Temat: plasma oxidation - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Hybrid, bioactive coatings formed on titanium alloys surface
Autorzy:: Kazek-Kęsik, A.
Nosol, A.
Płonka, J.
Krok-Borkowicz, M.
Pamuła, E.
Simka, W.
Tematy:: plasma electrolytic oxidation
titanium alloys
coatings; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Powiązania:: https://bibliotekanauki.pl/articles/283894.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Exploring the potential of biochars for boosting electrocatalytic oxygen evolution reaction
Autorzy:: Stelmachowski, Paweł
Lofek, Magdalena
Wojtasik, Michał
Markowski, Jaroslaw
Opis:: The world's growing energy demand and the necessity of protecting the environment motivate researchers and industry alike to look for an ecological alternative to fossil fuels as energy sources and carriers, such as hydrogen. On the other hand, biomass waste can be used to obtain bio-oil for energy applications. Fast pyrolysis of biomass results in the highest bio-oil yields, but poor physicochemical properties characterise the produced biochar. This work aimed to develop a procedure to make an electrocatalyst of the oxygen evolution reaction (OER) to produce hydrogen based on biochar from fast pyrolysis of renewable raw materials (carbonised triticale straw, sunflower husk, pine sawdust, walnut shells, and sewage sludge) with a cobalt active phase. No additional chemical and thermal valorisation was applied to increase the graphitisation degree, porosity and specific surface area. However, simple and environmentally friendly air plasma was used as a non-destructive method to improve the surface properties of the biochar materials. The cobalt active phase was introduced by a deposition-precipitation method. The surface modification of carbon materials with plasma improves the electrocatalytic activity by changing the speciation of the biochars' surface oxygen groups. The activity of the obtained materials is very similar, irrespective of the different characteristics of the studied fast pyrolysis by-products, indicating that the developed materials can be obtained from various biochars. The OER overpotentials at $10 mA cm^{−2}$ for all the samples are below 385 mV. The most active material, based on plasma-treated triticale straw biochar $(C_{TS}-pl-Co)$, demonstrated the lowest overpotential of 358 mV, representing a slight improvement compared to its untreated counterpart (η = 363 mV). Furthermore, the $C_{TS}-pl-Co$ catalyst maintained stable operation for 6 h at a current density of $18 mA cm^{−2}$, in contrast to the reference cobalt spinel, which operated for only 3 h at a current density of $15 mA cm^{−2}$. These findings underscore the potential of plasma-functionalised waste-derived biochars as sustainable and effective catalysts for OER applications.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: Maximising the potential of reactive carbon support with cobalt active phase for the oxygen evolution reaction
Autorzy:: Darvishzad, Termeh
Stelmachowski, Paweł
Opis:: A growing interest in novel noble metal-free electrocatalysts is fuelled by the pressing need to overcome the drastic demand for sustainable energy sources. To this end, the oxygen evolution reaction (OER) utilising transition metal oxide–carbon composites in alkaline media is considered a robust technology. In many such systems, carbon is used as a conductive additive or support, and the interactions between carbon support materials and the active phase affect the efficiency of the electrocatalyst. Cobalt forms some of the most active and stable electrocatalysts for OER. In carbon-supported systems, the dispersion of the cobalt phase on the carbon surface is a key factor in influencing the catalyst activity in water-splitting reactions. In this study, a low-temperature plasma treatment is used to boost the efficiency of the cobalt active phase by functionalising the carbon support with various oxygen groups. We used a simple deposition–precipitation method to obtain cobalt hydroxide active phase over graphene nanoparticles. The activation of graphene nanoparticles with oxygen plasma allowed us to obtain a catalyst that showed only 317 mV@10 $mA·cm^{−2}$. More importantly, in the series of plasma-activated samples, the OER activity was very high in a range of cobalt phase loadings, yielding a material with 2.4 wt.% of cobalt and an overpotential of only 327 mV@10 $mA·cm^{−2}$. The results indicate that plasma activation of GNP support maximises the usage of the transition metal active phase, which allows for an improvement in area-normalised and a dramatic improvement in the mass-normalised OER electrocatalytic activity.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Plasma Coatings on Aluminium-Silicon Alloy Surfaces
Autorzy:: Długosz, P.
