Materials Literature
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A combination of techniques has been used to compare the compositional and microstructural characteristics of two commercially hot‐pressed aluminas. Second‐phase material containing Ni was observed in one material, mainly as small intergranular particles. Thermal treatment in air caused Ni to concentrate at the surfac…
Specimens of Zr have been electron-irradiated at temperatures of ∼715 K using a 1 MeV electron microscope. The damage structure has been analysed at room temperature, and the results show that interstitial and vacancy loops with b = ⅓〈1120〉 nucleate and grow. In addition, vacancy loops with b = ½[0001] and interstitia…
Abstract This study was conducted to further characterize aluminum (Al)‐organic matter complexes and their role in soil acidity. The objective was to determine the extractability of Al from organic matter and to relate it to titratable acidity. Two samples of muck were treated with Al 3+ in such a way as to achieve a…
A sensitive gravimetric method is described which is capable of measuring the rate and total amount of uptake of liquid in the direction perpendicular to the plane of a fabric under known negative pressure gradients. This version of the so-called demand wettability experiment is especially useful when spontaneous tran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilithiation of aromatic ethersG. P. Crowther, Richard J. Sundberg, and Ashok M. SarpeshkarCite this: J. Org. Chem. 1984, 49, 24, 4657–4663Publication Date (Print):November 1, 1984Publication History Published online1 May 2002Published inissue 1 November 1984https://pubs.acs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColloidal catalyst-coated semiconductors in surfactant vesicles: in situ generation of rhodium-coated cadmium sulfide particles in dihexadecyl phosphate vesicles and their utilization for photosensitized charge separation and hydrogen generationYves M. Tricot and Janos H. Fe…
We examined a rhyolitic volcanic ash bed deposited 20000 years ago in different leaching environments in New Zealand. When winter leaching was greater than 250 mm a year, the ash contained 10 to 15% allophane; as leaching increased from 250 to 600 mm a year, the A1/Si ratio of the allophane increased from 1.2 to 2.0.…
The etch rate of in solutions of high concentration was shown to be independent of the applied potential in a wide potential range negative with respect to the flatband value. Dissolution of the solid led to the formation of . The etch rate, which was not mass‐transport controlled, was first order in molecular concent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio direct calculation of the singlet-triplet splitting in a .mu.-oxalato copper(II) binuclear complexM. F. Charlot, M. Verdaguer, Y. Journaux, P. De Loth, and J. P. DaudeyCite this: Inorg. Chem. 1984, 23, 23, 3802–3808Publication Date (Print):November 1, 1984Publicati…
When plasticized PVC packagings are put into contact with liquids (blood, food), a migration of plasticizer and additives may occur, being responsible for a contamination of the liquid and a decrease in the mechanical properties of polymer. The interest in short tests is especially pointed out. In contrast to classica…
The study of recombination lifetimes and kinetics is an essential part of the analysis of recombination mechanisms in semiconductors. In recent years, time-resolved spectroscopy (TRS) has become the standard method of obtaining such experimental data, using a pulsed excitation source and gated detection. In this paper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties and relaxation mechanisms of binary blends of narrow molecular weight distribution polystyrenesHiroshi Watanabe and Tadao KotakaCite this: Macromolecules 1984, 17, 11, 2316–2325Publication Date (Print):November 1, 1984Publication History Published onl…
Abstract The compatibility of poly(ethylene oxide)‐poly(methyl methacrylate) (PEO‐PMMA) blends were examined covering the complete composition range. Up to 20% of PEO content films were transparent and glass transition temperatures were determined by DSC and by refractive index vs. temperature measurements. Only one T…
SUMMARY Backscattered and secondary electrons are both used in the SEM for imaging purposes. The backscattered signal is the result of high angle elastic scattering events, while the secondary signal is the result of knock‐on inelastic collisions. The characteristic differences between images in the two modes arise fr…
Abstract Copper forms passivating layers in alkaline solutions. Depending on the electrode potential a Cu 2 O or a Cu 2 O/CuO, Cu(OH) 2 layer is present. The structure and composition of the film has been examined by different methods like X‐ray Photoelectron Spectroscopy (XPS), Ion Scattering Spectroscopy (ISS) and i…
This work had three objectives: to improve the reported assignments of the vibrational frequencies in several organoslllcon monomers and oligomers; to assign the vibrational frequencies of polydimethylsiloxane (PDMS); and to relate the vibrational spectra of PDMS to its other physical properties, especially at sub-amb…
Based on the two-band imperfect-nesting model within the mean-field approximation, the incommensurate spin-density wave (ISDW) is investigated theoretically. Taking into account infinite numbers of higher harmonics, we obtain an exact solution under the assumptions that the electron dispersion relation is linearized n…
The microstructure of thin films applied by conventional physical vapor deposition for use as optical coatings is columnar for most of the materials commonly used. This has been established for about a decade through numerous experimental observations employing microfractographical replication for use with high resolu…
The organic matrix of calcium carbonate structures can be involved in the formation of the biomineral by regulating various stages of crystal growth. The preponderance of evidence suggests that matrix can act as an initiator of crystal growth at the mineralizing front. The mechanism for this initiation is not known. H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels of the cytochromes b. 5. EPR studies of low-spin iron(III) tetraphenylporphyrinsF. Ann Walker, David Reis, and Virginia L. BalkeCite this: J. Am. Chem. Soc. 1984, 106, 23, 6888–6898Publication Date (Print):November 1, 1984Publication History Published online1 May 2002…