Oxidation by Mn207: An impressive demonstration of the powerful oxidizing property of dimanganeseheptoxide
Demonstrates the formation of Mn2O7 and its powerful oxidation of simple alcohols.
Materials Literature
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Dynamics of luminescence from Ru(bpy)3Cl2 adsorbed on semiconductor surfaces
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of luminescence from Ru(bpy)3Cl2 adsorbed on semiconductor surfacesTakashi Kajiwara, Kazuhito Hashimoto, Tomoji Kawai, and Tadayoshi SakataCite this: J. Phys. Chem. 1982, 86, 23, 4516–4522Publication Date (Print):November 1, 1982Publication History Published online1…
Isolated ultracold porphyrins in supersonic expansions. I. Free-base tetraphenylporphyrin and Zn-tetraphenylporphyrin
In this paper we report the results of an experimental study of the fluorescence excitation spectra and of the time-resolved emission of Zn-tetraphenylporphyrin (ZnTPP) and of free-base tetraphenylporphyrin (H2TPP) seeded in pulsed supersonic expansions of He. We have studied the S0→S1 transition (the Q band) and the…
Metal ion exchange reactions in cage molecules: the systems [M4-nM'n(SC6H5)10]2- (M, M' = Fe(II), Co(II), Zn(II), Cd(II)) with adamantane-like stereochemistry and the structure of [Fe4(SC6H5)10]2-
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal ion exchange reactions in cage molecules: the systems [M4-nM'n(SC6H5)10]2- (M, M' = Fe(II), Co(II), Zn(II), Cd(II)) with adamantane-like stereochemistry and the structure of [Fe4(SC6H5)10]2-K. S. Hagen, D. W. Stephan, and R. H. HolmCite this: Inorg. Chem. 1982, 21, 11,…
Arterial Regeneration Over Absorbable Prostheses
Small-vessel arterial replacement by a prosthetic material elicits inflammatory and regenerative reactions that alter the patency rate of the resultant prosthesis-tissue complex. Woven absorbable polyglycolic acid prostheses, 24 mm in length, were implanted into adult rabbit aortas and followed for 7 1/2 months. At th…
Crystal Structure Determination of Antiferroelectric PbZrO3–Application of Profile Analysis Method to Powder Method of X-ray and Neutron Diffraction–
Crystal structure of antiferroelectric PbZrO 3 has been studied at room temperature by adopting X-ray and neutron profile analysis methods. A considerable refinement of the structure has been made on a previous model which has generally been accepted in these 20 years. In contrast to the old model which has a large sp…
Physical origin of losses in conducting ferromagnetic materials (invited)
The physical origin of losses in conducting ferromagnetic materials is the production of heat by the flow of eddy currents in the material. The eddy currents are generated by the voltages caused by changes in the magnetic induction. This statement, although true, is not very helpful in calculating or predicting the ac…
Threshold tear strength of elastomers
Abstract Tear strengths have been measured for a wide variety of molecular networks under threshold conditions; i.e., at high temperatures, low rates of tearing, and with swollen samples. For all of the polymers examined, the threshold tear strength was found to be proportional to the square root of the average molecu…
Simultaneous static and dynamic light scattering
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimultaneous static and dynamic light scatteringS. Bantle, Manfred Schmidt, and Walther BurchardCite this: Macromolecules 1982, 15, 6, 1604–1609Publication Date (Print):November 1, 1982Publication History Published online1 May 2002Published inissue 1 November 1982https://pub…
The microstructure of injection‐molded semicrystalline polymers: A review
Abstract The microstructure of semicrystalline polymers solidified with and without concurrent applied strain is reviewed. Fluid flow in the filling and packing stages of injection‐molding are discussed. Observations of the microstructures of a number of polymers under various conditions are described. In general, the…
Properties of hydrogenated amorphous carbon films and the effects of doping
Amorphous carbon films have been prepared in a r.f. glow discharge from various hydrocarbon gases. Electrical conductivity and optical absorption measurements show a strong dependence on the preparation gas and on the substrate temperature T d. Particularly for specimens prepared from ethylene, varying T d from 230 to…
Mode amplitudes in dynamic light scattering by concentrated liquid suspensions of polydisperse hard spheres
This paper concerns the dynamic light scattering by suspensions of polydisperse hard spherical particles. It is concluded that for relatively high volume fractions and fairly narrow distributions, the light scattering correlation function should, to a good degree of approximation, be composed of two independent modes…
Liposomes as in vivo carriers of adriamycin: reduced cardiac uptake and preserved antitumor activity in mice.
Abstract Neutral and negatively charged liposomes containing Adriamycin (ADM) were examined for the efficiency of drug entrapment, serum stability, in vivo tissue distribution, and tumor-inhibitory activity. Entrapment of ADM in negatively charged liposomes containing phosphatidylserine (PS) or cardiolipin (DPG) was 3…
Temperature dependence of the enthalpy and the heat capacity of the liquid-crystal octylcyanobiphenyl (8CB)
An adiabatic scanning calorimeter has been used to study the thermal behavior of the liquid-crystal octylcyanobiphenyl (8CB) in the temperature range between 10 and 50\ifmmode^\circ\else\textdegree\fi{}C. The solid---to---smectic-$A$ ($\mathrm{KA}$), the smectic-$A$---to---nematic ($\mathrm{AN}$), as well as the nemat…
Sedimentation in a dilute polydisperse system of interacting spheres. Part 2. Numerical results
Analytical formulae or the effect of interaction between pairs of rigid spherical particles on the mean velocity of each species in a statistically homogeneous dilute polydisperse system were given in Part 1 (Batchelor 1982), and are here evaluated numerically. We have calculated the pair-distribution function and the…
Dinuclear copper(II) cryptates of macrocyclic ligands: synthesis, crystal structure, and magnetic properties. Mechanism of the exchange interaction through bridging azido ligands
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDinuclear copper(II) cryptates of macrocyclic ligands: synthesis, crystal structure, and magnetic properties. Mechanism of the exchange interaction through bridging azido ligandsJacques Comarmond, Pierre Plumere, Jean Marie Lehn, Yvette Agnus, Remy Louis, Raymond Weiss, Oliv…
Crystal structures of Escherichia coli and Lactobacillus casei dihydrofolate reductase refined at 1.7 A resolution. I. General features and binding of methotrexate.
X-ray data have been extended to 1.7 A for a binary complex of Escherichia coli dihydrofolate reductase with methotrexate and a ternary complex of Lactobacillus casei dihydrofolate reductase with methotrexate and NADPH. Models for both structures have been refined to R factors of 0.15 and include parameters for fixed…
The CNDO/S3 crystal orbital model: Definition and application to polyacetylene
The CNDO/S3 model, a spectroscopically parametrized complete neglect of differential overlap molecular orbital method, is extended to encompass the description of radical cation states in infinite periodic quasi-one-dimensional molecules. Detailed model calculations of the energy bands and density of valence electron…
Mechanistic dissimilarities between environmentally influenced fatigue-crack propagation at near-threshold and higher growth rates in lower strength steels
The role of hydrogen gas in influencing fatigue-crack propagation is examined for several classes of lower strength pressure-vessel and piping steels. Based on measurements over a wide range of growth rates from 10−8 to 10−2 mm/cycle, crack-propagation rates are found to be significantly higher in dehumidified gaseous…
Experiments on Director Waves in Nematic Liquid Crystals
In a homeotropic nematic cell, a solitarylike director wave is excited by a mechanical method. Three photographs of the wave propagation process and measured velocity-time dependence curves are presented. By means of the interference patterns of focused polarized light, it was found that the dark lines observed in whi…