Materials Literature
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Abstract A series of screening tests have been performed to determine the chemical types needed for chelating iron (Fe+++) at concentrations as high as 50,000 ppm in spent acid. The chemicals tested were liquid citric acid (LCA), nitrilotriacetate (NTA) and acetic acid (AA). A blend of liquid citric acid and nitrilotr…
We present the optical properties of poly (2,2' bithiophene) and show that this material exhibits electrochromic behavior.
Abstract Although the chemistry of scale formation and inhibition downhole and in surface equipment for oilfield and geothermal applications continues to be studied extensively, the mechanism by which it occurs has not been given sufficient attention. In this paper, the chemistry of precipitation and scale formation i…
The diffusion behavior of β phase Cu–Al has been studied at 800, 850, and 950 °C using the experimental approach and analysis scheme of Kirkendall and Darken. Diffusion couples were made using the window frame technique and concentration profiles were determined by electron probe microanalysis. The chemical diffusion…
Nickel‐containing mixed‐alkali borate glasses were prepared and their spectral absorption in the visible and near‐ir were measured and used to determine the ligand field strength, Racah parameter, and state of coordination of Ni 2+ ions. The change in these parameters with alkali content is discussed in terms of mixed…
Abstract Previous investigations indicate a trend in which montmorillonoids (smectites, 17 Aa) are enriched relative to illite (10 Aa) and chlorite (7 Aa) in Holocene lutites, whereas illite and chlorite dominate in late Pleistocene deposits. The apparent crystallinity of all clay-mineral groups declines from Pleistoc…
ABSTRACT Epilithic and epiphytic diatoms were collected monthly from 18 June 1979 through 19 May 1980 from both shaded and unshaded sites of Sessums Creek, a shallow, oligotrophic and strongly alkaline stream in northeastern Mississippi. The dominant macroalgae were filamentous green algae belonging to the non‐mucilag…
The concentration of As—As bonds in the AsS x system has been determined by chemical analysis. Over the whole range of composition examined, x = 1–1·61, a higher concentration of As—As bonds was found in comparison with the expected value. Under a simplifying assumption, i.e. that only three types of structural unit (…
Abstract The exotherms of the reactions leading to the formation of polyurethane foams were measured. The inflection points of the exotherm curves were made evident by continuous differentiation with respect to time. The position and magnitude of the inflection points demonstrated the sequential nature of the reaction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the nature of other ligands on the rate of nitrito-to-nitro linkage isomerization of octahedral cobalt(III)-amine complexes in aqueous solutionKatsuhiko Miyoshi, Noriko Katoda, and Hayami YonedaCite this: Inorg. Chem. 1983, 22, 13, 1839–1843Publication Date (Print)…
A series of substituted 1,3-diaryltriazenes has been synthesized and tested for anorectic activity. Several members of the series were effective; one compound, 1,3-bis[2-cyano-5-(trifluoromethyl)phenyl]triazene, was particularly active, causing weight loss in rats, dogs, and squirrel monkeys. It was devoid of overt ce…
Abstract A quantitative evaluation of RBS data resulted in data for the parabolic reaction rate constants for the reaction between Al 2 O 3 and NiO at temperatures from 960°C up to 1105°C. The activation energy and the preexponential factor were in good agreement with literature data. The experimental data of this wor…
Oxygen self-diffusion coefficients in Fe-doped MgO single crystals were determined by an isotope exchange technique. The results indicated dopant-insensitive diffusion, which was interpreted as due to the vacancy pair mechanism.
The alteration of CsAlSi 5 O 12 , a possible host for 137 Cs in tailored nuclear waste ceramics, was studied under simulated nuclear waste repository conditions of 100°, 200°, and 300°C with a confining pressure of 30 MPa. The cesium radiophase was found to be quite stable in water or 3N CaCl 2 , or 3N MgCl 2 but not…
The optical absorption of high lead borate and lead silicate glasses containing manganese before and after γ‐ray irradiation was studied. To separate the absorption due to manganese from the intrinsic absorption, blank glasses were prepared and measured. The results showed that the visible absorption band before and a…
During the pitting of magnesium in chloride solution a film of magnesium chloride forms on the corroding surface. This salt film is apparently a diffusion barrier for water and prevents repassivation by oxide. Properties of magnesium chloride layers were determined on corroding, high purity magnesium shielded electrod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacteristic ratios of atactic poly(vinylethylene) and poly(ethylethylene)Zhongde Xu, Nikos Hadjichristidis, Jose M. Carella, and Lewis J. FettersCite this: Macromolecules 1983, 16, 6, 925–929Publication Date (Print):June 1, 1983Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal EPR of the oxygen-17-enriched dioxygen adduct of vitamin B12r: reversible oxygen bonding, electronic and geometric structure and molecular dynamicsE. Joerin, A. Schweiger, and H. H. GuenthardCite this: J. Am. Chem. Soc. 1983, 105, 13, 4277–4286Publication Date…
The development of a model for a consistent prediction of metal fire in high pressure oxygen has been attempted. The reaction schemes and reaction rates of metal oxidation are inferred, and the burning region spread rates are predicted. The burning region spread rate V over an infinite thickness piece is shown to depe…
A theory describing bulk better operation is presented. The theory is applicable to a diatomic gas which adsorbs dissociatively on a getter material which exhibits a time independent sticking coefficient. The theory includes the effects of surface reactions and bulk diffusion. Exact numerical solutions are presented f…