Materials Literature
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The crystallization behaviour of amorphous Ge (a-Ge) in a-Ge/Ag/a-Ge trilayer and a-Ge/Ag multilayer systems has been investigated using in situ transmission electron microscopy (TEM) and differential scanning calorimetry. The crystallization temperature of a-Ge in these systems is 240–270°C, about 250°C lower than th…
Abstract A method for the construction of carbon paste electrodes (CPE) is described. Here ferrocene is used as the insoluble electroactive species, graphite powder as conductor and sulfuric acid as binder. The CPE thus prepared prevents ferrocenium ions from diffusing towards the bulk solutions. Voltammetric, chronop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2D-INADEQUATE NMR Evidence for the Termination Mechanism of Styrene Free-Radical PolymerizationDarlene R. Hensley, Stephen D. Goodrich, April Y. Huckstep, H. James Harwood, and Peter L. RinaldiCite this: Macromolecules 1995, 28, 5, 1586–1591Publication Date (Print):February…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesorption Kinetics and Adlayer Sticking Model of n-Butane, n-Hexane, and n-Octane on Al2O3(0001)R. M. Slayton, C. M. Aubuchon, T. L. Camis, A. R. Noble, and N. J. TroCite this: J. Phys. Chem. 1995, 99, 7, 2151–2154Publication Date (Print):February 1, 1995Publication History…
An anomalous stacking fault is reported that is observed within deformation twins in Ti and Zr. Their formation may be restricted to situations where deformation twinning takes place. An understanding of this process sheds new light on the twinning process. In this work the crystal structure of the stacking fault and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes of New Electrochemically-Active p-Quinonyl-/p-hydroquinonylphosphines: Multiple Electron/Proton Transfer Reactions and Electrochemical/pH Control of p-Quinonyl-/p-Hydroquinonyl o-Oxygen Atom CoordinationSeri Bima Sembiring, Stephen B. Colbran, and Donald. C. CraigC…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Class of Photo-Cross-Linkable Side Chain Liquid Crystalline Polymers Containing Bis(benzylidene)cyclohexanone UnitsGangadhara and Kaushal KishoreCite this: Macromolecules 1995, 28, 4, 806–815Publication Date (Print):February 1, 1995Publication History Published online1…
<div class="htmlview paragraph">Increasingly stringent emissions controls have led to a greater emphasis on strategies designed to minimize emission during cold start. One strategy employed is that of close-coupling the catalyst to the exhaust manifold of the engine in an effort to minimize catalyst light-off ti…
Monoclinic tau(2)-Al13Co4, tau(3)-Al13Co4 and tau(4)-Al13Co4 phases with a and c parameters about tau(2), tau(3) and tau(4) times [tau = (1 + 5(1/2))/2 = 1.61803, which is the golden number], respectively, greater than their counterparts in Al13Co4 (space group Cm, a = 1.5183, b = 0.8122, c = 1.2340 nm, beta = 107 deg…
Porous silicon formed by anodization of a p‐type silicon substrate is characterized by a distribution of crystallites with diameters smaller than about 100 Å. The corresponding size distributions obtained from Raman measurements show distinct peaks which are explained for the first time by the tunneling of holes throu…
Specimens of the 350 K (77°C) ternary eutectic of the Bi–In–Sn system were solidified unidirectionally at very low speeds and quenched to form a representative solid/liquid interface for subsequent study. From such interfaces, this eutectic was observed to be of the faceted–faceted–non-faceted type, freezing to form t…
Transmission electron microscopy investigations have been performed on SrxBa1-xNb2O6 (SBN x(1 - x)). Bright-field imaging of ⟨100⟩-oriented SBN 60/40 and 75/25 crystals revealed nanopolar domains with a strong shape anisotropy. The morphology of the nanopolar domains was needle like. Selected area electron diffraction…
Layered ceramic‐ceramic composites exhibit improved mechancial performance over monolithic composites, design flexibility for the solution of complex technological problems such as with functionally gradient materials (e.g. Al 2 O 3 /Y‐TZP, see Figure), and provide a model for the sudy of interfacial reactions between…
Abstract The monolith froth reactor, involving two‐phase flow and a monolith catalyst, is developed. The flow within monolith channels, consisting of trains of gas bubbles and liquid slugs, is produced by forming a two‐phase froth in a chamber immediately below the bottom of the monolith. The froth then flows upward i…
Abstract 2,6,6-Trimethyl-5-(2,5-dimethyl-3-furyl and -3-thienyl)-3-heptyn-2,5-diols were carbonylated in benzene in the presence of 1 : 1 — Pd(OAc)2/I2 as the catalyst. The reaction at 90 °C under 80 atm of carbon monoxide for 5 h directly gave both E and Z isomers of t-butyl-substituted furyl- or thienyl fulgides. Th…
The nuclear enzyme topoisomerase I (topo I) has been recently recognized as the target for the anticancer drug camptothecin (CPT; NSC 94600) and its derivatives. This drug has been reported to display effective antitumor effects on a variety of human tumor models xenografted in nude mice. However clinical studies of s…
It is well known that the highest elastic moduli reported for linear poly-mers are generally much smaller than their theoretical values. This has been shown particularly by Nakamae and coworkers [1]. For a range of poly-mers they have summarized their crystal moduli determined by x-ray dif-fraction as measured in the…
The SpectroMicroscopy Facility at the Advanced Light Source is based on a high brightness, high-resolution beamline, and includes a collection of projects designed to exploit the unique characteristics of the soft x-ray beam. The beamline itself is comprised of a 5-m long, 5-cm-period undulator, a spherical-grating mo…
Changes in appearance and in the chemical and mechanical properties of films of Liquitex acrylic gloss medium, a commercial artists' medium based on an acrylic polymer dispersion, have been studied during natural aging in the dark and in accelerated thermal and light exposure tests. In dark storage at room temperature…
Abstract Samples of poly(etherether ketone) (PEEK) were subjected to large plastic deformations under uniaxial tension and simple shear by means of a new video‐controlled testing method at constant true strain rate. The “equivalent” stress‐strain curves obtained under the two loading modes are close at the yield point…