Materials Literature
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An electron spectrometer is described for use in threshold photoionisation studies. The spectrometer incorporates a penetrating field extractor stage, a 127 degrees cylindrical deflection analyser and an electrostatic lens system to match the two together. The high collection efficiency, resolution, transmission and s…
Unidirectional L-phenylalanine transport into six brain regions of pentobarbital-anesthetized rats was studied using the in situ brain perfusion technique. This technique allows both accurate measurements of cerebrovascular amino acid transport and complete control of perfusate amino acid composition. L-Phenylalanine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, spectroscopic, and structural studies of extremely short chain basket handle porphyrins and their zinc(II) complexesUrsula Simonis, F. Ann Walker, Patricia Lani Lee, Bernard J. Hanquet, Dieter J. Meyerhoff, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1987, 1…
The map of the intermolecular overlap integrals(S) of the lowest unoccupied molecular orbital(LUMO) of Ni(dmit) 2 was calculated by varying the intermolecular configuration parameters in order to examine the dimensionality of the electronic band structure of the molecular conductors based on Ni(dmit) 2 . Despite the s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of tautomerism in 2-substituted 5,10,15,20-tetraphenylporphyrins: directionality of proton transfer between the inner nitrogensMaxwell J. Crossley, Leslie D. Field, Margaret M. Harding, and Sever SternhellCite this: J. Am. Chem. Soc. 1987, 109, 8, 2335–2341Publicati…
Abstract not Available.
Three grades of polyethylene differing mainly in their molecular weight were irradiation and peroxide crosslinked. Their gel content, degree of swelling, melting temperature, degree of crystallinity, and tensile properties were determined. The irradiation and peroxide crosslinking of the same polymers makes it possibl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure of orthosilicic acid, silanol, and H3SiOH.cntdot.AlH3 complex: models of surface hydroxyls in silica and zeolitesJoachim. SauerCite this: J. Phys. Chem. 1987, 91, 9, 2315–2319Publication Date (Print):April 1, 1987Publication History Published online1 May…
Abstract Geveral new polyimides were prepared from the reaction of four aromatic dianhydrides with four new diamines containing carbonyl and ether connecting groups between the aromatic rings. The diamines were prepared from the reaction of 4‐aminophenol with activated aromatic difluoro compounds in the presence of po…
[111]-oriented PZT films have been successfully grown with good epitaxy onto epitaxial platinum film substrates by the rf-magnetron sputtering method using Pb enriched PZT(90/10) targets. The sputtering conditions for growing epitaxial films were investigated. Crystallographic identifications of the films were made by…
Abstract Pillaring of montmorillonite and beidellite with aluminum polyhydroxypolymer takes place first by the saturation of the cation-exchange capacity by monomeric and/or dimeric aluminum hydroxide species and then the intercalation of the so-called Al 13 -polyhydroxypolymer. The clay slurry must have a solid conce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically controlled release of hexacyanoferrate(4-) from polypyrroleLarry L. Miller, Baruch Zinger, and Qin Xin ZhouCite this: J. Am. Chem. Soc. 1987, 109, 8, 2267–2272Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1…
Abstract Reaction of 2,6-diacetylpyridine with 1,3-diamino-2-propanol in the presence of lanthanoid(III) ions gave complexes of (2+2) macrocyclic tetraimine ligand, H2apdapy. Complexes synthesized have the composition of Ln2(apdapy)(NO3)4(H2O)5 (Ln=La or Pr) or Ln2(apdapy) (NCS)4 (H2O)4 (Ln=La, Pr, Nd, Sm, or Eu). It…
Deformation properties of forsterite have been deduced simultaneously from X-ray diffraction data affected by extinction in Bonn-Pittsburgh (B), and in Groningen (G). For the G crystals, GI and GII, extinction is anisotropic and considerably larger than for crystal B. Measurements were made with Mo radiation for B, an…
In the thermally stimulated luminescence (TSL) of quartz there is always a glow peak at T=100 °C, whose sensitivity (response to a unit irradiation dose) increases after repeated irradiations followed by heating. This phenomenon, known as predose, has been studied in synthetic quartzes, both as grown and deprived of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of bridgehead-substituted polycycloalkanes. Synthesis and NMR analysis of nitrogen-15-labeled 1-aminobicycloalkanes and their hydrochloridesE. W. Della, B. Kasum, and K. P. KirkbrideCite this: J. Am. Chem. Soc. 1987, 109, 9, 2746–2749Publication Date (Print):April…
Abstract An electrochemically prepared polypyrrole(PPy)/poly(N-methylpyrrole)(PMPy) composite polymer film(PPy-PMPy) was used as a cathode active material of a rechargeable lithium battery. The charging-discharging behavior of a Li/LiClO4/(PPy-PMPy) battery was studied and compared with those of Li/LiClO4/PPy and Li/L…
Polycrystalline samples of Sr2Zn2Fe28O46 (SrZn-X) hexagonal ferrite have been prepared by the chemical coprecipitation method. The saturation magnetization and anisotropy field measured at room temperature were found to be 79.4 emu/g and 12.4 kOe, respectively. The Curie temperature is 710±5 K. The temperature depende…
The pitting resistance of AISI 316L stainless steel (SS) weld metal in as-deposited and aged conditions was evaluated by determining the critical pitting potential in an acid chloride solution. The results indicated that after aging at 773, 873, or 973 K, the pitting corrosion resistance of the weld metal had deterior…
Alumina powder compacts sintered at various temperatures were isostatically hot‐pressed. The specimens sintered to the closed‐pore state can be densified further by hot isostatic pressing. If the open pores are eliminated during sintering, sintering at a low temperature is desirable to achieve a full densification aft…