Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative Analysis of Brewster-Angle Microscope Images of Tilt Order in Langmuir Monolayer DomainsMei-Wei Tsao, Thomas M. Fischer, and Charles M. KnoblerCite this: Langmuir 1995, 11, 8, 3184–3188Publication Date (Print):August 1, 1995Publication History Published online1…
Five new pregnane glycosides, taiwanosides A [1], B [2], C [3], D [4], and E [5], together with wilfosides C1N [6], C2N [7], M1N [8], and K1N [9], were isolated from the roots of Cynanchum taiwanianum. Their structures were determined on the basis of spectroscopic and chemical evidence.
We present a complete map of the boundaries of stable plastic deformation characterized by critical stresses σ i (i = 1, 2, 3), for dilute f.c.c. CuMn polycrystals. Achieving this objective required systematic studies of tensile deformation curves as influenced by the following parameters: solute concentration (0.63 a…
Thermal behavior and morphology of blends prepared by solution casting of mixtures of chitosan and poly(ethylene oxide) were studied by means of differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The preliminary results indicate that both melting point and crystallinity depend on the compo…
Optical birefringence of the liquid crystal induced in its isotropic phase by low concentration polymer networks (1--4 % by weight) is used to estimate the internal surface area of the network and its order parameter. The results show conclusively that the polymer networks are finely distributed down to the nanometer…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
An ab initio molecular-dynamics simulation of liquid boron is presented. At the density \ensuremath{\rho}\ensuremath{\sim}2 g ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$ and the temperature T\ensuremath{\sim}2600 K, icosahedra are destroyed although atoms still form an open packing with sixfold coordination. Moreover,…
Abstract X‐ray photoelectron spectroscopy was used to compare several pretreatments of aluminium surfaces used in aerospace and aircraft industry. These anodizing processes, which aim at preparing the metal surface for adhesive bonding or painting, all lead to the formation of an aluminium oxide layer. A set of alumin…
The brazing of ZrO 2 ceramic to 1Cr18Ni9Ti stainless steel and to itself was performed using Ag 57 Cu 38 Ti 5 filler metal under a vacuum of 7 × 10 ‐3 Pa. The effects of interlayer copper on the ceramic to stainless steel joint strength, and the brazing temperature (1073 to 1323 K) and holding time (0 to 60 min) on ce…
The orientation-phase-space-averaged excess volume associated with grain boundaries in nanocrystalline Pd has been deduced from a rule-of-mixtures analysis of density and thermal expansion coefficient measurements. The atomic density is found to fluctuate along the grain-boundary core with an amplitude that could be r…
Preferred equilibrium structures of a smectic-A phase grown from an isotropic phase have been investigated theoretically and experimentally. The surface-integral equation reported in our recent paper [H. Naito, M. Okuda, and Z. Ou-Yang, Phys. Rev. Lett. 70, 2912 (1993)] and a surface-differential equation are derived…
The gene encoding the F420-dependent N5,N10-methylenetetrahydromethanopterin reductase (Mer), which catalyzes an intermediate step in methanogensis, was cloned and sequenced from the thermophilic Methanobacterium thermoautotrophicum strain Marburg. The gene was identified on a 3.8-kbp BamHI fragment of M. thermoautotr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Decomposition of Energetic Materials. 68. Decomposition and Sublimation Kinetics of NTO and Evaluation of Prior Kinetic DataG. K. Williams and T. B. BrillCite this: J. Phys. Chem. 1995, 99, 33, 12536–12539Publication Date (Print):August 1, 1995Publication History Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvaluation of the Redox Potential of Ag1I(CN)2-/Ag10(CN)22- in Aqueous SolutionS. Remita, P. Archirel, and M. MostafaviCite this: J. Phys. Chem. 1995, 99, 35, 13198–13202Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inissue 1…
We have investigated the binding of mutant forms of glucoamylase from Aspergillus niger to the inhibitors 1-deoxynojirimycin and acarbose. The mutants studied comprise a group of single amino acid replacements in conserved regions near the active site of the enzyme. For each mutant we have determined both the affiniti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of Amorphous Starch. 1. An Atomistic Model and X-ray Scattering StudyU. Trommsdorff and I. TomkaCite this: Macromolecules 1995, 28, 18, 6128–6137Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inissue 1 August 1995http…
We have used contactless photoconductance decay measurements to monitor cleaning processes, surface contamination, and surface roughness. Changes in surface chemistry are evidenced by a degradation (increase) in the surface recombination velocity (decrease in measured decay time). We have applied the tool to monitor c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Mechanism of the Sodium Cation Complexation by 5,11,17,23-Tetra-p-tert-butyl-25,26,27,28-tetramethoxycalix[4]arene in SolutionJohan Blixt and Christian DetellierCite this: J. Am. Chem. Soc. 1995, 117, 33, 8536–8540Publication Date (Print):August 1, 1995Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Cyclic Voltammetric and Electrospray Mass Spectrometric Studies of a Series of Tris-Substituted 1,2-Dithiolene Complexes of Tungsten and MolybdenumPolycarpos Falaras, Christine-Anne Mitsopoulou, Dimitris Argyropoulos, Emmanuel Lyris, Nikos Psaroudakis, Ersi Vrachn…
Optical properties of a soluble conducting polymer, perfluoroalkylated poly(diphenylacetylene) (PFPDPA) were clarified. The band-gap energy was evaluated to be about 2.7 eV. Relatively strong fluorescence was observed in PFPDPA, while poly(diphenylacetylene) (PDPA) is considered to be a conducting polymer with a degen…