Materials Literature
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Abstract Oxidative polymerization of aniline using the H 2 O 2 ‐FeSO 4 system gave polyaniline under mild conditions. The prepared powdery emeraldine base, a form of polyaniline, is blue black and shows high solubility in organic solvents (e.g., ca. 200 mg/mL in N ‐methylpyrrolidone). The number‐average molecular weig…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization behavior and its influence on the mechanical properties of a thermoplastic elastomer produced by Pseudomonas oleovoransK. D. Gagnon, R. W. Lenz, R. J. Farris, and R. C. FullerCite this: Macromolecules 1992, 25, 14, 3723–3728Publication Date (Print):July 1, 19…
A new power and ground network design problem for cell-based VLSIS is discussed. In contrast to the conventional method, the network topology is optimized, or wiring resource consumptions subject to electromigraton and voltage drop constraints is minimized. The results obtained show that this problem is a critical iss…
The chemistry of iodomethane on a Cu(111) surface has been studied by a combination of work function measurements, Auger electron spectroscopy, high-resolution electron energy-loss spectroscopy, and temperature programmed reaction spectroscopy. Our results show that iodomethane dissociates below 200 K to form iodine a…
Work function and band bending measurements are performed on n- and p-type GaAs(100) surfaces prepared by molecular-beam epitaxy and As decapping. The band bending is almost independent of the decapping temperature and surface reconstruction [(1×1)→C(4×4)→C(2×8)→(4×2)]. The work function and electron affinity undergo…
It is shown in this paper that the reflectivity of X-rays at smooth and fiat surfaces gives the dispersive correction f′(E) to the atomic form factor with an accuracy comparable to that obtained by X-ray interferometry. A detailed set of values of f′(E) in the energy range 7–27 keV is given for Ni, Cu, CuO, Ta, LiTaO3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMass spectrometric detection of the noncovalent GDP-bound conformational state of the human H-ras proteinAshit K. Ganguly, Birendra N. Pramanik, Anthony Tsarbopoulos, Thomas R. Covey, Eric Huang, and Shella A. FuhrmanCite this: J. Am. Chem. Soc. 1992, 114, 16, 6559–6560Publi…
A new type of decagonal phase having superlattice order has been found in an AI70Ni15Co15 alloy by means of the electron diffraction technique. Most of the grains in the Al70Ni15Co15 sample heat treated at 600°C for 216h exhibit superlattice order. In contrast, superlattice order has not been seen for the Al65Cu20Co15…
Recent advances in the development of high quality thin films of ferroelectric materials have created renewed interest in ferroelectric random access memory (FERRAM) devices. At the present time, several groups are pursuing the development of FERRAMs, where a thin film ferroelectric capacitor memory element is integra…
Mechanical compression tests were applied to a few alloys, either truly quasicrystalline or made of approximant, crystalline phases with large unit cells. A1-Cu-Co-Si, A1-Cu-Fe-Cr-Si-(B) and A1-Cu-Fe-(B) alloys are brittle materials at low temperature but they show high plasticity at temperatures beyond 625-650°C. In…
Monochromatized angularly resolved x-ray photoelectron spectroscopy (ARXPS) was used to study PTFE (Teflon) that had been exposed to an Earth orbital environment for approximately six years. The primary interest of the research is on a very reactive component of this environment (atomic oxygen) which, because of the t…
ombustion toxicology represents a unique combination of the dis-C ciplines of materials science, fire science and inhalation toxicology. With an understanding of the flammability properties of a material and the type or stage of a fire most likely to subject the material to ap-preciable combustion and/or thermal decom…
Abstract The 15 N NMR spectra of five N ‐( o ‐aminophenyl)‐ N ′ substituted ureas and their hydrochloride salts were recorded in DMSO. N‐1 was more shielded in these ureas than in N ‐phenyl‐ N ′‐methylurea. The shifts of N‐3 varied with the substituents. Proton exchanges at N‐3 were observed when the spectra of the hy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure-property comparison of sulfonated and carboxylated telechelic ionomers based on polyisopreneL. N. Venkateshwaran, M. R. Tant, G. L. Wilkes, P. Charlier, and R. JeromeCite this: Macromolecules 1992, 25, 15, 3996–4001Publication Date (Print):July 1, 1992Publication H…
Abstract Polymers possess great significance in data storage technology. Taking as an example electrical and optical data storage, the state of development, properties required and opportunities for application of selected polymers are discussed, namely: (i) ferroelectric polymers with low switching voltages and extre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic resonance studies of ammonia adsorption and decomposition on titania-supported vanadia catalystsMarjorie S. Went and Jeffrey A. ReimerCite this: J. Am. Chem. Soc. 1992, 114, 14, 5768–5775Publication Date (Print):July 1, 1992Publication History Published online1 May…
Abstract A peak‐to‐background ( P / B ) method was implemented for standardless analysis of bulk samples. Components of the model were selected from the literature on the basis of comparison with the present experimental results. Pouchou and Pichoir's characteristic x‐ray intensity calculations combined with Small et…
The properties of modified HDPE, selected from various polymer materials by evaluations of DC characteristics, were examined in both sheet and cable samples. It was found that the modification, which introduced a small amount of polar group into HDPE, considerably enhanced DC breakdown strength to as high as 1.5-2.0 t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectroscopic and thermoanalytical studies of the reaction of barium hydroxide with anatase and titanium oxide gelsPrabir K. Dutta, Patrick K. Gallagher, and Jen TwuCite this: Chem. Mater. 1992, 4, 4, 847–851Publication Date (Print):July 1, 1992Publication History Publ…
Abstract The photoluminescence (PL) spectra of the basic extended defects in Si are obtained. A new classification of the PL lines is proposed according to the squared edge components of the Burger's vectors of the dislocations which surround the structural defects. The different manifold splitting of the various disl…