Results 1 - 10 of 2072
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[en] Highlights: • Literature direct determinations of C°p for the RuO2 (s) were compared with enthalpy increments. • Formation enthalpy data for RuO2(s) oxide is the only one literature calorimetric determination. • Literature total pressure determinations are systematically under estimated. • The reliability of all EMF data let us propose to retain their standard enthalpy.
[en] This process consists in putting in contact a gas containing gaseous ruthenium with an adsorbent made of polymer or copolymer of vinylpyridin to fix ruthenium on it. Gas can be made of vapours coming from a concentrate of fission products with ruthenium in it which has been heated in the presence of an oxyding agent to volatilize ruthenium
[en] RuO2 nanotubes with diameters of 15-25 nm and up to 3 μm in length have been prepared by the thermal decomposition of Ru3(CO)12 inside alumina templates. The RuO2 (110) planes grow along the long axis of the straight crystalline nanotubes. The growth of these fluorescent nanotubes appears to have proceeded via mononuclear ruthenium carbonyl intermediates. (Abstract Copyright , Wiley Periodicals, Inc.)
[en] Effect of structure parameter n and its coupling with the connection mode among RuO_6 octahedra of Sr_n_+_1Ru_nO_3_n_+_1 (n = 1, 2, ∞) are investigated. The gradually enhanced rotation and tilting effect with increasing n are observed in Sr_n_+_1Ru_nO_3_n_+_1. Besides, the chemical valence of Ru is not changed, while the one of Sr gradually varies with increasing n, which highlights the great contribution of connection mode to the chemical environment. Our results show a strong n dependence on the connection mode between octahedra in Sr_n_+_1Ru_nO_3_n_+_1 (n = 1, 2, ∞). (paper)
[en] We demonstrate the presence of two types of commensurate, registered water monolayers with different densities at the RuO2( 110)/bulk-water (0.1M NaOH solution) interface with off-specular, oxygen crystal truncation rods. At anodic potentials (close to oxygen evolution), the extraneous water layer and the surface hydroxide layer form a bilayer with O--H--O bond distances similar to that of ice X. At cathodic potentials, the water molecules converted from the bridging OH molecules form a low-density water layer
[en] A simple electroless deposition method has been successfully developed for the preparation of the thin film of ruthenium oxide-hexacyanoferrrate. The electrochemical and electrocatalytic property of the thin film has been investigated. The RuOHCF electrode efficiently mediates the oxidation of ethanol
[en] The new preparation method of anhydrous ruthenium oxide containing ruthenium polyhydride phases has been described. The idea at the method consists in potassium ruthenate solution reaction with a mixture of alcohol and nitric acid. The product is being drying and then roasting in the temperature range 600-1000 C in the ambient gas atmosphere. 2 tabs
[en] The volatilization of ruthenium in nuclear fuel processing and waste management operations gives rise to a number of potential problems, many of which relate to the subsequent deposition of volatilized material in downstream plant and pipework. The authors conclude that volatile ruthenium deposition at temperatures of 150deg C and above, under the conditions occurring in nuclear processing plants, produces the crystalline dioxide RuO2, and that no bonding with the steel surfaces occurs. (orig.)
[en] Highlights: • Single-cored [email protected]H-SiO2 NPs with 4.3 nm Ru cores were prepared successfully. • The size of [email protected]H-SiO2 NPs was controllable. • The [email protected]H-SiO2 structure showed promising aggregate-resistant performance. Single-cored [email protected]H-SiO2 (H: hollow) core–shell nanoparticles (NPs) with around 4.3 nm Ru cores and hollow SiO2 shells were prepared successfully. In this synthetic process, we obtained multi-cored [email protected]2 NPs initially, single-cored RuO2@H-SiO2 NPs during treatment, and single-cored [email protected]H-SiO2 NPs in the end. The [email protected]2 NPs were prepared by water-in-oil microemulsion method, and the size and core number of [email protected]2 NPs can be controlled. Single-cored RuO2@H-SiO2 NPs and [email protected]H-SiO2 NPs were successively obtained by calcination and reduction. The structure showed promising aggregate-resistant performance and potential application in catalysis.