Materials Literature
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We report here the discovery of a new bcc 1/1 crystal approximant (W-phase) to the stable icosahedral quasicrystal (i-phase) discovered recently in Ti-Zr-Ni alloys. As-cast Ti-Zr-Ni ingots, which originally contain only the C14 Laves and the hcp solid-solution phases, transform almost completely to the i-phase after a…
A novel laminar oxide composite was developed. This oxide laminate, which was fabricated by hot pressing, consisted of three types of layers, which were stacked in a repeating sequence of YPO4, yttria‐stabilized ZrO 2 , 30 vol% yttria‐stabilized ZrO 2 ‐70 vol% Al 2 O 3 , and yttria‐stabilized ZrO 2 . The behavior of t…
Solid solutions in the Gd 2 (Ti1‐yMoy)2O7 pyrochlore system, with y = 0.1, 0.3, 0.5, and 0.7, have been investigated as potential candidates for the anode material of solid‐oxide fuel cells. The electrical conductivity, stability range, and optimal synthesis conditions of the pyrochlore phase have been explored by ele…
We present an experimental technique for the inflation of freely suspended films of thermotropic smectic liquid crystals to macroscopic bubbles. These bubbles have many properties in common with well known lyotropic soap bubbles, but on the other hand represent a completely different class of material with different p…
The grain-size dependence of nanoscale ordered regions in Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) has been studied using lattice images obtained by transmission electron microscopy. It was found that the size of nanoscale ordered regions, which is strongly related to dielectric properties, depends on the grain size. The nanoscale…
We present results on the spatial distribution of sodium cations in sodium tellurite glasses as a function of sodium oxide content, obtained using a spin-echo NMR experiment. Glasses were studied with sodium oxide content ranging from 10 to 30 mol %. From the decay rate of the spin echo we infer the proximity of sodiu…
Spectroscopic techniques are used to investigate energy transfer and radiation-induced reactions on the surfaces of particulate silicas. Upon subjection to high energy radiation, hydrogen atoms are produced with significant yields in all silica samples pretreated at 150 °C, for an example, G (H) = 4.2 in silica gel Da…
The present necessity to use heat-resistant materials in electronics justified the scientific interest in different heterocyclic polymers. This paper is especially concerned with the preparation of novel heat-resistant materials having benzimidazole moieties in the main chain. The poly(ether benzimidazole)s were prepa…
UDP-galactose 4-epimerase plays a critical role in sugar metabolism by catalyzing the interconversion of UDP-galactose and UDP-glucose. Originally, it was assumed that the enzyme contained a "traditional" catalytic base that served to abstract a proton from the 4'-hydroxyl group of the UDP-glucose or UDP-galactose sub…
We have studied stable structures of hydrogenated Si clusters grown from silane gas in an ion trap developed for cluster growth. The grown clusters were extracted from the ion trap through two different pathways and were analyzed by mass spectrometers. The Si6Hx+ cations were stably grown, among them clusters with x=1…
Oligomerization of a mixture of monomeric iron(III) 2-hydroxy-5,10,15,20-tetraphenylporphyrin, (2-OH-TPP)Fe(III)Cl, manganese(III) 2-hydroxy-5,10,15,20-tetraphenylporphyrin, (2-OH-TPP)Mn(III)Cl, and gallium(III) 2-hydroxy-5,10,15,20-tetraphenylporphyrin, (2-OH-TPP)Ga(III)Cl, complexes affords the series of heterometal…
A lead zirconate titanate ( Pb(Zr, Ti)O 3 , PZT) thick film was produced using the Jet Molding System which was developed from a gas deposition method. Some of the characteristics of the deposited lead zirconate titanate were determined by X-ray diffraction, scanning electron microscopy and atomic force microscopy. Th…
A series of μ-tto- (tto = C 2 S 4 2 - = tetrathiooxalato) bridged bimetallic Ni(II) complexes with the general formula (Y) 2 {tto[Ni(L)] 2 } (where Y = Bu 4 N +, L = dsit = C 3 Se 2 S 3 2 - = 2-thioxo-1,3-dithiole-4,5-diselenolato ( 2 ) and dmise = C 3 SeS 4 2 - = 2-selenoxo-1,3-dithiole-4,5-dithiolato ( 3 ); and wher…
We report a chemical, thermogravimetric, and electron-diffraction/microscopy study of a tin-monoxide phase. A large deviation from the ideal stoichiometry is observed due to metal vacancies, resulting in the formula ${\mathrm{Sn}}_{1\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}\mathrm{O}.$ This nonstoichiometry…
As proton concentration increases, the first two reversible (1 e - )-reduction processes of the anion α-[S 2 Mo 18 O 62 ] 4 - in 95/5 MeCN/H 2 O convert to an overall (2 e - )-reduction process. Half-wave potentials for reversible one-electron reduction of [S 2 Mo 18 O 62 ] 4 - itself and its two one-electron-reduced…
Many fabric mechanics researchers have reported that specimens being tested on the KES shear tester are not subjected to pure shear deformation; therefore, test results cannot lead directly to a determination of the fabric shear modulus and stress/strain relationship, particularly in the nonlinear range of stress-stra…
We have studied the fire behavior and the heat transfer in the in tumescent formulations polypropylene (PP)-ammonium polyphosphate (APP)/pentaerythritol (PER) and PP-Hostaflam AP750 (AP750). We have shown that the fire proofing properties (LOI, UL-94 and cone calorimeter) of PP was strongly improved using the commerci…
The voltammetric response of an electrode covered with an electroactive self-assembled monolayer is modeled including discreteness of charge effects and interfacial ion association. Discreteness of charge potentials are estimated according to the hexagonal array model of Macdonald and Barlow, and results are compared…
The measured macroscopic growth rates of the (110) face of tetragonal lysozyme show an unexpectedly complex dependence on the supersaturation. In earlier studies it has been shown that an aggregate growth unit could account for experimental growth-rate trends. In particular molecular packing and interactions in the gr…
Protein p6 from Bacillus subtilis phage phi29 (Mr = 11 800) binds in vitro to DNA forming a large nucleoprotein complex in which the DNA wraps a multimeric protein core. The high intracellular abundance of protein p6 together with its ability to bind the whole phi29 DNA in vitro strongly suggests that it plays a role…