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[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)
[de]Die Grossdekontamination der Bauteile des Primaerkreislaufes von aktivierten Korrosionsprodukten in der Oxidschicht der Strukturmaterialien sieht zunaechst eine ca. 1-stuendige oxidative Behandlung mit alkalischer Permanganatloesung vor. Nach einer Zwischenspuelung mit Deionat erfolgt dann ein Beizen mit einer inhibierten Citrat-Oxalat-Loesung ueber 5-20 Stunden. Anschliessend wird mit einer Citronensaeure/H2O2-Loesung, die suspendierte Faserteilchen enthaelt, nachbehandelt. (DG)
[en] A large lateral photoeffect (LPE) has been observed in an oxidized film Cox Mny 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 Cox MnyO 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] 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] 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 interesting chemical and physical properties of Mn-oxide-based nanomaterials offer a variety of technological applications. The novel Mn-oxide properties reached through synthetic design have the potential to be of tremendous contribution to modern, environmental friendly chemistry. A problem of Mn oxide crystal chemistry is that, even within a single mineral, Mn atoms can exhibit multiple valence states. An average oxidation state for Mn atoms can be easily and quite reasonably measured, however, determining the individual proportions/('weights') of Mn(IV), Mn(III), and Mn(II) in a non-destructive way is considerably more difficult. We applied X-ray absorption near edge spectroscopy (XANES) to investigate the Mn environment and to improve fundamental understanding of the structural chemistry and morphology of nanostructured Mn-oxides to produce desirable chemical and physical properties.