Coated Electrodes Research Articles

On the Particle-Contaminated GIS/GITL Systems with Dielectric Coated Electrodes

On the Particle-Contaminated GIS/GITL Systems with Dielectric Coated Electrodes

Effect of cocaine, nomifensine, GBR 12909 and WIN 35428 on carbon fiber microelectrode sensitivity for voltammetric recording of dopamine

Electrochemical measurements using voltammetry or amperometry at carbon-fiber microelectrodes have been used in vitro and in vivo to examine regulatory mechanisms for the central dopamine system. In many of these experiments, dopamine efflux concentrations under control conditions are determined followed by their alterations in response to a drug treatment. The present study demonstrates that some drugs can affect dopamine measurements, not only by their expected pharmacological action but also by directly altering the microelectrode responsivity. The commonly used reuptake inhibitors GBR 12909 (10 μM) and nomifensine (5 μM) drastically reduce electrode sensitivity and, in the case of nomifensine, increase the time to reach a plateau in response to dopamine boluses (i.e. reduced ‘frequency response’). Cocaine (10 μM) and WIN 35428 (2 μM) have negligible effect on these indices. This decrease in sensitivity was found in both nafion and non-nafion coated electrodes. Further, the reduction in sensitivity seen in non-nafion coated electrodes was not prevented by increasing the reversal potential (from +1.0 to +1.3 V) and voltage scan rate (from 350 to 450 V/s). These data suggest that care must be taken when interpreting data from voltammetric or amporometric experiments using carbon electrodes where GBR 12909 or nomifensine are used, especially at high concentrations. Furthermore, wherever possible, direct effects of a drug on electrode sensitivity and frequency response should be determined.

SF<sub>6</sub>ガス中絶縁被覆電極上の金属異物浮上時の帯電機構

SF<sub>6</sub>ガス中絶縁被覆電極上の金属異物浮上時の帯電機構

Photoinduced electron transfer reactions of [Ru(bpy) 3] 2+ adsorbed onto Nafion® and clay coated electrodes in the presence of Fe 3+ ions

A photogalvanic cell was constructed using Nafion® and montmorillonite (MM) clay adsorbed [Ru(bpy) 3] 2+ coated electrodes in the presence of Fe 3+ ions. Nafion® and MM clay adsorbed [Ru(bpy) 3] 2+ electrodes exhibited different photoelectrochemical behavior depending on the coating material. While anodic behavior was observed at a Nafion®-[Ru(bpy) 3] 2+ electrode with reference to an inert electrode in a photogalvanic cell, the MM clay-[Ru(bpy) 3] 2+ electrode showed cathodic polarity. A new photogalvanic cell was constructed by coating one electrode with Nafion®-[Ru(bpy) 3] 2+ and the other electrode with MM clay-[Ru(bpy) 3] 2+. This new photogalvanic cell showed an additive photogalvanic response on visible light irradiation.

IMPAX WELD COATED ELECTRODE and IMPAX TIG-WELD FILLER ROD

Abstract IMPAX WELD COATED ELECTRODE and IMPAX TIG-WELD TIG FILLER ROD give a deposited weld metal almost identical in composition to IMPAX SUPREME parent metal. Both the electrode and the filler rod are also suitable for welding standard AISI P20 tool steel grades and Uddeholm Holder grades. Composed to be compatible with Uddeholm Mold Steel Impax Supreme, Alloy Digest TS-497, March 1989. This datasheet provides information on composition, hardness, and tensile properties. It also includes information on joining. Filing Code: TS-505. Producer or source: Uddeholm Corporation.

STAVAX WELD ELECTRODE STAVAX TIG-WELD FILLER ROD

Abstract STAVAX WELD ELECTRODE is a basic coated electrode and STAVAX TIG-WELD is a TIG bare filler rod. Both are specially composed to be compatible with the Uddeholm stainless mold steel, STAVAX ESR (Alloy Digest SS-507, June 1989). This datasheet provides information on composition and hardness. It also includes information on joining. Filing Code: SS-518. Producer or source: Uddeholm Corporation.

Investigation of hydrogen evolution on Raney-Nickel composite-coated electrodes

The hydrogen discharge on the Raney nickel composite coated electrode is investigated in 30% wt NaOH aqueous solution at 70°C by ac impedance technique. The easiest pathway for the hydrogen evolution reaction (HER) is the Volmer-Heyrovsky mechanism. Both Volmer and Heyrovsky steps control the reaction. The increase in the electrocatalytic activity from 30% wt NaOH to 1.04 M NaOH at 70°C is related to a larger exchange current density of the HER.

