Materials Literature
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The high-temperature phase of Pb(Mg 1/2 W 1/2 )O 3 , Pb(Co 1/2 W 1/2 )O 3 and Pb(Yb 1/2 Nb 1/2 )O 3 belongs to the space group Fm 3 m with the unit cell size of 2 a c ×2 a c ×2 a c where a c is the lattice parameter of the cubic perovskite unit cell. All these complex perovskites undergo phase transition into low-temp…
The mode I, mode II, and combined mode I–mode II fracture behaviors of a coarse‐grained silicon nitride, a fine‐grained silicon nitride, and an alumina were investigated. These ceramics were fractured from two types of fracture initiating flaws: small surface flaws and large single edge precracks. The small surface fl…
Several technetium-99 BATO (boronic acid adduct of technetium dioximes) complexes TcX(dioxime)3BR (X = Cl) that contain a boron cap R which bears a 2- or 4-nitroimidazole moiety have been prepared from either TcCl(dioxime)3 or from Tc(dioxime)3(mu-OH)SnCl3 [dioxime = dimethyl glyoxime (DMG) or cyclohexanedione dioxime…
RATIONALE AND OBJECTIVES: The objective of the present investigation was to demonstrate a new method for the production of iopromide-carrying liposomes. We studied biodistribution and elimination behavior, as well as the computed tomography (CT) liver imaging properties. METHODS: Iopromide-containing liposomes were pr…
Experimental spectroscopic and time-resolved luminescence measurements of the ${\mathrm{Ti}}^{3+}$:${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ crystalline system have been performed. The absorption and fluorescence spectra obtained have led to a reconsideration of prevailing theoretical models for the radiative relaxation p…
Tetraethoxysilane/oxygen (TEOS/O2) chemistries are now used for low plasma enhanced chemical vapor deposition (PECVD) of SiO2 when high conformality and low temperature are required. The surface processes leading to film growth, carbon elimination, and conformality are not well characterized. We have developed a model…
The ternary phase diagram of Al 2 O 3 ‐La 2 O 3 ‐TiO 2 at 1400°C was determined with 12 compatibility triangles. Al 2 O 3 stabilizes the A‐site‐deficient La 2/3 TiO 3 perovskite structure. According to XRD and microstructural investigations, the solid solution extends along the La 2/3 TiO 3 ‐LaAlO 3 tie line from at l…
The effects of varying the levels of cell disruption achieved by high-pressure homogenization upon subsequent centrifugal separation of cell debris have been defined by measuring sedimentation velocity distributions of the cell debris. Using this data together with particle size distributions, a computer-based model o…
Three kinds of SrTiO3(001) surfaces, TiO2 terminated, SrO terminated, and a mixture of these surfaces, are selectively formed and their surface structures are examined by means of reflection high energy electron diffraction, x-ray photoelectron spectroscopy, and x-ray photoelectron diffraction. The TiO2 terminated sur…
When the ruminal bacterium prevotella ruminicola B(1)4-M was grown in a defined medium with an excess of glucose (3.6 mM ammonia and 50 mM glucose), the cells accumulated large amounts of cellular polysaccharide and the viable cell number decreased at least 1,000-fold. This decrease in viability was correlated with an…
We have carried out ab initio perturbed ion calculations in the rocksalt (B1) and cesium chloride (B2) phases of the alkali (A) chloride (ACl) crystals. Zero temperature (T), and pressure (P) lattice energies and equilibrium distances are computed with errors less than 5%. From static calculations, zero-T equations of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFaradaic charge transfer with double-layer charging and/or adsorption-related charging at polymer-modified electrodes as observed by color impedance spectroscopyT. Amemiya, K. Hashimoto, and A. FujishimaCite this: J. Phys. Chem. 1993, 97, 38, 9736–9740Publication Date (Print…
Abstract The growth kinetics and contact nucleation of calcite crystals were studied in a pH‐stat crystallizer. Large seed crystals up to 230 μm were successfully prepared by the gel growth technique. The crystal growth data over a wide range of crystal sizes were evaluated from titration curves by an initial slope me…
To evaluate the role of surface charge for the blood-brain barrier permeability, the albumin content was determined in the cerebrospinal fluid and in the brain 1 h after intracarotid infusion of protamine sulphate, a natural polycationic protein with a high content of arginine (mol. wt 4000-4400), poly-L-arginine (mol…
The initial growth process of diamond thin films formed by dc plasma chemical vapor deposition on cubic boron nitride ( c BN) surfaces of {111} B , {111} N and {100} has been investigated by scanning electron microscopy (SEM) and Auger electron spectroscopy (AES). On the {111} B surface, it is observed that the carbon…
General expressions for the free energy of the nematic liquid crystal in the interfacial region are derived using the density functional approach. The anisotropic part of the surface tension and the coefficients of the Landau–de Gennes theory for the nematic free surface are expressed in terms of the direct correlatio…
The double-well potential model, well known to describe many low-temperature properties of amorphous materials, has been extended to incorporate effects of high pressures. The resulting model not only explains the temperature and time dependences of pressure-induced phenomena but also provides possible explanations fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxo- and hydroxo-bridged (porphyrin)iron(III)-copper(II) species as cytochrome c oxidase models: acid-base interconversions and x-ray structure of the Fe(III)-(O2-)-Cu(II) complexAlaganandan Nanthakumar, Stephen Fox, Narasimha N. Murthy, Kenneth D. Karlin, Natarajan Ravi, Bo…
We generalize a previous model that was proposed to interpret the thickness dependence of the anchoring energy relevant to the nematic-liquid-crystal--solid substrate interaction. We show that beside the dielectric coupling between the surface electric field and the nematic liquid crystal, the quadrupolar flexoelectri…
Abstract A single-crystal X-ray analysis has revealed that the FeII–edta complex, formulated as Na2[Fe(edta)(H2O)]·2NaClO4·6H2O, has a seven-coordinate structure close to a mono-capped trigonal prism (C2v-CTP). The crystal data are as follows: Orthorhombic, Pmnb, a = 11.404(1), b = 23.573(2), c = 9.915(1) Å, and Z = 4…