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.
Edyta Andrysewicz, Joanna Mystkowska, Jan Ryszard Dąbrowski, Ewa Och, Katarzyna Skolimowska and Marcin Klekotka
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.
Paul C. Vereștiuc, Oana-Maria Tucaliuc, Iuliana G. Breabăn, Igor Crețescu and Gheorghe Nemțoi
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Tomasz Mikołajczyk, Marcin Turemko and Bogusław Pierożyński
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Milena Jurisevic, Gordana Radosavljevic, Aleksandar Arsenijevic, Marija Milovanovic, Nevena Gajovic, Dragana Djordjevic, Jelena Milovanovic, Bojana Stojanovic, Aleksandar Ilic, Tibor Sabo and Tatjana Kanjevac
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Leo Koziol, John J. Pitre, Joseph L. Bull, Robert E. Dodde, Grant Kruger, Alan Vollmer and William F. Weitzel
Electrical properties of emulsions In Sherman DH ed Emulsions science 1994 Academic Press London 354 – 477
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37 Onaral B, Schwan HP. Linear and nonlinear properties of platinumelectrode polarization. Part 1: frequency dependence at very
titanium dioxide, TiO 2 , layer that was sandwiched between two platinumelectrodes 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
, 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 platinumelectrodes (thickness 1 μm), known to be a good