Sistema RTP: uma técnica poderosa para o monitoramento da formação de nanotubos de carbono durante o processo por deposição de vapor químico

Tristão, Juliana Cristina; Moura, Flávia C.C.; Lago, Rochel M.; Sapag, Karim

doi:10.1590/s0100-40422010000600028

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…The range in which the reduction of metals was observed complies with that observed for FeCo alloy, also obtained by proteic Sol-Gel method [15]. Importantly, the literature reports different reduction temperatures for iron and the nickel, for example, nickel ferrite and catalysts containing nickel with support interactions [2,[26][27][28]. In this sense, the coexistence of FeNi alloy and oxides at temperatures around 500 ∘ C is considered, while the pure alloy can only be obtained at temperatures above 650 ∘ C. This result is clearly heavily dependent on the flow used in the reduction process.…”

Section: Resultssupporting

confidence: 77%

Synthesis of FeNi Alloy Nanomaterials by Proteic Sol-Gel Method: Crystallographic, Morphological, and Magnetic Properties

Santos

Martins

Costa

et al. 2016

Journal of Nanomaterials

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Proteic Sol-Gel method was used for the synthesis of FeNi alloy at different temperature conditions and flow reduction. The solids were characterized by XRD, H2-TPR, SEM, TEM, Mössbauer spectroscopy, and VSM. It was observed by X-ray diffraction pure FeNi alloy in the samples reduced at 600°C (40 mL/min H2 flow) and 700°C (25 mL/min H2 flow). The FeNi alloy presented stability against the oxidizing atmosphere up to 250°C. The morphology exhibited agglomerates relatively spherical and particles in the range of 10–40 nm. Mössbauer spectroscopy showed the presence of disordered ferromagnetic FeNi alloy, and magnetic hysteresis loop revealed a typical behavior of soft magnetic material.

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Section: Resultssupporting

confidence: 77%

Synthesis of FeNi Alloy Nanomaterials by Proteic Sol-Gel Method: Crystallographic, Morphological, and Magnetic Properties

Santos

Martins

Costa

et al. 2016

Journal of Nanomaterials

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“…1586 The control of the type and amount of carbon formed is important for the different envisaged applications of the composites. Our group has reported works using different ceramic matrices, such as alumina, 51 39,52 Microparticles of magnetic amphiphilic composites were produced from the clay vermiculite. The lamellar clay mineral was first fragmented to form microsheet fragments.…”

Section: Iron: a Versatile Element To Produce Materials For Environmementioning

confidence: 99%

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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“…The BET surface area decreases from 17 m 2 g À1 for pure hematite (Ht) to 0.2-6.0 m 2 g À1 after methane TPRe (Table 1). TPCVD (Temperature Programmed Chemical Vapor Deposition) [35] experiments (Supplementary Material) clearly showed the formation of H 2 at temperatures higher than ca. 700 8C which is related to carbon deposition according to the simplified Eq.…”

Section: Reaction Of Fe 2 O 3 With Methanementioning

confidence: 99%

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

Tristão

Oliveira

Ardisson

et al. 2011

Materials Research Bulletin

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Sistema RTP: uma técnica poderosa para o monitoramento da formação de nanotubos de carbono durante o processo por deposição de vapor químico

Cited by 7 publications

References 8 publications

Synthesis of FeNi Alloy Nanomaterials by Proteic Sol-Gel Method: Crystallographic, Morphological, and Magnetic Properties

Synthesis of FeNi Alloy Nanomaterials by Proteic Sol-Gel Method: Crystallographic, Morphological, and Magnetic Properties

Iron: a versatile element to produce materials for environmental applications

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

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