Lamellar diblock copolymer grain boundary morphology. 1. Twist boundary characterization
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On the Pitting Resistance of Sputter‐Deposited Aluminum Alloys
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…
High-pressure liquid-liquid phase change in carbon
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 of photons from bound electrons: Full relativistic independent-particle-approximation calculations
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…
O-lattice analyses of interfacial misfit. I. General considerations
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…
Intramolecular kinetic isotope effects in alkane hydroxylations catalyzed by manganese and iron porphyrin complexes
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…
Measurements of antiphase boundary and complex stacking fault energies in binary and B-doped Ni3Al using TEM
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…
Theory of magnetostriction with applications to TbxDy1-xFe2
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 behavior of various sorbents studied by sorption capacity measurement and environmental scanning electron microscopy
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…
Sampling and Analysis of KGa-1B Well-Crystallized Kaolin Source Clay
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 Spectroscopy of Tetragonal Zirconia Solid Solutions
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…
Optical characterization of anodic aluminum oxide films containing electrochemically deposited metal particles. 1. Gold in phosphoric acid anodic aluminum oxide films
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…
Preparation and characterization of colloidal silver-platinum alloys
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…
Light emission mechanism of Lu/sub 2/(SiO/sub 4/)O:Ce
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…
Synthesis and characterization of hyperbranched polyurethanes prepared from blocked isocyanate monomers by step-growth polymerization
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…
Expression, purification, crystallization, and biochemical characterization of a recombinant protein phosphatase.
A protein phosphatase (PPase) from the bacteriophage lambda was overexpressed in Escherichia coli. The recombinant enzyme was purified to homogeneity yielding approximately 17 mg of enzyme from a single liter of bacterial culture. Biochemical characterization of the enzyme showed that it required Mn2+ or Ni2+ as an ac…
The Dynamics of Nucleation for the Cahn–Hilliard Equation
When a constant metastable solution of the Cahn–Hilliard equation is subjected to a spatially localized large-amplitude perturbation, a transition process may be triggered leading to a globally stable stationary solution. In one space dimension, the existence and instability of a third stationary solution with the sam…
Dynamics of small molecules in dense polymers subject to thermal motion
A new transition-state theory model has been proposed that is based on the concept that the dynamics of small molecules dissolved in dense polymers is coupled to the elastic thermal motion of dense polymers but can be treated separately from their structural relaxation. The model has been used to study the dynamics of…
A molecular-dynamics study of polyethylene crystallization
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA molecular-dynamics study of polyethylene crystallizationT. A. Kavassalis and P. R. SundararajanCite this: Macromolecules 1993, 26, 16, 4144–4150Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993https://pubs.…
Methyltrioxorhenium(VII) as Catalyst for Epoxidations: Structure of the Active Species and Mechanism of Catalysis
Explosive in the solid state, the bis(η2-peroxo) complex 1, which in solution is the active species in the epoxidation of olefins with [CH3ReO3], could be characterized by X-ray crystallography as the diglyme adduct 2. Under catalytic conditions (excess of H2O2), 1 is far more stable than in the free state.