Materials Literature
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Zinc silicates are important in CRTs and lamp phosphors. Previous work has shown that a sol‐gel‐like method (termed CGUPS) can produce uniform zinc silicate phosphor particles whose surface layer possesses an appropriate activator concentration gradient and exhibits efficient cathodoluminescence (CL). This work furthe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteric influence of the trimethylsilyl group in organic reactionsJih Ru Hwu and Naelong WangCite this: Chem. Rev. 1989, 89, 7, 1599–1615Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 November 1989https://pubs.acs.or…
Crystals suitable for X-ray diffraction studies at moderate resolution have been grown from two forms of human chorionic gonadotropin (hCG): HF-treated hCG and neuraminidase-treated hCG. The enzymatically desialylated form of hCG produced crystals that diffract to 2.8 A as compared to the HF-treated hCG crystals that…
Copper(II) pyruvaldehyde bis(N4-methylthiosemicarbazone) ([Cu]PTSM) has shown potential as a flow tracer and can be labeled with the generator-produced positron emitting radionuclide 62Cu as well as with other copper radioisotopes. To define the myocardial handling of [Cu]PTSM, the externally detected single pass extr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical disorder in non-oxide chalcogenide glasses. Site speciation in the system phosphorus-selenium by magic angle spinning NMR at very high spinning speedsDavid Lathrop and Hellmut EckertCite this: J. Phys. Chem. 1989, 93, 23, 7895–7902Publication Date (Print):November 1…
The present work includes twelve invited review papers with comprehensive descriptions of the challenges in six topical areas: analytical fracture mechanics, nonlinear and time-dependent fracture mechanics, microstructure and micromechanical modeling, fatigue crack propagation, environmentally assisted cracking, and f…
Focused ion beam induced deposition of metals has up to now produced films with resistivities 30–5000 times higher than bulk values for metals because of high concentrations of impurities from the precursor gas incorporated into the films. We have demonstrated for the first time deposition of submicron Au films with r…
A chemical potential diagram for A‐B‐O (A, B = metallic elements) systems has been constructed to make visually clear the thermodynamic stability of double oxides; the stability area of metallic elements, their binary oxides, and double oxides can be presented as convex polygons in a log ( a A / a B ) vs log P (O 2 )…
The purpose of this study was to develop a new casting machine for titanium and Ni-Ti alloys. Properties of cast pure titanium and Ni-Ti alloys were studied by means of the tensile and casting tests. As gas in the mold was removed by the mold being heated under a high vacuum, the reaction between the molten metal and…
The electromagnetic field generated in a nonabsorbing anisotropic multilayer by a plane incident wave with given wave vector is considered. By taking into account the fact that the field within a given layer is a superposition of four proper waves, namely, four waves that propagate without changing their polarization…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly[(aryloxy)phosphazenes] with phenylphenoxy and related bulky side groups: synthesis, thermal transition behavior, and optical propertiesHarry R. Allcock, Michael N. Mang, Alexa A. Dembek, and Kenneth J. WynneCite this: Macromolecules 1989, 22, 11, 4179–4190Publication Da…
How does a light/current switch function at the molecular level? The title compounds could contribute to a deeper understanding. Visible light transforms 1 into 2. Both 1 as well as 2 are electron-transfer active. Since 2 is reduced electrochemically far more readily than 1, photochemically modulated current pulses ar…
The formation of hydroxyl (OH) and the subsequent production of water in the reaction of hydrogen gas with adsorbed atomic oxygen on Pt(111) at low temperatures (130⩽T⩽165 K) and pressures (2×10−10⩽PH2⩽1×10−9 Torr) have been studied using time-resolved electron energy loss spectroscopy (TREELS). The time evolution of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethane oxidation over Pt on .gamma.-alumina: kinetics and structure sensitivityK. OttoCite this: Langmuir 1989, 5, 6, 1364–1369Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 November 1989https://pubs.acs.org/doi/10…
Abstract A series of 9 new chiral and crosslinkable liquid‐crystalline copolymers were synthesized and transformed into liquid‐crystalline elastomers by crosslinking using a hydrosilylation reaction. Both the soluble copolymers and the elastomers show cholesteric, smectic A and chiral smectic C * phases, which are not…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual structural distortions induced by charge-transfer interactions through conjugated molecules: crystal structures of NH2(C6H4)(C.tplbond.C)n(C6H4)NO2 (n = 0-3)Eva M. Graham, Vincent M. Miskowski, Joseph W. Perry, Daniel R. Coulter, A. E. Stiegman, William P. Schaefer,…
The adsorption of NO on Ag(111) at 80 K has been studied by high resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). At low exposures (≤0.05 L) NO is adsorbed in part dissociatively and in part molecularly in two different threefold bridge states (in upright and bent or til…
Abstract In the mathematical formalism of quantitative AES and XPS, the elastic electron collisions are not taken into account. However, recent calculations have shown that the neglect of the elastic collisions may result in considerable errors. Theoretical analysis of the actual electron transport in a solid requires…
An electron beam (e-beam) measurement and inspection technique for x-ray masks using a conductive organic layer has been developed. This technique consists of spin coating of a conductive organic layer, scanning e-beam probe, detecting the backscattered and secondary electron signals, and removing the conductive layer…
Abstract The photoinduced and thermal cis/trans isomerization of the title compound adsorbed on silica gel has been studied by the immersion method. The cis/trans photoisomerization of the adsorbed state can be reversibly induced by irradiation. Thermal isomerization of the cis-to trans-isomer proceeds very fast on th…