Materials Literature
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Abstract The effects of molecular structure on the dicumyl peroxide crosslinking of two low density polyethylenes have been studied. Peroxide efficiency was determined largely by the content of terminal vinyls in the two polymers. Differences in molecular weight distribution and branch content had comparatively little…
The nature and strength of bonding of carbon dioxide to a high area (136 m2g-1) polycrystalline copper supported on silica has been determined by the combined techniques of Fourier transform infrared spectroscopy (FTIR) and temperature programmed desorption (TPD). These show the room temperature interaction to be init…
The aerobactin operon of the virulence plasmid pColV-K30 of Escherichia coli K12 consists of four genes for biosynthesis and one for transport of the siderophore. Regulation by iron occurs at the transcriptional level and is mediated by a ferrous iron binding protein designated Fur (ferric uptake regulation). The meta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBulk semiconductors from molecular solids: a mechanistic investigationW. E. Farneth, N. Herron, and Y. WangCite this: Chem. Mater. 1992, 4, 4, 916–922Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization techniques for the study of silica fragmentation in the early stages of ethylene polymerizationWalter D. Niegisch, Salvatore T. Crisafulli, Tatyana S. Nagel, and Burkhard E. WagnerCite this: Macromolecules 1992, 25, 15, 3910–3916Publication Date (Print):July…
Low-energy electron diffraction, soft x-ray photoemission, cathodoluminescence (CL), and Auger electron spectroscopies have been performed to investigate the geometric, chemical, and electronic properties of GaAs (100) surfaces as a function of annealing temperature and surface reconstruction. These measurements indic…
Abstract Melt blends of nylon‐6/modified ABS (acrylonitrile‐butadiene‐styrene terpolymer) have been prepared using a single screw extruder. Electron microscopic observations revealed that the rubber particles are as finely dispersed as in ABS. Both the heat of fusion and the dynamic storage modulus of the blends were…
The nature of the porphyrin pi-cation radicals in the horseradish peroxidase and bovine liver catalase (BLC) compound I species have been investigated by studying their resonance Raman spectra. A variety of laser excitation and sample interrogation procedures have been employed in order to minimize previously document…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDihydrogen complexes of metalloporphyrins: characterization and catalytic hydrogen oxidation activityJames P. Collman, Paul S. Wagenknecht, James E. Hutchison, Nathan S. Lewis, Michel Angel Lopez, Roger Guilard, Maurice L'Her, Aksel A. Bothner-By, and P. K. MishraCite this:…
The chemisorption and reaction of dichlorosilane (SiH2Cl2) with Si(111) and Si(100) surfaces is investigated with core-level soft x-ray photoelectron spectroscopy employing synchrotron radiation, in order to ascertain the surface chemistry involved in atomic layer epitaxy (ALE). Exposures to 8 kL of SiH2Cl2 were perfo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew thermally stable hydroperoxo- and peroxo-copper complexesMohammad Mahroof-Tahir, Narasappa Narasimha Murthy, Kenneth D. Karlin, Ninian J. Blackburn, Shahid N. Shaikh, and Jon ZubietaCite this: Inorg. Chem. 1992, 31, 14, 3001–3003Publication Date (Print):July 1, 1992Publi…
This paper describes experimental studies of the distributions of ligand field sites occupied by ${\mathrm{Cr}}^{3+}$ dopant ions in inorganic glasses with different chemical compositions. The effects of site-to-site disorder are observed via the steady-state spectral band-shape and decay patterns of $^{4}$${\mathit{T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInduction of noncentrosymmetry by polar hydrogen-bonded chains in nitroaniline crystalsMargaret C. Etter and Kin Shan HuangCite this: Chem. Mater. 1992, 4, 4, 824–827Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1…
New relaxation processes are observed in ferroelectric liquid crystals with considerable high spontaneous polarization. These processes are attributed to the formation of ferroelectric domains in FLC cells. The domains have different characteristic periodicities and relaxation times in the bulk of FLC cell and near th…
A fine grain diamond film has been developed by microwave plasma assisted chemical vapor deposition. Various analytical techniques, including Rutherford backscattering, proton recoil analysis, Raman spectroscopy, and X-ray diffraction, were utilized to characterize the diamond films. The grain size of the film was det…
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…