Materials Literature
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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…
Abstract The melting points of miscible blends prepared from two crystalline polymers, poly(caprolactone) (PCL), and Saran a random copolymer of vinylidene chloride with vinyl chloride [P(VCl 2 ‐VC)], vinyl acetate [P(VCl 2 ‐VA)], or acrylonitrile [P(VCl 2 ‐AN)], have been measured by differential scanning calorimetry…
Published reports suggest that silver ions may catalyze the oxidation of poly(ether)urethane soft-segments resulting in the failure of urethane insulations of specific models of pacemaker leads. Attempted oxidation of soft-segment models, poly(tetra-methylene ether)glycols, by silver nitrate has shown that metal-ion c…
An analytical method has been developed for assessing crash dynamics of large transport aircraft, such as in the NASA Controlled Impact Demonstration (CID) jet crash test on December 1, 1984. The DYCAST nonlinear finite-element computer code was used in a series of progressively more difficult tasks to model complete…
Abstract Secondary‐structure prediction has been used to investigate the conformation of the N‐ and C‐terminal telopeptides for type I and type III collagen. The three predictive methods (Chou and Fasman, Robson and co‐workers, Lim) indicate mainly aperiodic conformations. A common structural motif is provided by the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization kinetics of poly(propylene terephthalate) studied by rapid-scanning Raman spectroscopy and FT-IR spectroscopyBernard J. Bulkin, Menachem Lewin, and Jongsoo KimCite this: Macromolecules 1987, 20, 4, 830–835Publication Date (Print):April 1, 1987Publication Hist…
The optical properties of MgF(2) films prepared by evaporation and ion-assisted deposition have been determined from transmittance and near-normal incidence reflectance measurements and also from electron-energy loss spectroscopy (EELS). The results show that oxygen-ion assistance leads to higher extinction coefficien…
Abstract A model of pore structure evolution has been developed for gas‐solid reactions exhibiting pore closure behavior. A cylindrical pore network of constant coordination number is used to represent the porous medium, and both discrete and continuous distributions of pore size are considered. The mathematical model…
Abstract The synthesis of the liquid crystalline polysiloxanes 8a‐c is reported. In these polymers carbazolyl groups are incorporated in the mesogenic units. 8a‐c were prepared from the Schiff's bases 7a‐c and poly(hydrogenmethylsiloxane) in a polymer analogous reaction. The liquid crystalline polymers were characteri…
Abstract The formal redox potentials of 12-molybdophosphate and 12-molybdosilicate up to the twelve-electron reduction per heteropolymolybdate ion were determined by cyclic voltammetry at a glassy carbon electrode in 50% (v/v) water-organic media containing some inorganic acids. These heteropolymolybdates in the prese…
Abstract Three binuclear copper(II) complexes of N,N′,N″,N'″-tetrakis(2-aminoethyl)-1,4,8,11-tetraazacyclotetradecane (taec), [Cu2(taec)N3](ClO4)3 (1), [Cu2(taec)(NCO)](ClO4)3 (2), and [Cu2(taec)(NCS)2](ClO4)2·H2O (3), were prepared and characterized. The crystal structures of these complexes were determined by single…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of manganese(IV)-oxo-porphyrin derivatives by decomposition of peroxycarbonate complexesM. Schappacher and R. WeissCite this: Inorg. Chem. 1987, 26, 8, 1189–1190Publication Date (Print):April 1, 1987Publication History Published online1 May 2002Published inissue 1…