Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable photon energy photoelectron spectroscopy on FeCl4-. An unusual electronic structure for high-spin d5 complexesKristine D. Butcher, Stephen V. Didziulis, Bernard Briat, and Edward I. SolomonCite this: J. Am. Chem. Soc. 1990, 112, 6, 2231–2242Publication Date (Print):…
Fracture resistance behavior was characterized for SiC‐whisker‐reinforced alumina composites with porosities ranging from 0.6% to 11.5% The composites were hot‐pressed from an Al 2 O 3 powder with 25 wt% SiC whiskers. Strengths of individual specimens were measured in four‐point flexure either for natural flaws or for…
Poly(methyl methacrylate) (PMMA) was chosen as a model lithographic material to study the effect of A1 Kα radiation and the thermal (flood gun) electron flux on polymer surface. The main chemical changes, which can occur in polymers by radiation, are (1) main-chain scission, (2) cross linking, and (3) volatile product…
We show that the optimum structure of polyisothianaphthene strongly depends on the chain length. Short oligomers have an aromatic structure, while chains consisting of more than 9 monomers exhibit an aromatic to quinoidal transition along the chain.
Using calorimetry and scanning electron microscopy, we have investigated the formation process and phase behavior of a polyurethane-based polymer-dispersed liquid crystal system. We have measured the kinetics and energetics of the cure process during which liquid crystal microdroplets form by phase separation from the…
Abstract Clay dispersion in southeastern USA soils needs to be better characterized, because dispersion influences crusting, infiltration, and erosion of field soils. In order to study dispersion of highly weathered soils, clays separated from Ap and Bt horizons of three soil series from the Georgia Piedmont were equi…
Osteochondral defects in the distal femoral condyles of rabbits exposed to a pulsing direct current exhibits an enhanced quality of repair. The signal, with a peak value of 2 microA repeating at 100 Hz, imposed an electric field in the tissue of 20-60 mV/cm2. Maximum efficacy was seen with a shorter period of exposure…
Methods which consider the effect of grain orientation and work hardening on short-fatigue-crack growth are examined. Fatigue cracks are assumed to form in the most favourably oriented grains on the surface of the specimen and propagate through less well oriented grains. A method of deriving the sequence of orientatio…
The sintering of spherical borosilicate glass powder (particle size 5 to 10 μm) under a uniaxial stress was studied at 800°C. The experiments allowed the measurement of the kinetics of densification and creep, the viscosities for creep and bulk deformation, and the sintering stress which was found to increase with den…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation and x-ray structure of a dinuclear copper-nitrosyl complexPartha P. Paul, Zoltan Tyeklar, Amjad Farooq, Kenneth D. Karlin, Shuncheng Liu, and Jon ZubietaCite this: J. Am. Chem. Soc. 1990, 112, 6, 2430–2432Publication Date (Print):March 1, 1990Publication History Pu…
Laser-annealed and further thermally annealed arsenic implanted silicon specimens have been investigated in a range of doses from 1×1016 to 5×1016 As/cm2, with different experimental techniques: electrical measurements, transmission electron microscopy (TEM), double-crystal x-ray diffractometry (DCD), and extended x-r…
A bistable spatial light modulator is developed by utilizing optical bistability of ferroelectric liquid-crystal molecule.Both positive and negative images are read out by changing the polarity of applied electric pulses. A binary image is stored for more than 2 h, and gray-level operation is also possible during the…
Electron and phonon spectra, densities and integrated densities of states, and dynamic-response functions are investigated for a variety of two-dimensional (2D) quasicrystals. The dynamical properties of a Fibonacci chain, extended both periodically and quasiperiodically into a second dimension, are obtained using an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew low-dimensional zinc compounds containing zinc-oxygen-phosphorus frameworks: two-layered inorganic phosphites and a polymeric organic phosphinateMinghuey Shieh, Kevin J. Martin, Philip J. Squattrito, and Abraham ClearfieldCite this: Inorg. Chem. 1990, 29, 5, 958–963Publi…
Tables are given of all coincidence orientations with multiplicity Σ ≤ 36 for rhombohedral lattices with axial ratios in the range of corundum type structures (2.696 < c/a < 2-765). Measurements of the relative orientation of 133 pairs of neighbouring grains in sintered a-alumina showed that near-coincidence boundarie…
We present the design and characterization of a spatial light modulator (SLM) comprising a ferroelectric-liquid-crystal light-modulating layer on top of a silicon integrated circuit. Our SLM consists of two electrically addressed arrays on the same integrated-circuit die. The first, a 1 x 128 linear array with a 20-mi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural control of conjugation in functionalized polythiophenesJean Roncali, Pascal Marque, Robert Garreau, Francis Garnier, and Marc LemaireCite this: Macromolecules 1990, 23, 5, 1347–1352Publication Date (Print):March 1, 1990Publication History Published online1 May 200…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular orientation in LB films of azobenzene-containing long-chain fatty acids and their barium salts studied by FT-IR transmission and reflection-absorption spectroscopyTakeshi Kawai, Junzo Umemura, and Tohru TakenakaCite this: Langmuir 1990, 6, 3, 672–676Publication Dat…
Abstract A series of poly(ether/ester)s 1 based on poly(butylene terephthalate) Systematic IUPAC nomenclature: poly(oxytetramethyleneoxyterephthaloyl). and poly(ethylene glycol) is synthesized. 1 H and 13 C nuclear magnetic resonance, infrared and differential scanning calorimetry (DSC) measurements prove a block stru…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProbe diffusion in polyacrylamide gels as observed by means of holographic relaxation methods: search for a universal equationIl Hyun Park, Charles S. Johnson Jr., and Don A. GabrielCite this: Macromolecules 1990, 23, 5, 1548–1553Publication Date (Print):March 1, 1990Publica…