Living polymerization and selective end functionalization of iε-caprolactone using zinc alkoxides as initiators
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Materials Literature
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Influence of Fiber and Interfacial Properties on Fracture Behavior of Fiber‐Reinforced Ceramic Composites
The fracture and fracture resistance behaviors of zirconmatrix composites uniaxially reinforced with either uncoated or BN‐coated silicon carbide fibers are studied by performing experiments in three‐point flexure and by analyzing results analytically using a cohesive crack model that incorporates crack bridging and f…
XPS valence band analysis of plasma–treated polymers
Abstract The valence bands (VB) of remote oxygen and remote nitrogen plasma‐treated polyethylene and polypropylene were studied to determine changes in the basic polymer structure. Each of the polymers showed a characteristic valence band profile, which retained much of its original shape after plasma treatment. This…
Structure-property relationships for the thermal phase behavior of discotic liquid crystals: the effect of branching and unsaturation in the side chains of disklike molecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure-property relationships for the thermal phase behavior of discotic liquid crystals: the effect of branching and unsaturation in the side chains of disklike moleculesDavid M. Collard and C. Peter LillyaCite this: J. Am. Chem. Soc. 1991, 113, 23, 8577–8583Publication…
A Phase I Clinical Trial with Gadodiamide Injection, a Nonionic Magnetic Resonance Imaging Enhancement Agent
Twenty adult male volunteers were studied in an unblinded, ascending-dose study to evaluate the safety, tolerance, and pharmacokinetics of intravenously administered nonionic gadodiamide injection. Dosages administered were 0.05, 0.1, 0.2, and 0.3 mmol/kg. Subjects were monitored from 36 hours before, through 72 hours…
Intercalation of poly(ethylene oxide) in vanadium pentoxide (V2O5) xerogel
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntercalation of poly(ethylene oxide) in vanadium pentoxide (V2O5) xerogelY. J. Liu, D. C. DeGroot, J. L. Schindler, C. R. Kannewurf, and M. G. KanatzidisCite this: Chem. Mater. 1991, 3, 6, 992–994Publication Date (Print):November 1, 1991Publication History Published online1…
An ion-implanted diamond metal-insulator-semiconductor field-effect transistor
A p-type conducting layer has been formed in a substrate of semi-insulating natural diamond (type IIa) by boron implantation. Silicon dioxide was deposited over this layer to make an insulated-gate field-effect transistor. Saturation and pinch-off were both observed at room temperature. The transconductance was 3.9 mu…
Anodic Oxidation of Porous Silicon Layers Formed on Lightly p‐Doped Substrates
The electrochemical oxidation of porous silicon layers formed on lightly p‐doped substrates in aqueous electrolytes has been studied in detail. Two different oxidation regimes are observed, depending on the presence of a native oxide on the silicon pore walls. When anodic oxidation is performed on samples previously d…
Lattice distortion of solute atoms in metals studied by x-ray-absorption fine structure
The analysis of the x-ray-absorption fine structure (XAFS) yields information about the local atomic arrangement of the absorbing atom. The technique was used to study systematically the lattice dilatation or compression caused by substitutional impurity atoms in the fcc metals Al, Cu, Ni, Pd, and Ag and the bcc metal…
Kinetic and equilibrium aspects of block copolymer adsorption
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic and equilibrium aspects of block copolymer adsorptionFredrik Tiberg, Martin Malmsten, Per Linse, and Bjoern LindmanCite this: Langmuir 1991, 7, 11, 2723–2730Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 Nov…
A novel carbon material derived from pyridine–borane
Communication: BC 4 N, a new carbon material containing boron and nitrogen is formed in high yield by the thermal decomposition of pyridine–borane at 1050°C in argon. X‐ray powder diffraction shows hk0 and 00l reflections indicating a turbostratic structure. X‐ray photoelectron spectroscopy and analytical investigatio…
Direct Pyrolysis of Raw Rice Husks for Maximization of Silicon Carbide Whisker Formation
A new alternate route for the production of SiC from rice husks has been described. The proposed single‐stage process has the advantage of reduced time of production and a much higher yield of SiC whiskers than the conventional two‐stage process. Direct pyrolysis of raw rice husks was carried out in a graphite furnace…
Characterization of polymer surface sites with contact angles of test solutions. 1. Phenol and iodine adsorption from methylene iodide onto PMMA films
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of polymer surface sites with contact angles of test solutions. 1. Phenol and iodine adsorption from methylene iodide onto PMMA filmsFrederick M. Fowkes, Mary B. Kaczinski, and David W. DwightCite this: Langmuir 1991, 7, 11, 2464–2470Publication Date (Print)…
Cubic nonlinear optics of polymer thin films. Effects of structure and dispersion on the nonlinear optical properties of aromatic Schiff base polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCubic nonlinear optics of polymer thin films. Effects of structure and dispersion on the nonlinear optical properties of aromatic Schiff base polymersSamson A. Jenekhe, Chen Jen Yang, Herman Vanherzeele, and Jeffrey S. MethCite this: Chem. Mater. 1991, 3, 6, 985–987Publicati…
Compositional variations in mafic phyllosilicates from regional low‐grade metabasites and application of the chlorite geothermometer
Abstract Mafic phyllosilicates in metabasites affected by low‐grade regional metamorphism from Wales and eastern North Greenland show variations in their structure and chemistry. These variations are related to four mineral zones in these metabasites, which are recognized on the presence/absence of various key calc‐si…
A stress-dependent magnetic Preisach hysteresis model
The authors present a generalization of the classical Preisach model which handles coupled magnetic and mechanical hysteresis. Magnetostrictive materials are known to have hysteresis with respect to both magnetic field H and mechanical stress lambda . To test the validity of the model, experiments where the two compon…
Performance Study of Zn / ZnCl2, NH 4Cl / Polyaniline / Carbon Battery
A secondary battery of the type , carbon is described. The polymer was electrodeposited on porous carbon rods, in the form of consistent, rather thick, highly porous, and low‐resistance layers. The battery was assembled in a configuration similar to that of the classical R‐6 dry cell. The performance of the battery ha…
Structural study of polyaniline films in reprotonation/deprotonation cycles
Journal of Physical Chemistry
Unconventional morphologies of symmetric, diblock copolymers due to film thickness constraints
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnconventional morphologies of symmetric, diblock copolymers due to film thickness constraintsT. P. Russell, A. Menelle, S. H. Anastasiadis, S. K. Satija, and C. F. MajkrzakCite this: Macromolecules 1991, 24, 23, 6263–6269Publication Date (Print):November 1, 1991Publication…
A differential equation approach to minor loops in the Jiles-Atherton hysteresis model
The reason for the failure of the differential equations to yield physical minor loops involved in the magnetization in ferromagnetic materials is explained. A modified solution for minor loops is presented which retains the features of D.C. Jiles and D.L. Atherton's (1983) original motor loops, but only requires know…