Materials Literature
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A two-dimensional dynamics model for the motion of fibers in an accelerating laminar air flow is presented. Nonlinear model equations for each fiber include effects of inertia, air drag, and flexural rigidity. This rigidity, or stiffness, acts in such a way that a curled or hooked fiber resists being straightened. Ran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of Metal-meso-Octaethylporphyrinogen Complexes Leading to Novel Oxidized Forms of Porphyrinogen Other than Porphyrins. 1. The Redox Chemistry of Nickel(II)- and Copper(II)-meso-Octaethylporphyrinogen Complexes Occurring with the Formation and Cleavage of a Cyclopro…
Cluster models of increasing complexity have been used to model magnetic interactions in KNiF3. These clusters contain two or four magnetic centers plus the bridge F− anions and different representations of the remaining of the crystal. The magnetic coupling constant has been obtained by computing ab initio wave funct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonte Carlo Simulation of Polymer Network Formation with Complex Chemical Reaction Mechanism: Kinetic Approach on Curing of Epoxides with AminesKuo-Chung Cheng and Wen-Yen ChiuCite this: Macromolecules 1994, 27, 12, 3406–3414Publication Date (Print):June 1, 1994Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrene Sorption in Organic-Layered Double-Metal HydroxidesPrabir K. Dutta and Daniel S. RobinsCite this: Langmuir 1994, 10, 6, 1851–1856Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10…
The optical absorption coefficient at room temperature has been measured for cerium-doped Y2O3 and Y1.4Gd0.6O3 samples from 1500 to 45000 wave numbers. Diffuse reflectivity has been measured on cerium-doped powders of Y2O3, Lu2O3, Sc2O3, Ba2GdTaO6, and ThO2 over the same range. A number of 4f − 4f and 4f − 5d transiti…
Abstract The rocks of the palygorskite deposit at Bercimuel (Segovia, Spain) have been studied by transmission electron microscopy and microanalysis. These rocks correspond to the zone of convergence of two alluvial fan systems that have filled the small basin of the River Riaza and would originally have been composed…
A method based on use of ion exchange resin capsules was evaluated for simultaneous extraction of plant available nutrients (N, P, K, Ca, Mg, and Na) to determine its utility as a general soil testing procedure for soils of world‐wide origin. Nutrient release kinetics of soils representing many soil orders were measur…
Nonlinear optical polymers contain molecular dipoles with very large hyperpolarizabilities in a glassy polymer matrix. Two typical examples—a guest-host system with dispersed polar dye molecules and a side-chain material with chemically attached molecular dipoles—were investigated by means of poling experiments, diele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemically Polymerized Terthiophene Derivatives Carrying Aromatic SubstituentsCsaba Visy, Jukka Lukkari, and Jouko KankareCite this: Macromolecules 1994, 27, 12, 3322–3329Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inis…
The development of stresses in the scale during the high-temperature oxidation of metals can have important consequences for the long-term protection of components in service, particularly if this leads to scale failure, allowing access of the environment to the metal surface. Such stresses may result from externally…
films have been prepared by radio frequency (RF) magnetron sputtering at various total pressure, RF power, and substrate temperatures. Microstructure and crystallographic orientation were characterized by x‐ray diffraction. Surface morphologies were observed by scanning electron microscope. In addition, cathodolumines…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChirochromism-Photochromism by Epimerization: Search for a Liquid Crystal PhototriggerMingbao Zhang and Gary B. SchusterCite this: J. Am. Chem. Soc. 1994, 116, 11, 4852–4857Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1…
Abstract The mechanism of photoinduced structural transformations in amorphous As 2 S 3 is studied with the differential IR Fourier spectroscopy technique in the 400 to 100 cm −1 region. It is established that the irreversible photostructural effect observed in freshly evaporated thin films is accompanied by switching…
The phase compositions of undoped and europium‐doped zirconia samples, obtained by precipitation and thermal treatment from 350° to 1000°C, have been investigated by powder X‐ray diffractometry, infrared spectroscopy, and cathodoluminescence spectroscopy. The low‐temperature stabilization of tetragonal zirconia is mai…
The alignment of nematic liquid crystals on micro-groove patterns was studied. It has been found that the order of the alignments is determined by the edge shape, spacing, and line pitch of the micro-groove patterns. On coarse patterns, with pitches greater than 2 μm, striped patterns of the liquid crystal alignment w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSol-Gel Derived TiO2 Microemulsion Gels and CoatingsDespina Papoutsi, Panagiotis Lianos, Panagiotis Yianoulis, and Petros KoutsoukosCite this: Langmuir 1994, 10, 6, 1684–1689Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue…
Extended Hückel molecular orbital (EHMO) calculations were performed on some substituted aliphatic amines and some substituted pyridine derivatives that are used as corrosion inhibitors in sour media. Correlations of corrosion rates with the charge on the nitrogen atom (Zn), energy of the highest occupied molecular or…
The deformation behavior of a single polymer chain subjected to an external force was studied by computer simulations. Both random walks and self-avoiding walks were investigated. The simulations were performed in two and three dimensions using the bond fluctuation model. The projection of the end-to-end vector in for…
A detailed investigation of the superplastic deformation of two grades of the Pb-62 Sn eutectic (where the compositions here and subsequently are in weight per cent) was conducted under identical experimental conditions of grain size (about 8 μm), temperature (390–420 K) and stress (0·1–10 MPa). The first grade (grade…