Materials Literature
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Abstract Linear dichroism and fluorescence depolarization measurements on chlorophyll a and chlorophyll b molecules incorporated into macroscopically oriented multibilayers of the plant lipid digalactosyldiacylglycerol (DGDG) are presented. The results are combined with measurements of fluorescence anisotropy to obtai…
The synthesis of new di-Schiff bases with two non-mesogenic units and a flexible central spacer (‒CH2‒CH2‒) in their structure is reported. The mesomorphic properties of the compounds were investigated by differential scanning calorimetry (DSC) and polarizing microscopy. The Schiff bases derived from the aldehydes wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffuse reflectance infrared Fourier transform spectroscopic investigation of the decomposition of carbon-supported iron carbonyl clustersJeremy J. Venter and M. Albert VanniceCite this: J. Phys. Chem. 1989, 93, 10, 4158–4167Publication Date (Print):May 1, 1989Publication Hi…
Abstract The composition of epiphytic diatom communities from the cold tailwaters (12°C) of Glen Canyon Dam, Arizona, was analysed after a 2 wk incubation period at 12°C, 18°C and 21°C. There was a significant change in diatom composition between 12°C and 18°C, while no significant changes occurred between 18°C and 21…
A laboratory test method of ranking the ballistic performance of ceramic materials is under development at the U.S. Army Materials Technology Lab. by the Ballistic Impact Behavior Group and Armor Systems Team. Ranking are based on residual penetration of a tungsten long rod fired at constant velocity through a lateral…
The effects of air gaps on the high-frequency core loss in cut cores made of amorphous ribbons are discussed and methods to reduce the core loss in them are proposed. It has been found that the high-frequency core loss in amorphous cut cores with air gaps increases strikingly with increasing air-gap length. The increa…
The strength of the magnetostrictive material, Terfenol-D, Tb0.27Dy0.73Fe2.0, has been evaluated by measuring the modulus of rupture as a function of the Fe stoichiometry of the compound. It is shown that the strength improves markedly as the Fe concentration decreases from the stoichiometric value of 2.0 in the compo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical studies of cobalt-carbon bond formation. A kinetic investigation of the reaction between (tetraphenylporphinato)cobalt(I) and alkyl halidesG. B. Maiya, B. C. Han, and Karl M. KadishCite this: Langmuir 1989, 5, 3, 645–650Publication Date (Print):May 1, 1989Pub…
Two neighbouring grains of the same phase with a lattice of hexagonal Bravais type are considered which have a three-dimensional lattice of symmetry translations in common, called the coincidence site lattice or CSL. The volume ratio of unit cells for the CSL and the original lattice is called the multiplicity Σ. The…
The photostabilization of nifedipine by using film coating has been investigated in model systems in which a drug sample, dispersed on a glass plate, was covered with a free film and exposed to intensive light of mercury vapour lamp. The light transmission properties of films containing titanium dioxide or tartrazine…
Abstract Poly(vinyl chloride), PVC, is shown to be miscible with an α‐methyl styrene/acrylonitrile copolymer, αMSAN, containing 30 percent AN by weight using differential scanning calorimetry for blends prepared by several methods. Melt blending gave single T g mixtures; whereas, solution techniques gave results that…
The ability of zero-stress simulations, using Gordon-Kim pair potentials, to describe the structures and transformations of known fluoride-based perovskites is demonstrated for the case of ${\mathrm{KCaF}}_{3}$. When ${\mathrm{K}}^{+}$ is replaced by ${\mathrm{Na}}^{+}$ a new ferroelectric crystal isomorphous with ${\…
Summary A model heat-exchange apparatus was used to investigate the factors affecting deposit formation from milk on a stainless steel surface at 100 °C. The structure and composition of the deposits were determined by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and chemical analysis after solu…
We have studied the surface chemistry of iron pentacarbonyl by using thermal programmed desorption and x-ray photoelectron spectroscopy (XPS). Thermal desorption is mostly molecular and takes place in two stages. At low coverages a peak at 195 K was detected. For exposures above 4 L a second peak due to multilayer gro…
The stability of beta alumina in fully developed Zebra Na / FeCl 2 cells under long‐term cycling has been proven. In the early stages of development of the Na / FeCl 2 cell, some problems in the form of increased resistances were encountered under certain extreme conditions of temperature and voltage. While these diff…
Alkyl-substituted azobenzene-4-carboxylic acids are potent differentiation inducers of human promyelocytic leukemia cell line HL-60 to mature granulocytes. Their structure-activity relationships are very similar to those of other retinoidal benzoic acids which are generally represented by 4 and named retinobenzoic aci…
We present a new real-space renormalization-group (RSRG) scheme for finding exactly the local Green's functions (LGF) for electrons in a quasiperiodic Fibonacci chain. It has been possible to construct the RSRG transformation, which, apart from renormalizing the Fibonacci chain globally, also preserves the local envir…
New structural and calorimetric data for samples of NiAl 2 O 4 quenched from 600° to 1560°C are presented The spinel remains stoichiometric for all heat treatments. Based on the refinement of X‐ray powder patterns, it is shown that the degree of disorder, defined as the mole fraction of tetrahedral sites occupied by A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-temperature investigation of the ferrimagnetic chains MnM' (EDTA).cntdot.6H2O [M' = cobalt, nickel, and copper(II)]: thermal and magnetic propertiesE. Coronado, M. Drillon, P. R. Nugteren, L. J. De Jongh, D. Beltran, and R. GeorgesCite this: J. Am. Chem. Soc. 1989, 111,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSequence distribution in poly(dimethylsiloxane-co-methylvinylsiloxanes)Maris J. Ziemelis and John C. SaamCite this: Macromolecules 1989, 22, 5, 2111–2116Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 May 1989https://pubs…