Materials Literature
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A study was undertaken to determine the influence of steam-pressure-refining levels on red maple (Acer rubrum L.) wood chips fabricated into medium density fiberboard (MDF) test boards using four urea-formaldehyde resin levels. Red maple chips were fiberized using a pressurized, double-disk refiner operating at six re…
Magnesium alloys have high strength/weight ratios, but poor corrosion resistance affects the viability of increased magnesium usage in aerospace and other applications. This review approaches the problem of magnesium corrosion from the standpoint of corrosion science by discussing the thermodynamics, kinetics, and mic…
A model describing the electronic structure of transition metal atoms in Hume-Rothery alloys and quasi-crystals is constructed by adding to the classical Anderson Hamiltonian a potential V B ( K ) that describes the diffraction of conduction electrons by Bragg planes near the Fermi surface. Strong deviation from the v…
Hornification is the loss of swelling of the fibre wall resulting from a drying-and-rewetting cycle: it is associated with a stiffening of the fibres which reduces their ability to form inter-fibre bonds. In this paper,factors affecting the extent of hornification are examined using the solute exclusion technique to m…
Tetrathiafulvalene behaves as a catalyst in mediating reaction cycles which feature electron transfer reactions, radical cyclisations and nucleophilic displacements.
We report the first observation of cholesteric blue phases in chiral anisotropic polymer networks. In two-component mixtures of a chiral and a non-chiral diacrylate, we observed typical textures of BPI, BPII and BPIII phases. By photopolymerization of these materials at constant temperature we obtained blue phase netw…
High energy resolution spectra of high purity Cu foil that was scraped in situ are presented. The experimental width (16%–84% measurement) of the Fermi level of nickel obtained under identical experimental conditions was 0.32 ± 0.02 eV. The binding energy scale calibration is based on the position of the Au 4f7/2 line…
Crevice corrosion is a form of localised attack that most often occurs in narrow fissures where oxygen access is poor and a stagnant electrolyte solution is present. It can result in the destruction of the integrity of metal–metal and metal–non-metal junctions such as may exist at bolted and locktight joints, flanges,…
X-ray photoelectron spectroscopy was used to characterize modified surfaces of a biomedically important polymer, poly(ethylene terephthalate). Several modification schemes were investigated and direct silanization with 3-aminopropyltriethoxysilane was found to be the optimum procedure, resulting in an aminated surface…
Tin and various tin compounds have wide utility in coatings, electronics, and catalysts, as well as having numerous biological applications. Distinguishing between different tin compounds on surfaces is an important aspect of research in many of these disciplines. In this work, x-ray photoelectron spectroscopy has bee…
Degummed silk was dissolved in a mixture of CaCl2 and ethanol at low temperature. The concentration and pH of the centrifuged, filtered, and dialyzed silk solution were adjusted, and then it was kept in an air-conditioned room for gelation. The mechanism of the gelation and the gel structure were studied. It was found…
The effective spin Hamiltonian that describes the magnetic properties of La${}_{2}$CuO${}_{4}$ is derived from the nearest-neighbor superexchange interactions. It is shown that the spin system of the CuO${}_{2}$ plane of the compound is frustrated; the principal axes of the symmetric parts of the one-bond anisotropy t…
SiC photodiodes were fabricated using 6 H single-crystal wafers. These devices have excellent UV responsivity characteristics and very low dark current even at elevated temperatures. The reproducibility is excellent and the characteristics agree with theoretical calculations for different device designs. The advantage…
Abstract A nearly stoichiometric SrCoO 3 phase had been prepared up to now only using high oxygen pressure. A new method for preparing fully stoichiometric SrCoO 3 has been proposed using electrochemical oxidation. Brownmillerite‐type SrCoO 2.50 is oxidized into a completely stoichiometric perovskite at a potential of…
Ferroelectric oxide ceramics are used in a very broad range of functional ceramics and form the materials base for the majority of electronic applications. These electronic applications account for more than 60% of the total high technology ceramics market worldwide (High Technology Ceramic News, 1990). It is the purp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubpicosecond 1MLCT .fwdarw. 5T2 intersystem crossing of low-spin polypyridyl ferrous complexesJames K. McCusker, Kevin N. Walda, Robert C. Dunn, John D. Simon, Douglas Magde, and David N. HendricksonCite this: J. Am. Chem. Soc. 1993, 115, 1, 298–307Publication Date (Print):…
The interfacial forces which determine the interaction between a fluid and a solid surface have been investigated under dynamic conditions. The evaporation characteristics of fluid drops placed on solid surfaces have also been investigated. The rate of evaporation of drops of liquids placed on smooth solid surfaces wi…
Tin and various tin compounds have wide utility in coatings, electronics, and catalysts, as well as having numerous biological applications. Distinguishing between different tin compounds on surfaces is an important aspect of research in many of these disciplines. In this work, x-ray photoelectron spectroscopy has bee…
The stability of a hydrogen-bonded complex built through inter-molecular hydrogen bonding between carboxylic acid and pyridine fragments has been examined using infrared spectroscopy. Infrared spectra as a function of temperature have been recorded for the 1:1 complex of 4-hexyloxybenzoic acid and trans-4-propoxy-4′-s…
Data are reported on the perception of fouling in New Zealand based on 200 companies and the application of nearly 2000 heat exchangers. These data are discussed with respect to their occurrence for various heat exchanger applications, industries, and heat exchanger types. The fouling mitigation strategies applied in…