Materials Literature
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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…
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…
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…
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…
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…
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)…
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…
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…
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…
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…
Journal of Physical Chemistry
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…
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…
We describe a new two-dimensional detector for the detection of ions scattered from a solid target, analyzed in energy and scattering angle by a toroidal electrostatic analyzer. The detector resolves the scattering angle with a resolution of 0.4° over a range of 25°, and the ion energy with a resolution of 120 eV over…
The crystal structure of calmodulin (Mr 16,700,148 residues) from Drosophila melanogaster as expressed in a bac$erial system has been determined and refined at 2.2-A resolution.Starting with the structure of mammalian calmodulin, we produced an extensively refitted and refined model with a conventional crystallographi…
We report capacitance and current‐voltage measurements of porous silicon in contact with sputter‐deposited aluminum. Three different substrates: 30–50 Ω‐cm boron‐doped (p − ‐type), 0.01–0.03 Ω‐cm boron‐doped (p + ‐type), and 0.003–0.005 Ω‐cm phosphorus‐doped (n + ‐type) silicon, are used as starting material. Porous s…
Irreversible oxidation of thin polypyrrole layers was studied in carbonate (PC) by the subtractively normalized interfacial Fourier transform infrared spectroscopy method. For comparison, some measurements were performed in acetonitrile instead of PC. In PC, carbon dioxide, a product of anodic oxidation of propylene c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular packing and diffusion in polyisobutyleneRichard H. Boyd and P. V. Krishna PantCite this: Macromolecules 1991, 24, 23, 6325–6331Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://pubs.acs.o…
We investigated the pharmacokinetics of dimeglumine gadopentetate (Gd-DTPA), a contrast agent for magnetic resonance imaging (MRI), in 24 patients with chronic renal failure whose creatinine clearance ranged from 7.2 to 70.0 mL/minute (median 25.4 mL/minute). After single intravenous administration of 0.1 mmol/kg, the…
High shear stress appears to decrease wall thickening in diseased arteries and vascular grafts. To determine if increased shear stress diminishes smooth muscle (SMC) proliferation, we studied the effect of increased blood flow on neointimal thickening in porous polytetrafluoroethylene grafts implanted in baboons. An a…