Materials Literature
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A combination of quartz crystal microweighing (QCM) and infrared reflection absorption spectroscopy (IRRAS) was used to investigate the formation of ultrathin polysiloxane films on iron oxide surfaces by the adsorption of alkyltrimethoxysilanes in a humid atmosphere. It was shown that in the absence of a catalyst, onl…
Every coated fabric is unique when it comes to flame retardation because there are so many variables that can affect its use and performance. The proper formula must be worked out for each one. In this paper I have attempted to outline the basic principals of flame retardant technology. Every coated fabric will re qui…
A constitutive equation applicable to HCP metals and certain high strength alloy steels is applied to commercial purity titanium and the alloy Ti-6Al-4V. Deformation twinning and strain aging influence the deformation behavior of titanium, but are less significant in the alloy. Adiabatic heating is significant in the…
The magnetic properties of SmCo/sub 5/, Sm(Co/sub bal/.Fe/sub 0.21/Cu/sub 0.06/Zr/sub 0.03/)/sub 7.6/, Sm(Co/sub bal/Fe/sub 0.25/Cu/sub 0.06/Zr/sub 0.03/)/sub 7.6/, Sm(Co/sub bal/Fe/sub 0.28/Cu/sub 0.06/Zr/sub 0.02/)/sub 7.6/, sintered magnets have been measured up to 350, 400 and 450/spl deg/C. For a fixed temperatur…
Studies on the formation of complexes of europium(III) ions in water with various sensitizers are reported. The sensitizers utilized are derivatives of 1,10-phenanthroline-2,9-dicarboxylic acid and 2,2′:6′,2″-terpyridine-6,6″-dicarboxylic acid. Both 1:1 and 2:1 complexes form, the latter being particularly efficient l…
Perovskite-type Nd 1- x Sr x CoO 3- y catalysts with various Sr mole fraction were prepared and investigated for the effect of Sr substitution on their catalytic activities in the oxidation of carbon monoxide. Utilizing the static and flow methods, kinetic studies have been carried out between 373 and 523 K. The initi…
The microstructure of hydrobiotite, interstratified biotite/vermiculite, was examined to demonstrate an atomic scale investigation of weathering of minerals by high-resolution transmission electron microscopy (HRTEM). Vermiculite basal spacing was collapsed to about 0.95 nm, compared to the unchanged biotite 1.0 nm sp…
A very large radial graded-index (GRIN) polymer was successfully prepared for the first time, to the best of our knowledge, by two methods: the curved mold method and the diffusion copolymerization method. Both methods gave a radial GRIN polymer with a diameter of 70 mm and a ∆n value greater than 0.02. Ray tracing th…
This paper deals with the mathematical modelling of the random scission of branched chains. The objective is to predict the reaction products as well as the molecular weigth distribution for processes such as the chemical modification of polyolefins by free radical mechanism. In comparison with linear chains, where th…
Under shear deformation direct transitions SiI → SiIV → SiIII are observed; orientation relationships (OR) between phases have been determined for these transitions. It is shown, that the complete set of OR between phases SiI and SiIV contains six variants. On the basis of the obtained experimental data, a P-T-[sgrave…
Numerical self-consistent-field theory (Scheutjens−Fleer theory) is used to describe the crossover from “dry” brush behavior, where the matrix from which the polymers adsorb is itself a high-molecular-weight polymer, to “wet” brush behavior, where the matrix is a small-molecule solvent. The free energy, f *, required…
An attempt was made to compare the desorption behavior of the surface oxygen complexes in an inert atmosphere with that in the O 2 -gasification atmosphere. For this purpose, the transient kinetics (TK) with switching 18 O 2 to 16 O 2 was carried out and from this TK experiment the in situ desorption behavior of 18 O…
New metal-free and metal-containing 2,3,7,8,12,13,17,18-octakis[(4-methoxycinnamoyl)oxyalkylthio]tetraazaporphyrins with different polymethylene chain lengths (3,6,8 or 11 methylene groups) were synthesized by esterification of 2,3,7,8,12,13,17,18-octakis(hydroxyalkylthio)tetraazaporphyrins, obtained from 1,2-dicyano-…
Structural, photophysical, and charge transport properties of n -hexyl substituted polysilylenes containing 5, 33 or 67% n -hexylsilyne branching points were investigated. According to WAXD, DSC, and vibrational studies, introduction of branching points partially reduces the high degree of crystallinity of linear poly…
The phase K3[SO4]F was found to be dimorphic, undergoing a reversible tetragonal (β) to cubic (α) phase transition at 585 °C. The room-temperature polymorph, β-K3[SO4]F, is isostructural with Ba3SiO5, as confirmed by Rietveld refinement of X-ray powder diffraction data: a= 7.2961(5), c= 10.854(1)Å, R= 0.0689 and Rwp=…
Three different heteroaromatic charge transfer chromophores, e.g. donor(D)–acceptor(A)-substituted thieno [3,2-b] thiophenes 3 and 4, D-substituted thieno [2,3-c] pyridinium salts 7 and 2-(2′-thienyl)pyridinium salts 10 have been prepared. Alkylchalcogenic ethers were used as D-groups. The molecular first hyperpolariz…
Near-equiatomic NiTi alloys are known to exhibit different transformation sequences associated with different thermomechanical treatment and testing conditions. Although a wide range of experimental data has been accumulated through the past few decades of research, there has been a lack of understanding of the thermo…
TiO2, Mn2O3, Tb4O7, Nb2O5 and WO3 can be doped into yttria-stabilised zirconia (YSZ) and from solid-state solutions. Five basic characteristics are found: (1) The phase of zirconia can be controlled by changing the oxygen vacancy concentration by doping. Dopants with valences lower than four tend to increase the oxyge…
Ordered diblock copolymer blends have recently become the subject of tremendous research interest since they can be used to elucidate the intramicrodomain segregation of blocks differing in length, as well as to identify the molecular and blend parameters yielding phase immiscibility. In this work, we explore the infl…
Crystallization studies on blends of high and low molecular weight poly(ethylene oxide) (PEO) have been carried out to characterize phase behavior and morphology. At low crystallization temperatures, both components cocrystallize into a common crystal lattice. The thickness of the cocrystal is found to vary with the b…