Materials Literature
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We present a second gradient elastoplastic model for strain-softening materials based entirely on a finite element displacement formulation. The stress increment is related to both the strain increment and its Laplacian. The displacement field is the only field needed to be discretized using a C1 continuity element. T…
A scanning Kelvin probe technique is used to study the influence of chromate on the kinetics and mechanism of corrosion-driven delamination processes affecting polyvinyl butyral (PVB) coatings adherent to the intact zinc surface of hot dip galvanized steel. Placing aqueous sodium chloride electrolyte onto a penetrativ…
Solid polymerization of 2,5,8-tricarbodiimide-tris-s-triazine potassium salt (potassium melonate) and 2,5,8-trichloro-tris-s-triazine (cyameluryl trichloride) gave a symmetric triangular form of a prototype carbon nitride which is deammonation-polycondensed with fifteen 2,5,8-triamino-tris-s-triazine molecules.
Polycarbonate-based polyurethanes with varying hard segment contents were synthesized. The physical and chemical structures were characterized by using gel permeation chromatography, differential scanning calorimetry, water uptake testing, Fourier transform infrared, and attenuated total reflectance--Fourier transform…
In vitro degradation and erosion of novel, degradable segmented polyurethanes containing a phenylalanine diester chain extender were investigated by exposing the polymers to buffer. chymotrypsin, and trypsin solutions for up to 28 days. Polyurethane degradation and erosion were monitored by gravimetry, scanning electr…
Calcined pure silica MCM-48 is modified by silylating its mesopores with trimethylsilyl chloride; such pore modification along with polymerization and carbonization of divinylbenzene as a carbon precursor is found to be a very efficient way of fabricating highly ordered carbon molecular sieves with three-dimensionally…
Based on our previous Monte Carlo simulation model of electron interactions with solids, including cascade secondary electron production, in which an optical dielectric function was used to describe electron energy loss and the associated secondary electron excitation, we have systematically investigated secondary ele…
The electrical conductivity of sintered samples of ( CeO 2 ) 1 − x ( SmO 1.5 ) x ( 0.10 ⩽ x ⩽ 0.40 ) in air was investigated systematically as a function of temperature between 240 and 1000°C by using two-probe ac impedance technique. The relative contribution of the grain interior (lattice) and grain boundaries to th…
A novel chemical exfoliation of perovskite-like KCa2Nb3O10 utilising an amino acid intermediate is described. At first, amino acid intercalated layered perovskite is prepared by ion-exchange reaction between the interlayer protons in HCa2Nb3O10 and cationic aminoundecanoic acid (H3N+(CH2)10COOH; AUA) under an acidic a…
Delafossite-type CuAlO2 has been found to be promising for thermoelectric conversion.
We report the effects of Cs deposition on the field-emission (FE) properties of single-walled carbon-nanotube bundles. We observe that Cs deposition decreases the turn-on field for FE by a factor of 2.1–2.8 and increases the FE current by six orders of magnitude. After Cs deposition, the FE current versus voltage (I–V…
The Mechanism of Porous Sm0.5Sr0.5CoO3 Cathodes Used in Solid Oxide Fuel Cells , Koyama, Michihisa, Wen, Ching-ju, Masuyama, Takuya, Otomo, Junichiro, Fukunaga, Hiroshi, Yamada, Koichi, Eguchi, Koichi, Takahashi, Hiroshi
Titanium oxo clusters or nanosized Ti–O particles with hydrophobic or hydrophilic character can be obtained by varying the sol–gel synthesis conditions. These species are potentially interesting nano-building blocks (NBB) in the design of textured materials. The reactivity of well-defined hydrophobic NBB towards diffe…
Melamine-based quasi carbon nitride with an orthorhombic layer structure and a molecular weight of more than m/z 5000 was prepared with a system of melamine–Lewis acid at 600–700 °C in an autoclave avoiding catalytic carbonation action by ferrous substances.
A new structural type of sandwich polyoxometalate has been synthesized and characterized. The X-ray structure of this diiron complex, [FeIII2(NaOH2)2(P2W15O56)2], reveals that the junction between the central unit (Fe2Na2) and the trivacant POM units is rotated 60° from that observed in all other known sandwich POMs o…
The present paper deals with the analysis of experimental data from conductivity relaxation experiments. It is shown that evaluation of the chemical diffusion and surface transfer coefficients for oxygen by use of this technique is possible only if accurate data for the conductivity transient can be measured at short…
The complex [Fe(L1H)2][BF4]2 exhibits an abrupt thermal spin-crossover which may be mediated by an order–disorder transition of the BF4− anions.
This title provides the latest information on nuclear physics. Based on a course entitled Applications of Nuclear Physics. Written from an experimental point of view this text is broadly divided into two parts, firstly a general introduction to Nuclear Physics and secondly its applications.* Includes chapters on pract…
Hollow polymer cylinders in a polystyrene glass (see Figure) formed by self organization of hydrogen-bonded supramolecules are reported. Part of the supramolecular template can be conveniently removed after the structure has been formed allowing the tubes to be emptied without need for degradation or similar methods.
In order to establish a method for monitoring contamination in insulators based on leakage current waveforms and their frequency characteristics, the leakage current waveforms and frequency characteristics of an artificially polluted 180 mm diameter cap and pin type insulator were investigated by the wet contaminant a…