Materials Literature
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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…
Crystallization fouling of calcium sulfate was investigated in a plate and frame heat exchanger. The effects of flow velocity, wall temperature, and CaSO4, concentration on the fouling rates have been investigated and the distribution of scale along the heat transfer surface has been observed. The measured fouling cur…
The second-order Raman spectra of diamond and silicon have been calculated using ab initio phonons and phenomenological polarizability coefficients. The sharp peak in the spectrum of diamond near the two-phonon cutoff is explained by a maximum in the vibrational density of states; this maximum originates from the uppe…
Stokesian dynamics is used to simulate the dynamics of a monolayer of a suspension of bimodally distributed spherical particles subjected to simple shearing flow. Hydrodynamic forces only are considered. Many-body far-field effects are calculated using the inverse of the grand mobility matrix. Near-field effects are c…
Abstract N 2 O decomposition and formation during the oxidation of NH 3 and HCN were studied in a quartz flow reactor in the presence of CO, NO and other gases. The emphasis is on the influence of CO and NO. In addition, the homogeneous nitrogen chemistry of fluidized bed combustion and the selective noncatalytic redu…
We studied the sintering process of sol‐gel‐prepared monodisperse submicrometer CeO 2 spheres by examining the microstructural changes of single spherical particles after successive heat treatment in oxygen up to 850°C using transmission electron microscopy. Steps of organic phase removal, CeO 2 crystallization, grain…
The INEL diffractometer, equipped with a CPS120 curved detector and set up in a Debye-Scherrer geometry, is a unique tool for carrying out powder diffraction studies on air-sensitive and/or small-volume samples. Although it has routinely been used in powder diffractometry because of its minute acquisition times, its a…
Antibodies raised against the Alcaligenes eutrophus poly-beta-hydroxybutyrate (PHB) synthase polypeptide were used for immunocytochemical localization of the synthase enzyme in whole cells and purified PHB granules. The data presented demonstrate for the first time that the synthase enzyme is located on the surface of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCononsolvency of poly(N-isopropylacrylamide): a look at spin-labeled polymers in mixtures of water and tetrahydrofuranFrancoise M. Winnik, M. Francesca Ottaviani, Stefan H. Bossmann, Wenseng Pan, Miguel Garcia-Garibay, and Nicholas J. TurroCite this: Macromolecules 1993, 26,…
Abstract The primary objective of this work was to demonstrate the conversion of scrap tires to activated carbon. We have been successful in this endeavor, producing carbons with surface areas greater than 500 m 2 /g and significant micropore volumes. Tire shreddings were pyrolyzed in batch reactors, and the pyrolysis…
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The pitting behavior of sputter‐deposited Al binary alloy thin films was studied. Pitting and repassivation potentials were determined in 0.1 M for samples in freshly deposited and air‐aged states. Aging for several years in laboratory air increased the pitting potential for some of the alloy systems but had no effect…
The likelihood of a first-order liquid-liquid phase change in carbon from a mostly graphitic configuration to one that is more tetrahedral in character is explored. Liquid-phase changes in other materials are noted. Pertinent data on liquid carbon are reviewed and the model is briefly described. The model is consisten…
Compton scattering from bound electrons is studied within external field quantum electrodynamics and the independent-particle approximation (IPA), but without making use of any additional approximations, such as the impulse or incoherent-scattering factor approximations. Our calculations of the doubly differential cro…