Hydrothermal synthesis of α-Fe2O3 nanorings with the help of divalent metal cations, Mn2+, Cu2+, Zn2+ and Ni2+

Gotić, Marijan; Dražić, Goran; Musić, Svetozar

doi:10.1016/j.molstruc.2010.12.063

Cited by 43 publications

(13 citation statements)

References 31 publications

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“…The present model is not limited to two phases structures as there could be microstructures with different pigments types. Nanoparticles of pigments like hematite can show a broad variety of different shapes, depending on their fabrication conditions: pseudocubic particles [22], porous nanorods [29], nano-ellipsoid pigments [28], hollow spindle particles [15], nanorings [4]. Hierarchical structures can be obtained, such as flower-like aggregates [5] or core/shell particles [14].…”

Section: Introductionmentioning

confidence: 99%

Optical properties of deposit models for paints: full-fields FFT computations and representative volume element

Azzimonti

Willot

Jeulin

2013

Journal of Modern Optics

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International audienceA 3D model of microstructure containing spherical and rhombi-shaped inclusions "falling" along a deposit direction is used to simulate the distribution of nanoscale color pigments in paints. The microstructures anisotropy and length scales, characterized by their covariance functions and representative volume element, follow that of transerseley isotropic or orthotropic media. Full-field computations by means of the fast Fourier method are undertaken to compute the local and effective permittivity function of the mixture, as a function of the wavelength in the visible spectrum. Transverse isotropy is numerically recovered for the effective permittivity of the deposit model of spheres. Furthermore, in the complex plane, the transverse and parallel components of the effective permittivity tensor are very close to the frontiers of the Hashin-Shtrikman's domain, at all frequencies (or color) of the incident wave. The representative volume element for the optical properties of paint deposit models are studied. At fixed accuracy, it is much larger for the imaginary part of the permittivity than for the real part, an effect of the strong variations of the electric displacement field, exhibiting hot-spots, a feature previously described in the context of conductivity

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Section: Introductionmentioning

confidence: 99%

Optical properties of deposit models for paints: full-fields FFT computations and representative volume element

Azzimonti

Willot

Jeulin

2013

Journal of Modern Optics

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“…In addition, CoOOH is non-stoichiometric and the Co is at a higher oxidation state (+3) than in Co 3 O 4 (the oxidation states are +4,+3,+2 and the average is +8/3)1415. Usually the synthesis process for cobalt/ion hydrates contains a microwave irradiation/ultrasonic chiseling pre-treatment and a high temperature (140 o C–230 o C) post-hydrothermal reaction for few hours161718 with low yield19. Cobalt hydroxide nanorings have been reported with polycrystalline structure after 10 h in a sealed autoclave at 180 o C20.…”

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confidence: 99%

Enhancing capacitance behaviour of CoOOH nanostructures using transition metal dopants by ambient oxidation

Chen

Zhou

Maguire

et al. 2016

Sci Rep

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Cobalt hydrate and doped binary Co0.9M0.1OOH (M = Ni, Mn, Fe) nanorings of 100–300 nm were fabricated in solution through a facile ambient oxidation method. A transformation from Co0.9Ni0.1(OH)2 nanodiscs to hollow Co0.9Ni0.1OOH nanorings was observed with prolonged reaction time. Core-shell nanodiscs have elemental segregation with a Co(OH)2 core and Ni(OH)2 shell. Co0.9Ni0.1OOH nanorings displayed a higher electrochemical capacitance than Mn and Fe doped nanorings materials or materials with disc-like geometries.

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“…Structure and composition of Fe 2 O 3 and thermite were characterized using EDS, XRD, and FTIR techniques. The results [29] show that the three prepared iron oxides are Fe 2 O 3 with a stoichiometric ratio of O:Fe (3:2), because their typical XRD patterns coincided with JCPDS: 33-0664, and the hematite lattice vibration is identified at 480 and 571 cm -l [33]. The EDS data show that the thermite samples contain Al element.…”

Section: Structure and Compositionmentioning

confidence: 71%

Combustion Catalyst: Nano‐Fe2O3 and Nano‐Thermite Al/ Fe2O3 with Different Shapes

Zhao¹,

Li²,

Zhao³

et al. 2016

Developments in Combustion Technology

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In order to enable the energetic materials to possess a more powerful performance, adding combustion catalysts is a quite effective method. Granular, oval, and polyhedral Fe 2 O 3 particles have been prepared by the hydrothermal method and used to fabricate Al/Fe 2 O 3 thermites. All the Fe 2 O 3 and Al/Fe 2 O 3 thermite samples were characterized using a combination of experimental techniques including scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), and high-resolution TEM (HRTEM). The non-isothermal decomposition kinetics of the composites and nitrocellulose (NC) can be modeled by the Avrami-Erofeev equation f(α)=3(1-α)[-ln(1-α)] 1/3 /2 in differential form. Through the thermogravimetric analysis infrared (TG-IR) analysis of decomposition processes and products, it is speculated that Fe 2 O 3 and Al/Fe 2 O 3 can effectively accelerate the thermal decomposition reaction rate of NC by promoting the O-NO 2 bond cleavage. Adding oxides or thermites can distinctly increase the burning rate, decrease the burning rate pressure exponent, increase the flame temperature, and improve the combustion wave structures of the ammonium perchlorate/hydroxyl-terminated polybutadiene (AP/HTPB) propellants. Among the three studied, different shapes of Fe 2 O 3 , the granular Fe 2 O 3 , and its corresponding thermites (Al/Fe 2 O 3 (H)) exhibit the highest burning rate due to larger surface area associated with smaller particle size. Moreover, Al/Fe 2 O 3 (H) thermites have more effective combustion-supporting ability for AP/HTPB propellants than Fe 2 O 3 structures and the other two as-prepared Al/Fe 2 O 3 thermites.

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Hydrothermal synthesis of α-Fe2O3 nanorings with the help of divalent metal cations, Mn2+, Cu2+, Zn2+ and Ni2+

Cited by 43 publications

References 31 publications

Optical properties of deposit models for paints: full-fields FFT computations and representative volume element

Optical properties of deposit models for paints: full-fields FFT computations and representative volume element

Enhancing capacitance behaviour of CoOOH nanostructures using transition metal dopants by ambient oxidation

Combustion Catalyst: Nano‐Fe2O3 and Nano‐Thermite Al/ Fe2O3 with Different Shapes

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