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Иванов, В. Г.; Safronov, M. N.; Gavrilyuk, O. V.

doi:10.1023/a:1017505709456

Cited by 46 publications

(5 citation statements)

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“…For the high heat of combustion of Al with various oxidizers that are encountered in practical applications, a considerable number of studies, such as the ignition temperature of Al in kinds of gases [5,6] and combustion characteristics [7,8], have been published, especially concerning the flame characteristics of Al combustion [9,10]. In order to improve the propulsion performance for the reaction of Al with H 2 O, and make the reaction proceed, a great deal of work has been carried out [11][12][13][14][15][16][17][18], such as the reaction of different sizes of Al with H 2 O, and the addition of Mg or Li powder into Al powder.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on Reaction Mechanism of Aluminum-Water System

Tian

2008

Chinese Journal of Chemical Physics

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A theoretical study on the reaction of aluminum with water in the gas phase was performed using the hybrid density functional B3LYP and QCISD(T) methods with the 6-311+G(d,p) and the 6-311++G(d,p) basis sets. The results show that there are three possible reaction pathways that involve four isomers, seven transition structures, and two possible products for the reaction of aluminum with water. The two most favorable reaction pathways were found, whose intermediates and products agreed quite well with experimental results. The enthalpy and Gibbs free energy change of the reaction between Al and H 2 O at 298 and 2000 K were calculated. Some results are also in good agreement with the previous calculations or experimental results.

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Section: Introductionmentioning

confidence: 99%

Theoretical Study on Reaction Mechanism of Aluminum-Water System

Tian

2008

Chinese Journal of Chemical Physics

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“…Temperatures beyond 400 °C are required for the further Al oxidation in air, but much lower temperatures may be sufficient in water. Micron sized Al particles are indeed strongly oxidized in boiling water above 230 °C, while Ivanov et al reported almost full oxidation of Al nanoparticles (of 140 nm average size) after 20 min in water at 70 °C Figure S5 reports the extinction spectra for 210 and 250 nm disk diameters acquired before and after the temperature/absorption measurements performed with laser power never exceeding 6 mW.…”

Section: Results and Discussionmentioning

confidence: 99%

Spectral Shift of the Plasmon Resonance Between the Optical Extinction and Absorption of Gold and Aluminum Nanodisks

et al. 2016

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Comparing the optical properties of plasmonic nanoparticles in terms of scattering, absorption and extinction is an active and delicate issue in nano-optics. Absorption cross sections are usually difficult to be reliably measured. In this work, the absorption of gold and aluminum nanodisks was measured using quantitative wavefront sensing. We evidence a spectral shift between the retrieved absorption and the extinction maxima. Discrete dipole approximation calculations enabled us to unravel the origins of the spectral shifts, which are different depending on the material. In the case of gold nanodisks, the mismatch between extinction and absorption (∼15 nm) is related to the frequency shift of the plasmonic field intensity between near-field and far-field regimes, respectively probed through the heat generated within the nanoparticles and the optical extinction. For aluminum nanodisks, displaying dipolar plasmon resonances in the wavelength range 700 to 850 nm, the spectral shift between extinction and absorption is ascribed to the presence of interband transitions located on the low energy side of the surface plasmon resonances.

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“…For instance, Al powders with an average particle size of 140 nm reacted readily with deionized (pure) water at temperatures of 50–75 °C and resulted in a nearly 100% Al/hydrogen conversion. [ 11 ] However, a number of drawbacks related to the ultrahigh reactivity of the Al nanoparticles, especially the safety of this reaction, have yet to be overcome.…”

Section: Introductionmentioning

confidence: 99%

TEMPO‐Oxidized Cellulose Nanofibers as Pseudocatalysts for in Situ and on‐Demand Hydrogen Generation via Aluminum Powder/Pure Water Reactions at a Temperature below 50 °C

Fugetsu

Yoshinaga

Kimura

et al. 2023

Adv Energy and Sustain Res

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Cellulose nanofibers (CNFs) prepared via 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO)‐mediated oxidation of the C6 primary hydroxyls of native cellulose to carboxylates are used as pseudocatalysts for enhancing the aluminum powder/pure water reactions. The Al powder/pure water reaction is a stepwise reaction. It starts from hydration of the outmost native Al2O3 thin layer and then the reaction of the inner metallic Al with water. At lower temperatures (<50 °C), OH− and Al3+ ions are the preliminary products of the native Al2O3 thin layer hydration. Once Al powders are mixed with pure water containing 0.1–0.5 wt% TEMPO‐CNFs, condensed networks consisting of TEMPO‐CNFs self‐establish over the native Al2O3 thin layer. Al3+ ions are captured by TEMPO‐CNFs via the formation of insoluble Al3+/TEMPO‐CNFs complexing nanostructures and the conjugated OH− ions are being restricted nearby the native Al2O3‐based thin layer via electrostatic repulsion. A highly alkaline condition (pH > 11) is dynamically generated, and as a result, the native Al2O3 thin layer dissolves rapidly via the reaction with OH− ions. The OH− ions function also as catalysts, accelerating the reaction of metallic Al with water. Al powders (2–200 μm) react promptly and a nearly 100% Al/H2 conversion is obtained at the reaction temperature below 50 °C.

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Cited by 46 publications

References 0 publications

Theoretical Study on Reaction Mechanism of Aluminum-Water System

Theoretical Study on Reaction Mechanism of Aluminum-Water System

Spectral Shift of the Plasmon Resonance Between the Optical Extinction and Absorption of Gold and Aluminum Nanodisks

TEMPO‐Oxidized Cellulose Nanofibers as Pseudocatalysts for in Situ and on‐Demand Hydrogen Generation via Aluminum Powder/Pure Water Reactions at a Temperature below 50 °C

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