Materials Literature
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The surface of an optically transparent electrode has been modified with colloidal particles of ZnO and CdS. Chlorophyll a electrodeposited on these modified electrode surfaces is capable of injecting electrons from its excited state into the conduction band of the semiconductor. The role of the coupled semiconductor…
Abstract The grafting of maleic anhydride (MAH) on high density polyethylene in a counter‐rotating twin screw extruder has been studied. As the reaction kinetics appear to be affected by mass transfer, good micro mixing in the extruder is important. Due to the competing mechanisms of increasing mixing and decreasing r…
The dielectric response of thin films of perovskite ferroelectrics fabricated on electrodes such as indium tin oxide is calculated as a function of frequency, film & barrier layer thickness, and dielectric constant using an equivalent circuit model based on properties of the bulk, the electrode and a series resistance…
UDP-galactose 4-epimerase catalyzes the conversion of UDP-galactose to UDP-glucose during normal galactose metabolism. The molecular structure of UDP-galactose 4-epimerase from Escherichia coli has now been solved to a nominal resolution of 2.5 A. As isolated from E. coli, the molecule is a dimer of chemically identic…
The tetradecapeptide Ac-D-F-L-A-E-G-G-G-V-R-G-P-R-V-OMe, which mimics residues 7f-20f of the A alpha-chain of human fibrinogen, has been co-crystallized with bovine thrombin from ammonium sulfate solutions in space group P2(1) with unit cell dimensions of a = 83.0 A, b = 89.4 A, c = 99.3 A, and beta = 106.6 degrees. T…
Abstract The liquid‐liquid‐plate contact angles of several plate materials were measured using a “preferential wetting method” proposed by the authors. The adhesional work ( I SL ), calculated on the basis of contact angles was utilized to evaluate plate wettability. The experimental results indicate that different pl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 and gallium-71 NMR investigations of alkylammonium gallosilicate solutionsR. F. Mortlock, A. T. Bell, and C. J. RadkeCite this: J. Phys. Chem. 1992, 96, 7, 2968–2975Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published iniss…
This paper presents a new model related to the incorporation of oxygen and carbon in silicon single crystals grown by the Czochralski (Cz) method. The segregation processes of oxygen and carbon involve several chemical species and are not independent. The connection is due to the presence of the molecule not only in t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of electrolyte concentration on axial anion ligation in manganese(III) meso-tetraphenylporphyrin chloridesGarry J. Foran, Robert S. Armstrong, Maxwell J. Crossley, and Peter A. LayCite this: Inorg. Chem. 1992, 31, 8, 1463–1470Publication Date (Print):April 1, 1992Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRapid versus intermediate electronic relaxation between S = 3/2 and S = 1/2 states in nitrosyl-iron complexes with Jaeger-type ligandsE. Koenig, G. Ritter, J. Dengler, and L. F. LarkworthyCite this: Inorg. Chem. 1992, 31, 7, 1196–1202Publication Date (Print):April 1, 1992Pub…
Calibration curves of extremely low concentrations of the alloying elements Sn, Fe, Cr and Ni in Zircaloy were obtained, using standard samples, by energy dispersive X-ray spectroscopy to measure concentration distributions of alloying elements dissolved in the Zircaloy matrix. Their detectable limits were 0.21 at% fo…
This study examines the biocompatibility of two different syn thetic copolymers; a water soluble copolymer based on [N-(2-hydroxypropyl) methacrylamide] (HPMA) and an insoluble polymer based on 2-hydroxyethyl methacrylate (HEMA). Activation of classical and alternative complement pathways, phagocytic function, bone ma…
A computer simulation program, based on a two sublattice model, is performed to analyze the magnetization process of ferromagnetic materials (like, for instance, RCo5 and R2Fe14B compounds). Without using the assumption of the existence of a small canting angle between the two sublattices, as has been used in the anal…
Abstract Some esters of (2‐hydroxypropyl) cellulose have been prepared and studied. Their cholesteric properties change with ageing and may disappear. Accelerated aging has been performed in order to analyze degradation processes which are relevant to the scission of the polymeric main chain and to the hydrolysis of t…
We report molecular-dynamics simulations of the anisotropic diffusion of infinitely thin platelets in the nematic phase. Our simulations are used to distinguish between the predictions of two different theories. The first theory, based on a mapping of the nematic phase of ellipsoidal particles on the hard-sphere fluid…
ω-Vinylpolydimethylsiloxanes (ω-PDMS) and α,ω-divynilpolydimethylsiloxanes (α,ω-PDMS) have been synthesized by anionic polymerization of hexamethylcyclotrisiloxane (D3). The reactions were carried out in n-hexane and tetrahydrofuran (THF), respectively. The initiator was n-butyl-lithium (n-BuLi); tetrahydrofuran was u…
A new procedure of pattern decomposition in energy-dispersive powder diffraction is presented. The total observed pattern is taken as a sum of incoherent and coherent scattering. The incoherent part is calculated from theoretical cross sections for individual atoms, the coherent part is described as a sum of discrete…
The characterisation of platinum group metals catalysts is commonly carried out by temperature-programmed reduction, the spectrum of which has been used as a “finger-print” of the reducibility of the catalyst. Recent literature suggests that the utility of temperature-programmed reduction can be further enhanced by co…
The formation of the oxides of nitrogen, NOx, is examined through experiments and chemical kinetic modeling for lean, premixed combustion in a laboratory, atmospheric pressure, jet-stirred reactor. The experimental conditions are as follows: fuel-air equivalence ratio (φ) of 0.6, temperatures of 1460 to 1730 K, and re…
We have studied the elastic recovery and inverse relaxation phenomena of polyester staple fiber rotor spun yarns. Better fiber orientation obtained with a drawing passage before spinning results in higher permanent deformation and lower delayed elastic recovery of the yarn. Yarn twist has little influence on elastic c…