Materials Literature
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A comprehensive study on the hydrogen etching of numerous SiC polytype surfaces and orientations has been performed in a hot wall CVD reactor under both atmospheric and low pressure conditions. The polytypes studied were 4H and 6H-SiC as well as 3C-SiC grown on Si substrates. For the hexagonal polytypes the wafer surf…
The Paleocene-Eocene boundary was a period of transient and intense global warming that had a deep effect on middle and high latitude plant groups. Nevertheless, only scarce early Paleogene paleoclimatic records are known from the South American continental sequences deposited at these latitudes. In this contribution…
A highly efficient and colour-stable three-wavelength white organic light-emitting diode with the structure of indium tin oxide (ITO)/MoO3/N,N'-diphenyl-N,N'-bis (1-naphthylphenyl)-1,1'-biphenyl-4,4'-diamine (NPB)/4,4'-N,N'-dicarbazole-biphenyl (CBP): bis(2,4-diphenylquinolyl-N,C-2') iridium( acetylacetonate) (PPQ)(2)…
Stiffened panels in ships and offshore oil platforms are provided with circular openings for repair, access and maintenance. This paper presents the numerical study carried out on the ultimate strength of stiffened panel with central circular opening subjected to axial load, lateral load and a combination of axial and…
The synthesis of poly(N-vinylcarbazole)-based block copolymers functionalized with rhenium diimine complexes or pendant terpyridine ligands is reported. The copolymers are synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization, and they exhibit interesting morphological properties as a r…
We have studied different Schottky and ohmic contacts on 4H-SiC with the aim to obtain Schottky barrier diodes (SBDs) capable to operate at high temperatures, frequencies and power densities for long periods of time, and showing low power losses. The control of the Schottky barrier plays an important role in minimizin…
Ash containing considerable amounts of free lime as the most active component requires stabilization to assure safe landfilling. Using CO2 from flue gases as a neutralizing agent, also the emission of CO2 is diminished. The most extensive effect could be achieved by treating ash-water suspensions with CO2-containing…
Synthetic nanoplatelets derived from α-zirconium phosphate (α-ZrP) were prepared for in situ propylene polymerization, yielding polypropylene (PP) nanocomposites. The designed α-ZrP-derivatives contain methyl groups on the surface to increase hydrophobicity, which gives rise to a better compatibility with toluene and…
Using a molecular dynamics model the crystallinity of Mg x Al y O z thin films with a variation in the stoichiometry of the thin film is studied at operating conditions similar to the experimental operating conditions of a dual magnetron sputter deposition system. The films are deposited on a crystalline or amorphous…
The authors report on the resistive switching effect in YBa2Cu3O6+x/Nb-doped SrTiO3 heterojunctions. The current-voltage curves of these heterojunctions show hysteresis, which increases with decreasing temperature and oxygen content. Multiresistance states are realized by voltage pulses with different amplitudes. The…
Studies have shown that hydrophilic surfaces of ceramic membranes can be modified to be hydrophobic using a grafting method. In this study, a robust and hydrophobic ceramic hollow-fiber membrane was developed by introducing a pretreatment technique, followed by a grafting method. The contact angle of the grafted membr…
Epitaxial layers were grown on 4° off-axis 4H-SiC substrates by hot-wall chemical vapor deposition. The reduced off-cut angle resulted in lower basal plane dislocation (BPD) densities. The dependence of BPD reduction on growth conditions was investigated using ultraviolet photoluminescence (UVPL) imaging. With this me…
In this letter, we demonstrate that by blending insulating polymers, one can fabricate an insulating layer with controllable surface energy for organic field-effect transistors. As a model system, we used copper phthalocyanine evaporated on layers of polymethyl metacrylate blended with polystyrene with different blend…
A series of five uranyl diphosphonates with pillared and canted pillared structures have been prepared and characterized. These compounds are constructed from UO(6) tetragonal bipyramids and UO(7) pentagonal bipyramids that are bridged by the diphosphonate anions. All of these compounds fluoresce at room temperature.
A novel technique for fabrication of patterned and aligned polymer-nanowire/micro-and nanotube (PNW/PNT) arrays on a wafer-level substrate of any material is reported. By creating a designed pattern on a spin-coated polymer film using techniques, such as stamping or micro-tip writing, plasma etching results in the for…
Ferrous glycinate liposomes were prepared by reverse phase evaporation method. The effects of cholesterol, Tween 80, ferrous glycinate concentration, hydrating medium, pH of hydrating medium, and sonication strength on the encapsulation efficiency of liposomes were investigated. Encapsulation efficiency was significan…
The pincer-type complexes (PC(sp3)P(i-Pr))NiR (PC(sp3)P(i-Pr) = (i-Pr(2)PCH(2)CH(2))(2)CH) react with HBF(4) (R = C[triple bond]CMe, Ph, Me) or AgBF(4) (R = Br) to give (PC(sp3)P(i-Pr))Ni(BF(4)), 1, which was found to involve fluxional Ni-F-BF(3) interactions. Competition experiments revealed that the relative ease of…
Micrometres-sized titanium particles were deposited on a steel substrate by kinetic spraying at an impact velocity of about 760 m s−1, and the bonding between titanium and steel was characterized by high-resolution electron microscopy. A thin interfacial layer composed of titanium, oxygen and iron was identified betwe…
Lead-free solders have been adopted by the microelectronics industry. However, their thermomigration behaviors are unclear. Thermomigration in eutectic SnAg3.5 solder joints was investigated using an alternating current (ac) of 0.57 A at 100 °C. The ac eliminates the electromigration effect and creates a thermal gradi…
3,4-Dimethoxytellurophene (5) was synthesized via a new ring construction reaction. The crystal structure of 5 is characterized by unusually short Te...Te distances. The electropolymerization of 5 probably produces some amount of poly-5. Since the product was unstable under experimental conditions, a definitive assign…