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Search results for: bio-ceramics
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An Influence of Factors of Flow Condition, Particle and Material Properties on Slurry Erosion Resistance
PublicationThe degradation of materials due to slurry erosion is the serious problem which occurs in the power industries. The paper presents actual knowledge about an influence of individual factors connected with flow conditions, particles and material properties on the slurry erosion resistance. Among the factors connected with operating conditions, an influence of impact angle, and velocity of impact, particle concertation and liquid...
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Sustainable chemically modified poly(butylene adipate-co-terephthalate)/thermoplastic starch/poly(ε-caprolactone)/cellulose biocomposites: looking at the bulk through the surface
PublicationSustainable polymer composites (or biocomposites) based on renewable and green polymers are progressively under development in a technological paradigm shift from “just use more and more” to “convert into value-added products”. Therefore, significant efforts should focus not only on their reduced environmental impact but also on maximizing their performance and broadening their application range. Herein, the bio-based blends based...
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Polysaccharide nanocomposites in wastewater treatment: A review
PublicationIn modern times, wastewater treatment is vital due to increased water contamination arising from pollutants such as nutrients, pathogens, heavy metals, and pharmaceutical residues. Polysaccharides (PSAs) are natural, renewable, and non-toxic biopolymers used in wastewater treatment in the field of gas separation, liquid filtration, adsorption processes, pervaporation, and proton exchange membranes. Since addition of nanoparticles...
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Selection of material for X-ray tomography analysis and DEM simulations: comparison between granular materials of biological and non-biological origins
PublicationPhysical properties and X-ray tomography images of five different granular materials: glass bead, glass grit, short grain white rice, sorghum and clay granules (Seramis) are investigated to select the most promising materials for numerical simulations and time-lapse X-ray tomography imaging. The examined materials represent granular materials of non-biological origin (glass bead, glass grit and Seramis) and granular plant materials...
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Polyester-urethanes modified with gelatine for tissue scaffolds
PublicationNovel aliphatic PU foams, modified with gelatine, were obtained in a one-step polymerization process. Hard segments were obtained from 1,6-hexamethylene diisocyanate (HDI) and chain extenders 1,4-butanediol (BDO) or 2-(2-(2-hydroxyethoxy)ethoxy)ethanol (TG), soft segments were obtained from poly(ethylene-buthylene adipate) (EBO) polyol. We examined the PU foams for their sorption capability in canola oil, saline (0.9% NaCl water...
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Modification of Ground Tire Rubber—Promising Approach for Development of Green Composites
PublicationGround tire rubber (GTR) was mechano-chemically modified using a road bitumen 100/150 and two types of organic peroxides: di-(2-tert-butyl-peroxyisopropyl)-benzene (BIB) and dicumyl peroxide (DCP). The impact of used additives on reactive sintering efficiency and physico-mechanical properties of modified GTR was investigated using oscillating disc rheometer measurements, followed by tensile tests and swelling behavior studies....
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1,3,4-Thiadiazole-based diamides: Synthesis and complexation properties
PublicationAromatic diamides, derivative of 2,6-pyridinedicarboxylic acid and isophthalic acid, bearing 1,3,4-thiadiazole residue were prepared with satisfactory yields in conventional procedures and microwave stimulated reactions. X-ray structure of N,N-bis (1,3,4-thiadiazol-2-yl)-2,6-pyridinedicarboxamide (2) DMSO solvate (2DMSO) was described. Selective zinc(II), lanthanum(III), terbium(III) and L-tyrosine recognition was found for N,N-bis(1,3,4-thiadiazol-2-yl)-2,6-pyridinedicarboxamide...
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Synteza, struktura chemiczna i właściwości bezizocyjanianowych poliuretanów otrzymywanych z wykorzystaniem CO2 oraz surowców pochodzenia naturalnego.
PublicationZ uwagi na wciąż rosnącą świadomość proekologiczną, politykę zrównoważonego rozwoju, a także nurt zielonej chemii wiodącym trendem w przemyśle tworzyw sztucznych jest poszukiwanie alternatywnych metod otrzymywania materiałów polimerowych. Komercyjnie poliuretany otrzymywane są w wyniku reakcji poliaddycji di- lub poliizocyjanianów z poliolami i małocząsteczkowymi przedłużaczami łańcucha. Z uwagi na niekorzystne właściwości diizocyjanianów,...
