Materials Literature
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The tip of a scanning tunneling microscope (STM) was used to inject electrons into thin Pt layers of metal–oxide–semiconductor (MOS) structures. The collector currents emanating from the n-type Si(100) substrates were measured as a function of the electron energy, determined by the STM tip bias VT, for different oxide…
We have performed a molecular dynamics computer simulation study to investigate the dynamical behavior of a supercooled simple liquid for comparison with the predictions of mode-coupling theory (MCT). By scaling the intermediate scattering function by the α-relaxation time r we find that the correlators fall onto a ma…
Reusable, oxidation-protected reinforced carbon-carbon has been successfully flown on all Shuttle Orbiter flights. Thermal testing of the silicon carbide-coated, reinforced carbon-carbon to determine its oxidation characteristics has been performed in convective (plasma Arc-Jet) heating facilities. Surface sealant mas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Electronic Structure of Substituted Aromatic Dithiolene Complexes of Gold(III)N. C. Schiodt, P. Sommer-Larsen, T. Bjornholm, M. Folmer Nielsen, J. Larsen, and K. BechgaardCite this: Inorg. Chem. 1995, 34, 14, 3688–3694Publication Date (Print):July 1, 1995Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron Spin Resonance and Electron Spin Echo Modulation Study of Ni(I) in Silicoaluminophosphate Type 5: Adsorbate Interactions and Evidence for the Framework Incorporation of Ni(I)Martin Hartmann, Naoto Azuma, and Larry KevanCite this: J. Phys. Chem. 1995, 99, 27, 10988–1…
Abstract Propane was catalytically oxidized to acrylic acid and acetic acid with molecular oxygen at 360 °C over heteropolymolybdophosphoric acids which were treated with pyridine in the catalyst preparation. Under presently optimized reaction conditions 24% selectivity to acrylic acid and 15% to acetic acid were achi…
Proclavaminate amidino hydrolase (PAH) catalyzes the reaction of guanidinoproclavaminic acid to proclavaminic acid and urea, a central step in the biosynthesis of the beta-lactamase inhibitor clavulanic acid. The gene encoding this enzyme (pah) was tentatively identified within the clavulanic acid biosynthetic cluster…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHitherto Ignored Effects of Chain Length on the Flory-Huggins Interaction Parameters in Concentrated Polymer SolutionsHans-Michael Petri, Norbert Schuld, and B. A. WolfCite this: Macromolecules 1995, 28, 14, 4975–4980Publication Date (Print):July 1, 1995Publication History P…
The CaO—Al 2 O 3 — CaSO 4 —CaCO 3 -H 2 O closed system at 25°C has been investigated by thennodynamic calculations: eight isothermally invariant points have been determined. From these points, the composition of the solutions coexisting at equilibrium with ettringite, calcium hemicarboaluminate and/or calcium monocarb…
Dielectric spectroscopy and calorimetry studies of a low viscosity, initially monomeric liquid undergoing spontaneous chemical reaction, to form a linear chain polymer while maintaining isothermal conditions, have been used to determine how the number of covalent bonds formed during the growth of a linear chain affect…
Insulation design against insulator contamination has been made so far by using the traditional deterministic method. In this method, the maximum contamination severity is first assumed. Then, a certain margin is counted between the withstand voltage obtained from actual tests and the target operating voltage. However…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyisobutylene-Based Thermoplastic Elastomers. 3. Synthesis, Characterization, and Properties of Poly(.alpha.-methylstyrene-b-isobutylene-b-.alpha.-methylstyrene) Triblock CopolymersDawei Li and Rudolf FaustCite this: Macromolecules 1995, 28, 14, 4893–4898Publication Date (…
Upon illumination some structural defects in irradiated silicon can be excited into the metastable triplet S=1 states. These triplet states can be involved in the excess-carriers recombination process. This paper provides a theoretical treatment of spin-dependent recombination (SDR) via an excited triplet state and re…
Spectroscopic ellipsometry was utilized to follow in situ the annealing of sol‐gel Pb(Zr,Ti)O 3 films on sapphire and platinum‐coated silicon substrates. Low‐temperature processes, such as pyrolysis of organics and film densification, could be identified readily. Crystallization of the perovskite phase was initiated b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleCharacterization and Photoprotection Studies of a Model .gamma.-Cyclodextrin-Included Photolabile Drug Entrapped in Liposomes Incorporating Light AbsorbersYannis L. Loukas, Pramukh Jayasekera, and Gregory GregoriadisCite this: J. Phys. Chem. 1995, 99, 27, 11035–11040Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium and Saturation Coverage Studies of Alkyl and Aryl Isocyanides on Powdered GoldKuo-Chen Shih and Robert J. AngeliciCite this: Langmuir 1995, 11, 7, 2539–2546Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July…
Neutron diffraction data have been collected for hexamethylenetetramine (HMT) at 15, 50, 80, 120, 160 and 200K using a single crystal (mass 8.1 mg). The structure refinement at each temperature included two extinction parameters and third-order thermal parameters for the H nuclei. Extinction effects are very severe wi…
The effect of rubbing on the polyimide (PI) Langmuir-Blodgett (LB) surface-alignment films has been successfully evaluated by observing the temperature dependence of the polar anchoring strength of nematic liquid crystal 4-cyano-4'-n-pentylbiphenyl (5CB). Upon rubbing, the PI-LB films showed a significant increase in…
Four new chiral series with benzoate cores have been synthesized and characterized. The mesomorphic properties have been analysed by optical microscopy on the pure enantiomeric and the racemic compounds and on mixtures, by D.S.C. and by electro-optic measurements. Three of the series (hydrogenous, monofluoro-substitut…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Acidity and Properties of Titania-Silica CatalystsMercedes Galan-Fereres, Luis J. Alemany, Rafael Mariscal, Miguel A. Banares, James A. Anderson, and Jose L. G. FierroCite this: Chem. Mater. 1995, 7, 7, 1342–1348Publication Date (Print):July 1, 1995Publication Histor…