Materials Literature
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Abstract In situ surface enhanced Raman spectra (SERS) of adsorbed oxygen were obtained during oxygen adsorption and ethylene epoxidation on Ag catalyst surfaces at temperatures between 25 and 400 °C and atmospheric total pressure. Three types of Ag catalysts were investigated: (I) Ag supported on a ‐Al 2 O 3 , (II) A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of halogens with laser-ablated boron: infrared spectra of BXn (X = F, Cl, Br, I; n = 1, 2, 3) in solid argonParviz Hassanzadeh and Lester AndrewsCite this: J. Phys. Chem. 1993, 97, 19, 4910–4915Publication Date (Print):May 1, 1993Publication History Published online…
The stratification dynamics of thin circular horizontal soap films was studied experimentally. A series of metastable circular stratification domains with different thicknesses were observed. Bubble-form instabilities of Rayleigh's type always appear at the borders of the thinnest domains. It has been found that the d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and stability of poly(3,4-dibutoxythiophenevinylene) copolymersMargaret L. Blohm, James E. Pickett, and Paul C. Van DortCite this: Macromolecules 1993, 26, 11, 2704–2710Publication Date (Print):May 1, 1993Publication History Published online1 May…
Photoinduced and thermally induced bleachings of as-deposited GexS100−x and (Ge0.3S0.7)100−yAgy films were systematically studied in the ranges of 21≤x≤42 and 0≤y≤67 using optical transmission measurement. The bleachings for the Ge-S system show a maximum at around the stoichiometric composition GeS2, whereas that for…
The thermodynamic constraint relating the standard free energy of formation of an oxide (MO c ) to its oxygen potentials by Δ G f 0 (MO c ) =½ƒ o c Δ Ḡ (O 2 ) d C ′ has been used to develop the full spectrum of oxygen potentials of the U─O and Zr─O systems at high temperatures. Henry's law is applied to the metal regi…
A systematic study of cobalt site preferences has been carried out in a number of rare-earth iron compounds. The M\"ossbauer source technique employed in this work offers a direct and unambiguous way to determine quantitatively cobalt site preferences in these compounds at extremely low cobalt contents. Data quality a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe surface tension of polymer blends: theory and experimentGregory T. Dee and Bryan B. SauerCite this: Macromolecules 1993, 26, 11, 2771–2778Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 May 1993https://pubs.acs.org/do…
We performed extensive Monte Carlo simulations of a hard-sphere f.c.c. crystal near the melting transition in order to examine the validity of the widely used Gaussian ansatz for the density distribution in solids. Anisotropic deviations in the shape of the density distribution from the Gaussian form are found to be o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of Rh[P(CH3)3]2(CO)CH3 and Rh[P(CH3)3]2(CO)PhSue E. Boyd, Leslie D. Field, Trevor W. Hambley, and Martin G. PartridgeCite this: Organometallics 1993, 12, 5, 1720–1724Publication Date (Print):May 1, 1993Publication History Published online1 May…
From low-iron cultures of Vibrio fluvialis AQ 0012, two new compounds with siderophore activity were purified by XAD-7 adsorption followed by preparative TLC. Norspermidine and 2,3-dihydroxybenzoic acid were identified as constituents common to both compounds by GC-MS analyses of their acid hydrolytic products. In add…
A chemical synthesis process for producing high-quality Si[sub 3]N[sub 4] powder was developed by applying an imide decomposition method and well-controlled heat-treatment to the crystallization process. Si[sub 3]N[sub 4] powder produced by this process had superior characteristics, such as high purity, fine particle,…
This paper presents a chemical and physical analysis of the surface of polypyrrole- coated electrically conductive textiles and a study of the adhesion of polypyrrole- coated nylon fibers to epoxy using the microbond test. The chemical composition of the surface of the conductive polymer coating was determined using x…
In an offset printing factory with 56 workers, 20 (36%) developed symptomatic peripheral neuropathy due to exposure to n-hexane. Another 26 workers (46%) were found to have subclinical neuropathy. The initial change in the nerve conduction study was reduced amplitude of the sensory action potentials, followed by reduc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlycoconjugated porphyrins. 2. Synthesis of sterically constrained polyglycosylated compounds derived from tetraphenylporphyrinsPhilippe Maillard, Jean Luc Guerquin-Kern, Christiane Huel, and Michel MomenteauCite this: J. Org. Chem. 1993, 58, 10, 2774–2780Publication Date (P…
The transient transport of momentum, energy, and species during solidification of a Pb-19 percent Sn alloy is numerically simulated with and without magnetic damping. The system is contained in an axisymmetric, annular mold, which is cooled along its outer vertical wall. Since thermosolutal convection accompanies soli…
The tensile creep and creep‐recovery behavior of a unidirectional SiC‐fiber/Si 3 N 4 ‐matrix composite was investigated at 1200°C in air. A primary objective of the study was to determine how various sustained and cyclic creep loading histories would influence the creep rate, accumulated creep strain, and the amount o…
The nucleotide sequence of a 7-kilobase segment of the Bacillus subtilis chromosome containing the entire coding regions for the enzymes catalyzing the first three steps of diaminopimelate synthesis as well as dipicolinate synthase has been determined. This group of functionally related genes, termed the dap operon, w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoregulation of enzyme activity. Photochromic, transition-state-analog inhibitors of cysteine and serine proteasesPamela R. Westmark, John P. Kelly, and Bradley D. SmithCite this: J. Am. Chem. Soc. 1993, 115, 9, 3416–3419Publication Date (Print):May 1, 1993Publication His…
The structure and dynamics of the lanthanide(II1) complexes of the bis(propy1amide) of diethylenetriaminepentaacetate \n(DTPA-PA3 in aqueous solution have been investigated by I3C and I7O NMR. With the use of the longitudinal \n13C relaxation times of the NdlI1 complex it is shown that the organic ligand is bo…