[en] We investigate the influence of MnO₂ polymorphism form on MnO₂/Ag₂O hydrogen getter. The results show that the performances strongly depend on the polymorphism form of manganese oxide. The nsutite γ-MnO₂ phase, which consists of a random intergrowth of MnO₂–ramsdellite and MnO₂–pyrolusite building blocks, shows the more promising performances to trap H₂ via the formation of hydroxyl groups. This observation is especially relevant for compounds with a low pyrolusite/ramsdellite ratio and a high rate of microtwinnings

[en] The spectral-luminescent properties of radiophotoluminescent phosphate glasses are studied in the Ag₂O concentration range 0.05-4.0 wt% and at the γ-irradiation dose 10²-10⁴ Gy. At the Ag₂O concentrations not over 0.1 wt%, the radiophotoluminescence spectrum consists of a broad band, whose contour is well described by Gauss' function, with a maximum at 650 nm. At Ag₂O concentrations higher than 0.1 wt%, the radiophotoluminescence spectrum is the superposition of two Gaussian bands with intensity maxima at 650 and 450 nm. The ratio of band intensities depends on the Ag₂O concentration, conditions of the heat treatment of the irradiated samples, and irradiation dose. The correlation between the concentration dependences of radio-photoluminescence spectra and those of luminescence spectra for unirradiated glasses, which are activated with silver, is revealed

[en] In the compacted bentonite containing Ag₂O, the transport of iodide ion was investigated by Through-diffusion method. It is confirmed that Iodide ion is transported by diffusion process in the compacted bentonite containing Ag₂O as well as in the compacted bentonite without Ag₂O. However, the lag-time of iodide ion in the compacted bentonite containing Ag₂O is larger than that in the compacted bentonite without Ag₂O. The increase of the lag-time was observed in pure iodide ion solution and also in 0.1M NaCl-iodide ion solution. The apparent diffusion coefficient of iodide ion in the compacted bentonite containing Ag₂O has lower value than that in the compacted bentonite without Ag₂O. The effect of Ag₂O on the effective diffusion coefficient was not clearly investigated in the compacted bentonite containing Ag₂O while the values of effective diffusion coefficient of iodide ion in the compacted bentonite without Ag₂O obtained in this study were similar to those in the compacted bentonite reported in the literature

[en] Infrared (IR) spectroscopic investigation of binary silver borate glasses in the system xAg2 O. (1-x) B2 O3 for various values of x (0< x <0.77) has been performed in order to understand the glass modifying properties of Ag2 O. The IR spectra show clearly the disappearance of boroxol rings and the formation, in a first step, of tetraborate groups and later of diborate groups as the oxide content increases. For high Ag2 O content, borate groups with non-bridging oxygen atoms are formed

[en] Development of eco-friendly biosynthesis process for the synthesis of stable silver Nanoparticles is congregating researchers since past few years. In this study eco-friendly synthesis of stable silver Nanoparticles was done by using Phaseolus vulgaris seeds extract. The formation of nanoparticles was characterized by visual observation followed by UV-Vis spectrophotometric analysis, which showed a peak around 450 nm, which is very specific for silver nanoparticles. Further analysis carried out by Fourier Transform Infrared Spectroscopy (FTIR), provides evidence for the presence of proteins as capping agent, which helps in increasing the stability of the synthesized silver nanoparticles. All the three plant extracts were found to exhibit strong potential for rapid reduction of silver ions. The synthesized nanoparticles are then analyzed for their potency in medical applications. Biosynthesis of nanoparticles are proving to be more effective in medicinal applications than the bare metal nanoparticles since the biomass coatings on them act synergistically with the metal nanoparticles. (author)

[en] It has been reported that the fragility in the AgI-Ag₂O-M_xO_y (M = B, Ge, P, Mo) system is determined by Ag₂O-M_xO_y and does not depend on the amount of AgI. This is an interesting result and provides a hint to understand the nature of the glassy state of these materials. However, the origin of such behavior has not been sufficiently discussed. In the present report a model for the above behavior is presented. According to the model, the behavior arises from the solid like nature of the network formed by Ag₂O-M_xO_y and the liquid like AgI which flow between the networks. The model is consistent with the structural model of superionic glasses proposed previously.

[en] In this work, silver oxide AgO films were prepared and deposited on glass substrates using RF reactive magnetron sputtering technique at different sputtering powers (100, 150 and 200) W. The X-Ray diffraction measurements showed that the prepared films are polycrystalline. It was found that the crystalline size and roughness of the surface, in addition the optical energy gap It has decreased with the increasing sputter power. One of the important results is the development of sensitivity with crystallization, where it was the best sensitivity at operating temperature 100 °C of the sample deposited at 200 W and at the concentration of target gas 600 ppm.

[en] Determination of plutonium in nuclear fuel materials is routinely carried out by a potentiometric method based on the oxidation of Pu to the hexavalent state by AgO, destruction of the excess AgO by sulphamic acid, reduction of Pu(VI) to Pu(IV) using a known excess of Fe(II) and titration of the excess Fe(II) with standard K₂Cr₂O₇

[en] Photolysis of Chicago Sky Blue diazo dye in aqueous solutions and films containing zinc and silver oxides is studied. The presence of zinc and silver nitrates in aqueous solutions of this dye considerably increase the rate of its photolysis under UV irradiation. ZnO and ZnO:Ag oxide films and composite coatings with zinc and silver nitrates also considerably affect the photolysis of Chicago Sky Blue diazo dye.

[en] Highlights: • Sensitive electrochemical techniques were used to evidence the formation of Ag(III). • The required potential for the generation of Ag(III) was found by using UV–vis to monitor species being formed. • A mechanism for the production of Ag(III) in the form of Ag(OH)₄⁻ is proposed. -- Abstract: A mechanism based on electrochemical, spectrophotometric and scanning electron microscopy (SEM) data in alkaline media is proposed for the generation of Ag(III) in the form of Ag(OH)₄⁻. The formation of Ag(III) from Ag⁰ is a rather complex multistep process that involves several steps. The presence of soluble Ag(I) species as Ag(OH)₂⁻ is of paramount importance for the production of soluble Ag(OH)₄⁻, whose decomposition time is shown to exceed 8 h