Materials Literature
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Optical diffraction patterns are presented which illustrate the effect of multi-site correlations on the diffraction pattern of a model disordered alloy consisting of different sized atoms placed on a simple square lattice. Monte Carlo methods were used to apply size-effect distortions to a number of example lattices…
Thermomechanical properties of aluminum titanate‐mullite composites were studied for a wide composition range to develop material having high thermal shock resistance. The thermal shock resistance tended to increase with increasing aluminum titanate content. Composite having 82 vol% aluminum titanate can withstand wat…
We consider a model based on the Maier and Saupe theory in order to explain the reentrant nematic-isotropic transition observed in lyotropic liquid crystals. By assuming a linear dependence of the micellar shape anisotropy with temperature, we show that it is possible to obtain a reentrant transition.
In this work we study CaF2:Ce,Mn and use optical absorption, photoluminescence (excitation and emission), and x-ray-induced luminescence to characterize the role played by Ce in various lattice sites during these processes. The data indicate that energy transfer takes place from Ce to Mn, predominantly from Ce3+ in te…
Studies of the oxidation of Ni(111) in the temperature range 30–275°C by low energy electron diffraction (LEED), Auger electron spectroscopy (AES) and ellipsometry have shown that the epitaxy of the oxide is dependent on the growth temperature. Below 150°C the commonly reported hexagonal p(2×2)-O and NiO(111) patterns…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew polyheterocyclic 4n.pi.-electron dianions. Paratropicity, charge delocalization, and reactionsYoram. Cohen, Amatzya Y. Meyer, and Mordecai. RabinovitzCite this: J. Am. Chem. Soc. 1986, 108, 22, 7039–7044Publication Date (Print):October 1, 1986Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis of copper molybdatesAhmad Moini, Roberta Peascoe, Philip R. Rudolf, and Abraham ClearfieldCite this: Inorg. Chem. 1986, 25, 21, 3782–3785Publication Date (Print):October 1, 1986Publication History Published online1 May 2002Published inissue 1 October 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt(II) bis(1,4,7-trithiacyclononane): a low-spin octahedral complexG. S. Wilson, Dale D. Swanson, and R. S. GlassCite this: Inorg. Chem. 1986, 25, 21, 3827–3829Publication Date (Print):October 1, 1986Publication History Published online1 May 2002Published inissue 1 Octob…
Abstract The effect of impingement mixing on the microstructures developed during a reaction injection molding process in a thermoplastic urethane system was investigated. The polyurethane studied was a 4,4′‐diphenylmethane diisocyanate/l,4‐butane diol/poly(propyleneoxide) end‐capped with poly(ethy1eneoxide) polyol sy…
Electron back‐scattering Mössbauer complemented by x‐ray photoelectron spectroscopy (XPS) has been applied to study the nature of passive films on iron. Data indicate that iron in the films is present as Fe 3+ . While Mössbauer spectra of the films recorded at room and close to liquid helium temperatures more closely…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and dynamic behavior of the lithium enolate of acetaldehyde in solutionWenjing Quan and John B. GrutznerCite this: J. Org. Chem. 1986, 51, 22, 4220–4224Publication Date (Print):October 1, 1986Publication History Published online1 May 2002Published inissue 1 October…
Not alchemistry but rather chemistry is the basis for preparing a gold modification: [Au 55 (PPh 3 ) 12 Cl 6 ] can be degraded to naked Au 13 clusters in CH 2 Cl 2 solution by application of a 20‐V d.c. potential, the outer layer of the cluster being lost. These smaller clusters reorganize, in turn, the form superclus…
The dynamics of bulk molecular reorientation in ferroelectric liquid crystals (FLC's) are modeled by a continuum of elastically coupled, overdamped, massless ferroelectric dipoles under the influence of an external electric field. Numerical solution of this system's equation of motion in one dimension shows that reori…
Mesogenic chiral esters of 1-phenyl-1,2-ethandiol, 1-cyclohexyl-1,2-ethanediol, 1,2-diphenyl- 1,2-ethanediol, 1,1´-bi-2-naphthol, 1-phenylethanol, 1-phenyl-2,2,2-trifluorethanol and 1-(9- anthryl)-2,2,2-trifluorethanol were synthesized. The temperature dependence of the molecular twisting power was determined in the n…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase transitions in nematic liquid crystals: a mean-field theory of the isotropic, uniaxial, and biaxial phasesD. K. Remler and A. D. J. HaymetCite this: J. Phys. Chem. 1986, 90, 21, 5426–5430Publication Date (Print):October 1, 1986Publication History Published online1 May…
The present study examines the magnetic properties of four distinct magnetic systems. First, the range of amorphous Al-Mn films was extended down to 7.5 at. % Mn from the previous limit of 14 at. % obtained on both amorphous films and icosahedral ribbons, such films still exhibiting a local magnetic moment (\ensuremat…
The formula which relates the scaled interface width to the anisotropic interface tension is generalised for an arbitrary orientation of the interface in two dimensions. The relationship between the scaled interface width and the curvature of the equilibrium crystal shape is also generalised.
Abstract The rates of growth of polyethylene single crystals grown from dilute solution in hexadecane and tetradecanol have been measured over the temperature range T c = 98–120°C by following the change in turbidity during crystallization of a suspension of crystals of known shape and final size. The rates decrease s…
Abstract Low‐temperature relaxation behavior was investigated for a bisphenol‐A and three spiroring type epoxide resins cured with aromatic and spiro‐ring‐type diamines. A new well‐defined relaxation denoted here as the β′ relaxation was observed from 50 to 100°C for the spiro‐ring‐type resin systems in both mechanica…
A colloidal tracer system suitable for light scattering experiments has been prepared. The nonaqueous dispersion comprises host and tracer particles of 0.66 μm diameter in which the refractive index of the dispersion medium is adjusted to that of the host particles. Both the host polymer particles and the inorganic tr…