Materials Literature
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Single-crystal X-ray diffraction studies of the oligomers m-deciphenyl and m-undeciphenyl, isolated chromatographically from low molecular mass poly(m-phenylene), reveal disordered but unequivocally helical chain-structures, from which the crystal and molecular structure of poly(m-phenylene) can be directly inferred.
The magnetic and structural properties of thick pulsed laser deposited (PLD) barium hexaferrite (BaM) films grown on c-plane and m-plane sapphire substrates were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), Rutherford backscattering spectroscopy (RBS), vibrating sample magnetometry (…
The corrosion behavior of α‐Al‐bronze (Cu‐7%Al) was studied in 3.4% solution for extended periods of time using x‐ray diffraction, x‐ray photoelectron spectroscopy, optical and scanning electron microscopy, and electrochemical polarization measurements. Corrosive attack occurs very early leading to general corrosion a…
Deposition of titanium over a silica support was performed by three methods: precipitation with TiCl4 and ammonium hydroxide in aqueous solution; impregnation with titanium(IV) isopropoxide in isopropyl alcohol; grafting with a solution of TiCl4 in hexane. Samples were characterized by BET, XPS, zeta potential, DBS, X…
The surface potential, χ, of several commercial titania powders has been measured by the vibrating condenser method in the temperature range 100–450 °C in air. The K impurity detected by XPS on some of titanias lowers the χ value of TiO2 considerably. A series of K-doped TiO2 anatase samples containing from 1.1 to 11…
The modification of a polypropylene surface in a nitrogen plasma is studied in terms of degradation, crosslinking, functionalization, and activation (radical site creation.) The most important reactions are functionalization through primary amine formation and radical creation through methyl-group elimination. Degrada…
Some trends in modern research of domain kinetics during switching are reviewed. The importance of the complex investigations of model crystals by local and integral experimental methods simultaneously with computer simulation of domains evolution is stressed. Some new experimental results conserning superfast switchi…
The microstructure of oxide layers formed in steam in a 400°C, 10.3-MPa autoclave on different zirconium alloys was studied by transmission electron microscopy. Pre-and post-transition oxide layers on Zircaloy-4 with different heat treatments, and post-transition oxide layers on Zr-0.5Sn-0.53Nb were compared. Special…
The µ-thiocyanato nickel(II) one-dimensional compound, [{NiL(SCN)(µ-SCN)}n][L = bis(3-aminopropyl)methylamine] has been prepared. The crystal structure of this compound has been solved by Patterson synthesis and refined by least-squares analysis to a discrepancy factor of 0.068. The crystals are monoclinic, space grou…
Charge transport mechanisms and the complex impedance of liquid crystal displays are shown to have a strong effect on the electro-optical performance of passive and active matrix addressed twisted nematic and supertwisted nematic LCDs. The static and dynamic dependence of the LCD-performance on liquid crystal material…
This paper deals with the irradiation growth and the radiation-induced changes in the microstructure of Zircaloy-type materials. The experimental irradiations that were conducted at 400°C in Siloé (metallurgical test reactor) and Phénix (fast breeder reactor) show that the growth of both alpha-recrystallized and beta-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPalladium complexes of 21-thiaporphyrin: syntheses and characterizationLechoslaw Latos-Grazynski, Jerzy Lisowski, Piotr Chmielewski, Maria Grzeszczuk, Marilyn M. Olmstead, and Alan L. BalchCite this: Inorg. Chem. 1994, 33, 2, 192–197Publication Date (Print):January 1, 1994Pu…
The adsorptive and reactive behaviour of TiO2, SrTiO3 and SrO towards methanol have been investigated using temperature-programmed desorption and XPS. TiO2 was found to be reduced during the adsorption/desorption process and showed predominantly CH4 formation at low coverages. At higher coverages, alternative paths le…
The galvanic corrosion datafor couples between high alloy stainless steels and other metals in both natural and chlorinated sea water are reviewed. Recommendations for preventive measures are made for the major items used in sea water systems, i.e. valves, heat exchangers, and piping. Some service experiences are pres…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterpolymer complexation of poly(acrylic acid) and polyacrylamide: structural and dynamic studies by solution- and solid-state NMRFred O. Garces, K. Sivadasan, P. Somasundaran, and Nicholas J. TurroCite this: Macromolecules 1994, 27, 1, 272–278Publication Date (Print):Janua…
Natural polycrystalline graphite was compressed using a 6-8-type multianvil and a Drickamer cell, and the recovered samples were examined by x-ray diffraction and transmission-electron microscopy. Diamond was formed in the samples from 14\ensuremath{\sim}20 GPa and 800\ensuremath{\sim}1200 \ifmmode^\circ\else\textdegr…
Three spinels (MgAl2O4, ZnAl2O4 and CaAl2O4) have been synthesized using a sol–gel process coupled with supercritical drying. After calcination at 1000 K, specific areas as high as 300 m2 g–1 can be preserved. Deposition of copper oxide on such carriers leads to the formation of catalysts active in methane combustion.…
Matrix-isolation infrared spectra of trimethyl phosphate (TMP), triethyl phosphate (TEP), and tri- n-butyl phosphate (TBP), in argon and nitrogen matrices, are reported for the first time. The peak widths of the sharpest features in our matrix-isolated spectra are typically 2 cm −1 , compared with peak widths of 40 cm…
Abstract Powders and X-ray size single crystals of the rare earth disilicates RE 2 Si 2 O 7 (RE = La to Nd and Gd to Lu and Y) were synthesized from the melts in a fast crucible-free process. The purity and unit cell parameters of the disilicates were determined from Guinier photographs. Previously reported structure…
Trace elements can reduce the fracture resistance of Zr-2.5Nb pressure tubes. The effects of hydrogen as hydrides and oxygen as an alloy-strengthening agent are well known, but the contributions of carbon, phosphorus, chlorine, and segregated oxygen have only recently been recognized. Carbides and phosphides are britt…