Materials Literature
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Abstract New organic/inorganic hybrid polymers, 2 : 1 type 3-(methacryloxy)propyl magnesium phyllosilicate and 2 : 1 type 3-(methacryloxy)propyl nickel phyllosilicate, were synthesized at room temperature by the copolymerization reaction of [3-(methacryloxy)propyl]trimethoxysilane to metal chloride hexahydrate. These…
Throughout the microstructure at every varistor, there exist variations of the grain size and the electrical properties of the individual grain boundaries. To calculate the effect of such microstructural variations on the overall electrical transport properties, we describe a multibond percolation approach utilizing e…
The gene coding for riboflavin synthase of Escherichia coli has been cloned by marker rescue on a 6-kb fragment that has been sequenced. The riboflavin synthase gene is identical to the ribC locus and codes for a protein of 213 amino acids with a mass of 23.4 kDa. It was mapped to a position at 37.5 min on the physica…
The relationship between surface sediment diatom assemblages and measured limnological variables in 33 coastal Antarctic lakes was examined by constructing a diatom-water chemistry dataset. Canonical correspondence analysis revealed that salinity and silicate each explain significant amounts of variation in the distri…
Article The Effect of Silica and Phosphate on the Transformation of Schoepite to Becquerelite and Other Uranyl Phases was published on December 1, 1996 in the journal Radiochimica Acta (volume 74, issue s1).
The structure of 5,10,15,20-tetraphenylporphinatonickel(II) ([Ni( tpp )]) has been studied by both X-ray diffraction (powder and single-crystal methods) and EXAFS. The bond lengths obtained from analysis of the EXAFS agree, within standard deviations, with those obtained from the X-ray diffraction studies. The Ni-N bo…
The thermomechanical properties of the shape memory effect and superelasticity due to the martensitic transformation and the R-phase transformation of a TiNi shape memory alloy were investigated experimentally. The transformation line, recovery stress and fatigue property due to both transformations were discussed for…
Small amounts of Li 2 O result in sintering in the AIN‐Y 2 O 3 ‐CaO and AIN‐CaO systems at firing temperatures <1600°C. The effect is ascribed to reduction of the liquidus temperature. Furthermore, Li 2 O is removed by volatization at temperatures from 1300° to 1600°C, and its content decreases several ppm from the…
Small cylindrical tubes were sintered in a microwave‐ induced oxygen plasma, initiated and sustained inside a tunable, single‐mode cavity. Temperature and shrinkage measurements of the specimens were achieved using an optical‐fiber thermometer black‐body sensor and a dilatometer, respectively. Sintering experiments at…
We present a simple treatment of the depletion-driven demixing transition in isotropic and perfectly aligned binary hard-rod mixtures. The simplicity is mainly due to the fact that we use the second virial approximation to the Helmholtz free energy in combination with a convenient Legendre transform. This combination…
The corrosion behavior of nitrogen ion (N2+)-implanted AZ91D magnesium alloy (UNS M11916) in 5 wt% sodium chloride (NaCl) solution was investigated using weight-loss measurement and electrochemical techniques. Ion implantation improved corrosion resistance at doses &gt; 1 x 1016 ions/cm2 (6.5 x 1016 ions/in.2). At…
An equilibrium domain theory is used to calculate the thickness and temperature dependencies of relative domain populations in tetragonal ferroelectric thin films epitaxially grown on cubic substrates. The relative coherency strain between the film and substrate that governs domain configurations is evaluated with the…
Abstract Scale formation of calcium carbonate on tube walls is studied in a once‐through flow system under isothermal conditions. The effects of supersaturation ratio, flow velocity and liquid temperature on the deposition rates are investigated. For relatively small supersaturation ratios (in the range 3.5 to 8) the…
An off-lattice pseudocontinuous model for semiflexible polymerlike micelles with excluded volume interactions is presented. Expansion factors are determined for the radius of gyration squared and for three different characteristic point-point distances squared. They are found to scale with an exponent in agreement wit…
The electrochemical behavior of chemically vapor deposited tungsten films in solutions of interest to tungsten chemical mechanical polishing has been investigated using dc potentiodynamic polarization, linear polarization, and Tafel methods. It was found that in the absence of an oxidizer, the tungsten surface was pas…
The recent novel temperature modulated differential scanning calorimetry (MDSCTM TA Instruments Inc. USA) technique has been applied to the measurement of the thermal properties of chalcogenide glasses of the As-Se system in the glass transition region. All samples in this work were given the same thermal history by h…
Supramolecular wires and channels are one‐dimensional molecular materials capable of transporting charge, etc. in a predefined direction. Examples are given of wires and channels that have been formed by self‐assembly in the liquid‐crystalline state or in solution, for example from alkoxy‐substituted triphenylenes (se…
Abstract cis- and trans-bis(1-methyl-2-imidazolyl)tetraethyltetramethylporphyrin Mg complexes were prepared. 1H NMR, absorption, and fluorescence spectra suggest that Mg has a high tendency toward dimer formation through coordination from imidazolyl to metal in a similar way to Zn, and accepts further the sixth coordi…
Abstract We describe the synthesis of micro‐phase‐segregated block‐copolyesterurethanes from telechelic hydroxyterminated poly{[( R )‐3‐hydroxybutyric acid]‐ co ‐[( R )‐3‐hydroxyvaleric acid]} (PHB‐diol) as “hard segments” (i. e., crystallizable chain sections) and hydroxyterminated poly(ε‐caprolactone)‐diethylene gly…
To further investigate the ways in which proteins respond to changes in the length of the polypeptide chain, a series of 32 insertions and five deletions were made within nine different alpha-helices of T4 lysozyme. In most cases, the inserted amino acid was a single alanine, although in some instances up to four resi…