Garbacz-Klempka, A.
Piwońska, J.
Darłak, P.
Młynarczyk, M.
Tematy:: plasma coating
Al-Si alloy
plasma oxidation
anodizing
powłoki plazmowe
stop Al-Si
utlenianie plazmowe
anodowanie; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2079836.pdf Link otwiera się w nowym oknie
Opis:: Plasma oxidation, similarly to anodic oxidation (anodizing), are classified as electrochemical surface treatment of metals such as Al, Mg, Ti and their alloys. This type of treatment is used to make surface of castings, plastically processed products, shaped with incremental methods to suitable for certain requirements. The most important role of the micro plasma coating is to protect the metal surface against corrosion. It is well known that coating of aluminium alloys containing silicon using anodic oxidation causes significant difficulties. They are linked to the eutectic nature of this alloy and result in a lack of coverage in silicon-related areas. The coating structure in these areas is discontinuous. In order to eliminate this phenomenon, it is required to apply oxidation coatings using the PEO (Plasma Electrolytic Oxidation) method. It allows a consistent, crystalline coating to be formed. This study presents the mechanical properties of the coatings applied to Al-Si alloy using the PEO method. As part of the testing, the coating thickness, microhardness and scratch resistance were determined. On the basis of the results obtained, it was concluded that the thickness of the coatings complies with the requirements of conventional anodizing. Additionally, microhardness values exceeded the results obtained with standard methods.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Thermal decomposition integrated with plasma oxidation used for the destruction of selected solid and liquid wastes
Termiczno-plazmowy proces destrukcji wybranych odpadów stałych i ciekłych
Autorzy:: Opalińska, T.
Kowalska, E.
Radomska, J.
Ulejczyk, B.
Tematy:: niszczenie
odpady niebezpieczne
ultlenianie plazmowe
rozkład katalityczny
destruction
plasma oxidation
catalytic decomposition
hazardous wastes; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/256672.pdf Link otwiera się w nowym oknie
Opis:: A new laboratory system for hazardous waste destruction was tested at a laboratory scale. The experimental device consists of 7 units: an electrical furnace, a plasma reactor, a catalytic reactor, a water cooler, a neutraliser, a carbon adsorber and a fan. The experimental system could be built using different units depending on the waste composition with the aim to adopt the system to various kinds of wastes. The first step of the waste degradation was the thermal decomposition in argon flow. The second one was the oxidation of hydrocarbons formed in the first step using non-equilibrium plasma in the presence of oxygen. Finally, the gases leaving the plasma reactor were purified. Two types of wastes (solid and liquid) were degraded. The reduction of the mass of the waste samples was higher than 99%. The carbon dioxide was the main component of the gases that flowed out of the plasma reactor. The carbon oxide and hydrogen were present in these gases too. The condition of the oxidation of the hydrocarbons in the plasma reactor ought to be improved in the future study in order to attain a momentary concentration of CO in the gas stream leaving the experimental system (behind the fan) compatible with obligatory standards.
Skonstruowano i wykonano nowy laboratoryjny układ aparaturowy dla rozkładu odpadów niebezpiecznych. Urządzenie składało się z 7 modułów (elektryczny piec do pirolizy, reaktor plazmowy, reaktor katalityczny, chłodnica, neutralizator, adsorber, wentylator), które mogą być zmieniane i dopasowywane w zależności od rodzaju odpadów. Na pierwszym etapie procesu, odpady ulegają rozkładowi termicznemu w piecu elektrycznym w obecności argonu. Powstałe podczas rozkładu termicznego węglowodory były utleniane w reaktorze plazmowym w obecności tlenu. Następnie gazy opuszczające reaktor plazmowy były oczyszczane. Celem pracy było przetestowanie układu laboratoryjnego w procesie rozkładu dwóch odpadów ciekłego (zużyty olej do pomp próżniowych) i stałego (przeterminowany odczynnik chemiczny - mannit). Redukcja masy próbek obydwu odpadów była wyższa niż 99%. Głównym składnikiem gazów po procesie utlenienia był CO2. W gazach wypływających z reaktora plazmowego występował również CO i H2. Stężenie CO było na tyle znaczące, że należy w przyszłych badaniach polepszyć warunki procesu spalania dla obniżenia tego stężenia.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: PEO layers on Mg-based metallic glass to control hydrogen evolution rate
Autorzy:: Cesarz-Andraczke, K.
