14 documents found, page 1 of 2
Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic F...
Constantinescu, Gabriel; Mikhalev, Sergey M.; Lisenkov, Aleksey D.; Lopes, Daniela V.; Sarabando, Artur R.; Ferro, Marta C.; Silva, Tiago F. daThis work further explores the possibilities for designing the high-temperature electrical performance of the thermoelectric Ca3Co4O9 phase, by a composite approach involving separate metallic iron and nickel particles additions, and by employing two different sintering schemes, capable to promote the controlled interactions between the components, encouraged by our recent promising results obtained for similar...
Prospects for electrical performance tuning in Ca3Co4O9 materials by metallic F...
Constantinescu, Gabriel; Mikhalev, Sergey M.; Lisenkov, Aleksey D.; Lopes, Daniela V.; Sarabando, Artur R.; Ferro, Marta C.; Silva, Tiago F. daThis work further explores the possibilities for designing the high-temperature electrical performance of the thermoelectric Ca3Co4O9 phase, by a composite approach involving separate metallic iron and nickel particles additions, and by employing two different sintering schemes, capable to promote the controlled interactions between the components, encouraged by our recent promising results obtained for similar...
Alkaline electrochemical reduction of a magnesium ferrospinel into metallic iro...
Lopes, Daniela V.; Lisenkov, Aleksey D.; Sergiienko, Sergii A.; Constantinescu, Gabriel; Sarabando, Artur; Quina, Margarida J.; Frade, Jorge R.The electrochemical reduction of iron oxides in alkaline media arises as a novel approach for ironmaking and iron-rich waste valorisation. Strong advantages and attractive aspects of alkaline electroreduction include lower electric energy consumption, absence of CO2 emissions, and non-polluting valuable by-products such as H2 and O2. Another potential advantage originates from the compatibility of this concept ...
Aluminum anodization in deionized water as electrolyte
Lisenkov, Aleksey D.; Poznyak, Sergey K.; Zheludkevich, Mikhail L.; Ferreira, Mário G. S.Thin oxide films were prepared electrochemically on the aluminum surface using the high-voltage discharge and potentiostatic methods in deionized water as an electrolyte. The growth of continuous films occurred only at potentials lower than the breakdown potential. The films obtained by the discharge method are more uniform and can grow to a higher thickness in comparison to those formed by the potentiostatic m...
Deposition of hydroxyapatite-incorporated TiO2 coating on titanium using plasma...
Ulasevich, Sviatlana A.; Kulak, Anatoly I.; Poznyak, Sergey K.; Karpushenkov, Sergey A.; Lisenkov, Aleksey D.; Skorb, Ekaterina V.A porous hydroxyapatite (HA)–incorporated TiO2 coating has been deposited on the titanium substrate using a plasma electrolytic oxidation coupled with electrophoretic deposition (PEO-EPD). Potassium titanium(IV) oxalate is decomposed by micro arcs generated on the anode producing TiO2 while HA particles have been simultaneously deposited on anode during EPD process. Hydroxyapatite and TiO2 particles have been c...
Photocatalytic Deposition of Hydroxyapatite onto a Titanium Dioxide Nanotubular...
Ulasevich, Sviatlana A.; Poznyak, Sergey K.; Kulak, Anatoly I.; Lisenkov, Aleksey D.; Starykevich, Maksim; Skorb, Ekaterina V.A new effective method of photocatalytic deposition of hydroxyapatite (HA) onto semiconductor substrates is proposed. A highly ordered nanotubular TiO2 (TNT) layer formed on titanium via its anodization is chosen as the photoactive substrate. The method is based on photodecomposition of the phosphate anion precursor, triethylphosphate (TEP), on the semiconductor surface with the following reaction of formed pho...
Aluminum Anodization in Deionized Water as Electrolyte
Lisenkov, Aleksey D.; Poznyak, Sergey K.; Zheludkevich, Mikhail L.; Ferreira, Mario G. S.Thin oxide films were prepared electrochemically on the aluminum surface using the high-voltage discharge and potentiostatic methods in deionized water as an electrolyte. The growth of continuous films occurred only at potentials lower than the breakdown potential. The films obtained by the discharge method are more uniform and can grow to a higher thickness in comparison to those formed by the potentiostatic m...
Deposition of hydroxyapatite-incorporated TiO2 coating on titanium using plasma...
Ulasevich, Sviatlana A.; Kulak, Anatoly I.; Poznyak, Sergey K.; Karpushenkov, Sergey A.; Lisenkov, Aleksey D.; Skorb, Ekaterina V.A porous hydroxyapatite (HA)-incorporated TiO2 coating has been deposited on the titanium substrate using a plasma electrolytic oxidation coupled with electrophoretic deposition (PEO-EPD). Potassium titanium(IV) oxalate is decomposed by micro arcs generated on the anode producing TiO2 while HA particles have been simultaneously deposited on anode during EPD process. Hydroxyapatite and TiO2 particles have been c...
High-pressure zinc oxysulphide phases in the ZnO-ZnS system
Salak, Andrei N.; Ignatenko, Oleg V.; Zhaludkevich, Aliaksandr L.; Lisenkov, Aleksey D.; Starykevich, Maksim; Zheludkevich, Mikhail L.Wurtzite-zincblende mixture, ZnO-ZnS (1:1wt.%), was thermally treated at 5GPa in order to explore a possible mutual solubility of the end members and formation of zinc oxysulphide phases under high pressure. The data on phase content, crystal structure, and microstructure from the X-ray diffraction and the scanning electron microscopy studies of the obtained compacts (ceramics) were compared and analyzed. It wa...
Effect of Surface Treatment on the Performance of LDH Conversion Films
Tedim, João; Zheludkevich, Mikhail L.; Bastos, Alexandre C.; Salak, Andrei N.; Carneiro, Jorge; Maia, Frederico; Lisenkov, Aleksey D.The preparation of layered double hydroxide (LDH) conversion films on aluminum alloy 2024 substrates is reported. The substrates were subjected to four different surface pre-treatments and the corresponding effect on the obtained films studied by scanning electron microscopy (SEM). The corrosion protection conferred to the underlying substrate was investigated by electrochemical impedance spectroscopy (EIS) and...