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Study of abrasive slurry dosage in flat surfaces lapping process
PublicationPrzedstawiono wyniki badań dozowania pasty i zawiesiny ściernej w procesach docierania powierzchni płaskich. Badano wpływ wielkości dawki ścierniwa na podstawowe parametry chropowatości powierzchni elementów miedzianych i ceramicznych. Docierano miedź betlenową MOOB oraz ceramikę Al2O3 i Al2O3-ZrO2 mikroziarnami węglika krzemu i węglika boru.
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Strategie zarządzania obszarami śródmiejskimi - kwestia przestrzeni handlu
PublicationArtykuł opisuje strategie zarządzania śródmiejskimi przestrzeniami handlu, m. in. Town Centre Management (TCM) jak i Business Improvement Districts (BID). Artykuł zawiera opis genezy strategii oraz głównych zadań przez nie realizowanych (zarządzanie, marketing, estetyzacja, ochrona). Artykuł kończy spojrzenie na alternatywy dla komercyjnych aspektów BID związanych z zarządzeniem śródmieściem jako strategią aktywizacji społecznej.
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Factors Shaping the Working Environment, Living Conditions and Recreation on Board Ship
PublicationA seagoing ship is a working place, an accommodation space and a recreation area at the same time. Being exposed to harsh physical conditions, it must satisfy different requirements. The human organism and its qualities become a point of reference here; consequently, the functions and spatial arrangement and interiors of a ship must be subordinated to its needs. The organisation of the space in contemporary ships meant for human...
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Geometrically Nonlinear Analysis of Functionally Graded Shells Based on 2-D Cosserat Constitutive Model
PublicationIn this paper geometrically nonlinear analysis of functionally graded shells in 6-parameter shell theory is presented. It is assumed that the shell consists of two constituents: ceramic and metal. The mechanical properties are graded through the thickness and are described by power law distribution. Formulation based on 2-D Cosserat constitutive model is used to derive constitutive relation for functionally graded shells. Numerical...
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Investigations on the removal of hydrophobic odorous volatile organic compounds by biotrickling filtration monitored with electronic nose
PublicationThe presented paper presents the results of research on the removal of selected hydrophobic volatile organic compounds (VOCs) from their mixture with air by means of a trickled-bed biofiltration. The efficiency of the removal of toluene and α-pinene, as model VOCs, in a three-section biotrickling filter is evaluated using GCFID and additionally monitored with an electronic nose. The results show that the removal of the model mixture...
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Szlifowanie jednostronne ściernicami o spoiwie niklowym z ziarnami z regularnego azotku boru
PublicationPrzedstawiono wyniki badań eksperymentalnych szlifowania jednostronnego stali stopowej 40H i ceramiki beztlenkowej SSiC z zastosowaniem ściernic o spoiwie niklowym z ziarnami z regularnego azotku boru B107 i B64. Zaprezentowano uzyskane wartości liniowego ubytku materiałowego oraz parametru Ra chropowatości powierzchni. Scharakteryzowano ogólnie zużycie czynnej powierzchni ściernicy.
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Szlifowanie jednostronne ściernicami o spoiwie niklowym z ziarnami z regularnego azotku boru
PublicationPrzedstawiono wyniki badań eksperymentalnych szlifowania jednostronnego stali stopowej 40H i ceramiki beztlenkowej SSiC z zastosowaniem ściernic o spoiwie niklowym z ziarnami z regularnego azotku boru B107 i B64. Zaprezentowano uzyskane wartości liniowego ubytku materiałowego oraz parametru Ra chropowatości powierzchni. Scharakteryzowano ogólnie zużycie czynnej powierzchni ściernicy.
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Wybrane problemy szlifowania powierzchni płaskich z kinematyką docierania
PublicationW pracy przedstawiono teoretyczne i doświadczalne podstawy szlifowania powierzchni płaskich z kinematyką docierania. Dokonano kompleksowej analizy zastosowanych układów kinematycznych szlifierek. Przeprowadzono eksperymenty szlifowania jednostronnego ściernicami o spoiwie galwanicznym z ziarnami diamentowymi (D107, D64 i D46) oraz z regularnego azotku boru (B107 i B64). Innowacyjność ściernic polegała na zróżnicowanym utwierdzeniu...
