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Synthesis and Characterization of Hematite Nanotube Arrays …

If iron, Fe, and oxygen, O2, are in contact at high enough temperatures (and with plenty of oxygen around), the grey or reddish compound that forms is called iron(III) oxide with the formula Fe2O3 and the common name (used to identify the natural mineral on Earth and, for that matter, Mars, where its presence is a striking chemical clue to the past history of Mars) . We can write a balanced net reaction for this synthesis very simply:

Nonspherical spindle-shaped hematite/polymer hybrid nanoparticles (SPNPs) were synthesized via surface-initiated atom transfer radical polymerization (SI-ATRP). The long axis of the SPNPs was 370 ± 65 nm, and the short axis was 80 ± 15 nm with an aspect ratio of 4.6-4.7. The SPNPs were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Thermogravimetric analysis (TGA) was used to estimate the content of grafted polymer. Light-scattering measurement was used to detect the particle size distribution of SPNPs in water and in cell culture medium. HeLa cells internalized the SPNPs within 1 h, and the uptake reached equilibrium in 8 h. These observations contribute to better understanding of the interactions between nonspherical nanoparticles and cells, which may have implication for designing drug delivery vehicles.

Synthesis of Hematite (α-Fe2O3) Nanorods: Diameter …

Synthesis and Magnetic Properties of Hematite Particles …

Hydrothermal Synthesis of Hematite Nanoparticles and Their Electrochemical Properties

N2 - Nonspherical spindle-shaped hematite/polymer hybrid nanoparticles (SPNPs) were synthesized via surface-initiated atom transfer radical polymerization (SI-ATRP). The long axis of the SPNPs was 370 ± 65 nm, and the short axis was 80 ± 15 nm with an aspect ratio of 4.6-4.7. The SPNPs were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Thermogravimetric analysis (TGA) was used to estimate the content of grafted polymer. Light-scattering measurement was used to detect the particle size distribution of SPNPs in water and in cell culture medium. HeLa cells internalized the SPNPs within 1 h, and the uptake reached equilibrium in 8 h. These observations contribute to better understanding of the interactions between nonspherical nanoparticles and cells, which may have implication for designing drug delivery vehicles.

AB - Nonspherical spindle-shaped hematite/polymer hybrid nanoparticles (SPNPs) were synthesized via surface-initiated atom transfer radical polymerization (SI-ATRP). The long axis of the SPNPs was 370 ± 65 nm, and the short axis was 80 ± 15 nm with an aspect ratio of 4.6-4.7. The SPNPs were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Thermogravimetric analysis (TGA) was used to estimate the content of grafted polymer. Light-scattering measurement was used to detect the particle size distribution of SPNPs in water and in cell culture medium. HeLa cells internalized the SPNPs within 1 h, and the uptake reached equilibrium in 8 h. These observations contribute to better understanding of the interactions between nonspherical nanoparticles and cells, which may have implication for designing drug delivery vehicles.

Synthesis of artificial hematite

Top: The synthesis of hematite involves the thermal oxidation of a titanium-doped iron thin film deposited by magnetron sputtering. Bottom: Above a certain level, the concentration of titanium plays a moderate role in the enhancement of hematite's water splitting ability; doping location (on the surface of hematite) plays a more significant role, due to surface catalysis.

Hydrothermal Synthesis of Hematite Nanoparticles and Their Electrochemical Properties.

Mineralogical characterization of ash provides information on the amorphous portion of crystalline phases, making it possible to predict the ease of dissolution of Al and Si during synthesis. shows the diffractogram obtained for CFA-UB. The most important crystalline phases identified were quartz (SiO2) and mullite (3Al2O3.2SiO2), as well as small amounts of hematite (Fe2O3). These results corroborate the data reported in the literature, indicating the presence of only three crystalline phases shown in the figure.

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Synthesis of hematite and iron oxyhydroxide …


Some Wet Routes for Synthesis of Hematite | …

A–D shows images of CNT/CF observed in transmission electron microscopy (TEM) as presented in SEM images (). The images show materials with a minimum thickness of approximately 25nm, what is straightforwardly seen in C. Although a hollow morphology is not clear, nanotubes are usually associated with nanoscale dimension. It can be concluded that the method used in the synthesis allows obtaining nanocarbon materials of varying thicknesses, but finer than 50nm (A–D). Furthermore, in D, probably bundles of carbon nanotubes can also be presented, formed by single and double walled carbon nanotubes with very fine diameters. In general, it is possible to observe nanomaterials with high aspect ratio (/) which is an important feature for future applications, especially for toughness improving of materials such as polymers and construction concretes.

Synthesis of hematite nanowires using a mesoporous …

For zeolite synthesis, CFA samples collected from the electrostatic precipitator of the Presidente Médici Thermoelectric Power Plant (UTPM), in the city of Candiota (Southern Brazil), were used. The UTPM has three units (A, B and C); tests in this study were conducted using fly ash from Unit B (CFA-UB) which, given its greater combustion efficiency, generates ash with a lower level of unburned material than the other two units. The samples were dried in an oven (105 ºC, 2 h) and stored in a dry place at room temperature in opaque, colorless plastic bottles until use. Commercial zeolites 4A and Na-P1 were dried and stored in the same way of the produced zeolites. The following certified reference materials (CRMs) were used to determine chemical analyses accuracy: Coal Fly Ash-SRM 2690; Zeolite Y-RM 8850; Zeolite A-RM 8851 from the NIST (National Institute of Standards and Technology) in Gaithersburg, Maryland.

Facile low-temperature synthesis of hematite quantum …

CFN Capabilities: CFN’s Materials Synthesis and Characterization Facility was used for the preparation and photocatalytic study of the hematite films. Their structural characterization was done at the Electron Microscopy Facility.

Synthesis of hematite α-Fe2O3 nanospheres for lithium …

As commented previously, the characterization of zeolites in terms of trace elements is relatively unexplored in the literature., Most studies, investigate only the main components (Al, Na and Si) of zeolite structure, with only a few,, also characterizing majority elements. The presence of trace elements in zeolites obtained from CFA is even more unusual and only two studies were found., In one of these studies, the authors used fly ash from two Italian power plants in conventional hydrothermal synthesis at low temperatures (25 to 60 °C). Mixtures of zeolites (type X, sodalite and ZK-5), geopolymers and unreacted ash were obtained. Twelve trace elements were quantified in the zeolites, with high concentrations of Ni, Cr, Pb, Cu and Co (200-50 mg kg-1). Direct comparisons between these products and the produced zeolites in the present study should be made with caution given the differences in synthesis processes and the composition of ash used. However, the produced zeolite Na-P1 (obtained in our study) exhibits characteristics similar to those observed by the aforementioned authors, with similar or lower levels for most of the elements assessed (). It is important to underscore that As levels (7-13 mg kg-1) obtained by Belviso et al. were also significant in the zeolite products when compared to produced zeolite 4A (44 mg kg-1).

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