Materials Literature
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The pyrolysis of a low-oxygen SiC fiber, prepared by the electron-irradiation curing method, has been investigated in N2 atmosphere at temperatures from 1673 to 1973K. Then, the pyrolytic behavior in N2 was compared with that in Ar. The fiber absorbed a considerable amount of nitrogen, and consequently, the mass loss…
π-Cation radicals of iron(III) derivatives of some deformed porphyrins have been characterised using UV/VIS, IR and 1H NMR spectroscopy and by magnetic susceptibility measurements. The deformation in these systems has been induced by a covalent attachment of short bridging chains across the porphyrin periphery. Molecu…
Many studies have been made on liquid bridges between particles, but the mechanism of liquid bridge formation and its adhesion force when the bridge is in an equibrium condition with the surrounding humidity has not been theoretically clarified. A study has been made on this subject and a new theory is introduced in t…
Scanning confocal light microscopy offers an alternative three-dimensional imaging technique that can allow a fresh view of surfaces. It can image samples that are wet, coated, or porous and cope with highly irregular surfaces for which the desired depth of field is difficult to study by other methods. Its principal a…
Five crystalline phases have been characterized in the perovskite layer compound (C10H21NH3)2CuCl4, using differential scanning calorimetry, X-ray diffraction and infrared spectroscopy. The ordered phase V contains three types of hydrocarbon chains; two of them have an almost extended configuration with a gauche bond…
Advanced materials are receiving increasing attention for applications requiring high‐leverage materials possessing potentially high pay‐offs. While the low‐rate deformation response of a broad range of advanced materials is receiving intense scientific study, increased utilization of these material classes under dyna…
An irradiation of solid samples with x-rays causes an electron emission from the sample surface, owing to photoabsorption. These electrons can be detected under vacuum conditions and are photo, Auger and secondary electrons. Due to inelastic collisions most of these electrons have lost some of their original kinetic e…
In relation to the investigation of their electrochemical properties we prepared 24 pyridinium derivatives ( I , IV , V , VI , VII ) with alkyl and aryl substituents in positions 1, 2, 4 and 6, and 19 derivatives with two pyridinium nuclei ( II , III , VIII , IX , X ) connected by an aliphatic or an aromatic chain. Al…
In February 1953, forty years ago, the first synthetic diamonds were made in Sweden. This was then the culmination of more than ten years’ work. In 1942, ASEA started with experiments of converting graphite into diamonds under high pressures and high temperatures. The difficulties were bigger than anyone could have im…
Friction and wear tests from room temperature to 1000°C were carried out for two kinds of mullite ceramics, and compared with those of alumina ceramics. Samples prepared from the natural raw materials (M-1) and the sol-gel method (M-2) were used. The former contained considerable amount of impurities and they formed g…
Co K-edge EXAFS data of some (porphinato)cobalt(III) complexes with amine ligands in chloroform solution are reported. Data for the following compounds were collected: chloro(tetraphenylporphinato)cobalt(III)(TPPCoCl) complexed with pyridine (A), isoquinoline (B) and cyclohexylamine (C) and 4-methylpiperidine complexe…
The internal reinforcement of Douglas-fir by glass or basalt fibers impregnated with resorcinol-phenol-formaldehyde or polymeric diphenylmethanediisocyanate bonding resins has been investigated. The objective was to evaluate the improvement in composite properties by the use of silane coupling agents. Fibers were trea…
Vielzeuf and Holloway (1988) experimentally studied the melting of a metapelite under fluidabsent conditions. At 10 kbar, three main stages of melting were distinguished : I) The first melting occurs below 800~ and corresponds to the breakdown of muscovite via reactions such as Ms + Bt + PI + Qtz + V = M + Als;Ms + PI…
The one-electron donor (reducing) sites and their strength distribution on hydrotalcite, MgO and Al2O3 surfaces have been measured with a series of electron acceptor molecules (nitrobenzene, m-dinitrobenzene, sym-trinitrobenzene, 2,4-dinitrotoluene, tetracyanoethene), whose electron affinity (Eea) values are different…
These experimental studies are mainly concerned with the matter ejection from the free surface and the bulk microspalling of the sample near the free surface. We describe an experimental technique using flash X‐ray radiography in order to study the shock‐induced ejection and microspalling. Experiments have been achiev…
Ionomers are predominantly nonpolar polymers that contain a small amount of bonded salt groups. Microphase separation of ion-rich microdomains occurs as a consequence of the thermodynamic incompatibility of the salt groups and the polymer matrix and associative interactions between salt groups. Associations of the sal…
As indicated by thin layer cyclic voltammetry, electrocrystallization of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) at the second oxidation potential affords a charge-transfer salt of 1 : 1 stoichiometry, i.e.(BEDT-TTF)PF6·0.5CH2Cl2, the crystal structure of which is presented.
This paper describes the effect of fibre linear density and the use of carded cotton on the mechanical properties and handle of blended-fibre fabrics produced from open-end-spun and ring-spun yarns. It is found that, whereas fibre linear density has very little effect, the use of carded cotton with polyester fibre enh…
Considerable progress has been made in assigning the UV/VIS/near-IR electronic spectra (5000–50 000 cm–1) of [Ru2Cl9]3– and [Ru2Br9]3–, with the aid of SCF-Xα-SW calculations. A conceptual framework within which band energies and relative intensities can be discussed was constructed by reference to the corresponding […
Solid state reaction diffusion between Ag and Zr in the temperature range from 980 to 1190 K has been studied. Two intermetallic compounds, AgZr and AgZr2, predicted from the Ag–Zr phase diagram have been observed in the diffusion zone. About 95% of the total thickness of the compound layers is occupied by the AgZr ph…