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Solvation of ionic liquids based on N-methyl-N-alkyl morpholinium cations in dimethylsulfoxide – volumetric and compressibility studies
PublicationThe density and sound velocity of the solutions of ionic liquids based on N-alkyl-N-methyl-morpholinium cations, N-ethyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide, N-butyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide, N-methyl-N-octyl-morpholinium bis(trifluoromethanesulfonyl)imide and N-decyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide in dimethylsulfoxide were measured at T = (298.15 to 318.15)...
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The interplay between Disinhibition and Present-Hedonistic time perspective in the relation between Borderline Personality Organization and depressive symptoms
PublicationThe purpose of the current study was to examine the moderating effect between borderline personality organization (BPO) and depressive symptoms of factors associated with impulsive behavior – Present-Hedonistic time perspective and Disinhibition. The research sample consisted of 720 adults from Poland (518 females), who participated in a survey through the research panel. In the case of low levels of Disinhibition, the positive...
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Lack of magnetoacoustic emission in iron with 6.5% silicon
PublicationZjawisko emisji magnetoakustycznej (EMA) na ogół tłumaczy się dwoma przyczynami: ruchem nie 180-cio stopniowych granic domenowych (1) lub kreacją i anihilacją domen magnetycznych. Artykuł prezentuje silne dowody na poparcie faktu, że to właśnie ruch granic nie 180-cio stopniowych odpowiada za powstawanie efektu EMA. Wynika to z wyników pomiarów dających zerowe natężenie efektu EMA przeprowadzonych dla szerokiego zakresu naprężeń...
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Bezpośrednie inwestycje zagraniczne w biznesie międzynarodowym.
PublicationBezpośrednie inwestycje zagraniczne (BIZ) są nieodzownym elementem biznesu międzynarodowego. Inwestycje te wpływają na rozwój handlu i przyspieszenie rozwoju gospodarczego, stając się ważnym czynnikiem dynamizującym powiązania gospodarcze w skali globalnej. Są niemal zawsze nieodłącznym przejawem działań korporacji transnarodowych. Kształtują rozmiary produkcji międzynarodowej. Bezpośrednie inwestycje zagraniczne stanowiąc dopływ...
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Zastosowanie narzędzi ze spoiwem galwanicznym w mikroszlifowaniu powierzchni płaskich
PublicationW pracy przedstawiono wyniki z badań mikroszlifowania powierzchni płaskich w zmodyfikowanym układzie docierarki jednotarczowej z zastosowaniem narzędzi ze spoiwem galwanicznym. Czynną powierzchnię narzędzia pokryto ziarnami diamentowymi D64 i D107 oraz borazonowymi B64 i B107. Badaniom poddane zostały przedmioty wykonane z ceramiki technicznej o średnicy 34 mm.
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Anion recognition by n,n'-diarylalkanediamides
PublicationThe preparation of N,N'-diarylalkanediamides from respective aliphatic dicarboxylic acidesand 4-nitroaniline via microwave-promoted reactions is presented. The most positive effect of microwave irradiation was observed for N,N'-bis(4-nitrophenyl)butanediamide. Anion binding studies on the obtained diamides were carried out in DMSO and acetonitrile using UV-vis and 1H NMR spectroscopy. A mechanism for selective fluoride recognition...
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Design solution and selected research results of the sea-wave energy converter
PublicationW artykule przedstawiono oryginalne rozwiązanie konstrukcyjne boi do pozyskiwania energii fal morskich oraz analizy i badania modelowe turbiny wodnej poprzedzające wybór ostateczny konstrukcji modelu boi w skali 1:5 przewidzianego do badań eksperymentalnych w basenie holowniczym. Zaprezentowano także wybrane wyniki badań modelowych i symulacji komputerowych ukazujący wpływ systemu kotwiczenia i innych parametrów na jakość i efektywność...
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Resource constrained neural network training
PublicationModern applications of neural-network-based AI solutions tend to move from datacenter backends to low-power edge devices. Environmental, computational, and power constraints are inevitable consequences of such a shift. Limiting the bit count of neural network parameters proved to be a valid technique for speeding up and increasing efficiency of the inference process. Hence, it is understandable that a similar approach is gaining...
