Effect of precursor on the formation of different phases of iron oxide nanoparticles

Kumar, Deepak; Singh, Haridwar; Jouen, Samuel; Hannoyer, B.; Banerjee, Shaibal

doi:10.1039/c4ra10241j

Cited by 25 publications

(17 citation statements)

References 43 publications

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“…In 3 and 4, the peaks at ca. 1400 cm −1 can be associated to iron oxyhydroxide [17], while the bands at 1229, 1140, 998, and 626 cm −1 are related to the S=O group [18,19]. These results relate well with the data obtained by thermogravimetric analysis ( Figure S4), where elimination of the coordinated water and hydroxy groups can be observed at 100-300 • C while the S=O group decomposition occurs at 500-700 • C.…”

Section: Characterization Of the Dispersed Materialssupporting

confidence: 86%

“…The catalytic system 3 appears to be the one that preferably responds to ultrasound activation (Table 4, entries [11][12][13][14][15]. Finally, the catalyst 4 responds equally to all three types of activating inputs (Table 4, entries [16][17][18][19][20]. For comparative purpose, oxidation of 1-phenylethanol to acetophenone was also performed by mechanochemical treatment (500 rpm, 10 spheres of 10 mm diameter, with rotational inversions every 5 min) in the presence of 1-4, at room temperature (Table 4, entries 5, 10, 15, and 20).…”

Section: Effect Of the Energy Inputmentioning

confidence: 99%

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Ultrasound and Radiation-Induced Catalytic Oxidation of 1-Phenylethanol to Acetophenone with Iron-Containing Particulate Catalysts

et al. 2020

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Iron-containing particulate catalysts of 0.1–1 µm size were prepared by wet and ball-milling procedures from common salts and characterized by FTIR, TGA, UV-Vis, PXRD, FEG-SEM, and XPS analyses. It was found that when the wet method was used, semi-spherical magnetic nanoparticles were formed, whereas the mechanochemical method resulted in the formation of nonmagnetic microscale needles and rectangles. Catalytic activity of the prepared materials in the oxidation of 1-phenylethanol to acetophenone was assessed under conventional heating, microwave (MW) irradiation, ultrasound (US), and oscillating magnetic field of high frequency (induction heating). In general, the catalysts obtained by wet methods exhibit lower activities, whereas the materials prepared by ball milling afford better acetophenone yields (up to 83%). A significant increase in yield (up to 4 times) was observed under the induction heating if compared to conventional heating. The study demonstrated that MW, US irradiations, and induction heating may have great potential as alternative ways to activate the catalytic system for alcohol oxidation. The possibility of the synthesized material to be magnetically recoverable has been also verified.

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Section: Characterization Of the Dispersed Materialssupporting

confidence: 86%

Section: Effect Of the Energy Inputmentioning

confidence: 99%

Ultrasound and Radiation-Induced Catalytic Oxidation of 1-Phenylethanol to Acetophenone with Iron-Containing Particulate Catalysts

et al. 2020

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“…Kumar et al also elucidated the effects of precursors in the formation of different forms of iron oxide and oxyhydroxide by using trioctylamine as the reducing agent in a coprecipitation process. [71] Their results showed that the constitution, shape, size, and properties of phases significantly changed by changing the cations. Topel el al.…”

Section: Coprecipitationmentioning

confidence: 99%

Synthesis, Functionalization, and Design of Magnetic Nanoparticles for Theranostic Applications