Desulphurisation of deposited metal in arc welding with basic coated electrodes

Desulphurisation of deposited metal in arc welding with basic coated electrodes

Special features of the effect of complex master alloys on the gas content of deposited metal in welding with basic coated electrodes

Special features of the effect of complex master alloys on the gas content of deposited metal in welding with basic coated electrodes

Factors influencing the properties of voltammetric carbon fibre electrodes: the importance of the pH of the medium used for the electrical treatment and of the resin coating of the fibres

Electrical treatment of resin-coated voltammetric carbon fibre electrodes with triangular voltage at low (1.1) pH resulted in electrodes almost insensitive to ascorbic acid (AA) and dihydroxyphenylacetic acid (DOPAC) while their response to 5-hydroxyindoleacetic acid (5-HIAA) was practically the same as after treatment in the usually employed pH 7.4 medium. Electrodes treated at high pH (12.0), on the other hand, were more sensitive to AA and DOPAC than those treated at pH 7.4 and less sensitive to 5-HIAA. Exposing resin-coated electrodes to the treatment media without electrical treatment was not sufficient to obtain the same results as with the application of the current. Electrodes without resin coating were sensitive to AA without electrical treatment while coated electrodes were not. Electrical treatment increased the sensitivity of non-coated electrodes and rendered coated electrodes even more sensitive than non-coated ones. Treatment of coated electrodes for a maximum sensitivity to 5-HIAA was found to require less time than to obtain maximum sensitivity to the other compounds. Present results suggest that it is possible to prepare selective voltammetric electrodes by choosing the right parameters for their electrical pretreatment.

ChemInform Abstract: ELECTROORGANIC REACTIONS ON ORGANIC ELECTRODES. 7: STEREOCHEMICAL STUDIES OF THE ELECTROLYTIC REACTIONS OF ORGANIC COMPOUNDS. PART 26. ELECTROCHEMICAL ENANTIOMER‐DIFFERENTIATING OXIDATION OF A RACEMIC ALCOHOL ON POLY(L‐VALINE)‐COATED ELECTRODES

Chemischer InformationsdienstVolume 15, Issue 41 Article ChemInform Abstract: ELECTROORGANIC REACTIONS ON ORGANIC ELECTRODES. 7: STEREOCHEMICAL STUDIES OF THE ELECTROLYTIC REACTIONS OF ORGANIC COMPOUNDS. PART 26. ELECTROCHEMICAL ENANTIOMER-DIFFERENTIATING OXIDATION OF A RACEMIC ALCOHOL ON POLY(L-VALINE)-COATED ELECTRODES T. KOMORI, T. KOMORISearch for more papers by this authorT. NONAKA, T. NONAKASearch for more papers by this author T. KOMORI, T. KOMORISearch for more papers by this authorT. NONAKA, T. NONAKASearch for more papers by this author First published: October 9, 1984 https://doi.org/10.1002/chin.198441094AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume15, Issue41October 9, 1984 RelatedInformation

天然色映画による軟鋼被覆アーク熔接棒の溶融スラグ流動状態の観察

It is a very valuable subject to study how at ease we can weld or operate with a specific electrode, and there may be many different opinions as to the factors of USABILITY of electrode, if we so call it.We have tried to clarify such factors of of electrode, though with difficulties, and according to our investigations it is considered that fluidity of (fluid condition of slag), amongall, has very close relations with the usability of electrode.One of our investigations about the usability, therefore, has been directed to the molten slag of welding.For this purpose we took a 50-frames-per second 16 mm colour film, to closely observe the fluid condition of molten slag. The several electrodes with typical types of coating, i.e. iluminite, high cellulose, rutile, low hydrogen, high iron oxide and iron powder, and some other electrodes on the market were presented for filming.In these photographs, the characteristics of each molten slag in its fluidification and solification called our great interest. Especially, rutile and low hydrogen type electrodes showed the extremes in fluidity.Furthermore, using the low hydrogen type electrode which are not so good in usability, the aspect of molten slag was found as remarkably distinguished from the others.We thus could reach a conclusion that the fluid conditions of molten slag was connected with physi-cal properties, such as viscosity, surface tension and specific gravity at various temperatures, and also with the solidificable and the fluidable temperature.The ESAB OK-53P double coated electrode is known as being able to effect the complete wave welding without back sealing run on the Vee Groove joint. This complete back wave could also be well understood by observing the specific feature of the aspects of the molten slag in our movie.