Silver oxide composites

High Temperature Processing of Oxide Superconductors and Superconducting Oxide—Silver Oxide Composite... 

A third group includes silver—nickel, silver—cadmium oxide, and silver—graphite combinations. These materials are characterized by low contact resistance, some resistance to arc erosion, and excellent non sticking characteristics. They can be considered intermediate in overall properties between silver alloys and silver or copper—refractory compositions. Silver—cadmium oxide compositions, the most popular of this class, have wide appHcation in aircraft relays, motor controllers, and line starters and controls. 

Fig. 1. Schematic representation of a battery system also known as an electrochemical transducer where the anode, also known as electron state 1, may be comprised of lithium, magnesium, zinc, cadmium, lead, or hydrogen, and the cathode, or electron state 11, depending on the composition of the anode, may be lead dioxide, manganese dioxide, nickel oxide, iron disulfide, oxygen, silver oxide, or iodine.

The silver catalyst was prepared by reducing silver oxide. The silver oxide used was prepared by adding a solution of potasium hydroxide to an aqueous solution of silver nitrate. A small amount of 0.3% K SO solution was added to the silver oxide powder as a promoter and, after mixing, was dried at 105°C for 24hr in a dark room. This was coated on a-A O of 20-42 mesh in the presence of a small amount of ethanol until the sample reached a size of 12-14 mesh. After the ethanol in the silver oxide powder had been completely vaporized in air at room temperature, the sample was reduced in a reactor with a flow of for 12 hr at 50°C and successively for 12 hr at 100°C. The composition of the catalyst so prepared was 206.0 g-Ag, 1.132 g-K S0 / 5 3.5 g-A O. The BET surface area was 0.3 m / g-A.g. HThe constant activity of this catalyst was obtained by flowing the mixture of 5% C H, 20% 0 and 75% He at 91°C for 48 hr. 1... 

Ag/Si02 composites prepared by the one-step method and two-step methods were characterized by TGA/DTA, FTIR, XRD, and TEM. The results showed that Ag or silver oxide nanoparticles in 20 to30 nm were dispersed on the surface of the carrier Si02. The calcination temperature and prepared method affect the crystal phase of the functional component. 

Diammino-silver Nitrate, [Ag(NII3)2]N03.—When aqueous ammonia is added to a solution of silver nitrate until the precipitate first formed redissolves and the solution is evaporated, a crystalline substance separates of composition [Ag(NH3)2]N03. The compound can also be formed by dissolving silver oxide in an anunoniaeal solution of ammonium nitrate, or by dissolving silver nitrate in benzonitrile and passing ammonia gas into the solution.2... 

The first compound of the ammino-rhodium series examined was chloro-pentammino-rhodium chloride, [Rh(NH3)5Cl]Cl2, which vras prepared by treating rhodium trichloride with ammonia. Claus 1 investigated the composition of the substance and prepared from it, by means of moist silver oxide, a strongly basic substance, which proved to be the corresponding hydroxide, [Rh(NH3)5Cl](OH)2. 

We disclose a colorless composition comprising silver particles and water, wherein said particles comprise an interior of elemental silver and an exterior of ionic silver oxide, wherein the silver particles are present in the water at a level of about 5-40 ppm, and wherein the composition manifests significant antimicrobial properties including antiviral properties. Methods of use of the composition are described. 

The silver catalyst used was prepared from silver oxide by the same procedure as the catalyst used for ethylene oxidation [8J, which contained a small amount of K2S0<, as a promoter and supported on ct-Al203 of 20-40 mesh. The composition of this sample was 154g-Ag,... 

The metal surface of the metal-wrapped silk showed a variation in coloration in the backscattered image, and this variation reflected the variable composition of the surface layer (Figure 7). The elemental map shows areas where silver broke through the gold coating. With no other heavy elements present, it is assumed that these layers were silver oxides. 

The silver-silver bromide electrodes were of the thermal type, made by heating a paste composed of 90 wt % silver oxide and 10% silver bromate, with a little water, to 600°C on a helix of platinum wire. In order to avoid solvent occlusion, the electrodes were not pretreated before use in the cells. After each run, the electrodes were cleaned and remade before immersion in a solution of a different composition. 

Ceria-based systems showed mixed effects for methane oxidation. Composite catalysts of Ag/Ce02 fall apart, forming large silver metal aggregates and deactivating the catalyst system (38). The only system in which silver-modified ceria found any promise is in solid oxide fuel cells utilizing yttira-stabilized zirconia however, the silver-based system was not the optimum one in this case (39). 

Uranous Hydroxide.—The addition of alkali to a solution of a uranous salt produces a reddish-brown gelatinous precipitate, which darkens in colour on boiling the solution. If dried in vacuo it becomes black and has the composition UOg.HgO. This rapidly oxidises in the air and readily dissolves in dilute acids, forming uranous salts. It acts upon a neutral solution of silver nitrate, first precipitating silver oxide and forming a green solution which, however, soon turns yellow, and the oxide is reduced to metallic silver as the uranyl salt forms in solution, thus ... 

Two different stages for silver deposition on platinum can be described one at 1.1 V vs. RHE responding to a silver-platinum alloy electrodissolution (overlapped with the oxygen electroadsorption at free platinum sites) and the other at 0.65 V due to the silver oxidation (from the onset of the bulk deposition process) deposited on the former surface alloy [88,89]. The former process splits into two peaks when the potentiostatic ageing is performed. The spectroscopic techniques such as XPS and ARXPS (angle resolved x-ray photoelectron spectroscopy) were used to determine the chemical composition of the silver films on the platinum in an acid solution [92], The technique was not able to discern between the presence of silver oxides and sulfates, only an energy shift of the clean silver 3d5/2 band at a upd level of —0.5 eV was detected. 

The method of its synthesis and the composition of its chloride indicate it to be related to tetramethyiammonium hydrate, but when its chloride is decomposed by silver oxide, it is not with substitution of OH for Cl, but vrith separation of d -h H,0. 

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