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Electrochemical oxidation of salicylhydroxamic acid on Pt electrode

Abstract

The electrochemical oxidation behavior of salicylhydroxamic acid (SHAM) on a Pt electrode was investigated in aqueous solution of different pHs, containing 10 mM of SHAM, at 25°C, by cyclic voltammetry technique. The results indicate that the SHAM was oxidized more easily in alkaline medium than acidic and neutral mediums, and the oxidation peaks of SHAM shifted toward lower potential values by increasing pH values. The SHAM electrooxidation involves an irreversible transfer of one or two electron, depending on the pH of solution. If solution pH is lower than 3 and higher than 7, the two electron transfer is involved in the electrooxidation. While, from pH=3 to pH=7, the SHAM electrooxidation involves an irreversible transfer of one electron and two protons in the first step, in agreement with the one step one-electron mechanism. The effect of SHAM concentration on the electrode reaction was investigated in artificial saliva solution. SHAM gives a single irreversible oxidation wave over the wide concentration range studied. Possible mechanism of SHAM electrooxidation was proposed.

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INFLUENCE OF SALIVA AND ITS SUBSTITUTES ON CORROSION OF SOME IMPLANT ALLOYS

Abstract

The purpose of this paper is evaluation of the influence of human saliva and its substitutes on the corrosion resistance of some implant alloys used in stomatology, which included: austenitic steel (316L), titanium alloy (Ti6Al4V), and cobalt alloy (CoCrMo). Corrosion studies were conducted by means of the potentiodynamic method with the application of the VoltaLab 21 kit with VoltaMaster 4 software. The reference electrode was a saturated calomel electrode (SCE), whereas the counter electrode was a platinum electrode. The results of conducted studies indicate an increased current density in the passive range on potentiodynamic curves of studied alloys in the environment of human saliva, and also in a commercial saliva solution - Mucinox. On the basis of conducted corrosion studies, it can be stated that in terms of corrosion resistance the developed saliva substitutes may constitute competitive solutions to commercial saliva substitutes. The prepared substitutes should be studied further from the perspective of practical application for patients. The original value of the paper is a proposition of new saliva substitutes.

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Differential Pulse Anodic Stripping Voltammetry for Mercury Determination

aqueous medium of NaClO4 on platinum electrode. Rev. Roum. Chim., 2012, 57, 37-841. 10. Afkhami, A.; Kafrashi, F.; Madrakian, T. Electrochemical determination of levodopa in the presence of ascorbic acid by polyglycine/ZnO nanoparticles/multi-walledcarbon nanotubes-modified carbon paste electrode, Ionics, 2015, 21, 1-11. 11. Duca, A.; Găburici, M.; Ivănoiu, M.; Goldstein, S. Electrozi modificaţi în electrosinteză şi electroanaliză, vol .I. Ed. Tehnopress, Iaşi, 2002, pp. 71. 12. Guha, K.; Mascarenhas, R.; Thomas, T.; D

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Determination of 25 Low Molecular Weight Carbohydrates in Tobacco by High Performance Ion Chromatography

: Determination of neutral sugars and hexosamines by high performance liquid chromatography with pulsed am-perometric detector; Analyst 117 (1992) 1715-1718. 20. Johnson, D.C. and W.R. LaCourse: Liquid chromatography with pulsed amperometric electrochemical detection at gold and platinum electrodes; Anal. Chem. 62 (1990) 598-597. 21. Welch, L.E., D.A. Mead jr. and D.C. Johnson: A comparison of pulsed amperometric detection and conducivity detection for carbohydrates; Analytica Chim. Acta 204 (1988) 323

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Voltammetric characterization of Hg2+ ion behaviour in acid media on different electrodes

