Benzotriazole a corrosion inhibitor for antiques: Some practical surface chemistry
The structure and inhibitive properties of benzotriazole on copper, copper-based alloys, silver, and other metals.
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Cellulosic Insulation Material I. Overall Degradation Kinetics and Reaction Heats
Kinetic studies on the thermal and oxidative decomposition of untreated cellulosic insulation have been carried out with thermal analytical techniques (TGA and DSC) to provide input parameters for smoldering studies of this material. In dry nitrogen, the weight loss proceeds in one overall step that follows a diffusio…
Excess entropies and related quantities in glass-forming liquids
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcess entropies and related quantities in glass-forming liquidsV. P. PrivalkoCite this: J. Phys. Chem. 1980, 84, 24, 3307–3312Publication Date (Print):November 1, 1980Publication History Published online1 May 2002Published inissue 1 November 1980https://pubs.acs.org/doi/10.…
ENERGY TRANSFER FROM CAROTENOID POLYENES TO PORPHYRINS: A LIGHT‐HARVESTING ANTENNA
Abstract— Carotenoid to porphyrin singlet‐singlet energy transfer has been observed in a new covalently linked carotenoid‐porphyrin ester. Nuclear magnetic resonance studies reveal that the relatively high energy transfer efficiency (˜ 25%) is a result of a stacked conformation in which the 26 π electron carotenoid ch…
Magnetic properties of LaNi5and their variation with hydrogen absorption and desorption
The hydrogen storage compound LaNi 5 is an exchange-enhanced Pauli paramagnet with susceptibility chi (LaNi 5 )=4.6*10 -6 EMU g -1 . Hydrogen absorption leads to a decrease of the susceptibility of chi (LaNi 5 H 6.0 )=1.3*10 -6 EMU g -1 . This decrease is usually covered by a strong irreversible increase of surface ma…
PLANT ROOT GROWTH IN ACID ANDOSOLS FROM NORTHEASTERN JAPAN
Chemical and greenhouse studies were conducted to show that exchange acidity Y1, determined by titration of 125 ml of N KC1 soil extract (soil:N KC1 = 100:250) with 0.1 N NaOH, was a useful, realistic measure of aluminum toxicity potential in acid Andosols from northeastern Japan. Twenty-eight soil samples consisted o…
On the estimation of atomic charges by the X-ray method for some oxides and silicates
Based on accurate X-ray diffraction intensity data collected from spherically shaped single crystals, net atomic charges and electron density distributions have been studied for MnO, Mn2SiO4, Mg2Si2O6, LiAlSi2O6 and CaMgSi2O6. Examination of various procedures for determining atomic charges in a given structure has le…
Formation of Chemically Coprecipitated Barium Ferrite
The formation of chemically coprecipitated barium ferrite was studied using differential thermal analysis, static magnetic measurements, X‐ray analysis, and ferromagnetic resonance measurements. The investigation showed that the formation process of coprecipitated BaFe 12 O 19 differs significantly from that of conven…
Infrared absorption spectra of SiO2 precipitates of various shapes in silicon: calculated and experimental
It is shown that the infrared absorption band at 1230 cm−1, observed under certain conditions of oxygen precipitation in silicon, is the LO mode of SiO2. The LO mode, which is normally infrared inactive, becomes infrared active under the condition of polarization of small (<0.36 μm) platelets in an appropriate…
Electron capture fromKshells by fully stripped ions
Cross sections for electron capture from inner shells by fully stripped ions are calculated and compared with data for $K$-shell vacancy production. A procedure for inclusion of the relativistic effect is developed, and the scheme of calculations is illustrated through sample evaluations of electron-capture cross sect…
La forme γ du dichlorure de calcium tétrahydraté
CaCI2.4H20, P2~/c, a = 6. 1387 (9), b = 7. 6669 (12), c -: 8 . 9014 (3 7) A, fl= 111.00(3) ° , V= 391 /k 3, Z = 2, d x = 1-55 Mg m -3. The Ca atoms are surrounded by two CI atoms and four water mole- cules. The cohesion between the CaCI2.4H20 oc- tahedra is achieved by hydrogen bonds. The final R value is 0.046.
OCCURRENCE AND CHARACTERISTICS OF FERROMANGANIFEROUS CONCRETIONS IN SOME SASKATCHEWAN SOILS
The distribution, composition and nature of concretions occurring in some moderately well-drained to poorly drained soils of Saskatchewan were investigated. The soils selected were: Gleyed Humo-Ferric Podzol, Orthic Luvic Gleysol, Orthic Gray Luvisol and Gleyed Gray Luvisol. The concretions range from < 0.1 to >…
Effects of the lapped surface layers on the dielectric properties of ferroelectric ceramics
The effects of lapped surface layers on the dielectric properties of Ba- and Sr-modified lead titanate and lead zirconate ferroelectric ceramics are examined. Specimens with lapped surfaces show anomalous dielectric behaviors, namely, smaller dielectric constant, higher Curie temperature, smaller dielectric loss (belo…
Mechanically bistable liquid-crystal display structures
This paper discusses two types of mechanically bistable liquid-crystal display structures, a previously reported type [2], [3] called vertical-horizontal, and a second type, called horizontal-horizontal. In both of them, the director configuration is planar. They are distinguished by the orientation of the director pl…
Fracture of Polycrystalline MgAl 2 O 4
The fracture toughness of stoichiometric polycrystalline MgAl 2 O 4 was measured as a function of grain size and temperature to 1400°C. The room temperature fracture toughnesses are comparable to reported single‐crystal values. No effect of grain size was detected. Two regions of K I c = f ( T ) were observed, both sh…
Precursive Blistering in the Localized Corrosion of Aluminum
Observations have been made which indicate that blister formation is a general step in the pit initiation process in aluminum in aqueous chloride solutions. Evidence is presented which clearly shows that the oxide film is overtly broken by the mechanical stress resulting from the gas pressure in such blisters. The ste…
Zur Kenntnis farbiger ternärer und quaternärer Zintl-Phasen / Coloured Ternary and Quaternary Zintl-Phases
Abstract Ternary and quaternary, mostly coloured compounds of Au, Pd and Pt, resp., with Li, Mg, Sc and Sn were prepared and structurally investigated. They crystallize in a "filled" Zinkblende type structure (space group F?3m) and can be characterized as ternary or quaternary Zintl-phases. Colours seem to depend on u…
Liquid Crystal Orientation on the Surface of Obliquely-Evaporated Silicon Monoxide with Homeotropic Surface Treatment
We have investigated the liquid crystal molecular orientation on a surface coated by oblique evaporation of SiO followed by treatment with homeotropic surface coupling agents. This is found to be a useful technique for obtaining the liquid crystal orientation with a small pretilt from homeotropic alignment. The orient…
Defect structure and oxygen diffusion in undoped and La-doped polycrystalline barium titanate
Oxygen diffusion coefficients in undoped and La-doped polycrystalline barium titanate were measured at an ambient oxygen pressure of about 40 Torr over the temperature range 770–1430 °C by a solid–gas exchange technique of O18. The undoped material was characterized only by an extrinsic region with a high diffusivity,…
Investigation of photoelectrochemical corrosion of semiconductors. 1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of photoelectrochemical corrosion of semiconductors. 1K. W. Frese Jr., M. J. Madou, and S. R. MorrisonCite this: J. Phys. Chem. 1980, 84, 24, 3172–3178Publication Date (Print):November 1, 1980Publication History Published online1 May 2002Published inissue 1 Nov…