Search results for "engineering.material"
showing 10 items of 2352 documents
Density functional theory description of random Cu-Au alloys
2019
Density functional alloy theory is used to accurately describe the three core effects controlling the thermodynamics of random Cu-Au alloys. These three core effects are exchange correlation (XC), ...
Atomically Precise Nanocluster Assemblies Encapsulating Plasmonic Gold Nanorods.
2018
The self-assembled structures of atomically precise, ligand-protected noble metal nanoclusters leading to encapsulation of plasmonic gold nanorods (GNRs) is presented. Unlike highly sophisticated DNA nanotechnology, this strategically simple hydrogen bonding-directed self-assembly of nanoclusters leads to octahedral nanocrystals encapsulating GNRs. Specifically, the p-mercaptobenzoic acid (pMBA)-protected atomically precise silver nanocluster, Na4 [Ag44 (pMBA)30 ], and pMBA-functionalized GNRs were used. High-resolution transmission and scanning transmission electron tomographic reconstructions suggest that the geometry of the GNR surface is responsible for directing the assembly of silver …
Mechanical and cohesion properties of brass plated steel cords in a sulphurizing environment
1986
The mechanical and cohesion properties of brass plated steel cords have been investigated in dry hydrogen sulphide between 25 and 450° C. The extents of elastic and plastic regions, obtained from slow strain rate technique data have been defined, and the preferential site of decohesion tends to be the brass-steel interface.
Inhibitoren der Korrosion 17(1) Die Bedeutung des „Hart-Weich-Konzepts” von Pearson für die Erkennung von Struktur-Wirkungsbeziehungen von Inhibitore…
1974
Ausgehend von einem fruher veroffentlichten Postulat, wonach das Hart-Weich-Konzept von Pearson die Grundlage zur Auffindung von Inhibitoren fur spezifische Anwendungen sein kann, wird mit Hilfe von Modell-inhibitoren mit „harten„funktionellen Gruppen gezeigt, das sich tatsachlich bestimmte Beziehungen zwischen der Struktur und der Wirkung von Inhibitoren ableiten lassen. Als harte Gruppen wurden die Phosphorylgruppe −P(O)O und die Carbonylgruppe CO verwendet. Es zeigt sich dabei, das derartige Verbindungen in der Lage sind, auf Eisen sehr stabile und schutzende Deckschichten zu bilden, wobei die Wirksamkeit der Inhibitoren mit der Lange der aliphatischen Kette deutlich zunimmt. Wie elektro…
Über Inhibitoren der Korrosion II. Versuche zur Additivität von K- und A-Inhibitoren an Eisen Der Einfluß von Fremdionen auf die Schutzwerte von K-In…
1964
Die Oniumhypothese und der Begriff des „K- und A-Inhibitors” werden erlautert. Mogliche Wechselwirkungen der K- und A-Inhibitoren mit der Metalloberflache werden diskutiert. K- und A-Inhibitoren verhalten sich im Kombinationsversuch mindestens additiv, haufig uberadditiv. Geloste Fremdmetallionen erhohen in der Reihenfolge: Die Schutzwirkung der K-lnhibitoren. Geringe Konzentrationen an FeIII-lonen verstarken, hohere Konzentrationen erniedrigen die Schutzwirkung. Der Einflus von FeII-lonen ist gering und wenig won der Konzentration abhangig. On corrosion inhibitors II: Research on the additivity of K and A inhibitors on iron The influence of impurity ions on the protection characteristics o…
Inhibitoren der Korrosion 20(1)-Über die zeitliche Abhängigkeit der analytischen Zusammensetzung der Korrosionsprodukte des Eisens von der Menge an v…
1977
Mit einer modifizierten Analysenmethode ist es moglich, Gemische mit Fe0, Fe2+ und Fe3+ zu analysieren. Diese Methode wird zur Untersuchung von Systemen mit chloridkatalysierter Korrosion benutzt. Nach den Ergebnissen ist die Fe2+-Menge bei Ph 7 unabhangig von der verbrauchten Sauerstoffmenge annahernd konstant, da Fe0 zu Fe2+ und dieses weiter zu Fe3+ oxidiert wird. Die Geschwindigkeiten dieser Reaktionen sind vergleichbar. Bei pH 3 erhalt man nur Fe2 und ab pH 4 wird Fe3+ vorherrschen. Analytical composition of the corrosion products of iron as a function of time and of the oxygen consumed Using a modified standard method of analysis it is possible to analyze mixtures containing Fe0, Fe2+…
Increased photocatalytic activity and selectivity towards methane of trimetallic NiTiAl-LDH
2022
Layered double hydroxides is a rising family of materials with interesting photocatalytic properties that are starting to be employed on the CO photoreduction to useful chemicals. However, the selectivity control towards high energy value products, such as methane or methanol, is one of the main issues of this process due to the easier formation of CO, which requires fewer electrons to be transferred, and the competition of hydrogen evolution reaction. In this work, a new LDH material containing Ni, Ti and Al within the structure was synthesised with the purpose of increasing the selectivity towards methane production. The material was tested under solar simulator conditions, yielding a met…
Efficient Semitransparent Perovskite Solar Cells Based on Thin Compact Vacuum Deposited CH3NH3PbI3 Films
2022
Lead halide perovskite materials are promising candidates for the application of semitransparent solar cells due to their bandgap tunability and high device efficiencies. The high absorption coefficient of these materials, however, makes it difficult to attain high average visible transmittance values without compromising the power conversion efficiencies (PCEs). In this work, a co-evaporation process is employed to fabricate thin (50 and 100 nm) methylammonium lead iodide (MAPI) perovskite films and integrate them in semitransparent perovskite solar cells (ST-PSCs). Due to the compact nature of the thin MAPI films, the resultant fully vacuum and room temperature-processed devices demonstra…
Combinatorial Vacuum-Deposition of Wide Bandgap Perovskite Films and Solar Cells
2022
The development of vacuum-deposited perovskite materials and devices is partially slowed down by the minor research effort in this direction, due to the high cost of the required research tools. But there is also another factor, thermal co-deposition in high vacuum involves the simultaneous sublimation of several precursors with an overall deposition rate in the range of few Å s−1 . This leads to a deposition time of hours with only a single set of process parameters per batch, hence to a long timeframe to optimize even a single perovskite composition. Here we report the combinatorial vacuum deposition of wide bandgap perovskites using 4 sources and a non-rotating sample holder. By using sm…
Study of Uptake Mechanisms of Halloysite Nanotubes in Different Cell Lines
2021
Giuseppa Biddeci,1,2 Gaetano Spinelli,1 Marina Massaro,2 Serena Riela,2 Paola Bonaccorsi,3 Anna Barattucci,3 Francesco Di Blasi1 1Institute for Innovation and Biomedical Research (IRIB), CNR, Palermo, 90146, Italy; 2Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), Sect. Chemistry, University of Palermo, Palermo, 90128, Italy; 3Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, 98158, ItalyCorrespondence: Francesco Di BlasiInstitute for Innovation and Biomedical Research (IRIB), CNR, Via Ugo La Malfa 153, Palermo, 90146, ItalyTel +39 0916809514Email francesco.diblasi@irib.cnr.itPurpose: Hal…