Materials Literature
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Additions of Bi 2 O 3 were used to promote grain growth and to increase magnetic permeability during sintering of MnZn ferrites. The results showed that small additions of Bi 2 O 3 of <0.05 wt% remarkably increase the permeability of MnZn ferrites. On the other hand, addition of 0.05 wt% Bi 2 O 3 induced the format…
The oxidative durability of a SiC‐SiC composite with Hi‐Nicalon fiber and a BN interphase was investigated at 800°C (where pesting is known to occur in SiC‐SiC composites) for exposure durations of up to 500 h and in a variety of oxidant mixes and flow rates, ranging from quasi‐stagnant room air, through slow‐flowing…
The properties of convex gratings fabricated by electron-beam lithography are investigated. Three grating types are shown. The first is a single-panel, true blazed grating in which the blaze angle stays constant relative to the local surface normal. This grating provides high peak efficiencies of approximately 88% in…
ABSTRACT Tensile strength (TS), percent elongation (%E), oxygen permeability (OP), and water vapor permeability (WVP) of lactic acid and rennet precipitated casein‐based edible films were studied to determine the effect of protein to plasticizer ratio (0.6:1, 1:1, 1.4:1) and plasticizer type (sorbitol, glycerol) on th…
Abstract A method for predicting the shape of solution‐grown organic crystals is presented. The shapes depend on properties of their internal crystal structure, as well as on the processing environment. The model developed here can account for the effects of solvent and may be extended to account for the influence of…
The binary compounds Ca 3 Al 2 O 6 (C 3 A), Ca 12 Al 14 O 33 (C 12 A 7 ), CaAl 2 O 4 (CA), CaAl 4 O 7 (CA 2 ), and CaAl 12 O 19 (CA 6 ) in the CaO‐Al 2 O 3 system have been synthesized as high‐compound‐purity ceramic powders by using the self‐propagating combustion synthesis (SPCS) method. Materials characterization o…
A nuclei size measurement technique is developed, based on a dispersion relation for propagation of sound waves through a bubbly liquid. This is used to relate the attenuation and phase velocity of a sound wave to the bubble population, leading to two integral equations. These equations are ill posed, and require spec…
Crystallography at sub-atomic resolution permits the observation and measurement of the non-spherical character of the electron density (parameterized as multipoles) and of the atomic charges. This fine description of the electron density can be extended to structures of lower resolution by applying the notion of tran…
The electrochemistry of (OEC)M where M = Mn, Co, Ni, or Cu and OEC is the trianion of 2,3,7,8,12,13,17,18-octaethylcorrole was investigated in dichloromethane, benzonitrile, or pyridine, and the oxidized compounds were characterized by UV−visible and/or ESR spectroscopy. The first two oxidations of the Co, Ni, and Cu…
Optimized syntheses of 5,15-diphenylporphyrin (DPP, 1) and its dipyrrolic precursors are described. A novel procedure for the synthesis of dipyrromethane (2), prepared by hydrodesulfurization of the corresponding di-2-pyrrolylthione (8), is presented, as well as an improved method to isolate large quantities of 5-phen…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and Properties of the Longest Oligothiophenes: The Icosamer and HeptacosamerHidetaka Nakanishi, Naoto Sumi, Yoshio Aso, and Tetsuo OtsuboView Author Information Department of Applied Chemistry, Faculty of Engineering, Hiroshima University, Higashi-Hiroshima 7…
Analysis of data on the chemical composition of primary fluid inclusions (brine inclusions) in primary‐bedded halite from many evaporite formations of northern Pangea shows that during the Phanerozoic the chemical composition of marine brines was oscillating significantly between the Na‐K‐Mg‐Ca‐Cl type and the Na‐K‐Mg…
Fourier transform infrared spectroscopy and X‐ray photoelectron spectroscopy were used to monitor the chemical composition of both ladder and cage hydrogen silsesquioxane (HSQ) as a function of bake and cure temperature in the range 150–425°C. Three distinct chemical compositions evolve as the temperature of the HSQ f…
The unique structure and reactivity of cellulose opens up various possibilities for the design of advanced materials based on this biomacromolecule. In the present feature the state of the art of selected cellulose functionalization reactions is discussed adequately considering own research results. In particular, new…
Biological apatite-crystal formation is a complex process starting with heterogeneous nucleation of inorganic calcium phosphate on an organic extracellular matrix [Cuisinier et al. (1995), J. Cryst. Growth, 156, 443-453]. Further stages of crystal growth are also controlled by the organic matrix and both nucleation an…
A phenol-based “end-off” compartmental ligand, 2-[ N, N -di(2-pyridylmethyl)aminomethyl]-6-{ N -[2-(dimethylamino)ethyl]iminomethyl}-4-methylphenol (HL), having an iminic bidentate and an aminic tridentate chelating arms on the 2- and 6-positions of the phenolic ring, respectively, forms dinuclear nickel complexes [Ni…
The flow properties of suspensions of weakly attractive particles are investigated as a function of volume fraction and strength of interparticle attraction. The suspensions are composed of uniform silica spheres with covalently bound octadecyl chains with diameters 100–125 nm suspended in decalin and tetradecane. At…
The adaptive finite-element method proposed in our previous work [Phys. Rev. B 54 (1996) 7602] is extended to fully self-consistent calculations of realistic materials. Our method is highly adaptive, sparse, parallel, and suited for the O(N) methods, thanks to the localized finite-element basis functions. Accurate ion…
Ammonium is an important nitrogen source for many microorganisms and plants. Ammonium transporters whose activity can be probed with [14C]methylammonium have been described in several organisms including some cyanobacteria, and amt genes encoding ammonium/methylammonium permeases have been recently identified in yeast…
We have used Brillouin light scattering (BLS) to measure the room-temperature, high-frequency mechanical properties of thin freely standing polystyrene (PS) films. We have investigated the effects of chain confinement and the free surface on the mechanical properties by measuring the velocity of film-guided acoustic p…