Mosayebi

Kiyasatfar

Laurent

2017

Adv Healthcare Materials

203

171

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In order to translate nanotechnology into medical practice, magnetic nanoparticles (MNPs) have been presented as a class of non‐invasive nanomaterials for numerous biomedical applications. In particular, MNPs have opened a door for simultaneous diagnosis and brisk treatment of diseases in the form of theranostic agents. This review highlights the recent advances in preparation and utilization of MNPs from the synthesis and functionalization steps to the final design consideration in evading the body immune system for therapeutic and diagnostic applications with addressing the most recent examples of the literature in each section. This study provides a conceptual framework of a wide range of synthetic routes classified mainly as wet chemistry, state‐of‐the‐art microfluidic reactors, and biogenic routes, along with the most popular coating materials to stabilize resultant MNPs. Additionally, key aspects of prolonging the half‐life of MNPs via overcoming the sequential biological barriers are covered through unraveling the biophysical interactions at the bio–nano interface and giving a set of criteria to efficiently modulate MNPs' physicochemical properties. Furthermore, concepts of passive and active targeting for successful cell internalization, by respectively exploiting the unique properties of cancers and novel targeting ligands are described in detail. Finally, this study extensively covers the recent developments in magnetic drug targeting and hyperthermia as therapeutic applications of MNPs. In addition, multi‐modal imaging via fusion of magnetic resonance imaging, and also innovative magnetic particle imaging with other imaging techniques for early diagnosis of diseases are extensively provided.

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“…Different procedures have been developed for the preparation of IONPs, either by physical, chemical, or biological pathways, each with their advantages and disadvantages [57]. Physical procedures consist of gas phase deposition, electron-beam lithography, pulse laser ablation, laser-induced pyrolysis, powder ball milling, and aerosol [58,59].…”

Section: Synthetic Pathways To Ionpsmentioning

confidence: 99%

“…For IONPs, specific bacteria-magnetotactic bacteria and iron reducing bacteria-are used [3]. The main chemical methods are coprecipitation, solvothermal, hydrothermal, microwave irradiation, thermal decomposition, sonochemical, inverse microemulsion, sol-gel synthesis, flow injection, and electrospray synthesis [57,[59][60][61]. One of the most common methods to prepare IONPs is the coprecipitation of Fe +2 and Fe 3+ precursors in strong alkaline medium.…”

Section: Synthetic Pathways To Ionpsmentioning

confidence: 99%

Nanomaterials Developed by Processing Iron Coordination Compounds for Biomedical Application

Iacob¹,

Racleş²,

Dascălu³

et al. 2019

Journal of Nanomaterials

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The iron oxides, widespread in nature, are used in numerous applications in practice due to their well-known properties. These properties can be modified by size lowering at nanoscale. Some applications, such as biomedical, require a rigorous selection of nanoparticles by size, shape, and surface functionality. In other applications, such as catalysis or magnetism, the composition (generally mixed oxides) and morphology of the nanoparticles are of high importance. The preparation of iron oxide nanoparticles (IONPs) is a complex process whose control raises a number of issues. The first challenge is finding the optimal experimental conditions, which would lead to the preparation of monodisperse nanoparticles. Another issue is the selection or setting a reproducible and clean manufacturing process without a need of complex purification. Even though at the moment several methods for preparing IONPs are known, there are still concerns in the scientific world to further improve existing methods or create new protocols. Therefore, the establishment of optimal methods for preparing IONPs with predetermined structural, dimensional, and morphological characteristics is an important task of scientists. Most of the methods reported in literature for the preparation of IONPs use proper metal salts as precursors. Recently, the use of the organometallic and coordination compounds of iron as precursors for IONPs has emerged as an alternative for a better control of these. Here, achievements reported in the literature in this direction are reviewed and critically analysed in relation to the conventional method based on iron salts.

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Effect of precursor on the formation of different phases of iron oxide nanoparticles

Abstract: Trioctylamine is known to act simultaneously as a reducing as well as a hydrolyzing agent.

Cited by 25 publications

References 43 publications

Ultrasound and Radiation-Induced Catalytic Oxidation of 1-Phenylethanol to Acetophenone with Iron-Containing Particulate Catalysts

Ultrasound and Radiation-Induced Catalytic Oxidation of 1-Phenylethanol to Acetophenone with Iron-Containing Particulate Catalysts

Synthesis, Functionalization, and Design of Magnetic Nanoparticles for Theranostic Applications

Nanomaterials Developed by Processing Iron Coordination Compounds for Biomedical Application

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