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Have you heard about ALAN? Now, there is also ROLAN!
PublicationThis article examines the new ROLAN movement and points out why this might be the next big thing for lighting professionals.
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Cavitation erosion degradation of Belzona® coatings
PublicationIn hydrocarbon and maritime industry there is a constant need of materials and coatings withstanding severe conditions. One of adverse phenomena present there is cavitation erosion. The paper presents evaluation of cavitation resistance of three different steel coatings. Belzona 2141 (ACR-Fluid Elastormer), 1321 (Ceramic S-Steal) and 5831 (ST-Barrier) were deployed on P110 steel and subjected to ultrasound cavitation in distilled...
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Electrophoretic co-deposition of Mn1.5Co1.5O4, Fe2O3 and CuO: Unravelling the effect of simultaneous addition of Cu and Fe on the microstructural, thermo-mechanical and corrosion properties of in-situ modified spinel coatings for solid oxide cell interconnects
PublicationA systematic microstructural, thermo-mechanical and electrical characterization of simultaneous Fe–Cu doped Mn–Co spinel coatings processed by electrophoretic co-deposition on Crofer 22 APU is here reported and discussed. An innovative approach for the simultaneous electrophoretic deposition of three spinel precursors is designed, conceived and optimised, with the aim of outlining time- and energy-saving spinel modification routes....
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Physicochemical properties of rock salt-type ordered Sr2MMoO6 (M=Mg, Mn, Fe, Co, Ni) double perovskites
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Evaluation of 316L porous stainless steel for SOFC support
PublicationW pracy przedstawiono wyniki badań stali typu 316L związanych z zastosowaniem w tlenowych ogniwach paliwowych.
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Coatings for improvement of high temperature corrosion resistance of porous alloys
PublicationPorowate stopy metaliczne są potencjalnymi podłożami nośnymi dla tlenkowych ogniw paliwo. Ich stosowanie obniża cenę ogniw paliwowych, co zaowocuje ich szybszą komercjalizacą. Jednak są one podatne na korozję w wysokich temperaturach. Dotychczas brak jest metod, które mogą poprawić rezystancję korozyjną porotawych stopów w wysokich temperaturach porowatych stopy do zastosowań SOFC. W tym artykule zaproponowano sposób na poprawę...
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Influence of free carbon on the Young's modulus and hardness of polymer‐derived silicon oxycarbide glasses
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Processing of polymer‐derived, aerogel‐filled, SiC foams for high‐temperature insulation
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Elucidating photoluminescent properties of Eu‐doped Ca–Al–Si–O(–N) glasses and the local structures of Eu ions
PublicationEuropium (Eu) ion–doped luminescent materials have attracted considerable attention for their numerous optical applications. Eu-doped Ca–Al–Si–O(–N) glasses were synthesized from a mixture of oxynitride glasses and Eu2O3 powder using a standard melt-quenching technique in a radiofrequency furnace. The source Eu trivalent ions primarily changed to Eu2+ during melting, and the ratio of Eu2+ ions increased with an increase in Eu content...
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Antimony substituted lanthanum orthoniobate proton conductor – structure and electronic properties.
PublicationX‐ray and neutron diffraction have been utilized to analyze the crystalline and electronic structure of lanthanum orthoniobate substituted by antimony. Using X‐ray absorption spectroscopy and photoelectron spectroscopy, changes in the electronic structure of the material upon substitution have been analyzed. The structural transition temperature between fergusonite and scheelite phases for 30 mol% antimony substitution was found...
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Preparation and characterisation of iron substituted Mn1.7Cu1.3-xFexO4 spinel oxides (x = 0, 0.1, 0.3, 0.5)
PublicationSpinel oxides with the general formula Mn1.7Cu1.3-xFexO4 (x= 0, 0.1, 0.3, 0.5) were prepared and evaluated in this work for their properties at high temperatures. The effect of partially substituting Cu by Fe has not been studied so far for this group of materials and is thus evaluated in this work. Mn1.7Cu1.3-xFexO4 powders were synthesised by a soft chemistry process and studied in terms of crystallographic phase analysis, electrical...
