Polymorphous Transformations of Nanometric Iron(III) Oxide: A Review

Machala, Libor; Tuček, Jiří; Zbořil, Radek

doi:10.1021/cm200397g

Cited by 457 publications

(407 citation statements)

References 158 publications

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“…Relatively sharp diffraction lines indicate fair crystallinity of the sample, which is proved in a mean Xray coherence length (MCL) equal to 32 nm. Although the cell parameter is slightly higher (a = 8.403 Å) than that previously reported in literature [13], no cation substitutions are presented.…”

Section: Characterization Of Initial -Fe 2 O 3 Samplecontrasting

confidence: 67%

“…The main aim of this work is to investigate a thermally induced transformation process of -Fe 2 O 3 phase not merely in an oxidative ambient atmosphere (i.e., synthetic air) as has been explored earlier [13], but also in various inert atmospheres, including nitrogen (N 2 ) and carbon dioxide (CO 2 ). To the best of our knowledge, such a study has never been performed yet.…”

Section: Introductionmentioning

confidence: 99%

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Thermally-induced solid state transformation of β‐Fe2O3 nanoparticles in various atmospheres

Malina¹,

Kašlík²,

Čuda³

et al. 2014

AIP Conference Proceedings

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Section: Characterization Of Initial -Fe 2 O 3 Samplecontrasting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Thermally-induced solid state transformation of β‐Fe2O3 nanoparticles in various atmospheres

Malina¹,

Kašlík²,

Čuda³

et al. 2014

AIP Conference Proceedings

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“…Hematite is the most stable phase of iron oxide, whereas maghemite is metastable and readily transforms to hematite. In nature, both hematite and maghemite can be found in minerals as well as in nanoparticle form, but it is generally accepted that a nanoparticle sizedependent transition from maghemite to hematite occurs around 10 nm 43 . Furthermore, the stabilization of maghemite nanoparticles has been observed at maghemite silica-based supports 44 .…”

Section: Resultsmentioning

confidence: 99%

Formation of nitrogen-doped graphene nanoscrolls by adsorption of magnetic γ-Fe2O3 nanoparticles

et al. 2013

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Graphene nanoscrolls are Archimedean-type spirals formed by rolling single-layer graphene sheets. Their unique structure makes them conceptually interesting and understanding their formation gives important information on the manipulation and characteristics of various carbon nanostructures. Here we report a 100% efficient process to transform nitrogen-doped reduced graphene oxide sheets into homogeneous nanoscrolls by decoration with magnetic g-Fe 2 O 3 nanoparticles. Through a large number of control experiments, magnetic characterization of the decorated nanoparticles, and ab initio calculations, we conclude that the rolling is initiated by the strong adsorption of maghemite nanoparticles at nitrogen defects in the graphene lattice and their mutual magnetic interaction. The nanoscroll formation is fully reversible and upon removal of the maghemite nanoparticles, the nanoscrolls return to open sheets. Besides supplying information on the rolling mechanism of graphene nanoscrolls, our results also provide important information on the stabilization of iron oxide nanoparticles.

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“…Superparamagnetism is a thermally activated relaxation phenomenon that is typically observed in nanoscale structures, in which the particle's overall magnetic moment (i.e., superspin) spontaneously fluctuates between various orientations that are energetically favored by its magnetic (magnetocrystalline in most cases) anisotropy. Nanosized γ-Fe 2 O 3 is a very useful material in nanotechnological applications because its nanoparticles have interesting magnetic and surface properties and it is nontoxic, biodegradable, biocompatible, and chemically stable 5 It is really important to get monodispersity during the fabrication of the nanoparticles to increase the sensitivity of these particles for the diverse applications. Hence, the development of novel methods has been the focus of recent research to make uniform and highly monodispersed nanoparticles by the wet chemical method, 6,7 and the thermal decomposition method.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Characterization of Maghemite (γ-Fe2O3) Nanoparticles and Its Cytotoxicity Studies

Khodabakhshi¹,

Bahari²

2017

IJPER

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Objective: The expansion of wet chemical method for the synthesis of iron oxide nanoparticles with magnetic properties is reported. Methods: Iron oxide nanoparticles were investigated in the procedure using Transmission Electron Microscopy (TEM). It has been seen that the distribution size changed by changing of Molarity precursor and heating the sample. The magnetization evaluations were performed using a Vibrating Sample Magnetometer device (VSM) to specify the magnetic answer. The Thermo Gravimetric Analyses (TGA) displayed the size-dependent weight loss of the magnetic nanoparticles. In this work, the cytotoxic activity of various samples of Maghemite on cancer cell lines HELA was studied. The in vitro cytotoxicity tests were also performed to determine the cell viability as a work of size and heat of the magnetic nanoparticles. Results: The samples c and d at T=300°C had a little magnetic hysteresis that can use in cancer cure with hyperthermia therapy method. Conclusions: These samples became amorphous and they were nontoxicity.

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Polymorphous Transformations of Nanometric Iron(III) Oxide: A Review

Cited by 457 publications

References 158 publications

Thermally-induced solid state transformation of β‐Fe2O3 nanoparticles in various atmospheres

Thermally-induced solid state transformation of β‐Fe2O3 nanoparticles in various atmospheres

Formation of nitrogen-doped graphene nanoscrolls by adsorption of magnetic γ-Fe2O3 nanoparticles

Investigation and Characterization of Maghemite (γ-Fe2O3) Nanoparticles and Its Cytotoxicity Studies

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