Facile preparation of carbon coated magnetic Fe3O4 particles by a combined reduction/CVD process

Tristão, Juliana Cristina; Oliveira, Aline Silva de; Ardisson, José D.; Dias, Anderson; Lago, Rochel M.

doi:10.1016/j.materresbull.2011.01.008

Cited by 29 publications

(21 citation statements)

References 34 publications

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“…39 The combined reduction/CVD process using methane and hematite is a versatile, technically simple and low cost method to produce carbon coated Fe 3 O 4 particles. 40,41 In this process, methane reduces Fe 2 O 3 with very good selectivity to Fe 3 O 4 magnetic nuclei and leads to an amorphous carbon deposition by a CVD reaction (Figure 10). …”

Section: Magnetic Nanostructured Composites Based On Carbon Coated Irmentioning

confidence: 99%

“…These magnetic coated particles were used as adsorbent of organic compounds, e.g., methylene blue and chlorobenzene, and for the production of a magnetic recyclable supported Pd catalyst, as hydrogenation reactions (Figure 12). [40][41][42][43] An innovative approach to produce magnetic nanoparticles based on iron cores encapsulated by a high surface area carbon was produced using Fe 3+ ions and sucrose as a carbon source and reducing agent. In this process, first Fe 3+ ions are solubilized in aqueous sucrose and upon thermal decomposition the iron is reduced to form magnetic particles surrounded by a nanometric layer of more organized graphitic carbon entrapped in an amorphous carbonaceous matrix ( Figure 13).…”

Section: Magnetic Nanostructured Composites Based On Carbon Coated Irmentioning

confidence: 99%

See 1 more Smart Citation

Iron: a versatile element to produce materials for environmental applications

Teixeira¹,

Tristão²,

Araújo³

et al. 2012

J. Braz. Chem. Soc.

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Ferro é um elemento versátil que forma várias fases com diferentes estados de oxidação e estruturas, tais como Fe 0 , FeO, Fe 3 O 4 , γ-Fe 2 O 3 , α-Fe 2 O 3 e FeOOH. Todas estas fases têm propriedades físico-químicas únicas que podem ser usadas para diferentes aplicações. Neste trabalho, descreve-se o uso de diferentes compostos de ferro, sintéticos e também naturais ou de rejeitos, em aplicações ambientais e tecnológicas. Duas áreas principais de pesquisa são descritas. A primeira é relacionada às estratégias para aumentar a reatividade de fases de ferro pela formação de compósitos Fe 0 /Fe óxido e pela introdução de novos metais na estrutura de óxidos de ferro para promover novas reações superficiais. A segunda área de pesquisa é o uso das propriedades magnéticas de algumas fases de ferro para produzir materiais magnéticos versáteis com aplicações focadas em adsorção, catálise e emulsões.Iron is a versatile element forming several phases with different oxidation states and structures, such as Fe 0 , FeO, Fe 3 O 4 , γ-Fe 2 O 3 , α-Fe 2 O 3 and FeOOH. All these phases have unique physicochemical properties which can be used for different applications. In this work, it is described the use of different iron compounds, synthetic and also from natural and waste sources, in environmental and technological applications. Two main research areas are described. The first one is related to strategies to increase the reactivity of Fe phases, mainly by the formation of Fe 0 /iron oxide composites and by the introduction of new metals in the iron oxide structure to promote new surface reactions. The second area is the use of the magnetic properties of some iron phases to produce versatile magnetic materials with focus in adsorption, catalysis and emulsions.

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Section: Magnetic Nanostructured Composites Based On Carbon Coated Irmentioning

confidence: 99%

Section: Magnetic Nanostructured Composites Based On Carbon Coated Irmentioning

confidence: 99%

Iron: a versatile element to produce materials for environmental applications

Teixeira¹,

Tristão²,

Araújo³

et al. 2012

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

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“…Chemical vapor deposition (CVD) is an alternative method for preparing carbon coated iron oxide composites. Acetylene (C 2 H 2 ) [26e29], methane (CH 4 ) [30] and toluene (C 7 H 8 ) [6] have been reported as carbon sources in the preparation of carbon coated iron oxides (Fe 3 O 4 @C and Fe 2 O 3 @C) by CVD. The deposition periods of the CVD method are mostly in the range of several minutes to several tens minutes [6,26e29], which are extremely short compared with those of the pyrolysis ones.…”

Section: Introductionmentioning

confidence: 99%

Chemical vapor deposition prepared bi-morphological carbon-coated Fe3O4 composites as anode materials for lithium-ion batteries

Wang

Gao

Wang

et al. 2015

Journal of Power Sources

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“…This is because of their potential applications in various cutting-edge fields such as the use as magnetic recording media, magnetic toners in xerography, contrast agents in magnetic resonance imaging, and nanocarriers for drug delivery and photothermal therapy. [1][2][3][4] To date, several methods have been developed for synthesizing carbon-encapsulated magnetic nanoparticles, including chemical vapor deposition, 5 arc discharge, 6 spray pyrolysis, 7 plasma methods, 8 and one-pot synthesis in closed cells. 9 The resulting nanocomposites are composed of a magnetic core of nanoparticles encapsulated in a graphitic carbon layer; and they have demonstrated unique physicochemical properties including a large surface area, high electrical and thermal conductivity, and high mechanical strength owing to the inherited characteristics of graphitic carbon.…”

Section: Introductionmentioning

confidence: 99%

Necrotic cell death caused by exposure to graphitic carbon‐coated magnetic nanoparticles

Kim

Sanetuntikul

Shanmugam

et al. 2015

J Biomedical Materials Res

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We synthesized graphitic carbon-coated magnetic nanoparticles (Fe@C NPs) and evaluated their physicochemical properties and mechanism of cytotoxicity in vitro. The structure of these nanocomposites consisted of an iron core encapsulated by a graphitic-carbon shell. The diameter of these Fe@C NPs was 81 ± 14 nm, and the thickness of the carbon layer encapsulating the core was 7.0 ± 0.5 nm. Inhibition of cell proliferation was induced by exposure to Fe@C NPs at doses above 50 μg mL(-1) . The exposed cells did not show increased activation of apoptosis biomarkers such as PARP, caspase-3, caspase-7, and caspase-9, and apoptosis-specific responses such as DNA laddering and annexin V binding to the cell membranes. In addition, the expression levels of autophagy-specific biomarkers such as ATG5 and LC3 after exposure were not enhanced, either. Instead, we observed increased release of lactate dehydrogenase in the culture media and red-fluorescent cell cytosol stained with ethidium homodimer I after the exposure. These results indicated enhanced cell membrane permeability after exposure to Fe@C NPs, probably caused by necrosis. The analysis of the regulatory molecules of cell cycling and proliferation, ERK, p53, and AKT, implied that cell cycle arrest was initiated and the cells were sensitized to necrosis. This necrotic cell death was also observed in carbon shells from Fe@C NPs obtained by removing the metal core. In conclusion, the graphitic carbon-encapsulated magnetic nanoparticles synthesized by one-pot synthesis induced necrotic cell death to human HEK293 cells, which was caused by graphitic carbon surface encapsulating the metal core.

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Facile preparation of carbon coated magnetic Fe3O4 particles by a combined reduction/CVD process

Cited by 29 publications

References 34 publications

Iron: a versatile element to produce materials for environmental applications

Iron: a versatile element to produce materials for environmental applications

Chemical vapor deposition prepared bi-morphological carbon-coated Fe3O4 composites as anode materials for lithium-ion batteries

Necrotic cell death caused by exposure to graphitic carbon‐coated magnetic nanoparticles

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