No abstract available

No abstract available

No abstract available

[en] The large decontamination of components of the primary circuit of activated corrosion products in the oxide layer of the structure materials firstly involves an approx. 1 hour oxidation treatment with alkali permanganate solution. Following intermediate rinsing with deionate, they are etched with an inhibited citrate-oxalate solution for 5-20 hours. This is followed by post-treatment with a citric acid/H₂O₂ solution containing suspended fiber particles. (DG)

No abstract available

No abstract available

[en] A simple method based on a conventional solid-state process is proposed for synthesis of manganese oxide nanowires. This method provides an opportunity for bunching the nanowires synthesized, since the nanowires form in one direction. Thus, aligned bunches (e.g. >100 μm long and about 50 μm in diameter) consisting of individual nanowires (diameters ranging between 50 and 200 nm) can be prepared simply. The phenomenon of simultaneous alignment of the nanowires in one direction to form ordered bunches is indeed an interesting development in the realm of nanotechnology. It can be considered as an alternative to conventional template-based methods

[en] A large lateral photoeffect (LPE) has been observed in an oxidized film Co_x Mn_y O deposited on an n-type Si substrate by sputtering. Under the nonuniform illumination of a laser beam, the lateral photovoltage shows a high sensitivity to the spot position on the Co_x Mn_yO surface. The largest open-circuit position sensitivity is about 34.3 mV mm^-1. These phenomena were discussed in terms of the metal-semiconductor junction which exists between the oxidized film and the Si substrate. The large LPE is expected to make the oxidized film a new candidate for position-sensitive photodectors

[en] Excess amount of analgesic and anti-inflammatory drug, such as indomethacin, often leads to serious gastrointestinal complications; therefore, amount of such active compound should be regulated in commercial drugs. This study proposes an efficient analytical technique to detect indomethacin selectively. We prepared and investigated electrochemical properties of a manganese dioxide-graphene nanocomposite film modified glassy carbon electrode (MnO_2-Gr/GCE). The behavior of the modified electrode as electrocatalyst towards indomethacin oxidation was also examined. The cyclic voltammetric results reveal that the electrocatalytic activity for the oxidation of indomethacin can significantly be enhanced on the MnO_2-Gr/GCE. Indomethacin exhibited a sensitive anodic peak at about 0.90 V at MnO_2-Gr/GCE. The data obtained from differential pulse voltammetry showed that the anodic peak currents were linearly dependent on the indomethacin concentrations in the range of 1.0 X 10"-"7 to 2.5 X 10"-"5 mol/L with a detection limit of 3.2 X 10"-"8 mol/L (S/N = 3). Most importantly, the proposed method shows efficient and selective sensing of indomethacin in commercial harmaceutical formulations. This is the first report of a voltammetric sensor for indomethacin using MnO_2-Gr/GCE. We believe that this new method can be commercialized for routine applications in laboratories.

[en] The extensive research performed on metal oxide adsorption, the adsorption phenomena and physical conditions of cationic adsorption on manganese dioxide in solution have demonstrated that above pH 3 cations are adsorbed by an order of affinity, and that the interaction is characterized by the pH dependence of the metal. The relationship of the zero point charge of pH and the solution ionic strength effects on interfacial surface potential and adsorption have been addressed. A system to produce MnO₂ fiber with a heavy MnO₂ loading was designed, constructed, and operated successfully. Extensive testing has been performed on the adsorption of radium, calcium, cadmium, cesium, cobalt, iron, and manganese on MnO₂ fiber. This testing entailed field work utilizing bleed stream tests of MnO₂ fiber cartridges and tests of loose MnO₂ fiber and resin in columns. Radium removal amounted to a level of 36.9 nanocuries per gram MnO₂, or 2 microcuries on a single 10 inch MnO₂ fiber filter element. Removal of metals from solutions was demonstrated at various rates specific for each metal tested. The order of affinity of those metals tested and the combined effects of electrolytic solutions was compared to previous research. The analysis of radium in water was performed using a highly modified procedure which is included to specify the exact steps of the analytical method followed. This method has introduced innovations in equipment, technique, and the use of reagents. Results of a comparison of MnO₂ fiber to commercial water treatment media for the removal of cobalt and cesium is presented