4 on platinum electrode. Rev. Roum. Chim. 2012, 57, 837-841. 19. Sandu, A. V., Ciomaga, Al. , Nemtoi, Gh., Bejenariu, C., Sandu, I. SEMEDX and microftir studies on evaluation of protection capacity some thin phosphate layers. Microscopy Research and Technique 2012, 75, 1711-1716. 20. Nemţoi, Gh., Chiriac, H., Dragoş, O., Apostu, M.O., Lutic, D. The voltammetric characterization of electrodeposition of cobalt,nickel and iron on gold disk electrod Acta Chemica Iaşi 2009, 17, 151-168. 21. Nemţoi, Gh., Secula, M. S

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Ethanol oxidation reaction at Pd-modified nickel foam obtained by PVD method

-420. DOI: 10.1016/j.seppur.2013.09.030. 21. Xia, X.H., Liess, H.D. & Iwasita, T. (1997). Early stages in the oxidation of ethanol at low index single crystal platinum electrodes. J. Electroanal. Chem. 437, 233-240. DOI: 10.1016/ S0022-0728(97)00404-X. 22. Abd-El-Latif, A.A., Mostafa, E., Huxter, S., Attard, G. & Baltruschat, H. Electrooxidation of ethanol at polycrystalline and platinum stepped single crystals: A study by differential electrochemical mass spectrometry. (2010). Electrochim. Acta 55, 7951. DOI: 10.1016/j.electacta.2010

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Platinum Complexes with Edda (Ethylenediamine -N, N - Diacetate) Ligands as Potential Anticancer Agents

. Wiley: Stuttgart. 5. Rosenberg, B., Van Camp, L., & Krigas, T. (1965). Inhibition of cell division in Escherichia coli by electrolysis products from a platinum electrode. Nature. 205, 698-699. 6. Rosenberg, B., Van Camp, L., Trosko, J.E., & Mansour, V.H. (1969). Platinum compounds - a new class of potent antitumour agents. Nature. 222, 385-386. 7. Burger, H., Loos, W.J., Eechoute, K., Verweij, J., Mathijssenm R.H.J, & Wiemer, E.A.C. (2011). Drug transporters of platinum-based anticancer agents and their clinical

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The feasibility of using compression bioimpedance measurements to quantify peripheral edema

Electrical properties of emulsions In Sherman DH ed Emulsions science 1994 Academic Press London 354 – 477 36 Fung YC. Biomechanics: Mechanical Properties of Living Tissues, 2nd ed. New York, NY: Springer-Verlag; 1993. http://dx.doi.org/10.1007/978-1-4757-2257-4 Fung YC Biomechanics: Mechanical Properties of Living Tissues, 2nd ed New York, NY Springer-Verlag 1993 http://dx.doi.org/10.1007/978-1-4757-2257-4 37 Onaral B, Schwan HP. Linear and nonlinear properties of platinum electrode polarization. Part 1: frequency dependence at very

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An introduction to the memristor – a valuable circuit element in bioelectricity and bioimpedance

titanium dioxide, TiO 2 , layer that was sandwiched between two platinum electrodes and is shown in Figure 1 . As this particular memristor model is as simple as it is illustrative, we will investigate it in what follows and use it to highlight what is typical for memristors. This memristor model is also very similar to the memristance that can be found in electrical measurements of the skin as will be seen later in this paper. An illustration of the HP memristor is shown in Figure 4 . This way of illustrating memristors, as a component separated in two parts, is

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Geometric parameters optimization of planar interdigitated electrodes for bioimpedance spectroscopy

, layers 1 and 2 respectively (top view shown in Figure 6 , 3D view shown in Figure 7 ). A glass layer of length 1300 μm and width of 1300 μm has been defined as a substrate with thickness of 1000 μm to carry the system (layer 1 on Figure 7 ). Glass is a good electrical insulator (10 -17 S⋅m -1 ) with a relative permittivity (around 5-7 [ 19 ]) that is small. As the glass has a very small permittivity, we do not need to put an insulating layer between the substrate and the electrodes. Next, we defined a mask of platinum electrodes (thickness 1 μm), known to be a good

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