Fe3O4/TiO2 composite obtained by the St?ber method has a better photo-catalytic property as well as a decreased but acceptable magnetic separation. Degradation of methylene blue dye in the presence of photo-catalytic powder prepared by ultrasonic and St?ber procedures was 61 and 69 %, respectively, within 90 minutes of UV light exposure.
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Sundar, Sasikala, et Shakkthivel Piraman. « Greener saponin induced morphologically controlled various polymorphs of nanostructured iron oxide materials for biosensor applications ». RSC Advances 5, no 91 (2015) : 74408–15. http://dx.doi.org/10.1039/c5ra15166j.

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Dolci, Mathias, Jean-François Bryche, Cedric Leuvrey, Spyridon Zafeiratos, Simon Gree, Sylvie Begin-Colin, Gregory Barbillon et Benoit P. Pichon. « Robust clicked assembly based on iron oxide nanoparticles for a new type of SPR biosensor ». Journal of Materials Chemistry C 6, no 34 (2018) : 9102–10. http://dx.doi.org/10.1039/c8tc01166d.

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A novel strategy to create an original nanostructured SPR biosensor with enhanced sensitivity is reported. Iron oxide nanoparticle assemblies with tunable structure and decorated with bio receptors were grafted onto gold thin films by taking advantage of “click” chemistry.
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41

Guragain, Deepa, Sunil Karna, Jonghyun Choi, Romakanta Bhattarai, Tej P. Poudel, Ram Krishna Gupta, Xiao Shen et Sanjay R. Mishra. « Electrochemical Performance of Iron-Doped Cobalt Oxide Hierarchical Nanostructure ». Processes 9, no 12 (2 décembre 2021) : 2176. http://dx.doi.org/10.3390/pr9122176.

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In this study, hydrothermally produced Fe-doped Co3O4 nanostructured particles are investigated as electrocatalysts for the water-splitting process and electrode materials for supercapacitor devices. The results of the experiments demonstrated that the surface area, specific capacitance, and electrochemical performance of Co3O4 are all influenced by Fe3+ content. The FexCo3-xO4 with x = 1 sample exhibits a higher BET surface (87.45 m2/g) than that of the pristine Co3O4 (59.4 m2/g). Electrochemical measurements of the electrode carried out in 3 M KOH reveal a high specific capacitance of 153 F/g at a current density of 1 A/g for x = 0.6 and 684 F/g at a 2 mV/s scan rate for x = 1.0 samples. In terms of electrocatalytic performance, the electrode (x = 1.0) displayed a low overpotential of 266 mV (at a current density of 10 mA/cm2) along with 52 mV/dec Tafel slopes in the oxygen evolution reaction. Additionally, the overpotential of 132 mV (at a current density of 10 mA/cm2) and 109 mV with 52 mV/dec Tafel slope were obtained for x = 0.6 sample towards hydrogen evolution reaction (HER). According to electrochemical impedance spectroscopy (EIS) measurements and the density functional theory (DFT) study, the addition of Fe3+ increased the conductivity at the electrode–electrolyte interface, which substantially impacted the high activity of the iron-doped cobalt oxide. The electrochemical results revealed that the mesoporous Fe-doped Co3O4 nanostructure could be used as potential electrode material in the high-performance electrochemical capacitor and water-splitting catalysts.
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42

Yee, Maxine, et Iskandar I. Yaacob. « Synthesis and Characterization of Iron Oxide Nanostructured Particles in Na–Y Zeolite Matrix ». Journal of Materials Research 19, no 3 (mars 2004) : 930–36. http://dx.doi.org/10.1557/jmr.2004.19.3.930.

