Materials Literature
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Polycondensation of dimethyl 2,6-anthracenedicarboxylate and aliphatic diols provides poly(alkylene 2,6-anthracenedicarboxylate)s, PxA. The ethylene homologue, P2A, an analog of PET and PEN (two commodity polyesters), is infusible and insoluble. Polymers prepared from other short diols (1,4-butanediol, 1,6-hexanediol)…
On pyrrole! The pyrrole-based corrole ligands can offer an alternative to porphyrin systems. The manganese corroles 1–4 are readily synthesized, undergo metal- not ligand-based redox chemistry, and 4 in particular shows impressive catalytic activity in the oxygenation of styrene with iodosylbenzene.
Passy, S. I. Department of Biology, Rensselaer Polytechnic Institute c/o US Geological Survey, 425 Jordan Rd., Troy, NY 12180‐8349 USA On August 27, 1999, diatoms were sampled and current velocity and depth were measured on a regular square sampling grid at 81 locations in an unshaded, cobble‐bottom reach of White Cre…
Abstract Structure development in the softening/melting processing regime is investigated using the model miscible blend poly(styrene‐co‐acrylonitrile) (SAN)/poly(methyl methacrylate) (PMMA). Feed materials of four different particle sizes are compounded to study their effects upon structure development. Fourier‐trans…
We present what we believe is a new hybrid objective consisting of a gradient-index optical element that has external flat refracting surfaces and is made of two different inhomogeneous materials separated by a cemented spherical surface. Microstructures of diffractive lenses are placed on the flat external surfaces o…
The cathodic polarization of Ni in hydrochloric acid solutions has been investigated using the galvanostatic technique. The rate of hydrogen evolution reaction was found to depend on the concentration and pH of the solution. The reaction order with respect to hydrogen ion was found to be one. The rise of temperature e…
The 1 H NMR spectra of the five-coordinated rhodium phthalocyanine complex Me ( RPc ) Rh (III) (1, RPc = dianion of 1,4,8,11,15,18,22,25-octa-n-pentylphthalocyanine) in toluene indicate that it exists as a discrete monomer at low concentrations. The complex forms a dimer aggregate reversibly in the concentration range…
Silver-based multilayer coatings are well known to be transparent films with low electrical resistivity. In particular, indium and zinc composite oxide (IZO)/silver containing palladium (AgPd) multilayer coatings have good pattering properties and durability. However, the IZO/AgPd multilayer coatings do not have suffi…
With the aim of producing polyhydroxyalkanoates, a study of the influence of culture conditions (nitrogen and carbon sources and temperature) on the growth of Ralstonia eutropha in stirred flasks was carried out and the use of some low-cost sources (hydrolyzed lactose, inverted sugar and corn steep liquor) as evaluate…
The Faraday effect spectra were measured in La 0.7 Sr 0.3 MnO 3−δ films. A band attributed to d-d transitions 4 A 2 g - 4 T 2 g in Mn 4+ ions or octahedral complexes (MnO 6 ) 8− was observed in the spectral region of ∼2.7 eV. The position and value of the maximum of the Faraday rotation band and the figure of merit we…
A new thermoluminescence glow curve deconvolution (GCD) function is introduced which accurately describes second order thermoluminescence (TL) curves. The logistic asymmetric (LA) statistical probability function is used with the function variables being the maximum peak intensity (Im), the temperature of the maximum…
This paper aims to show different ways the original surface of archaeological metal artefacts can be preserved in the corrosion products. Depending on the corrosion mechanism, the original surface can be located owing to some features that can be used as clues. These feature include the remains of metallurgical struct…
Abstract We have developed new Wide‐band Retardation Films (WRF) by using molecular design technologies, and started to manufacture them. The single retardation film has reverse wavelength dispersion, which means a smaller retardation value with shorter measuring wavelengths. The characteristics and applications of WR…
The solubility of manganese in YFe 1− y Mn y O 3 reaches y = 0.4. Among these compositions, YFe 0.6 Mn 0.4 O 3 has the highest conductivity with ς= 2.16 Ω −1 ·cm −1 (1000°C, air), which is >1 order of magnitude higher than that of yttrium ferrite, YFeO 3 (ς= 0.10 Ω −1 ·cm −1 , 1000°C, air). In the range 0.2 ≤ y ≤ 0…
Organic photovoltaic cells, similar to Grätzel type, have been widely investigated in recent years. In the case of Grätzel-type cells, TiO2 colloids are usually spin-coated onto an electrode and then sintered. Later, such electrodes are immersed in dye solution to sensitize the TiO2 layer for fabrication of photovolta…
Abstract Regioregular head–to-tail π-conjugated polypyridines have been prepared for the first time by organometallic polycondensation using Ni(II) complexes as the catalyst. The proportion of the HT-content in poly(6-hexylpyridine-2,5-diyl) was higher than 95%.
The orientation density function of spunbounded nonwoven fabric is defined and theoretically derived in this paper. The density function is allowed to vary according to such variables as the feeding velocity of filaments, the moving velocity of the conveyor belt, and the oscillating velocity of the aspirator, all of w…
Fiber irregularities are inherent to textile fibers, particularly natural fibers. This series of papers examines the impact of fiber irregularity on the mechanical behavior of textile fibers. Part I examines the effect of fiber dimensional irregularities on the tensile behavior of linear elastic fibers using the finit…
PET foams of variable densities (1 g/cc to 0.2 g/cc), based on virgin and recycled material were produced by extrusion with physical or chemical blowing agents and evaluated as low density core in sandwich panels having M/F impregnated paper or flame retardant mineral reinforced PET as skin faces. Flexural and shear s…
The technique based on the time-of-flight (TOF) concept was proposed for determination of ion mobility in epoxy resins under isothermal curing conditions. This study extends our earlier investigations on this subject. Ionic conductivity dc measurements also were carried out in order to gain better understanding of the…