Materials Literature
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Abstract CsOH is investigated, as an alternative to the traditionally used KOH, for the preparation of glycerine initiated polyols. CsOH allows polyether–polyols with higher molecular weights and lower unsaturation contents, ie of better quality, to be obtained. CsOH also increases the reaction rate and permits reduct…
The chemical stability of an amorphous silicon carbonitride ceramic, having the composition 0.57SiC·0.43Si 3 N 4 ·0.49C is studied as a function of nitrogen overpressure at 1873 K. The ceramic suffers a weight loss at p N2 < 3.5 bar (1 bar = 100 kPa), does not show a weight change from 3.5 to 11 bar, and gains weig…
Abstract The service reliability of stainless steels and alloys is predominantly determined by the chemical stability of an ultrathin passive film on their surfaces. The thickness, composition and structure of such an ultrathin oxide film are all influenced by the alloy composition and the nature of the environments t…
The materials used for the pressure-retaining parts of reactor coolant system components in light water reactor nuclear power plants have to meet special requirements in terms of their mechanical properties, workability and in-service performance. Corrosion issues play an important role in connection with plant operat…
Abstract A series a coil coating primers, based on high‐molecular‐weight epoxy resins and a urea formaldehyde crosslinking agent, have been investigated by angle‐resolved XPS (ARXPS) analysis. The addition of a low amount of flow agent additive (<0.2 wt.%) in the formulations induced significant changes in the surf…
The [Cu(cyclam)] 2+ (copper-1,4,8,11-tetraazacyclotetradecane)−saponite complex has been obtained by an ion exchange reaction, and a thin film for the [Cu(cyclam)] 2+ −saponite complex has been prepared by spin-coating onto glass slides. The orientation and the structural change of the guest complex ion in the interla…
Photoinduced electronic energy transfer (EET) and electron transfer (PET) have been investigated in a multichromophoric system 2, that comprises zinc porphyrin (ZnP), dimethoxynaphthalene, and [60]fullerene (C 60 ) chromophores separated by norbornylogous bridge sections of six and five bond lengths, respectively. In…
[formula: see text] [1.1](3,3')-Azobenzenophane, in which two azobenzenes are cyclically connected by -CH2- chains at the meta positions, has been synthesized. The crystal structures of all isomers have been revealed. This is the first report on the crystal structure of the cis isomer of macrocyclic azobenzenes. The t…
The adoption of a field-theoretical approach to problems arising in the framework of electrical insulation is discussed with reference to six main topics, which have been addressed over the last 30 years. These include uniform field electrodes, Green's differential equation, electrode surface roughness, induced charge…
Cyclic deformation has been performed at ambient temperature on ultrafine-grained copper processed by equal channel angular pressing. Observations by electron channelling contrast in a scanning electron microscope revealed that pronounced recrystallization occurred and several distinct dislocation configurations such…
Redox disproportionation of benzyl alcohol to benzaldehyde and toluene catalysed by the Pd561phen60(OAc)180 (phen=1,10-phenanthroline) giant cluster 1 under anaerobic conditions was found, whereas in an O2 atmosphere cluster 1 catalyses the oxidation of benzyl alcohol to benzaldehyde and inhibits further oxidation of…
In the present study, we proposed a simple method to locate defect sites in individual SWNTs with an AFM technique by using a thermal oxidation strategy. After thermal oxidation of well-dispersed SWNTs on a silicon surface in air at 500 °C, almost all of the original SWNTs were fractured into short fragments. The rang…
In this work, primary, secondary and tertiary bis(amide) derivatives of DTPA have been synthesized and the residence time of the water molecule coordinated to their gadolinium complexes has been measured by variable temperature 17O NMR spectroscopy. The influence of substituent characteristics (molecular mass, hydroph…
The thermal behavior of 4 coal samples was investigated using simultaneous thermogravimetry (TG/DTG) and differential thermal analysis (DTA) methods. Upon heating the coals in an inert atmosphere up to 800 ° C, 31.44-43.82% weight loss occurs. The 2 temperature regions of increased chemical reactivity are evident in t…
A methodology to develop subcircuit models of magnetic cores with hysteresis using analog behavioral modeling (ABM) in PSpice is presented. A subcircuit equivalent to the Jiles-Atherton model is developed to model the static ferromagnetic hysteresis. The Hammerstein configuration, which includes a nonlinear static blo…
The crystal structures of three tourmaline crystals: (Na 0.49 K 0.01 Ca 0.48 ) (Mg 1.35 Fe 2+ 0.94 Fe 3+ 0.49 Ti 0.20 ) (Al 4.58 Fe 3+ 0.62 Mg 0.80 ) (Si 5.99 Al 0.01 ) O 18 (BO 3 ) 3.03 (OH) 3.18 F 0.18 O 0.64 , a = 16.017(2), c = 7.256(2) Å, V = 1612.2(4) Å 3 , R3m, Z = 3; (Na 0.64 K 0.01 Ca 0.03 ) (Mn 0.18 Fe 2+ 1.…
Surface-enhanced infrared absorption (SEIRA) has been observed by transmission spectroscopy on a vapor-deposited platinum substrate. Monolayers of p-nitrothiophenol ( p-NTP) adsorbed on thin island films of platinum were used to probe the enhancement and distortion of the absorption bands of p-NTP. The greatest enhanc…
The scattering of waves by multilayered periodic structures is formulated in three-dimensional space by using Fourier expansions for both the basic lattice and its associated reciprocal lattice. The fields in each layer are then expressed in terms of characteristic modes, and the complete solution is found rigorously…
In this paper, the results of tests on a 275 and a 400 kV capacitor voltage transformer are presented. The objective has been to determine the transfer function of the CVTs in the Scottish Power extra-high-voltage (EHV) system, which in turn can be used to compensate for the errors at harmonic frequencies. As a primar…
Single-walled carbon nanotubes (SWNTs), upon exposure to the flash from a regular 35 mm camera, were found to ignite and produce small amounts of a bright orange solid. X-ray powder diffraction analysis revealed this solid to be composed mostly of Fe 2 O 3, along with trace amounts of Fe 3 O 4, originating from the Fe…