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Formation of iron oxide nanoparticles within the internal cages of Na–Y zeolites was investigated. Sodium ions within the zeolites were replaced with iron(II) ions. Elemental composition studies showed a significant amount of iron in the exchanged sample. NaOH and dropwise additions of H2O2 at 60 °C triggered formation of zeolite–iron oxide systems. X-ray diffraction (XRD) patterns showed diminishing zeolite peaks along with evolution of peaks corresponding to γ-Fe2O3 and α-Fe2O3 with increasing NaOH concentration. Morphological changes from hexagonal-shaped zeolite to clusters of fine particles were observed under scanning electron microscope. Particles with about 15-nm diameter were detected by transmission electron microscopy. γ-Fe2O3 crystallites of 13.4 nm were determined from the broadening of XRD peaks. The magnetization curves of samples (precipitated using NaOH with concentrations of 2.0 M and above) showed absence of hysteresis and passed through the origin, indicating the particles are superparamagnetic. Gas adsorption–desorption measurement of the system precipitated with 2.0 M NaOH revealed a 26% increase in its specific surface area, indicating the presence of nanometer-sized particles within the zeolites.
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43

Bobrynina, Elizaveta, Ahmad Alali Alkhalaf, Aleksey Shamshurin, Oleg Tolochko et Veselin Mikhailov. « Synthesis of Fe-ZrO2 Composite Powders by Thermochemical Method ». Key Engineering Materials 721 (décembre 2016) : 285–89. http://dx.doi.org/10.4028/www.scientific.net/kem.721.285.

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Nanostructured Fe–ZrO2 composite powders with homogeneous distribution of zirconia were synthesized by thermochemical process. The synthesis procedures are (1) preparation of precursor powder by spray-drying of solution made from water-soluble iron and zirconium nitrates, (2) air heat treatments to evaporate volatile components in the precursor powder and synthesis of nanostructured Fe2O3 +ZrO2, and (3) Fe2O3 reduction by hydrogen into pure Fe. In order to find phase containing Zr the powder was treated with 15% hydrochloric acid to dissolve iron particles. The size of the particles is less than 50 nm. Fe–ZrO2 composite powders can be used as filler for cored welding wire. Shown that particles zirconium oxide well affect the final structure of the weld.
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Thandavan, Kavitha, Sakthivel Gandhi, Swaminathan Sethuraman, John Bosco Balaguru Rayappan et Uma Maheswari Krishnan. « A novel nanostructured iron oxide–gold bioelectrode for hydrogen peroxide sensing ». Nanotechnology 22, no 26 (18 mai 2011) : 265505. http://dx.doi.org/10.1088/0957-4484/22/26/265505.

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Wu, Mao-Sung, Rung-Hau Lee, Jiin-Jiang Jow, Wein-Duo Yang, Ching-Yuan Hsieh et Biing-Jyh Weng. « Nanostructured Iron Oxide Films Prepared by Electrochemical Method for Electrochemical Capacitors ». Electrochemical and Solid-State Letters 12, no 1 (2009) : A1. http://dx.doi.org/10.1149/1.2998547.

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Popovici, Mihaela, Martí Gich, Anna Roig, Lluís Casas, Elies Molins, Cecilia Savii, Dumitru Becherescu et al. « Ultraporous Single Phase Iron Oxide−Silica Nanostructured Aerogels from Ferrous Precursors ». Langmuir 20, no 4 (février 2004) : 1425–29. http://dx.doi.org/10.1021/la035083m.

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Li, Heng, et Ying‐Jie Zhu. « Liquid‐Phase Synthesis of Iron Oxide Nanostructured Materials and Their Applications ». Chemistry – A European Journal 26, no 42 (5 juin 2020) : 9180–205. http://dx.doi.org/10.1002/chem.202000679.

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Dimulescu (Nica), Ioana, Aurelia Nechifor, Cristina Bǎrdacǎ (Urducea), Ovidiu Oprea, Dumitru Paşcu, Eugenia Totu, Paul Albu, Gheorghe Nechifor et Simona Bungău. « Accessible Silver-Iron Oxide Nanoparticles as a Nanomaterial for Supported Liquid Membranes ». Nanomaterials 11, no 5 (1 mai 2021) : 1204. http://dx.doi.org/10.3390/nano11051204.

