Materials Literature
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AEROSPACE applications demand the ultimate performance out of every material used and at this year's Paris Show, Du Pont highlighted the significance of new developments in high‐grade low and elevated temperature composites and their potential for the future. Latest among the advances introduced were thermoplastic eng…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTailored magnetic properties in trinuclear copper(II) complexes: synthesis, structure, and magnetic properties of complexes derived from [1,3-propanediylbis(oxamato)]cuprate(II) ([Cu(pba)]2-)Ramon Costa, Auxiliadora Garcia, Joan Ribas, Talal Mallah, Yves Journaux, Jorunn Sle…
Stress corrosion cracking (SCC) of rapidly solidified magnesium-aluminum alloys in aqueous solutions of potassium chromate and sodium chloride was investigated using electrochemical techniques, constant displacement rate tests, and optical and electron microscopy. Microcrystalline alloys containing 1 and 9 wt% aluminu…
The T4 lysozyme mutant Ser 117-->Phe was isolated fortuitously and found to be more thermostable than wild-type by 1.1-1.4 kcal/mol. In the wild-type structure, the side chain of Ser 117 is in a sterically restricted region near the protein surface and forms a short hydrogen bond with Asn 132. The crystal structure of…
The crystal structure of three calcic C2/m amphiboles with different Cl contents have been refined to R indices of ∼2% using MoKα X-radiation. The monovalent anion site is split into two distinct sites, O3 and O3', that are separated by ∼0.5A along [100] and are occupied by (OH,F) and Cl, respectively. The variation i…
Abstract X-ray diffraction, FTIR, and chemical analyses were performed on clay fractions (1–2 µ m, <0.1 µ m), separated by means of size fractionations and high-gradient magnetic separation techniques, from a Cryorthod developed in a chlorite-mica schist saprolite. Weathering of large phyllosilicates pre-existing i…
Microorganisms, including bacteria, fungi, protozoa, and microalgae, are composed predominantly of water which prohibits direct observation in a traditional scanning electron microscope (SEM). Preparation for SEM requires that microorganisms be fixed, frozen or dehydrated, and coated with a conductive film before obse…
Wool and poly ( ethylene terephthalate) fabrics and film were treated with low-tem perature plasmas of helium/argon or acetone/argon under atmospheric pressure for 10 to 180 seconds. Although argon itself cannot independently generate a plasma under atmospheric pressure by applying high frequency voltage, it is easily…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of crystallinity on the dielectric relaxation behavior of poly(ether ether ketone)Douglass S. Kalika and Rajendra K. KrishnaswamyCite this: Macromolecules 1993, 26, 16, 4252–4261Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrototypal 1,2,3,5-dithia- and -diselenadiazolyl [HCN2E2].bul. (E = sulfur, selenium): molecular and electronic structures of the radicals and their dimers, by theory and experimentA. W. Cordes, C. D. Bryan, W. M. Davis, R. H. de Laat, S. H. Glarum, J. D. Goddard, R. C. Hadd…
Generation of typical paramagnetic centers by \ensuremath{\gamma} irradiation was studied for various kinds of synthetic silica glasses. Growth behavior of E' centers and nonbridging oxygen hole centers (NBOHC's) with \ensuremath{\gamma}-ray dose depends on contained preexisting point defects. By irradiation at room t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR studies of 1:1 complexes of rhodium(II) and cobalt(II) porphyrins with .sigma. donor and .pi. acceptor ligands: origins of rhodium(II) metalloradical reactivityBradford B. Wayland, Alan E. Sherry, and Andrew G. BunnCite this: J. Am. Chem. Soc. 1993, 115, 17, 7675–7684Pub…
There are perennial problems in the investigation of laterite. (i) The development of an acceptable terminology to describe the forms and processes associated with laterite genesis. Some workers consider that the use of the term laterite should be discontinued, because of its genetic connotations and the uncritical ap…
The wear characteristics of an yttria‐stabilized zirconia (Y‐TZP) are represented by a set of three‐dimensional wear maps under dry and lubricated conditions. Water, paraffin oil, and a formulated oil were used as lubricants. Different wear regions were identified as function of load, speed, and lubricants environment…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface effects on the optical properties of cadmium selenide quantum dotsS. A. Majetich and A. C. CarterCite this: J. Phys. Chem. 1993, 97, 34, 8727–8731Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993https…
A primary bacterial film on a metal surface immersed in natural waters can create electrochemical conditions at the base of the film that are radically different from those in the bulk water. The concentrations of dissolved oxygen and other chemical species; as well as pH at the metal surface are usually affected. The…
The electrical and optical properties of tin oxide (SnO2) thin films heavily doped with antimony (Sb) have been investigated. The films were prepared by spray pyrolysis at a temperature of 500°C. An undoped SnO2 film is transparent and its resistivity is 4 × 10−3 Ω cm. With increase in antimony content the resistivity…
Geometric restraints resulting from differences in the electronic structure of the oxygen atoms involved in the -OH...O= hydrogen bonds are analyzed in terms of their consistency with the symmetry requirements in ferroelectric crystals. The interdependence between these restraints and the symmetry combines the effect…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterogeneous catalytic hydrogenation of polystyrene: thermodynamics of poly(vinylcyclohexane)-containing diblock copolymersMark D. Gehlsen and Frank S. BatesCite this: Macromolecules 1993, 26, 16, 4122–4127Publication Date (Print):August 1, 1993Publication History Published…
Abstract The effect of aging by immersion in water at 60°C on polyester and vinylester resins, unreinforced and reinforced with glass fibers, was investigated. Changes in weight, glass transition temperature, secondary relaxations, and storage modulus, as well as loss modulus were measured, and the environmental effec…