Structural refinement and morphology of synthetic akaganèite crystals, [β-FeO(OH)]

Villalba, Juan Carlo; Berezoski, Stephani; Cavicchiolli, Koema de Almeida; Galvani, Victor; Anaissi, Fauze Jacó

doi:10.1016/j.matlet.2013.04.004

Cited by 20 publications

(10 citation statements)

References 11 publications

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“…20 Akaganeite is interesting due to its structural, magnetic and catalytic properties, as well as for practical applications such as for the removal of pollutants, sorption, ion-exchange, lithium-air batteries. [22][23][24][25][26][27] Moreover, the β-FeOOH phase is important and widely used as a precursor in the 4 preparation of iron, hematite, maghemite and magnetite nanosized materials. 16,[28][29][30][31][32] Akaganeite is an antiferromagnetic material with a Néel temperature in the range of T N ≈ 240-299 K. 12,20,33 A substantial reduction of the Néel temperature, down to T N = 15 K, has been observed in amorphous β-FeOOH nanowires.…”

Section: Introductionmentioning

confidence: 99%

Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties

et al. 2015

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We report on structural and magnetic properties of uniform silica coated akaganeite nanorods with length of L ~ 80 ± 15 nm and diameter D ~ 15 ± 5 nm as well as silica shell thickness of about 5 nm. Unexpected negative difference between field-cooled (FC) and zero-field-cooled (ZFC) magnetization ∆M= M FC -M ZFC < 0, room temperature ferromagnetism and exchange bias effect have been found. The nanorods are investigated by X-ray powder diffraction (XRPD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) measurements. The magnetic measurements were also performed on bare akaganeite nanorods in order to discriminate the effects of silica coating on the magnetic properties. The measured coercivity and exchange bias effect of bare β-FeOOH nanorods are much lower compared with same properties of SiO 2 @β-FeOOH nanorods emphasizing effect of silica coating on the magnetic properties. These results are discussed considering the core-shell structure of akaganeite nanorods i.e. the inner part of the akaganeite nanorod has antiferromagnetic ordering, whereas the nanorod surface exhibits some disorder spin state.

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Section: Introductionmentioning

confidence: 99%

Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties

et al. 2015

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“…The FTIR spectra of hybrid particles with different reaction durations are shown in Figure 3 . The absorption peaks at 1087 and 699 cm −1 are attributed to the –OH stretching and Fe–O vibrational modes of β-FeOOH [ 23 , 26 , 27 ], which is benefit for the interface bonding. Compared with the FTIR spectra of pristine diamond particles, the absorption peaks of β-FeOOH gradually increased with the increasing reaction time.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, we described a novel route for preparing core/shell structured diamond/akageneite hybrid particle via one-step isothermal hydrolyzing to reduce the abrasive shedding and mechanical damage during polishing. In contrast to forced hydrolysis and other severe preparations which are always under the temperature above 90 °C [ 23 ], this isothermal hydrolyzing procedure under relatively low temperature (40 °C) is very slow and soft [ 24 , 25 ]. The formation of akageneite is prone to occur on the surface of diamond rather than in the solution.…”

Section: Introductionmentioning

confidence: 99%

The Synthesis of the Core/Shell Structured Diamond/Akageneite Hybrid Particles with Enhanced Polishing Performance

Zhang

et al. 2017

Materials

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In this study, the synthesis of the core/shell structured diamond/akageneite hybrid particles was performed through one-step isothermal hydrolyzing. The hybrid particle was characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier transform infrared spectra. The test results overall reveal that the akageneite coating, phase β-FeO(OH), was uniformly coated onto the diamond surface. The polishing performance of the pristine diamond and hybrid particles for the sapphire substrate was evaluated respectively. The experimental results show that the hybrid particles exhibited improved polishing quality and prolonged effective processing time of polishing pad compared with diamond particles without compromising the material remove rate and surface roughness. The improved polishing behavior might be attributed to the β-FeOOH coating, which is conducive to less abrasive shedding and reducing the scratch depth.

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“…If discharged directly without previous treatment, the spent pickling solutions would do great damage to environment due to their high concentrations of iron and residual acid which are hazardous. Different processes have been reported for the treatment of steel pickling waste liquid in literatures which include: neutralization/precipitation [1] ; hydrothermal method [2,3] ; spray roasting [4,5] ; spray pyrolysis [6] ; electrolytic precipitation/deposition [7,8] ; coprecipitation [9,10] ; ion exchange technique [11] ; acid pressure leaching [12] ; electro-dialysis/membrane separation [13] . There is no doubt that these approaches recover acid and metallic values respectively.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Iron Oxide Yellow from Spent Pickling Solutions

Wan

Yang

et al. 2016

MATEC Web Conf.

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Abstract.This paper demonstrates a simple environment-friendly synthesis route of iron oxide yellow (Į-FeOOH) using spent pickling solutions as raw material. After abundant laboratory experiments, we finally pinned down the best procedure. The research showed that Į-FeOOH nanometer material with average diameter of 50nm and average length of 400 nm was prepared at the optimal technique. And the FeOOH content of the sample was as high as 90%, which is higher than the 86% of GB/T1863-2008. The structure, morphology and size distribution of the product was characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), Scanning electron microscope (SEM) and Malvern lazer particle analyzer, respectively. The test results show that all the indices of as-prepared iron oxide yellow are completely in conformity with and even better than national primes standard.

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Structural refinement and morphology of synthetic akaganèite crystals, [β-FeO(OH)]

Cited by 20 publications

References 11 publications

Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties

Silica-Coated and Bare Akaganeite Nanorods: Structural and Magnetic Properties

The Synthesis of the Core/Shell Structured Diamond/Akageneite Hybrid Particles with Enhanced Polishing Performance

Synthesis of Iron Oxide Yellow from Spent Pickling Solutions

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