Nickel–alumina nanocomposite powders prepared by novel <i>in situ</i>chemical reduction

Huang, Zhengren; Jiang, Dongliang; Michel, D.; Mazérolles, L.; Ferrand, Alain; Costanzo, Thomas Di; Vignes, J.‐L.

doi:10.1557/jmr.2002.0459

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…After impregnation, the solvent is removed by evaporation and the nanoparticles precipitate inside. In this way, Al 2 O 3 -TiO 2 (titania nanoparticles in a porous alumina) [321,322], or alumina-nickel Al 2 O 3 -Ni (obtained by a reduction of NiO nanoparticles during annealing in hydrogen) [323] nanocomposites were prepared and studied.…”

Section: Development Of Novel Materials For Terahertz Opticsmentioning

confidence: 99%

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

Zaytsev

Dolganova

Chernomyrdin

et al. 2019

J. Opt.

164

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Over the past few decades, significant attention has been paid to the biomedical applications of terahertz (THz) technology. Nowadays, THz spectroscopy and imaging have allowed numerous demanding problems in the biological, medical, food, plant and pharmaceutical sciences to be solved. Among the biomedical applications, the label-free diagnosis of malignant and benign neoplasms represents one of the most attractive branches of THz technology. Despite this attractiveness, THz diagnosis methods are still far from being ready for use in medical practice. In this review, we consider modern research results in the THz diagnosis of malignant and benign neoplasms, along with the topical research and engineering problems which restrain the translation of THz technology to clinics. We start by analyzing the common models of THz-wave-tissue interactions and the effects of tissue exposure to THz waves. Then, we discuss the existing modalities of THz spectroscopic and imaging systems, which have either already been applied in medical imaging, or hold strong potential. We summarize the earlier-reported and original results of the THz measurements of neoplasms with different nosology and localization. We pay attention to the origin of contrast between healthy and pathological tissues in the THz spectra and images, and discuss the prospects of THz technology in

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Section: Development Of Novel Materials For Terahertz Opticsmentioning

confidence: 99%

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

Zaytsev

Dolganova

Chernomyrdin

et al. 2019

J. Opt.

164

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“…Another route used was to reduce the spinel formed by the reaction discussed previously. Depending on the preparative route, the temperature of reduction (between 650 and 1025 °C) and the oxygen partial pressure (between 10 -8 to 10 -15 Pa), metallic particles have a size distribution varying from 10 to 100 nm [8]. These composites consist of Ni or Co particles dispersed in a porous matrix of submicronic -alumina or in a nanometric or phase, Fig.…”

Section: Al 2 O 3 -Oxide and Al 2 O 3 -Metal Nanocompositesmentioning

confidence: 99%

New Method of Porous Oxide Synthesis: Alumina and Alumina Based Compounds

Costanzo

Фомкин²,

Frappart³

et al. 2004

MSF

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Novelty of the synthesis method is the use of alumina hydroxides with very low initial density ~0.02 g/cm 3 . This porous alumina monolith (PAM) is obtained first by active oxidation of aluminum in a humid atmosphere through a liquid mercury layer. Then, in the second step, a thermal treatment of PAM between 1000 and 1700 °C allows sintering of porous alumina with the density varying between 0.04 and 3 g/cm 3 consisting of -or ¡ -alumina crystallites with submicron or micron size and with specific surface area up to ~100 m 2 /g. Fibrous structures have a high surface to volume ratio and transport is possible only along fibers -this determines the kinetics of structure formation and transformations during synthesis. Due to very high porosity, these materials can have different applications: high temperature filters, substrate for the catalysts and nuclear waste storage. Porous aluminas can be impregnated by liquid or gaseous species and after drying and solidification can be used as precursors for subsequent synthesis of porous compounds. Impregnation by magnesium, nickel or cobalt nitrate solutions followed by thermal treatment leads to spinels; synthesis of mullite can be provided using silicon species. The obtained porous spinels have finer microstructures and higher specific surface areas than those formed with ¡ -alumina. However, the nanometric size of Al 2 O 3 allows reaction at lower temperatures.Materials, having low density or high porosity, high specific surface area and fine grain structure, are needed for catalysts, sensors, filtration membranes, composites, etc. The range of technological applications of these materials depends on possibilities to obtain and control the required microstructure or/and chemical composition. This paper describes a new approach to the problem of synthesis of porous materials based on alumina and alumina compounds.

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“…The formation and the stability of spinel and its capacity to be reduced seem to vary according to the reaction undertaken to form spinel, the stoichiometry and Al 2 O 3 -type. In [16], spinel was produced by solid state reaction with nanometric gamma phase alumina (γ-Al 2 O 3 ) impregnated with nickel nitrate (Νi(ΝΟ 3 ) 2 •6H 2 O), at temperatures ranging between 1,000°C and 1,300°C. The authors observed that the catalyst was totally reduced at temperatures higher than 950°C, with a mixture of CO and CO 2 as reducing atmosphere (and oxygen partial pressure of 1x10 -15 atm).…”

Section: Spinel Catalystmentioning

confidence: 99%

Biodiesel reforming with a NiAl₂O₄/Al₂O₃-YSZ catalyst for the production of renewable SOFC fuel

Abatzoglou¹,

Fauteux‐Lefebvre²,

Braidy³

2014

Biomass to Biofuels

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Biodiesel's contribution as a renewable energy carrier is increasing continuously. Fuel cell market penetration, although slow, is now an irreversible reality. The combination of solid oxide fuel cells (SOFC) with biodiesel offers considerable advantages because it entails both high energy conversion efficiency and nearzero atmospheric carbon emissions. This work is aimed at proving the efficiency of a newly-developed (patent pending), Al 2 O 3 /YSZ-supported NiAl 2 O 4 spinel catalyst to steam reform biodiesel. Reforming converts biodiesel into a gaseous mixture, mainly composed of H 2 and CO, used directly as SOFC fuel. The work is performed in a test rig comprising a lab-scale, fixed-bed isothermal reactor and a product-conditioning train. The biodiesel/water mixtures are emulsified prior to their spray injection in the reactor preheating zone, where they are instantaneously vaporized and rapidly brought to the desired reaction temperature to avoid thermal cracking. Reforming takes place at gas hourly space velocities equal to or higher than those in industrial reforming units. The products are analysed by at-line gas chromatography. The results show that biodiesel conversion is complete at steady state. Thermodynamic calculations reveal that the fast reforming reaction reaches chemical equilibrium. The catalyst's performance is very efficient and prevents carbon formation and deactivation.

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Nickel–alumina nanocomposite powders prepared by novel in situchemical reduction

Cited by 8 publications

References 12 publications

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

New Method of Porous Oxide Synthesis: Alumina and Alumina Based Compounds

Biodiesel reforming with a NiAl₂O₄/Al₂O₃-YSZ catalyst for the production of renewable SOFC fuel

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Nickel–alumina nanocomposite powders prepared by novel in situchemical reduction

Cited by 8 publications

References 12 publications

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

The progress and perspectives of terahertz technology for diagnosis of neoplasms: a review

New Method of Porous Oxide Synthesis: Alumina and Alumina Based Compounds

Biodiesel reforming with a NiAl2O4/Al2O3-YSZ catalyst for the production of renewable SOFC fuel

Contact Info

Product

Resources

About

Biodiesel reforming with a NiAl₂O₄/Al₂O₃-YSZ catalyst for the production of renewable SOFC fuel