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Processing of Ce0.8Gd0.2O2-δ barrier layers for solid oxide cells: The effect of preparation method and thickness on the interdiffusion and electrochemical performance
PublicationCe0.8Gd0.2O1.9 (CGO) barrier layers are required to mitigate the chemical reactions between Sr-containing oxygen electrode materials and Zr-based oxygen ion conductors in high-temperature solid oxide cells. Barrier layers produced by different methods were studied in this work. As a reference, a cell with no barrier layer was measured. The application of the powder-processed barrier layers, considerably increases the performance....
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Electric and magnetic properties of Lanthanum Barium Cobaltite
PublicationThe cubic Ba0.5La0.5CoO3‐δ was synthesized using solid state reaction. The structural properties were determined by the simultaneous refinement of Synchrotron Powder X‐ray Diffraction and Neutron Powder Diffraction data. Iodometric titration was used to examine the oxygen stoichiometry and average cobalt oxidation state. Low‐temperature magnetic studies show soft ferromagnetic character of fully oxidized material, with θP = 198(3)...
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Three electrode configuration measurements of electrolyte-diffusion barrier-cathode interface
PublicationMeasurements of a system consisting of cathode/doped ceria diffusion barrier/doped zirconia electrolyte were made using two- and three-electrode configuration. Results obtained on a three-electrode measurement configuration were compared with and reflect the results obtained in two-electrode configuration. Three-electrode measurements allowed separating the impact of the symmetrical interface in the investigated system. They also...
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CuMn1.7Fe0.3O4 – RE2O3 (RE=Y, Gd) bilayers as protective interconnect coatings for Solid Oxide Cells
PublicationEfficient replacement of materials based on critical elements such as cobalt is one of the greatest challenges facing the field of solid oxide cells. New generation materials, free of cobalt show potential to replace conventional materials. However, these materials are characterized by poor ability to block chromium diffusion. This article described the study of CuMn1.7Fe0.3O4 (CMFO) spinel combined with single metal oxide (Y2O3...
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Structural phase transitions in multicomponent La0.2Nd0.2Sm0.2Gd0.2RE50.2NbO4 (RE5 = Ho, Y, Tb, Eu, Pr) oxides
PublicationIn this work, the influence of compositional complexity on the structural and thermal properties of multicomponent rare-earth ortho-niobates from the La0.2Nd0.2Sm0.2Gd0.2RE50.2NbO4 (RE5 = Ho, Y, Tb, Eu, Pr) series have been investigated. Based on X-ray powder diffraction studies using synchrotron radiation, it was found that all tested materials were pure single-phase compositions and showed stability in the monoclinic I2/c crystal...
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Enhanced acceptor concentration, proton conductivity, and hydration in multicomponent rare‐earth ortho‐niobates
PublicationThe structural properties of (La0.2Nd0.2Sm0.2Gd0.2Eu0.2)1−xCaxNbO4−δ (x = 0–0.05) series have been studied by X-ray powder diffraction at room temperature. The thermal properties were investigated using thermogravimetry, from which the concentration of proton defects was determined. Additionally, dilatometry studies were carried out, from which the thermal expansion coefficients and the phase transition temperature between low-...
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Comparison of Cu1.3Mn1.7O4 spinels doped with Ni or Fe and synthesized via wet chemistry and solid-state reaction methods, designed as potential coating materials for metallic interconnects
PublicationThe influence of the method applied to synthesize Cu-Mn-O spinel was evaluated. The methods selected for the investigation were EDTA gel processes and solid-state reaction synthesis. From the obtained powders, sinters were prepared and assessed in terms of their properties as potential coating materials. Additionally, the influence of Ni and Fe dopants was evaluated. The results show that the EDTA gel processes method seems to...
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La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ oxygen electrodes for solid oxide cells prepared by polymer precursor and nitrates solution infiltration into gadolinium doped ceria backbone
PublicationInfiltration is a method, which can be applied for the electrode preparation. In this paper oxygen electrode is prepared solely by the infiltration of La0.6Sr0.4Co0.2Fe0.8O3‐δ (LSCF) into Ce0.8Gd0.2O2-δ (CGO) backbone. The use a polymer precursor as an infiltrating medium, instead of an aqueous nitrate salts solution is presented. It is shown that the polymer forms the single-phase perovskite at 600 °C, contrary to the nitrates...
