Materials Literature
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The effect of molding temperature and time on the electrical conductivity of Vapor Grown Carbon Fiber (VGCF) filled High Density Polyethylene (HDPE)/Poly(methylmethacrylate) (PMMA) blends has been investigated. The dispersion state of short carbon fibers in polymeric matrix is affected not only by the volume fraction…
An experimental and theoretical study of the degassing behavior of a poly(ethylene) high-density foam, during storage at laboratory conditions, is presented. This foam is an expanded form of a low-density poly(ethylene), which is produced from its melt, using high-pressure nitrogen gas as the blowing agent, and is the…
A general methodology has been established for the synthesis of 40–120 Å Cu nanoclusters within the morphologies of [MTD]400[NORCOOH]50 and [MTD]400[NORCOONa]50 diblock copolymer films. In this technique the films are soaked in aqueous copper(II) acetate solutions prior to reduction of the sequestered Cu2+ ions. A loa…
The classical Blech description of the electromigration—stress interplay in interconnects treats the maximum electromigration compressive stress as a material constant (the yield stress). Systematic drift velocity and hillock topography observations in bare Al, anodized Al, and Cu conductors show this description to b…
The diamine monomer bis(m-aminophenyl) methyl phosphine oxide (DAMPO) was synthesized via nitration and reduction of diphenyl methyl phosphine oxide. Rigorous purification of this monomer enabled its utilization in the synthesis of high molecular weight poly(ether imide)s. Both thermoplastic materials and thermosettin…
Diffusion induced recrystallization (DIR) in the Ni(Cu) system was experimentally studied. The notation Ni(Cu) means that Cu atoms diffuse into a pure Ni or binary Ni–Cu phase. The Cu/Ni/Cu diffusion couples consisting of pure Cu single crystals with the same crystallographic orientation and a pure Ni polycrystalline…
Silver(I) is employed to dope poly(3-alkylthiophenes) (P3ATs) and other conjugated polymers. Solutions containing silver(I) salts and P3ATs, which usually undergo spontaneous reaction, doping, and precipitation, were stabilized using coordinating ligands that modify the reduction potential of the Ag(I) species. Upon r…
Nonstochiometric mixed oxides are often of interest for their novel catalytic or material properties yet are often difficult to synthesize in easily characterizable forms. We report on the use of low-temperature epitaxy of Ca and Mg under oxidizing conditions to yield mixed thin film oxides. Low-energy electron diffra…
The development of high-temperature titanium alloys has been dominated by the requirements of aerospace industries. Initially, improvements in tensile strength and creep properties were the main interest. Gas inlet temperatures in aero-engines have increased continuously and, nowadays certain components in gas turbine…
The TiB2-ZrB2 ceramic system, which has a range of high hardnesses and electrical conductivities, was sintered by the hot-pressing method from mixed powders of TiB2 and ZrB2. The mixed powders calcined at 1450°C for 5.4ks with compositions from 100mol% TiB2 to 100mol% ZrB2 (20mol% step) were preformed at a pressure of…
The adhesion strength of polyamideimide (PAI)/copper joints was investigated as a function of the curing temperature and time. The adhesion strength decreased as the thermal stress increased with the increase of both curing temperature and time. The effects of copper oxide formed by thermal treatment and alkaline trea…
This is a laboratory study on the reduction of hydrochloric acid (HCl) emissions from the combustion of poly(vinyl chloride) (PVC), by in-furnace injection of calcium- and magnesium-based sorbents. Experiments were conducted in a nearly isothermal, electrically heated, drop-tube furnace, at gas temperatures of 850 and…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSoluble High-Temperature PolyterephthalamidesKenneth R. Carter, Paul T. Furuta, and Victoria GongView Author Information IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099 Cite this: Macr…
The effect of two elastomers and a newly developed plastomer on rheological, mechanical, and thermal properties of their blends with a commercially available recycled polyethylene were studied. The results show effective improvements in engineering properties of the recycled polyethylene (PE). Low percentages of these…
A new nonlinear optical crystal, 2-amino-3-nitropyridinium hydrogensulfate hydrate, has been engineered following a strategy which induces the formation of herringbone motifs of chromophores. The crystal packing of such motifs is non-centrosymmetric, with a P212121 space group. The crystal stability is lowered by the…
The effect of gel-forming (1-->3)-beta-D-glucan on the immunological activities of murine kupffer cells was examined. A branched type gel-forming (1-->3)-beta-D-glucan, GRN, was administered intravenously to mice. GRN associating to kupffer cells was detected by an immunohistochemical technique using anti-GRN antibody…
The structure and devitrification behaviour of barium borosilicate glasses, examined by Fourier transform infrared spectroscopy, x-ray diffraction and differential thermal analysis, are reported. Glass compositions are expressed generally as: (50-x/2 ) BaO. (50 -x/ 2)B 2 O 3 .xSiO 2 with x=4, 8 and 16. The progressive…
ADVERTISEMENT RETURN TO ISSUEPREVFeaturesNEXTPeer Reviewed: An Abridged Life-Cycle Assessment of Electric Vehicle Batteries Life-Cycle Assessment Nancy L. C. Steele and David T. AllenCite this: Environ. Sci. Technol. 1998, 32, 1, 40A–46APublication Date (Web):June 8, 2011Publication History Published online8 June 2011…
The acidity of synthetic Zn and Mg saponites exchanged with H+, Al3+, Na+ and K+ has been studied using DRIFTS of adsorbed pyridine and TPD–TG measurements of adsorbed n-propylamine. The characterisation with IR of adsorbed pyridine revealed the presence of a large amount of Lewis acid sites owing to coordinatively un…
The linkage isomers trans-bis[1-(2-aminoethyl)piperidine]dinitronickel(II) (brown) 1 and trans-bis[1-(2-aminoethyl)piperidine]dinitritonickel(II) (blue) 2 have been synthesized and characterised by X-ray single crystal structure analysis.