Materials Literature
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Carbon supported electrocatalysts for the reduction of oxygen can be screened quickly by using a rotating disk electrode (RDE) when an appropriate material is used as a binder to hold the catalyst on the disk electrode. The results obtained with the RDE in an oxygen‐saturated solution mimic those measured for a full‐c…
A quantitative approach is used in this work to reproduce the solubility profile of drugs in solvent mixtures showing two solubility maxima. The solubilities of sulfanilamide and sulfamethazine were determined at 25°C in two mixtures of varying polarity (ethyl acetate-ethanol and ethanol-water). A plot of the mole fra…
The dependence of specific dielectric properties of polymers on their fundamental molecular parameters was investigated as part of a study involving HV insulation in spacecraft systems. As part of an effort to understand the causes of dielectric breakdown, this investigation focused on the effect of polymer morphology…
Tetramethylammonium saponite film has been prepared and its structure has been characterized. By casting the aqueous suspension of the tetramethylammonium–saponite, a transparent film was obtained. The film is composed of oriented silicate particles with ab planes parallel to the substrate. The interlayer tetramethyla…
A study of the growth of a-SiC:H films by plasma-enhanced chemical vapor deposition (PECVD) from two organosilicon precursors, silacyclobutane (H2CH2SiCH2CH2 or SCB) and methylsilane (CH3SiH3), is described. A capacitively coupled, parallel plate PECVD system was used to grow films at 250 °C and deposition pressure of…
Abstract Porous and finely divided solids are distinguished by a large surface to volume ratio. As a result, they have specific properties, such as enhanced reactivity, a high adsorption capacity, and a lowered sinter temperature. This contribution gives a survey over selected aspects of porous solids, with the main e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis of methyl-branched poly(.beta.-hydroxyalkanoate)s by Pseudomonas oleovoransBaki Hazer, Robert W. Lenz, and R. Clinton FullerCite this: Macromolecules 1994, 27, 1, 45–49Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Publishe…
Detailed analysis by induced CD spectroscopy has revealed that the manganese porphyrin, Mn(tmpyp), binds the major groove of AT or GC sequences in DNA, as well as the reported minor groove of AT sequences, with a preference that depends on the porphyrin to DNA base-pair molar ratio.
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…