Materials Literature
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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…
Misfits between lattice points of intersecting crystals and between corresponding lattice planes are analysed using O-lattice constructions referred to both direct and reciprocal spaces. O-lattice planes are described by the same expression as the ‘Moiré planes’ formed by the mismatch of correlated planes, which facil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular kinetic isotope effects in alkane hydroxylations catalyzed by manganese and iron porphyrin complexesAlexander Sorokin, Anne Robert, and Bernard MeunierCite this: J. Am. Chem. Soc. 1993, 115, 16, 7293–7299Publication Date (Print):August 1, 1993Publication Histo…
The fourfold dissociation of superdislocations in Ni3Al has been recorded on images that were formed using second-order reflections, and the dissociation distances of the Shockley partial dislocations that bound a complex stacking fault (d CSF) have been measured. Comparisons with computer simulated (2g · 5g) images h…
We present a new approach to magnetostriction that is formulated to describe materials with large magnetostriction. The main idea of the theory is to derive precisely from lattice considerations the potential wells of the anisotropy energy. The theory exhibits frustration in the sense explored by the authors in the ri…
Oil sorption capacities of various natural and man-made fibrous sorbents were compared in a simulated seawater bath containing oil. Natural sorbents such as milkweed, kapok, cotton, and wool showed higher sorption capacities than man-made sorbents such as polyester, polypropylene, viscose rayon, nylon 6, nylon 66, and…
Abstract Additional well-crystallized kaolin from Washington County, Georgia, has been supplied to the Clay Minerals Society Source Clay Repository to replace the exhausted supply of KGa-1. This kaolin is called KGa-1B and is from a geographic location and stratigraphic position close to where KGa-1 was collected. Sli…
Raman spectra of tetragonal zirconia were studied for the systems ZrO 2 ‐Y 2 O 3 , ZrO 2 ‐CeO 2 , ZrO 2 ‐Y 2 O 3 ‐Nb 2 O 5 , and ZrO 2 ‐Y 2 O 3 ‐Ta 2 O 5 There was no change in the Raman bands for tetragonal ziraconia in the ZrO 2 ‐Y 2 O 3 system as a function of Y 2 O 3 content . On the other hand, in the ternary sys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical characterization of anodic aluminum oxide films containing electrochemically deposited metal particles. 1. Gold in phosphoric acid anodic aluminum oxide filmsCarolyn K. Preston and Martin MoskovitsCite this: J. Phys. Chem. 1993, 97, 32, 8495–8503Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of colloidal silver-platinum alloysKanjiro Torigoe, Yoshifumi Nakajima, and Kunio EsumiCite this: J. Phys. Chem. 1993, 97, 31, 8304–8309Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 A…
Lutetium oxyorthosilicate Lu_2(SiO_4)O has two crystallographically independent lutetium sites. When it is doped with Ce, the dopant Ce is assumed to occupy two different sites, and thus the existence of two activation centers is proposed. UV and gamma-ray excited spectra clearly indicate that two activation centers e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of hyperbranched polyurethanes prepared from blocked isocyanate monomers by step-growth polymerizationRalph Spindler and Jean M. J. FrechetCite this: Macromolecules 1993, 26, 18, 4809–4813Publication Date (Print):August 1, 1993Publication Histo…