Materials Literature
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Aqueous fluoride solutions underpin much of silicon processing because they are used to strip oxide layers and for cleaning. Depending on their composition and reaction conditions they can be used to create either flat, hydrogen-terminated surfaces or nanocrystalline porous silicon. Nonetheless, confusion reigns regar…
To promote a better understanding of failure behavior of high burnup PWR fuel rods during reactivity initiated accidents (RIAs), tube burst tests have been performed with artificially hydrided Zircaloy-4 specimens at room temperature and at 620 K. Pressurization rate was increased to a maximum of 3.4 GPa/s in order to…
The degradation mechanism of the La-Mg-Ni-based hydrogen storage electrode alloy La 0.7 Mg 0.3 Ni 3.4 Mn 0.1 during charge/discharge cycling has been systematically studied using X-ray diffraction, X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), scanning electron microscopy (SEM), electroche…
We perform first-principles calculations to investigate the structure of spinel-type gallium oxynitrides (γ-galons) as well as their formation from and relative stability to the binary phases gallium oxide (Ga2O3) and gallium nitride (GaN). Besides the ideal cubic γ-galon Ga3O3N with a content of 50 mol% GaN, we study…
Abstract The entropically‐driven ring‐opening polymerization of macrocyclic monomers (> ca . 14 ring atoms per repeat unit) and/or macrocyclic oligomers is a relatively new method of polymer synthesis that exploits the well‐known phenomenon of ring‐chain equilibria. It attracts interest because of its novel feature…
Two monomeric, six-coordinated magnesium complexes with bulky aminophenolate ligands [(Htbpoa)2Mg] (1) and [(Htbpca)2Mg(THF)2] (2), where Htbpoa =N-[methyl(2-hydroxy-3,5-di-tert-butylphenyl)]-N-methyl-N-methyl-1,3-dioxolaneamine and Htbpca =N-[methyl(2-hydroxy-3,5-di-tert-butylphenyl)]-N-methyl-N-cyclohexylamine have…
The supramolecular assembly of tin(IV) porphyrin equipped with six pyridyl groups, trans-diisonicotinate[meso-tetrakis(4-pyridyl)porphyrinato]tin(IV), generates a uniform channel lined with the pyridyl groups, in which the lattice water molecules are ordered into a single-file chain by hydrogen bonding between neighbo…
Reduced-activation ferritic/martensitic (RAF/M) steels have been considered to be the prime candidate for the fusion blanket structural material. The irradiation data obtained up to now indicates rather high feasibility of the steels for application to fusion reactors because of their high resistance to degradation of…
The new paramagnetic molecular superconductor ET4[(H3O)Fe(C2O4)3]·C6H5Br (1) (Tc = 4.0 K) contains layers of superconducting ET donors alternating with paramagnetic hexagonal layers formed by (H3O)+, [Fe(C2O4)3]3− and guest C6H5Br molecules located in the hexagonal cavities. Conductivity measurements show metallic beh…
Immersion of stainless steel containing a well-controlled density of MnS inclusions in 1 M NaCl, pH 3 leads to the chemical dissolution of these heterogeneities. This process was studied using in situ atomic force microscopy and the dissolution rate of MnS inclusions was estimated between 0.01 and 0.19 μ m 3 ∕ min . T…
Pure platinum is too soft to be used for jewellery and scratches easily. Alloying platinum increases its hardness significantly. However, platinum alloys used in jewellery do need to be easy to work and thus the alloy should be sufficiently soft, but not so soft that their wear resistance is low. A good compromise wou…
This paper describes a new approach to the controllable fabrication of macroporous silver frameworks with various structures and shapes by calcination of Ag nanoparticle–polymer pastes which were mediated by the differently organized linear poly(ethyleneimine) (PEI) hydrogels and silver ions without extra reductant. T…
Electrochemical behavior of the bare indium-tin oxide (ITO) electrode in 1 M NaOH electrolyte has been studied in a wide range of current density and applied charge in view of its possible application as a counterelectrode in rare earth optical windows. Nature and kinetics of both cathodic and anodic processes develop…
Syntheses of CdSe/ZnTe/ZnS (core/shell/shell) type-II quantum dots (QDs) are reported. Structural characterization was made via TEM, EDX, XPS and XRD. Photophysical properties were investigated via the interband emission (CdSe → ZnTe) and its associated quantum efficiency as well as relaxation dynamics. In comparison…
Theoretical investigation with Monte Carlo simulations predicts that thermal spin-switching hysteresis of transition-metal complexes appears even in nanoparticles, but the hysteresis width does not depend only on the interaction strength between molecules but also strongly on the shape and size of the particles.
The effect of polarization treatment on the interface between (LSM) cathode and (YSZ) electrolyte in solid oxide fuel cells has been studied by electrochemical impedance spectroscopy and atomic force microscopy. It has been found that the polarization has a significant effect not only on the electrocatalytic activitie…
Nanopositioning is one of the most intriguing challenges in nanoelectronics and photonics. As the optoelectronic circuit components become more and more complex, the importance of nanopositioning becomes critical. For example, in single-mode fiber telecommunications it is easy to show that an alignment deviation as sm…
A nanosensor technology has been developed using single-walled carbon nanotubes (SWNTs) combined with silicon-based microfabrication processes. A sensor array containing twelve interdigitated electrode (IDE) pairs with different gap sizes has been designed. The IDE fingers were fabricated using photolithography and th…
Porphine bearing triphenylamine (TPA) pendant groups and their zinc complexes, zinc meso-tetra-p-(di-p-phenylamino)phenylporphyrin (ZnTDPAPP) and zinc meso-tetra-p-(di-p-tolylamino)phenylporphyrin (ZnTDTAPP) are synthesized and their spectral and electrochemical characteristics are studied. Zinc meso-tetraphenylporphy…
Solution properties of complexes of a new H 4 dota-like ligand containing three acetate and one methylphosphonate pendant arms (H 5 do3ap, H 5 L) were studied. The ligand exhibits a high last dissociation constant (p K A = 13.83) as a consequence of the presence of phosphonate moiety. In solution, successive attachmen…