Materials Literature
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The lifetimes of the lowest energy excited states of V(bpy)32+ (bpy = 2,2/-bipyridine) and V(phen)32+ (phen = 1,10-phenanthroline) are 500 ps and 1.8 ns, respectively, in ethanol at room temperature. These lifetimes are much shorter than those for the isoelectronic chromium(III) complexes. The lowest energy excited st…
The kinetics of dissolution of powdered bovine enamel and of human enamel, both untreated and extracted with either hypochlorite or chloroform, has been studied using a constant solution composition technique in undersaturated solutions of calcium phosphate (total molar calcium concentration, TCa = 0.3 to 13.1 X 10(-3…
Tritium interactions with graphite will influence the design of procedures for handling graphite components. The tritium sorption capacities of various graphite grades are therefore needed. In a series of measurements, several graphite specimens in different states of oxidation were exposed to tritium gas and to triti…
Abstract Erstmals in Form von Einkristallen wurden Li 8 IrO 6 (dunkelviolett, a = 541,51, c = 1505,84 pm), Li 8 PtO 6 (gelbgrün/transparent, a = 541,46, c = 1501,43 pm) sowie Li 8 CeO 6 (farblos/transparent, a = 564,30, c = 1602,71 pm) röntgenographisch untersucht. Der Madelunganteil der Gitterenergie, MAPLE, sowie Ef…
Hydroxypropyl cellulose (HPC) forms liquid-crystalline solutions in both water and methanol. When these solutions are sheared, the banded texture seen in many liquid-crystalline polymers is formed. Detailed optical microscopy of the bands has been carried out, showing that the bands arise from a smooth variation in th…
The annealing of sintered (MnZn)Fe2O4in a controlled atmosphere improves the apparent electrical resistivity through the reduction of the ferrous ion content. The initial permeability, however, is degraded as a result of annealing. It is suggested that stringent control of the oxygen partial pressure at an earlier sta…
Useful properties of eutectic alloys have been found to relate to the presence of granulated discontinuous phase, and its formation is encouraged during solidification; although difficulties are encountered in some alloy systems. In the present paper it is suggested that discontinuous phase granulation can be achieved…
It is shown that the purely static (magnetic or electric) field-induced Fr\'eedericksz transition in a planar parallel oriented nematic-liquid-crystal cell is always second order. But with an additional optical field, the magnetic-field-induced Fr\'eedericksz transition can become first order and bistable. For the ele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of hydroperoxo with free radicalsMichael MozurkewichCite this: J. Phys. Chem. 1986, 90, 10, 2216–2221Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1 May 1986https://pubs.acs.org/doi/10.1021/j100401a044https://do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAseptic packaging of liquid food products: a literature reviewBernhard A. H. Von Bockelmann and Irene L. I. Von BockelmannCite this: J. Agric. Food Chem. 1986, 34, 3, 384–392Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1…
Electro-optic effects in newly synthesized ferroelectric liquid crystals (2S,3S)-3-methyl-2-halopentanoic acid 4',4''-alkoxybiphenyl ester have been studied and it is clarified that these materials demonstrate low threshold fields and high response speeds of electro-optic effects corresponding to their large spontaneo…
Abstract The damping function, D.F., as derived from the area under the linear E ″ — temperature curve, expresses the amount of mechanical energy converted to heat per unit volume of material. Sometimes characteristics of the damping behavior of homopolymers and IPN's are more apparent in the linear E ″ —temperature p…
Abstract We have used an optical interference technique to measure the dilation of polystyrene films in the presence of carbon dioxide or helium at pressures up to 20 atm. Dilation isotherms (plots of dilation versus gas pressure at constant temperature) were obtained for three samples of polystyrene which had widely…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the charge-transfer salt of decamethylferrocenium and tricyanomethanide, [Fe(C5Me5)2]+/[C(CN)3]-. The electronic structure and spectra of the tricyanomethanide ionDavid A. Dixon, Joseph C. Calabrese, and Joel S. MillerCite this: J. Am. Chem…
The electrochemical potentiokinetic reactivation (EPR) method has recently become a popular test for evaluating the intergranular attack (IGA) of high-nickel alloys and different types of stainless steels (SSs). The EPR method was used in a study on the IGA and intergranular stress corrosion cracking (IGSCC) of a high…
Yttrium hydroxide gel was dried by five techniques to study their influences on the sintering behavior of yttria. Dried precursors, calcined and sintered oxides, and the initial gel were examined via Fourier transform infrared photoacoustic and/or attenuated total reflection spectroscopies. Carbonate was found to be i…
Abstract The residence time distribution of poly(vinyl chloride) (PVC) polymers in a counterrotating twin screw commercial extruder was determined and analyzed. The experimental technique involved the use of manganese dioxide as a tracer after being neutron activated and was injected into the extruder during normal op…
The dehydration, transformation, and densification of boehmite (γ‐AlOOH) are enhanced by addition of γ‐Al 2 O 3 seed particles. α‐Al 2 O 3 microstructures with uniform 1‐ to 2‐μm grain size and sintered densities 98% of theoretical are achieved at 1300°C Thermal analysis shows that γ‐Al 2 O 3 seed particles transform…
The thermodynamic properties of a spin system with two different nearest-neighbor interactions which are ordered in a quasiperiodic pattern along a one-dimensional chain are studied. An exact renormalization technique is used which mimics the deflation rule for a quasiperiodic lattice. The system has a phase transitio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical analysis of the bonding in octahedral transition-metal clusters containing .mu.-acceptor and .mu.-donor bridging ligands and their nido and arachno derivativesRoy L. Johnston and D. Michael P. MinggosCite this: Inorg. Chem. 1986, 25, 10, 1661–1671Publication Date…