Materials Literature
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The authors discuss the modeling and fabricating miniature, vacuum, field-emission diodes and triodes for use in electronics in hazardous environments. They are micrometer-sized devices that are fabricated on a semiconductor wafer using integrated-circuit fabrication techniques and that use field emission rather than…
Attenuated total reflectance Fouriertransform infrared (ATR‐FTIR) spectra were measured in the region from 4300 to 400 cm −1 for a hydrated Na 2 O–SiO 2 glass containing 35 wt% water. The Si–OH bending vibration mode was observed. It was found that the incorporated water, molecular water as well as hydroxyls, affected…
The metabolic pathways of poly(3-hydroxybutyrate) (PHB) and polyphosphate in the microorganism Alcaligenes eutrophus H16 were studied by H, C, and P nuclear magnetic resonance (NMR) spectroscopy and by conventional analytical techniques. A. eutrophus cells accumulated two storage polymers of PHB and polyphosphate in t…
As‐received, yttria‐doped (4.2 wt% Y 2 O 3 ) single crystals of zirconia were heated to ≥2100°C in air. Cube‐shaped samples with faces perpendicular to 〈100〉 axes on the basis of the pseudocubic symmetry were cut from the crystals. X‐ray and electron diffraction indicated that the crystals are polydomain with [001] ax…
The shrinkage rates of small prismatic dislocation loops in thin foils of sapphire (α‐Al 2 O 3 ) have been determined using transmission electron microscopy; between observations the thin foils were annealed ex situ in the temperature range 1200° < T < 1500°C. The shrinkage rates of individual loops were used to…
We report on three compound magnetic and electrostatic lenses for low-voltage applications: an immersion condenser lens, a compound spectrometer objective lens for electron beam testing, and an objective lens for a low-voltage scanning electron microscope (SEM). A common characteristic of all lenses is the electrostat…
Preliminary investigations of the microstructure/mechanical properties relationship in a mollusk shell—the large conch, Strombus gigas —are reported. Strombus gigas has the well‐ordered “crossed lamellar” microstructure and, in four‐point bending, is remarkably tough in certain orientations, permitting noncatastrophic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the high-temperature spin-state crossover in the iron(II) pyrazolylborate complex Fe[HB(pz)3]2Fernande Grandjean, Gary J. Long, Bennett B. Hutchinson, LaNelle Ohlhausen, Paul Neill, and J. David HolcombCite this: Inorg. Chem. 1989, 28, 24, 4406–4414Publication Date…
Pseudomonas putida PpGl, which carries the CAM plasmid encoding enzymes involved in the degradation pathway of D-camphor, can utilize D-camphor as a sole carbon source. Cytochrome P-450cam and related enzymes participate in the early oxidation steps of D-camphor degradation metabolism. We cloned from a HindIII DNA lib…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of dynamic photoluminescence spectroscopy to the study of the active surface sites on supported molybdenum/silica catalysts: features of anchored and impregnated catalystsMasakazu Anpo, Masao Kondo, Catherine Louis, Michel Che, and Salvatore ColucciaCite this: J.…
A new and simple substrate for inducing surface-enhanced Raman scattering (SERS) was investigated. This new SERS substrate consists of a solid support, such as a microscope slide, coated with alumina and then covered with silver. The alumina used in this work is an agglomerate-free type available in several submicron…
A highly specific and powerful magnetic resonance imaging contrast agent has been prepared by coating magnetite (Fe3O4) particles with monoclonal antibodies directed against a tumor antigen. The preparation maintains both the immunoreactivity of the monoclonal antibody and the full relaxing capability of the magnetite…
A series of copolymers of glycine and DL-lactic acid with various compositions was synthesized and their in vivo and in vitro degradation behavior was studied. For the in vivo examination, discs of the copolymer films were subcutaneously implanted in rats. The in vitro studies were carried out in phosphate buffer at p…
Thermodynamic calculations were performed on the Si‐N‐O system, and the results are discussed in relation to the thermal oxidation of crystalline Si 3 N 4 . Based on our previous oxidation results at temperatures in the range of 1200°–1400°C and oxygen partial pressures of 0.05–1.0 atm in oxygen‐argon or oxygen‐nitrog…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSquare-planar complexes of platinum(II) that luminesce in fluid solutionJuan A. Zuleta, Carlos A. Chesta, and Richard EisenbergCite this: J. Am. Chem. Soc. 1989, 111, 24, 8916–8917Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Publishe…
We propose a gradient-dependent flow theory of plasticity for metals and granular soils and apply it to the problems of shear banding and liquefaction. We incorporate higher order strain gradients either into the constitutive equation for the flow stress or into the dilantancy condition. We examine the effect of these…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymorphic structures and molecular vibrations of syndiotactic polystyreneMasamichi Kobayashi, Takahiko Nakaoki, and Nobuhide IshiharaCite this: Macromolecules 1989, 22, 11, 4377–4382Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Publ…
Oxidation of [RuII(OEP)(CO)] [H2OEP = octaethylporphyrin] by m-chloroperoxybenzoic acid in methanol gave [RuVI(OEP)(O)2], isolated as air-stable diamagnetic purple solid (μeff ∼ 0 μB). [RuVI(OEP)(O)2] shows one intense IR band at 821 cm-1 assignable to vas(O=Ru=O) stretch. In CH2Cl2, it reacts with olefins to give epo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA polyelectrolyte brush theorySanjay Misra, Sasidhar Varanasi, and P. P. VaranasiCite this: Macromolecules 1989, 22, 11, 4173–4179Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 November 1989https://pubs.acs.org/doi/…
BaTiO 3 thin films have been prepared in situ on Ti metal substrates by a hydrothermal electrochemical technique, where a direct current has been passed between the anode, Ti plate, and the cathode, Pt plate, in high-temperature, high-pressure Ba 2+ solutions. Dense thin films, 0.1∼0.3 µm thick, which consist of cubic…