Materials Literature
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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…
The effect of filler concentration on the dielectric properties in the ultralow-frequency region and on the electrical conductivity was studied for ethylene propylene rubber. First, we investigated the relation between the electrical conductivity and filler concentration: as the volume fraction of fillers q/sub a/ inc…
Bicomponent mixtures of 4-cyanobiphenyl-4′-yl 4′-alkylbiphenyl-4-carboxylates (nCBB) and 4-alkoxy-4′-cyanobiphenyls (nOCB) were studied and their phase diagrams obtained by thermomicroscopy. The strong enhancement of a smectic Ad phase in mixtures with the smectic members of the nOCB (n ⩾ 8) series and the induction o…
Aluminum powder entrained by ammonia‐containing nitrogen gas was reacted at various temperatures and time to form aluminum nitride powder. The kinetics of nitride formation were determined by a quantitative X‐ray analysis and compared with those determined by a nitrogen analysis of the product. The conversion to alumi…
Sulfapyridine is used to test the extended Hildebrand approach for predicting solubility in dioxane-water mixtures. The method provided good agreement with the experimental data. A modification of this method, that directly relates the logarithm of the mole fraction solubility with the solubility parameter of the solv…
Stator bars subjected to operating stresses for 7 and 22 year periods were retrieved from a hydrogenerator to undergo short term electrical diagnostic tests in order to determine whether any significant aging of the insulation had taken place. The AC breakdown voltage (U/sub bk/), partial discharge inception voltage (…
Novel chiral twin molecules, (S)-2-methylnonanedioic acid bis[4-(5-octyl-2-pyrimidinyl)phenyl] ester (MNB-8-PYP) and (S)-2-methyldecanedioic acid bis[4-(5-octyl-2-pyrimidinyl)phenyl] ester (MDB-8-PYP), have been prepared and the odd-even effect of the chiral spacer on the helical twisting power investigated. Pitch mea…
Abstract Microporous silica gels can be made by polymerizing partially hydrolyzed tetramethoxysilane sols present in the aqueous phase of bicontinuous microemulsions stabilized with didodecyldimethylammonium bromide. When vacuum‐dried, the gels made in microemulsions have about twice the specific surface area of conve…
Abstract The plastic deformation mechanism operating in polymer glasses is analyzed. The whole process consists of two main stages: nucleation of special shear defects, called PSTs (plastic shear transformations), and their disappearance. The important feature of plastic deformation of glasses is the storage of a larg…