Materials Literature
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We use a 9-carbon model compound to describe a proposed mechanism for homoepitaxial growth of diamond from methyl radicals on a hydrogenated, electrically neutral (100) surface. We estimate enthalpy and entropy changes for each step in the mechanism using group additivity methods, taking into account the types of bond…
The thermal properties of 4-cyanophenyl 4-(3,4-dialkoxybenzoyloxy)benzoates (1), 4-(3,4-dialkoxybenzoyloxy)phenyl 4-cyanobenzoates (2), 4-cyanophenyl 4-(2,4-dialkoxybenzoyloxy)benzoates (3) 4-(2,4-dialkoxybenzoyloxy)phenyl 4-cyanobenzoates (4), and some related compounds have been examined. Series 1 and 2 show a smect…
Scale Inhibitor Evaluations And A Mechanism Of Inhibition Of Sparingly Soluble Salts Mason B. Tomson; Mason B. Tomson Rice University Search for other works by this author on: This Site Google Scholar J. Matty; J. Matty Central Michigan University Search for other works by this author on: This Site Google Scholar J.E.…
The creep of a Pb–2·5Sb–0·2Sn alloy has been studied at stresses up to 6·5 MN m−2 in the temperature range 318–348 K (0·53–0·58Tm) using helical specimens. At 333 K, a transition in the stress exponent from ~1 to 3 occurred at ~3 MN m−2. The observed good agreements below the transition stress, both for experimental d…
Abstract cis-Dioxo (tetraphenylporphyrinato)molybdenum(VI) [MoVI(O)2(tpp)] (tpp=5,10,15,20-tetraphenylporphyrinato) is easily prepared by the pyrolysis of the corresponding diperoxoporphyrinato complex [MoVI(O2)2(tpp)] releasing dioxygen gas at 200 °C under 10−3–10−4 Torr (1 Torr≈133.3 Pa).
Evaporated gold films and gold films etched by argon ion bombardment to the same thickness are known to exhibit different optical and electrical properties. Transmission electron microscope observations presented in this paper confirm that these differences are caused by different growth/etch film morphologies. The de…
Abstract The luminescence spectra and radiative lifetimes of a series of d 3 and d 6 double complex compounds with bipyridine (bip), phenanthroline (phen), ammonia and ethylenediamine (en) ligands in the cations and chloride, cyanide, thiocyanide and oxalate (ox) ligands in the anions have been investigated at tempera…
Glycyl-l-alanine hydrobromide monohydrate and glycyl-l-alanine hydroiodide monohydrate (H2N-CH2-CO-NH-CH(CH3)-COOH·HX·H2O; (X=Br, l) are iso-structural and crystallize with the space group C2 2- P21, with two molecules in the unit cell. Therefore both compounds possess one polar axis parallel to the b-axis and they ar…
Abstract Micro‐Raman spectra of crystalline uridine were obtained at room temperature and at pressures approaching 40 kbar with the aid of a diamond‐anvil cell. There is evidence for a phase transition at about 12 kbar which is probably associated with changes in the hydrogen‐bonding interactions between the two molec…
This paper discusses the effect of applied tension, specimen size, fabric sett, and shear strain on the shear behavior of fabrics using the twist method of measurement. Shear behavior depends critically on applied tension, specimen size, and fabric sett. The specimen size does not seem to affect the coercive shear str…
Thin cerium overlayers, 3-10 Å, on aluminum are found to enhance dramatically the oxidation of the substrate at room temperature. Two logarithmic oxidation regimes are observed in the growth curve, one is assigned to the formation of a thin layer of a mixed Ce-Al oxide, and the other to the growth of bulk Al oxide.
Abstract Das Forschungsvorhaben zielte darauf ab, den Einfluß unterschiedlicher Korrosionsparameter auf die Korrosionsschwingfestigkeit von mit 13 bzw. 17% Chrom legierten Stahlgußwerkstoffen für Wasserkraftanlagen im Bereich hoher Schwingspiele (10 6 < N < 10 8 ) zu erfassen. Dabei wurde der gesamte Bereich der…
Raman spectroscopy of ${\mathrm{Li}}_{2}$${\mathrm{SO}}_{4}$ was performed for pressures in the range 1 bar to 80 kbar. The crystal remains in the original \ensuremath{\beta} phase if the pressure is kept below 13 kbar. At this pressure the spectrum undergoes qualitative changes in a continuous way as a function of ti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn ab initio characterization of the tetraphosphorus oxide P4OLawrence L. LohrCite this: J. Phys. Chem. 1990, 94, 12, 4832–4835Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 June 1990https://pubs.acs.org/doi/10.1021/j10…
Physical properties of stoichiometric and non stoichiometric CuO are reported. The electrical conductivity has been measured on CuO pellets, sintered with the usual procedure for the preparation of Y Ba-Cu O superconductors and then deoxygenated under a nitrogen flow. It is shown that oxygen deficient CuO pellets pres…
Impact strength of nylon 6 was more than tripled by incorporation of 10% low-density polyethylene, ethylene/acrylic acid copolymers, or chlorinated polyethylenes. Chlorinated polyethylenes containing 36-42% of chlorine generally gave best retention of tensile and flexural modulus and strength characteristics.
The influence of heat treatment (heating followed by quenching prior to charging) on charge storage in fluoroethylenepropylene (FEP) and polypropylene (PP) foils is studied by a corona discharge or by a mono-energetic electron beam. The variables which affect the charge decay time and the TSD (thermally stimulated dis…
Abstract The XPS (x–ray photoelectron spectroscopy) O1s spectrum of PET [poly(ethylene terephthalate)] was examined in detail. Spectra of related compounds were also studied for comparison. The O1s peak profile of asymmetric doublet with π–π * satellites characteristic of PET was successfully explained both from compa…
An analysis is presented of the effect of tilt in the high-strain-rate pressure-shear plate impact experiment. Normal and shear tractions and the velocity difference across the specimen are obtained from free-surface particle velocity, tilt angle, closure direction, and impact velocity data. The effect of tilt in high…
Factors affecting the slope of the reactive ion etched molybdenum line have been studied with a simulation method and with experiments. Plasma chemistry and process parameters of the CF 4 / O 2 mixture for the molybdenum etch have been examined. The theoretical calculation matches experimental results. Surface topogra…