Kazek-Kęsik, A.
Tematy:: amorphous magnesium alloys
corrosion rate
plasma electrolytic oxidation
hydrogen evolution; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200823.pdf Link otwiera się w nowym oknie
Opis:: The amorphous Mg-based alloys may be used as metallic biomaterials for resorbable orthopedic implants. The Mg-Zn-Ca metallic glasses demonstrate variable in time degradation rate in simulated body fluid. In this work the Mg66Zn30Ca4 alloy was chosen as a substrate for coatings. This paper reports on the surface modification of a Mg66Zn30Ca4 metallic glass by plasma electrolytic oxidation (PEO). The structure characterization of uncoated Mg66Zn30Ca4 alloy was performed by using TEMand XRD method. The immersion tests of coated and uncoated Mg66Zn30Ca4 alloy were carried out in Ringer’s solutionat 37°C. The volume of released hydrogen by immersion tests was determined. The coatings structure and chemical composition after immersion tests by SEM/EDS were studied. Based on SEM images of surface structure samples, immersion tests results and hydrogen evolution measurement was proposed the course of corrosion process in Ringer’s solution for Mg-based metallic glasses with PEO coating. Results of immersion tests in Ringer’s solution allowed to determine the amount of evolved hydrogen in a function of time for Mg66Zn30Ca4 metallic glass and sample with PEO coating. In comparison to the non-coated Mg66Zn30Ca4 alloy, the sample with PEO layer showed a significantly decreased hydrogen evolution volume.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Plasma electrolytic oxidation of a Ti-15Mo alloy in silicate solutions
Autorzy:: Michalska, Joanna
Osyczka, Anna
Simka, Wojciech
Krząkała, Agnieszka
Maciej, Artur
Tylko, Grzegorz
Babilas, Dorota
Socha, Robert P.
Służalska, Katarzyna
Dercz, Grzegorz
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 8.

Tytuł:: The effect of electrolyte composition on the plasma electrolyte oxidation and phase composition of oxide ceramic coatings formed on 2024 aluminium alloy
Autorzy:: Posuvailo, V. M.
Kulyk, V. V.
Duriagina, Z. A.
Koval’chuck, I. V.
Student, M. M.
Vasyliv, B. D.
Tematy:: microstructure
hydrogen peroxide
porosity
plasma electrolyte synthesis
plasma electrolyte oxidation
mikrostruktura
nadtlenek wodoru
porowatość; Pokaż więcej
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Powiązania:: https://bibliotekanauki.pl/articles/1818491.pdf Link otwiera się w nowym oknie
Opis:: Purpose: Purpose of this work is to analyse the process of synthesis of oxide ceramic coatings in plasma electrolytes on 2024 aluminium alloy and to form an electrolyte which allows to reduce energy consumption for the coating formation. Design/methodology/approach: The oxide ceramic coatings were synthesized on 2024 aluminium alloy. The coatings were formed by the alternate application of anode and cathode pulses to the sample. X-ray diffraction analysis of coatings was performed on a DRON-3.0 X-ray diffractometer using CuKa radiation. The thickness of the coatings was determined using a CHY TG-05 thickness gauge. The porosity of the coatings was investigated by analysing the micrographs of the plasma electrolyte oxidation (PEO) coatings obtained on a scanning electron microscope at x500 magnification using the image processing technique. Findings: The electrolyte with 5 g/l H2O2 additive have been elaborated as an optimal composition for synthesis of a coating with an increased content of corundum (a-Al2O3) as compared to a coating synthesized in the same mode in the 3KOH+2Na2SiO3 electrolyte without H2O2. This synthesis mode allows obtaining a coating with a high corundum content at low energy consumption. Research limitations/implications: For further optimization of the synthesis modes, it is necessary to analyse the influence of the phase composition and porosity of the obtained oxide ceramic coatings on their microhardness, wear resistance, and corrosion resistance. Practical implications: Based on the developed modes of synthesis