Materials Literature
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The role of surface nitrogen in the kinetics of the NO+CO conversion reaction on Rh(111) under steady-state catalytic conditions was explored by using collimated molecular beams and mass spectrometry detection. Two types of kinetically different nitrogen atoms were identified on the surface. The buildup of a critical…
Low temperature plasma treatments of wool modify only the cuticle surface of the fibers, improving their surface wettability, dyeability, fiber cohesion, and shrink resistance. The shrink-resist properties obtained with plasma treatment do not impart a machine-washable finish, which is an important end-user demand. Ho…
A novel neutral nickel complex molecule with the extended TTF dithiolato ligand, propylenedithiotetrathiafulvalenedithiolate [ptdt 2- = (S 8 C 9 H 6 ) 2- ], was synthesized. In the [Ni(ptdt) 2 ] crystal. [Ni(ptdt) 2 ] molecules form one-dimensional columns along the a axis, having short intermolecular transverse S···S…
Delta(5)-3-Ketosteroid isomerase from Pseudomonas testosteroni has been intensively studied as a prototype to understand an enzyme-catalyzed allylic isomerization. Asp(38) (pK(a) approximately 4.7) was identified as the general base abstracting the steroid C4beta proton (pK(a) approximately 12.7) to form a dienolate i…
Dynamic and static light scattering is applied to concentrated suspensions of silica nanoparticles with surface functionalizations causing highly charged or hard sphere interaction potentials, respectively. The index of refraction of the dispersion medium was matched to that of the particles using a mixture of water/g…
Abstract Phenol-formaldehyde polymers and surfactant assembly was structuralized into lamella and disordered mesophases depending on the surfactant/phenol molar ratio at the synthesis.
The syntheses and characterization of two new 1,5-dimethyl-6-oxoverdazyl radicals bearing 2-pyridine and 4,6-dimethyl-2-pyrimidine rings as substituents are described. The radical precursors, the corresponding 1,2,4,5-tetrazanes, were prepared by condensation of the bis(1-methylhydrazide) of carbonic acid with the app…
We have investigated mechanical properties of diamond-like carbon (DLC) thin films, particularly the internal compressive stress and ways to alleviate it. Foreign atoms such as copper, titanium, and silicon were incorporated into the DLC films during pulsed laser deposition. The chemical composition of the doped films…
Using atomic force microscopy (AFM), detailed information on the formation of the nuclei and the growth of the lamellae is obtained. This is the first experimental data that show the appearance and disappearance of embryos, as predicted by thermodynamics. In addition, it is shown that branching is initiated by seconda…
Eight-coordinate gadolinium(III) complexes involving four chelating nitronyl nitroxide ligands have been prepared. An antiferromagnetic Gd(III)−nitroxide coupling is characterized for the first time in these five-spin systems.
We present mode-coupling equations for the description of the slow dynamics observed in supercooled molecular liquids close to the glass transition. The mode-coupling theory (MCT) originally formulated to study the slow relaxation in simple atomic liquids, and then extended to the analysis of liquids composed by linea…
This comparative study addresses the influence of microstructural evolution on mechanical properties of porous alumina sintered with and without the application of uniaxial pressure. A complete set of data on Young's modulus, long‐crack fracture toughness, and fracture strength for two alumina powders as a function of…
Plane-wave pseudopotential calculations of total energies were performed for three ordered perovskite related supercells in each of the eight stoichiometries of ${A(B}_{1/3}{B}_{2/3}^{\ensuremath{'}}){\mathrm{O}}_{3};$ $A=\mathrm{P}\mathrm{b},\mathrm{}\mathrm{Ba},B=\mathrm{Z}\mathrm{n},\mathrm{}\mathrm{Mg}$ and, ${B}^…
Abstract A porphyrin henicosamer was designed, synthesized, and structurally characterized using scanning tunnelling microscopy.
An apparatus for deep-ultraviolet interferometric lithography is described, in which the interfering beams illuminate the substrate through a fused silica prism and a layer of index-matching liquid. The liquid-immersion technique was found to be compatible with a commercially available, chemically amplified photoresis…
Soil properties in central and northeastern British Columbia are strongly influenced by parent materials because of geologically young till, glaciolacustrine, and glaciofluvial deposits. We examined pedogenesis on various parent materials to support studies of long-term forest productivity. We sampled nine pedons deve…
OBJECTIVE: To characterize the proton-magnetic relaxation properties and complexation equilibria of gadobenate dimeglumine and to develop a pharmaceutical formulation for injection. METHODS: Proton-magnetic relaxivities were determined at 20 MHz and 39 degrees C. Metal complexation was studied potentiometrically. Degr…
Thin films of (001)-oriented Sr2FeMoO6 have been epitaxially deposited on LaAlO3 and SrTiO3 (001) substrates. Comparison of their transport and magnetic properties with those of polycrystalline ceramic samples shows a metallic versus semiconductor temperature dependence and a saturation magnetization Ms at 10 K of 3.2…
Dense Si/SiC composites were fabricated via a conventional reaction‐bonding process, using oak charcoal that exhibited a honeycomb structure. The silicon melt was infiltrated into the porous oak charcoal (density of ~0.6 g/cm 3 ) while the sample was heated to 1700°C under vacuum (10 ‐3 torr (~0.133 Pa)), which result…
The high-luminance blue emitting electroluminescent (EL) devices which have been satisfied with the requirement for full color displays were obtained. BaAl 2 S 4 :Eu thin-film EL devices as the new blue emitting EL phosphor was prepared by the two targets pulse-electron-beam evaporation. The maximum luminance level wa…