Materials Literature
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The oxidation of BN composite interphases was examined with a series of model materials. Oxidation was examined in both low‐water‐vapor (∼20 ppm H 2 O/O 2 ) environments at 900°C and high‐water‐vapor (1% and 10% H 2 O/O 2 ) environments at 700° and 800°C. The low‐water‐vapor case was explored with layered BN/SiC mater…
The stability of Gd‐doped and La‐doped in water‐containing atmospheres was examined. Samples containing up to 20 mol % Gd and 30 mol % La were synthesized by calcining the requisite mixtures of precursors. Three types of tests were performed: ( i ) thermal treatment in an atmosphere containing water vapor between 150…
The oxidation state of alumina- and titania-supported Ru catalysts has been investigated as a function of reduction temperature, as well as by following the interaction with a methane−oxygen mixture at 773 and 973 K, employing XPS and FTIR techniques. It is found that the chemical behavior of Ru depends strongly on th…
Material Cultures: Why Some Things Matter. Daniel Miller. ed. Chicago: University of Chicago Press, 1998. 244 pp.
The preparation of carbon nitride nanotubes has proved extremely difficult—to date only small quantities of nitrogen (≤5%) have been incorporated into carbon nanotubes or filaments and the synthesis of crystalline C3N4 and CN nanotubes with their interesting predicted properties remains a challenge for the future. Now…
Analytical ultracentrifugation is a classical method of biochemistry and molecular biology. Because it is a primary technique, sedimentation can provide first-principle hydrodynamic and first-principle thermodynamic information for nearly any molecule, in a wide range of solvents and over a wide range of solute concen…
Room-temperature volume measurements of the complete set of calcite-structure carbonates in the pressure range 0-8.1 GPa revealed systematic differences in compressibilities that depend on cation type, resulting in significant deviations from empirical relations of an inverse linear correlation between K 0 and V 0 .…
The defect structure of cubic fluorite structured yttria-stabilized zirconia $({\mathrm{ZrO}}_{2}{)}_{1\ensuremath{-}x}({\mathrm{Y}}_{2}{\mathrm{O}}_{3}{)}_{x}$ has been investigated over the composition range $0.100(4)<~x<~0.241(10)$ and temperatures $T(K)$ up to 2780(10) K, using single-crystal specimens. Anal…
Abstract This paper presents the mechanical and thermal properties of unidirectional, degradable, environment‐friendly “green” composites made from pineapple fibers and poly(hydroxybutyrate‐co‐valerate) (PHBV) resin. Tensile and flexural properties of the “green” composites with different fiber contents were measured…
The solution structure and dynamics of metal-bound water exchange have been investigated in a series of lanthanide complexes of primary, secondary, and tertiary tetraamide derivatives of 1,4,7,10-tetraazacyclododecane. In the gadolinium complexes at ambient pH, water exchange lifetimes (τ m ) determined by 17 O NMR we…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTX-ray Analysis of Structural Changes in Photochromic Salicylideneaniline Crystals. Solid-State Reaction Induced by Two-Photon ExcitationJun Harada, Hidehiro Uekusa, and Yuji OhashiView Author Information CREST Japan Science and Technology Corporation (JST) Department o…
Synthetic epidotes were produced using a Tuttle type hydrothermal vessel in the temperature range from 500 to 700 ℃ and at 4.5 to 5.0 kbars pressure. Single-crystal X-ray diffraction structure refinements yielded intracrystalline cation distributions for two crystals grown at 600 ℃ (0.68 and 0.73 Fe apfu) and five cry…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTHot Spot Conditions during Cavitation in WaterYuri T. Didenko, William B. McNamara, and Kenneth S. SuslickView Author Information Department of Chemistry, University of Illinois at Urbana-Champaign, 601 S. Goodwin Avenue, Urbana, IL 61801 Cite this: J. Am. Chem. Soc. 1…
The chemical structure and bonding of Al 4 C and Al 4 C - have been studied by photoelectron spectroscopy and ab initio calculations. While Al 4 C is known to be a tetrahedral molecule, the data reported here suggest that Al 4 C - has D 4 h symmetry (when averaged over zero-point vibrational motions) and thus is the s…
The optical properties of high quality single crystal epitaxial zinc oxide thin films grown by pulsed laser deposition on c-plane sapphire substrates were studied. It was found that annealing the films in oxygen dramatically improved the optical and electrical properties. The absorption coefficient, band gap, and exci…
An inductive technique for the measurement of dynamical magnetic processes in thin-film materials is described. The technique is demonstrated using 50 nm films of Permalloy (Ni81Fe19). Data are presented for impulse- and step-response experiments with the applied field pulse oriented in the plane of the film and trans…
Multilayer films of the proteins fluorescein isothiocyanate-labeled bovine serum albumin (FITC-BSA) and immunoglobulin G (IgG) were assembled on 640 nm diameter polystyrene (PS) latex particles by their alternate deposition with either positively or negatively charged polyelectrolytes. The proteins and polyelectrolyte…
The program PDFFIT is designed for the full profile structural refinement of the atomic pair distribution function (PDF). In contrast to conventional structure refinement based on Bragg intensities, the PDF probes the local structure of the studied material. The program presented here allows the refinement of atomic p…
We have examined the interaction of molecular oxygen with the TiO 2 (110) surface using temperature-programmed desorption (TPD), isotopic labeling studies, sticking probability measurements, and electron energy loss spectroscopy (ELS). Molecular oxygen does not adsorb on the TiO 2 (110) surface in the temperature rang…
We use extensive classical molecular-dynamics simulations to calculate the thermal conductivity of a model silica glass. Apart from the potential parameters, this is done with no other adjustable quantity and the standard equations of heat transport are used directly in the simulation box. The calculations have been d…