Preparation of carbon-coated cobalt nanocrystals in a new gas blow arc reactor and their characterization

Article Abstract:

Carbon-coated cobalt nanocrystals were produced through a modified technique of arc discharge under a He gas blow around a graphite rod cathode. The morphology and structure of the carbon coating and the cobalt enclosure were studied through high-resolution transmission electron microscopy, Raman scattering and X-ray diffraction. The magnetic characteristics of these particles after acid treatment were measured through a vibrating sample magnetometer and a thermogrametric analyzer in a magnetic field gradient.

Carbon, Crystals, Cobalt

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Emission characteristics of silver atoms in gamma-irradiated organic solid solutions at 77 K

Article Abstract:

The optical absorption, steady-state emission and excitation spectra of Ag0 atoms produced by gamma-irradiation at 4 or 77 K in aqueous, ethanol, and 2-methyltetrahydrofuran (MTHF) solutions with Ag+ of 0.015 M have been studied. It has been observed that two main emission bands exist at 500 and 580 nm. Increasing the concentration of Ag+ in both solutions increased the intensity of the 500 nm band but decreased the intensity of the 580 nm band.

Photoluminescence, Photoionization, Silver

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Recombination reactions of oxygen atoms on an anodized aluminum plasma reactor wall, studied by a spinning wall method

Article Abstract:

The recombination of O atoms on an anodized Al surface in oxygen plasma is studied using a new spinning wall technique and a multisite adsorption model is developed. The model reproduces the observed shapes of the O2 desorption decay curves and the lack of detectable desorption of O and predicts a high O-atom recombination coefficient on anodized aluminum with several adjustable parameters.

Texas, Oxides, Ablation (Vaporization technology), Properties, Structure, Ablation (Vapourization technology)

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