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The present study introduces the process performances of nitrophenols pertraction using new liquid supported membranes under the action of a magnetic field. The membrane system is based on the dispersion of silver–iron oxide nanoparticles in n-alcohols supported on hollow microporous polypropylene fibers. The iron oxide–silver nanoparticles are obtained directly through cyclic voltammetry electrolysis run in the presence of soluble silver complexes ([AgCl2]−; [Ag(S2O3)2]3−; [Ag(NH3)2]+) and using pure iron electrodes. The nanostructured particles are characterized morphologically and structurally by scanning electron microscopy (SEM and HFSEM), EDAX, XRD, and thermal analysis (TG, DSC). The performances of the nitrophenols permeation process are investigated in a variable magnetic field. These studies show that the flux and extraction efficiency have the highest values for the membrane system embedding iron oxide–silver nanoparticles obtained electrochemically in the presence of [Ag(NH3)2]+ electrolyte. It is demonstrated that the total flow of nitrophenols through the new membrane system depends on diffusion, convection, and silver-assisted transport.
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Magro et Vianello. « Bare Iron Oxide Nanoparticles : Surface Tunability for Biomedical, Sensing and Environmental Applications ». Nanomaterials 9, no 11 (12 novembre 2019) : 1608. http://dx.doi.org/10.3390/nano9111608.

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Surface modification is widely assumed as a mandatory prerequisite for the real applicability of iron oxide nanoparticles. This is aimed to endow prolonged stability, electrolyte and pH tolerance as well as a desired specific surface chemistry for further functionalization to these materials. Nevertheless, coating processes have negative consequences on the sustainability of nanomaterial production contributing to high costs, heavy environmental impact and difficult scalability. In this view, bare iron oxide nanoparticles (BIONs) are arousing an increasing interest and the properties and advantages of pristine surface chemistry of iron oxide are becoming popular among the scientific community. In the authors’ knowledge, rare efforts were dedicated to the use of BIONs in biomedicine, biotechnology, food industry and environmental remediation. Furthermore, literature lacks examples highlighting the potential of BIONs as platforms for the creation of more complex nanostructured architectures, and emerging properties achievable by the direct manipulation of pristine iron oxide surfaces have been little studied. Based on authors’ background on BIONs, the present review is aimed at providing hints on the future expansion of these nanomaterials emphasizing the opportunities achievable by tuning their pristine surfaces.
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Chilimoniuk, Paulina, Robert P. Socha et Tomasz Czujko. « Nanoporous Anodic Aluminum-Iron Oxide with a Tunable Band Gap Formed on the FeAl3 Intermetallic Phase ». Materials 13, no 16 (6 août 2020) : 3471. http://dx.doi.org/10.3390/ma13163471.

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Nanostructured anodic oxide layers on an FeAl3 intermetallic alloy was prepared by two-step anodization in 20 wt.% H2SO4 at 0 °C. The obtained anodic oxide coating was subjected to phase and chemical composition analysis using XPS and XRD techniques. An analysis of the band gap of individual coatings was also performed. The applied parameters of the anodization process were determined, enabling the formation of a nanostructured coating on the FeAl3 intermetallic alloy. Tests were carried out on samples produced at a voltage between 10 V and 22.5 V in 2.5 V steps. The produced coatings were subjected to an annealing process at 900 °C for 2 h in an argon protective atmosphere. Moreover, the influence of the substrate chemical composition on the chemical and phase composition of the anodic oxide are discussed. Band gaps of 2.37 eV at 22.5 V and 2.64 eV at 10 V were obtained directly after the anodizing process. After applying the heat treatment, band gap values of 2.10 eV at 22.5 Vand 2.48 eV for the coating produced at 10 V were obtained.
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