Materials Literature
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Adsorption and dissociation of CO2 on Fe(100) was studied using temperature programmed desorption, x-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), high-resolution electron energy-loss spectra (HREELS), and low-energy electron diffraction. CO2 adsorbs on Fe(100) at 110 K to form tw…
Work clothes using fabrics with vapor-transmitting characteristics are in limited use in various industrial applications, and there is a growing interest in their purported ability to help reduce heat stress. This study was performed to compare two vapor-transmitting ensembles with other clothing ensembles previously…
Abstract The homopolycondensation of 4‐fluoro‐4′‐trimethylsiloxy(diphenyl sulfone) ( 2 ) in bulk and its cocondensation with 4‐fluoro‐4′‐trimethylsiloxybenzophenone ( 1 ) yielded high‐molecular‐weight, amorphous (co)poly(ether‐sulfone)s. The cocondensation with 4,4′‐difluoro(diphenyl sulfone) ( 4 ) afforded telechelic…
Transparent gas barriers are receiving considerable attention in the plastics industry for roll coating applications. The three principle vacuum deposition processes, evaporation, sputtering and plasma processing are the focus of transparent gas barrier work at various converters, resin producers and equipment manufac…
Abstract Six bis(4-cyano-1-pyridinio) derivatives have been synthesized and deposited onto electrodes by cathodic electropolymerization (ERed = −0.64 — −0.74 V vs. SCE) under basic conditions. The deposited films were constructed of polyviologens that showed characteristic electrochromisms with colorless or slightly y…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-temperature chemical vapor deposition of ruthenium dioxide from ruthenium tetroxide: a simple approach to high-purity RuO2 filmsZheng Yuan, Richard J. Puddephatt, and Michael SayerCite this: Chem. Mater. 1993, 5, 7, 908–910Publication Date (Print):July 1, 1993Publication…
General solutions to the problems of the elastic field perturbation produced by an elliptic inhomogeneity with an adhering or a slipping interface are used to investigate the image glide force exerted on an edge dislocation. Glide equiforce contours are worked out for different values of the relative hardness, the geo…
Abstract Radical ion salts of both chiral (R,R) and racemic organic donor, (Me2ET)2X (Me2ET = trans-dimethylbis(ethylenedithio)tetrathiafulvalene, X = PF6, ClO4, and ReO4) were electrochemically prepared and their crystal structures were analyzed. The donor molecules are stacked in a twist-type column to reduce steric…
NIST is in the process of developing a new scanning electron microscope (SEM) magnification calibration reference standard useful at both high and low accelerating voltages. This standard will be useful for all applications to which the SEM is currently being used, but it has been specifically tailored to meet many of…
Poly( p-phenylene-benzobisoxazole), PBO, is a member of a family of rigid-rod, lyotropic liquid crystal polymers which can be fabricated into fiber, film and composites. PBO exhibits exceptional ignition resistance, low heat release rate, and very low smoke emission. PBO's fire, smoke, and toxicity (FST) properties ar…
The Escherichia coli L-arabinose-binding protein (ABP) participates as a specific receptor in the transport of L-arabinose, D-fucose, and D-galactose through the periplasmic space. The wild-type protein binds L-arabinose about 40 times more strongly than D-fucose. A mutation of the protein at position 108 (Met-->Leu)…
Frequency dependence of the dielectric constant was measured for n-pentyl-p-n-cyanobiphenyl in the nematic phase. Two dielectric relaxations appear. The relaxation at high frequency is due to molecular motion; and the relaxation at low frequency is due to the ion drift, of which the relaxation time can be estimated as…
When a beam of x rays (∼1 keV) impinges on a flat surface at grazing angles (≲3°) the x rays undergo total external reflection. Under these conditions, the penetration depth of the x rays can become comparable to photoelectron escape depths and the photoelectron yields from the surface are enhanced. As the incidence a…
In order to assess the functional properties of the extreme amino-terminal peptide of rat testis fructose-6-phosphate,2-kinase: fructose-2,6-bisphosphatase, 24 and 30 amino acids from the NH2 terminus were deleted using oligonucleotide-directed mutagenesis. The expressed wild-type (WT) and the mutant (Del 24 and Del 3…
Bioresorbable vascular grafts constructed for polyglactin 910 (PG910) and polydioxanone (PDS) and nonresorbable Dacron were interposed into the infrarenal abdominal aortas of New Zealand White rabbits. The prosthesis/tissue complexes were harvested after 2, 3, 4, 12, and 52 weeks. Seventeen, 9, and 1 h prior to sacrif…
In this paper, we describe a new, entirely computer-controlled apparatus designed for degradation studies of photochromic compounds. Photodegradation can be performed in three different ways using, in addition to the usual flash mode, the cyclic and continuous modes which more closely simulate daylight exposure condit…
The effect of SiO 2 on the thermal conductivity of aluminum nitride pressureless sintered with 3 wt% Y 2 O 3 as a sintering aid was investigated. SiO 2 additions greatly decreased the thermal conductivity of the sintered parts from values of around 160 W/m·K on undoped samples to about 25 W/m·K with 5 wt% SiO 2 added…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.pi.-Conjugated soluble poly(6-hexylpyridine-2,5-diyl) and poly(6,6'-dihexyl-2,2'-bipyridine-5,5'-diyl) with high molecular weights and n-type conducting properties. Synthesis, electrical and optical properties, and chemical reactivities of the polymersTsukasa Maruyama, Kenj…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZirconium-assisted homologation of pyrrole to pyridine in the conversion of meso-octaethylporphyrinogen into a meso-octaethyltrispyrrolemonopyridine macrocycle with carbon monoxide and the structure of the first zirconyl complexDenis Jacoby, Carlo Floriani, Angiola Chiesi-Vi…
The effect of CaO on the thermal conductivity of aluminum nitride pressureless sintered with 3 wt% Y 2 O 3 as a sintering aid was investigated. Over the composition range of 0 to 2.0 wt% additions, CaO decreased the thermal conductivity of the sintered parts by 10%. CaO doping rendered the secondary oxide phases more…