of the coatings, it will be possible to obtain wear and corrosion resistant oxide ceramic coatings with predetermined functional properties and to reduce energy consumption for their formation. Originality/value: Methods for accelerating the formation of coatings have been proposed and tested, in particular, by adding various amounts of hydrogen peroxide to the electrolyte. The content of oxides in the obtained coatings, in particular, their ratios at various concentrations of hydrogen peroxide in the electrolyte, were determined by X-ray phase analysis. The modes of synthesis of the coatings were developed which allow obtaining a continuous coating without cracks with simultaneous decreasing porosity from 4.32% to 3.55-3.53%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Physico-chemical and biological evaluation of doxycycline loaded into hybrid oxide-polymer layer on TiMo alloy
Autorzy:: Student, Sebastian
Simka, Wojciech
Kazek-Kęsika, Alicja
Brzychczy-Włoch, Monika
Śmiga-Matuszowicz, Monika
Płonka, Joanna
Pamuła, Elżbieta
Krok-Borkowicz, Małgorzata
Nosol, Agnieszka
Opis:: Oxide-polymer coatings were formed on the surface of the vanadium-free Ti-15Mo titanium alloy. The Ti alloy surface was modified by the plasma electrolytic oxidation process, and then, the polymer layer of a poly (D, Llactide- co-glycolide) with doxycycline was formed. The polymer evenly covered the porous oxide layer and filled some of the pores. However, the microstructure of the polymer surface was completely different from that of the PEO layer. The surface morphology, roughness and microstructure of the polymer layer were examined by scanning electron microscopy (SEM) and a confocal microscope. The results confirmed the effectiveness of polymer and doxycycline deposition in their stable chemical forms. The drug analysis was performed by highperformance liquid chromatography. The $^{1}$H NMR technique was used to monitor the course of hydrolytic degradation of PLGA. It was shown that the PLGA layer is hydrolysed within a few weeks, and the polyglycolidyl part of the copolymer is hydrolysed to glycolic acid as first and much faster than the polylactide one to lactic acid. This paper presents influence of different microstructures on the biological properties of modified titanium alloys. Cytocompatibility and bacterial adhesion tests were evaluated using osteoblast-like MG-63 cells and using the reference S. aureus and S. epidermidis strains. The results showed that the optimum concentration of doxycycline was found to inhibit the growth of the bacteria and that the layer is still cytocompatible.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: Plasma Electrolytic Oxidation as a modern method to form porous coatings enriched in phosphorus and copper on biomaterials
Autorzy:: Rokosz, Krzysztof
Hryniewicz, Tadeusz
Tematy:: Plasma Electrolytic Oxidation (PEO)
Niobium
Ti6Al4V
TNZ
Porous coatings; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1190116.pdf Link otwiera się w nowym oknie
Opis:: In the paper, the porous coatings obtained on niobium and two titanium alloys (Ti6Al4V, and TNZ) after Plasma Electrolytic Oxidation (PEO), known also as Micro Arc Oxidation, were studied. The samples were treated at the voltage of 450 V for 3 minutes in the electrolyte consisting of 300 g and 600 g of copper nitrate Cu(NO3)2 in 1 litre of concentrated phosphoric acid H3PO4, consecutively. SEM and EDS studies were performed on the samples. Based on the obtained results it may be concluded that enriched in copper porous coatings on all studied materials were created in the electrolyte within copper nitrate amounting for 600 g. The proposed by the Authors factor to evaluate the obtained coatings, i.e. copper-to-phosphorus ratio, which for the studied materials amounted to 0.21, clearly indicates that the performed electrochemical PEO treatment for surface modification especially of bioimplants may be advised.
Dostawca treści:: Biblioteka Nauki

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