Materials Literature
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Air separation of a cholesteric liquid crystalline triheptyl cellulose/ethyl cellulose (3/97) binary composite membrane prepared from tetrahydrofuran, chloroform, and dichloromethane solutions was studied at different pressure differences across the membrane by the variable volume method. With an increasing pressure d…
Introduction Much work has been done on the phenomenon of electropolishing since it was discovered by Jaquat. Most of this work was directed towards the elucidation of the polishing mechanism as well as establishing conditions for polishing of different metals and alloys. Studies on the polishing mechanism have reveal…
A novel starburst molecule, 4,4′,4″-tri(N-phenoxazinyl)triphenylamine (TPOTA), has been synthesized, and its molecular properties and morphology investigated. TPOTA readily forms a stable amorphous glass with a glass transition temperature as high as 145[ddot]C when the melt sample is cooled down on standing, as chara…
By adjusting the particle size distribution of the Sm/sub 2/Fe/sub 17/ alloy-powder the density of cold isostatically pressed (p=200 MPa) magnets as well as of die-pressed (p=600 MPa) magnets could be improved up to 72% of the theoretical density. A remanent polarization and a coercivity of 0.77 T and 10.8 kA/cm could…
Cast thin films of the composites PVA-CrCl 3 were prepared. The absorption spectra, X-ray diffraction, hardness number and dielectric constant were measured before and after irradiation by neutrons in the fluence range of 3.4 × 10 5 to 1.68 × 10 8 n/cm 2 . The Racah constant was calculated to be 600 cm -1 which is abo…
Abstract The synthesis of styrenic monomers that have pyrazolic or bipyrazolic pendant groups is described. Their homopolymerization and their copolymerization with maleic anhydride (MA) and N ‐(3‐acetoxy propyl) maleimide is reported. The monomers were prepared from the Williamson reaction between 2‐pyridine carbinol…
The dependence on the substrate temperature and the flux rates of the behavior of impinging elemental Si and Ge fluxes on a SiO2 surface, including SiO2 etching and the deposition of polycrystalline Si and SiGe films, was investigated by using the solid source molecular beam epitaxy (MBE). Flux rates of the source bea…
Abstract For an electrocatalytic oxidation of cyclohexene in an air-equilibrated acetonitrile solution containing (5,10,15,20-tetraphenylporphyrinato)manganese(III) as a catalyst, benzoic anhydride as an acylating reagent and 1-methylimidazole as a ligand to Mn porphyrin, the addition of the compounds such as Methylen…
Two binary mixtures of polar liquid crystal materials were previously reported to exhibit three incommensurate smectic A phases predicted for such materials on the basis of phenomenological theory. Results of our recent high-resolution X-ray scattering experiments show that no incommensurate phases exist in the two sy…
Motivated by the need for highly efficient far-IR Fabry-Perot étalons for airborne and space astronomy, we have developed a high-yield photolithographic technique for producing low-loss metal-mesh reflectors. We describe the production technique and report on the mesh flatness and uniformity. Optical measurements of m…
A new first principle approach to the problem of ferroelectric instability is advanced. This model-free approach permits to investigate the role of dipolar forces in the origin of ferroelectric instability in crystals of arbitrarily low ionicity possessing finite but anyhow small dielectric gap width in the electronic…
SUMMARY The results of a laboratory study carried out to investigate copper deposition and localized corrosion on API N-80 carbon steel are presented. Hydrochloric acid-based stimulation fluids and a recovered worn-out acid sample from the field were used in the tests. To all the tested fluids a copper-based corrosion…
We have studied the static magnetic properties of nanocrystalline Co-Ti doped barium ferrite BaFe/sub 10.4/Co/sub 0.8/Ti/sub 0.8/O/sub 19/. The zero-field-cooled (ZFC) and field-cooled (FC) processes show the typical features of a small particle system. The dependence on temperature of the coercive field is discussed…
We report the gated detection of reflection high-energy electron diffraction (RHEED) signal intensity oscillations during molecular-beam epitaxy (MBE) while the wafer is being rotated at high speed (≳100 rpm). In general, a larger number of oscillation periods are observed with this technique than during stationary me…
Abstract The sulfur vulcanization chemistry of cis -polyisoprene formulations accelerated with N- t -butyl-2-benzothiazole sulfenimide (TBSI) is compared to the chemistry of equivalent formulations accelerated with N- t -2-benzothiazole sulfenamide (TBBS). High performance liquid chromatographic analysis (HPLC) is uti…
Two experiments on the plasma-driven permeation (PDP) of deuterium through nickel membranes were conducted. One was an observation of the permeation during the discharge cleaning of Heliotron E, one of the largest helical systems. Significant amounts of deuterium permeated. The deuterium permeation was also observed d…
In the present work, the influence of Cr on mechanical properties and microstructure of weld metal from a high-strength SMA electrode is analyzed by considering 12 experimental low-alloy low-hydrogen iron powder AWS E10018, E11018, E12018-M type covered electrodes. These electrodes were manufactured to obtain in the w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnprecedented Oxidative Decarboxylation of .alpha.-Amino-.alpha.-methylmalonate on a "Hindered" Cyclic TetraamineCobalt(III) ComplexMorio Yashiro, Shuji Miura, Takayuki Matsuyama, Sadao Yoshikawa, Makoto Komiyama, and Shigenobu YanoCite this: Inorg. Chem. 1994, 33, 6, 1003–1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupercritical Fluid Fractionation of a Low Molecular Weight, High-Density Polyethylene Wax Using Carbon Dioxide, Propane, and Propane-Modified Carbon DioxideJim C. Via, Cheryl L. Braue, and Larry T. TaylorCite this: Anal. Chem. 1994, 66, 5, 603–609Publication Date (Print):Ma…
A two-dimensional mathematical model of the carding process considers the lon gitudinal transport of fibers on the surface of the main cylinder and fiber diffusion in the transverse direction. The weight functions of the dynamic model in the longitudinal and transverse directions are derived, and the two-dimensional t…