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Electrophoretic co-deposition of Fe2O3 and Mn1,5Co1,5O4: Processing and oxidation performance of Fe-doped Mn-Co coatings for solid oxide cell interconnects
PublicationThe “in-situ” Fe-doping of the manganese cobalt spinel was achieved by electrophoretic co-deposition of Mn1,5Co1,5O4 and Fe2O3 powders followed by a two-step reactive sintering treatment. The effects on the coating properties of two different Fe-doping levels (5 and 10 wt.% respectively) and two different temperatures of the reducing treatment (900 and 1000 °C) are discussed. Samples with Fe-doped coatings demonstrated a lower...
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Low temperature deposition of dense MnCo 2 O 4 protective coatings for steel interconnects of solid oxide cells
PublicationIn this work manganese cobalt spinel (MnCo2O4) coatings were deposited on steel substrates by spray pyrolysis at 390 °C. This is at much lower temperatures than previously reported (typically in excess of 900 °C). It was possible to produce coatings with well controlled thickness (2-5-10 μm). The as-deposited coatings were evaluated for their microstructural changes and electrical conductivity up to 800 °C. Results confirm the...
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Fabrication of wormhole-like YSZ and Ni-YSZ by the novel soft-hard template CTAB/NaCl-assisted route. Suppressing Ni coalescence in SOFC
PublicationA novel one-pot synthesis route leading to the formation of a wormhole-like structure was developed for the successful fabrication of porous YSZ and Ni-YSZ systems. This method involved co-precipitation in the presence of the micelle-forming agents CTAB/Pluronic P123 and crystallising NaCl. The obtained skeletons were mechanically stable and presented almost 50% uniform, open porosity without using any additional pore-formers....
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Zagospodarowanie proszku krzemowego, wytworzonego z odzyskanych w procesie recyklingu uszkodzonych ogniw modułów fotowoltaicznych = Utilization of silicon powder, recovered in the PV cell's production and recycling processes
PublicationW artykule przedstawiono wyniki analizy proszku krzemowego różnego pochodzenia i wskazano możliwości technologiczne zagospodarowania proszku krzemowego: jako podstawowego surowca do produkcji nowych ogniw fotowoltaicznych, jako dodatku do stali stopowych, poprawiających ich własności mechaniczne (twardość, wytrzymałość na rozciąganie, udarność) oraz jako materiału do wytwarzania ceramiki, bazującej na proszkach niemetali.
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Niskokoherentny, interferometryczny system do badaniawłaściwości materiałów ceramicznych
PublicationPrzedstawiono światłowodowy system dwuwymiarowej wizualizacjiniejednorodnych struktur warstw ceramicznych. Omówiono projekti fizyczną realizację układu wykorzystującego optyczną, niskokoherentną reflektometrię optyczną, która umożliwia nieinwazyjne i bezkontaktowe obrazowanie wewnętrznych struktur różnych materiałówsilnie rozpraszających promieniowanie. Przedstawiono przykładowewyniki pomiarów wewnętrznych warstw ceramiki LSFO....
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Use of pyridinium and pyrrolidinium ionic liquids for removal of toluene from gas streams
PublicationSeparation of toluene from a toluene/N2 gas mixture using supported liquid membranes based on a series of pyridinium (1-butylpyridinium- bis(trifluoromethylsulfonyl)imide - [C4Py][Tf2N], 1-hexylpyridinium trifluoromethanesulfone [C6Py][Tf2N]) and pyrrolidinium (1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide - [C4Pyrr][Tf2N], 1-hexyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide - [C6Pyrr][Tf2N], 1-butyl-1-methylpyrrolidinium...
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Characterization of PLZT Thin Films for Fast Electro-Optical Sampling Circuits
PublicationW artykule omówiono technologię wytwarzania cienkich warstw wybranych kompozycji ceramik ołowiowo-lantanowo-cyrkonowo-tytanowych, nazywanych ceramikami PLZT. Przedstawiono wyniki badań jakości warstw za pomocą techniki XRD. wyniki pomiaru grubości warstw, ich względnej przenikalności dielektrycznej i współczynnika załamania. Omówiono kierunki dalszych prac.