Materials Literature
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Abstract The existence of a bismuth titanate in the range between Bi 2 Ti 4 O 11 (Bi 2 O 3 · 4 TiO 2 ) and Bi 4 Ti 3 O 12 (2 Bi 2 O 3 3TiO 2 ) has been investigated by X‐ray diffraction of samples prepared by solid state reactions. For reaction temperatures above 1100 °C and a starting composition Bi 2 O 3 · 2 TiO 2 t…
Pd–Fe/SiO2 bimetallic catalysts, prepared by sequential wet impregnation, with a constant 2 wt.% Pd loading and with atomic ratios Fe/Pd = 0.5–2.1, and monometallic samples have been studied by quantitative chemisorption and by FTIR spectroscopy of adsorbed CO and NO. The FTIR results indicate that on the examined bim…
Alkoxy-substituted biphenyls are highly polarized in S1, with the negative charge residing on the ring not possessing the alkoxy group, enabling the photogeneration of spectrophotometrically observable transient biphenyl quinone methides by laser flash photolysis.
Abstract Cross‐linked mixtures of polystyrene and poly(vinyl methyl ether) exhibit a non‐vanishing zero‐angle intensity in small‐angle neutron scattering experiments. A possible explanation is that fluctuations in composition in the mixture may be frozen by the presence of cross‐links. Assuming this, we introduce a sc…
For three-component systems composed of a crystalline polymer (component 3), solvent (component 2) and non-solvent (component 1), polymer-poor liquid—polymer-rich liquid and liquid—polymer crystal phase equilibrium lines are constructed. When the two lines overlap, four regions of different phase separations are disti…
Photochromatic derivatives 1,3,3-trimethylindoline-2-spiro-2′-benzopyran, were synthesized using ultrasound as energy source (55 watt), reaction times are between 10 to 20 min, obtaining higher or slightly lower yield than the conventional reported methods.
A quick embedding method using UV polymerization of methacrylate plastic has been devised for embedding fibers encased in a polyvinyl chloride tube. The resulting embedments are suitable for light microscopy and image analysis.
Nucleation, stability and change of hexagonal CaAl2Si2O8 crystals in the solution of anorthite70forsterite10silica20 wt% were investigated by high temperature in-situ observations, ex-situ runs in a furnace, and examinations of the quenched products.Hexagonal CaAl2Si2O8 was observed to crystallize dominantly in the su…
The mixed-valence copper salt of DMe-DCNQI (1, where DMe-DCNQI = 2,5-dimethyl-N,N′-dicyano-p-benzoquinone diimine) is a molecular conductor whose electrical and magnetic properties are quite sensitive to pressure. We have performed selective deuteriation of the molecule 1. By control of the position and number of deut…
The reaction rates of different sized of commercial cokes with CO2 and air were measured using a combined thermogravimetric and differential thermal analysis technique. The temperature range for air oxidation was varied from 873 to 1073 K, and for the reactions with CO2 it varied from 1173 to 1573 K. The oxidation rat…
The structural evolution of non-acidic chemical-vapour deposition (CVD)-based Pt/KL catalyst has been investigated by in-situ extended X-ray absorption fine structure (EXAFS) spectroscopy. After in-situ reduction (H2, 400 °C), EXAFS results suggested the presence of small metal particles which may be localized inside…
SummaryThe electrodeposition of a metallic coating on to high strength steel introduces the possibility that the steel will fail by hydrogen embrittlement. This paper describes a fundamental study of the hydrogen uptake resulting from electroplating with zinc-nickel alloys in a mildly acidic sulphate bath. Hydrogen pe…
The effect of the vesicle size on in vivo release of daunorubicin, an anthracycline anticancer drug, from liposomes into the circulation was studied in rats. The liposomes were prepared from hydrogenated egg phosphatidylcholine (HEPC) or egg phosphatidylcholine (EPC), cholesterol and dicetylphosphate at a molar ratio…
This paper presents the interim results of tests conducted on 15 kV crosslinked polyethylene (XLPE) and ethylene propylene (EP) insulated cables aged under identical conditions for 36 months at 30/spl deg/C (/spl plusmn/5/spl deg/C) with and without applied voltage transients. Aging voltages were from 1 to 2.5 times r…
The method of time-averaging crystallographic refinement is assessed using a small molecule, alpha-cyclodextrin, as a test system. A total of 16 refinements are performed on simulated data. Three resolution ranges of the data are used, the memory relaxation time of the averaging is varied, and several overall temperat…
Spiro[2H-1-benzopyran-2,2′-[2,3]-dihydroindole]s (abbreviated as spiropyrans) containing long ω-pyridinoalkyl chains have been intercalated into clay interlayers and studied to observe the photochromic characteristics of the resulting molecular assemblies. 1′-Octadecyl-3′,3′-dimethyl-6-nitro-8-pyridinomethyl (SP1801+)…
The crystal structure of the title compound, 1, reveals the presence of two distinct types of tungsten atom in which the four bearing peroxo groups have distorted pentagonal-bipyramidal geometries and the remaining two are octahedral; 1 is an effective catalyst for monoalkene epoxidation, and the oxidation of primary…
In the past photon diffraction has been carried out mainly using the characteristic radiation from x-ray tubes in the energy range from about 820keV. Comparison of these experiments with neutron diffraction results is difficult since in this energy range the photoelectric absorption is the predominant process. The pho…
The effect on corrosion resistance and impact toughness of intermetallic phases, formed in the temperature range of 675--1,000 C (1,247-1,832 F), was studied for 22%Cr 9%Ni 3%Mo 0.15%N-type duplex stainless weld metals. R-phase precipitated rapidly below 800 C (1472 F). [sigma]-phase successively replaced R-phase at 8…
High-speed melt spinning of sheath-core type bicomponent fibers was performed and the change of fiber structure with increasing take-up velocity was investigated. Four kinds of polymers, poly (ethylene terephthalate) (PET), polypropylene (PP), high-density polyethylene (PE) and polystyrene (PS), were selected and thre…