Mechanochemical Synthesis and Characterization of Molybdenum Dioxide-Hematite Nanostructures with Different Molarities

Knauss, Matthew; Ţolea, Felicia; Văleanu, M.; Diamandescu, L.; Trotta, Richard; Wood, Kelly E.; Grabias, A.; Sorescu, Monica

doi:10.4236/jmmce.2018.66042

Cited by 4 publications

(5 citation statements)

References 16 publications

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“…The XRD patterns of the equimolar mixture MoO 2 + α-Fe 2 O 3 , corresponding to 2 h and respectively 8 h milling times, are presented in Figure 1 . Similar to results reported in [ 23 , 24 ], one can notice a decrease of the diffraction peak intensities for both Fe 2 O 3 and MoO 2 phases with the increase of the ball-milling time.…”

Section: Resultssupporting

confidence: 88%

“…Before introducing the powders in the ball-milling chamber, the powders were manually ground in air to obtain a homogeneous mixture (the 0 h sample). MoO 2 -Fe 2 O 3 nanoparticle systems were successfully synthesized by mechano-chemical activation through ball-milling of MoO 2 and α-Fe 2 O 3 equimolar mixtures for 2, 4, 8, and 12 h of ball-milling time [ 23 , 24 ]…”

Section: Methodsmentioning

confidence: 99%

“…It is worth mentioning that this paper continues a series of reports on molybdenum dioxide-hematite nano-systems with different molarities [ 23 , 24 ], this time with the focus being on the observation and the explanation of the unidirectional anisotropy phenomena and related effects in the equimolar nanocomposite systems.…”

Section: Introductionmentioning

confidence: 95%

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Unidirectional Magnetic Anisotropy in Molybdenum Dioxide–Hematite Mixed-Oxide Nanostructures

et al. 2022

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MoO2-Fe2O3 nanoparticle systems were successfully synthesized by mechanochemical activation of MoO2 and α-Fe2O3 equimolar mixtures throughout 0–12 h of ball-milling. The role of the long-range ferromagnetism of MoO2 on a fraction of more defect hematite nanoparticles supporting a defect antiferromagnetic phase down to the lowest temperatures was investigated in this work. The structure and the size evolution of the nanoparticles were investigated by X-ray diffraction, whereas the magnetic properties were investigated by SQUID magnetometry. The local electronic structure and the specific phase evolution in the analyzed system versus the milling time were investigated by temperature-dependent Mӧssbauer spectroscopy. The substantially shifted magnetic hysteresis loops were interpreted in terms of the unidirectional anisotropy induced by pinning the long-range ferromagnetic order of the local net magnetic moments in the defect antiferromagnetic phase, as mediated by the diluted magnetic oxide phase of MoO2, to those less defect hematite nanoparticles supporting Morin transition. The specific evolutions of the exchange bias and of the coercive field versus temperature in the samples were interpreted in the frame of the specific phase evolution pointed out by Mӧssbauer spectroscopy. Depending on the milling time, a different fraction of defect hematite nanoparticles is formed. Less nanoparticles supporting the Morin transition are formed for samples exposed to a longer milling time, with a direct influence on the induced unidirectional anisotropy and related effects.

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Section: Resultssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

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Unidirectional Magnetic Anisotropy in Molybdenum Dioxide–Hematite Mixed-Oxide Nanostructures

et al. 2022

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“…Powell, et al [ 233 ] utilized IONPs for the treatment of treated wastewater in underflow situations via a magnetic nanoparticle device (MagNERD). The method employs superparamagnetic magnetite that was created, collected, and isolated from improved MagNERD.…”

Section: Applications Of Synthesized Iron Oxide Nanoparticlesmentioning

confidence: 99%

A narrative review of the synthesis, characterization, and applications of iron oxide nanoparticles

Ogbezode,

Ezealigo,

Bello

et al. 2023

Discover Nano

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The significance of green synthesized nanomaterials with a uniform shape, reduced sizes, superior mechanical capabilities, phase microstructure, magnetic behavior, and superior performance cannot be overemphasized. Iron oxide nanoparticles (IONPs) are found within the size range of 1–100 nm in nanomaterials and have a diverse range of applications in fields such as biomedicine, wastewater purification, and environmental remediation. Nevertheless, the understanding of their fundamental material composition, chemical reactions, toxicological properties, and research methodologies is constrained and extensively elucidated during their practical implementation. The importance of producing IONPs using advanced nanofabrication techniques that exhibit strong potential for disease therapy, microbial pathogen control, and elimination of cancer cells is underscored by the adoption of the green synthesis approach. These IONPs can serve as viable alternatives for soil remediation and the elimination of environmental contaminants. Therefore, this paper presents a comprehensive analysis of the research conducted on different types of IONPs and IONP composite-based materials. It examines the synthesis methods and characterization techniques employed in these studies and also addresses the obstacles encountered in prior investigations with comparable objectives. A green engineering strategy was proposed for the synthesis, characterization, and application of IONPs and their composites with reduced environmental impact. Additionally, the influence of their phase structure, magnetic properties, biocompatibility, toxicity, milling time, nanoparticle size, and shape was also discussed. The study proposes the use of biological and physicochemical methods as a more viable alternative nanofabrication strategy that can mitigate the limitations imposed by the conventional methods of IONP synthesis.

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“…Different metal oxide nanocomposites, such as CeO 2 ‐MnO x , CuO‐ZnO, SnO 2 ‐ZnO, have been fabricated relying on various methods, solution‐based mostly [142, 143] . The mechanochemical route offers a solvent‐free alternative for these systems and has been described for the preparation of SnO 2 ‐ZnO, [144] Fe 2 O 3 ‐TiO 2 , [145, 146] Cu x O‐TiO 2 , [147] MoO 2 ‐Fe 2 O 3 , [148, 149] CuO‐CeO 2 [150, 151] …”

Section: Mixed Oxides and Nanocomposite Catalystsmentioning

confidence: 99%

Mechanochemical Synthesis of Catalytic Materials

Amrute

Bellis

Felderhoff

et al. 2021

Chemistry A European J

177

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The mechanochemical synthesis of nanomaterials for catalytic applications is a growing research field due to its simplicity, scalability, and eco‐friendliness. Besides, it provides materials with distinct features, such as nanocrystallinity, high defect concentration, and close interaction of the components in a system, which are, in most cases, unattainable by conventional routes. Consequently, this research field has recently become highly popular, particularly for the preparation of catalytic materials for various applications, ranging from chemical production over energy conversion catalysis to environmental protection. In this Review, recent studies on mechanochemistry for the synthesis of catalytic materials are discussed. Emphasis is placed on the straightforwardness of the mechanochemical route—in contrast to more conventional synthesis—in fabricating the materials, which otherwise often require harsh conditions. Distinct material properties achieved by mechanochemistry are related to their improved catalytic performance.

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Mechanochemical Synthesis and Characterization of Molybdenum Dioxide-Hematite Nanostructures with Different Molarities

Cited by 4 publications

References 16 publications

Unidirectional Magnetic Anisotropy in Molybdenum Dioxide–Hematite Mixed-Oxide Nanostructures

Unidirectional Magnetic Anisotropy in Molybdenum Dioxide–Hematite Mixed-Oxide Nanostructures

A narrative review of the synthesis, characterization, and applications of iron oxide nanoparticles

Mechanochemical Synthesis of Catalytic Materials

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