Materials Literature
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Fluorescence and excitation spectra of ${\mathrm{Cm}}^{3+}$ diluted in ${\mathrm{ThO}}_{2}$ powder are reported at room and low temperatures. The observed ${\mathrm{Cm}}^{3+}$ spectra are from the cubic symmetry lattice site and are assigned to phonon-assisted electric dipole transitions and to magnetic dipole transit…
SBR-NBR and CR-NBR blends were prepared with different con centrations, namely 0, 20, 40, 60, 80 and 100%, and measured dielectrically over a wide frequency range (10 -2 -10 6 Hz) and at different temperatures (-10°-25°C). The aim of the present work is to employ the dielectric method to investigate the compatibility…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Route to Reduced Transition-Metal OxidesA. Manthiram, A. Dananjay, and Y. T. ZhuCite this: Chem. Mater. 1994, 6, 10, 1601–1602Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October 1994https://doi.org/10.1021/cm0…
Results of atomistic modeling studies are reported which concern the axial relaxation of a niobium-substituting ${\mathrm{Fe}}^{3+}$ cation relative to an associated oxygen vacancy. The employed methods are shell-model simulations and embedded-cluster calculations. These simulation studies consistently show that the i…
A detailed recipe is given for the refinement of in-plane lattice-parameter and crystallite-size values of a turbostratic graphite-like structure through the profile fitting of the diffraction peaks from random layers. Folding of the theoretical line shape with the experimentally measured instrumental function provide…
A model has been developed to study the aggregation of rodlike particles in two dimensions using diffusion-limited aggregation. The model was also extended to examine the aggregation of rods, with binding rules similar to those seen with collagen molecules. The model showed that the aggregates that were formed from th…
The C–H bond activation of carbon-13 labeled ethane 1,2-di-13C–C2H6 at defect sites on an Ir(111) single-crystalline surface, cut and polished to 0.70°±0.15° of the (111) direction, has been determined quantitatively. These results have been obtained from a kinetic model accounting for diffusion from sites on the less…
We have examined the thermochromic behavior of thin films formed by mixing a fluoran dye (FD: 2 ′ -( o -chloroanilino)-6 ′ -di- n -butylaminospiro[isobenzofuran-1(3 H ),9 ′ -[9 H ]xanthene]-3-one) and octadecylphosphonic acid (P18). The coloring and discoloring states were revealed to be controllable by changing the r…
Abstract Poorly crystalline authigenic alteration products of basic pyroclastics from the Golan Heights, Israel, were investigated by XRD, DTA, TGA, FTIR and chemical analysis. Modeling XRD patterns with the use of NEWMOD code provided a way to identify these clays as random interstratified illite/smectites (I/S) with…
The use of surface-enhanced Raman scattering (SERS) as a detection method in gas chromatography (GC) was investigated by two different approaches; GC eluates were trapped either in liquid silver sol or on solid thin-layer chromatography (TLC) plates, previously coated with silver colloidal solution. Subsequently, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexation of Poly(vinyl alcohol)-Congo Red Aqueous Solutions. 2. SANS and SAXS Studies on Sol-Gel TransitionMitsuhiro Shibayama, Fumiyoshi Ikkai, and Shunji NomuraCite this: Macromolecules 1994, 27, 22, 6383–6388Publication Date (Print):October 1, 1994Publication History…
Merino wool is the result of generations of selection, yet improvements in wool quality and performance are still being sought. Through gene manipulation, sheep transgenesis offers possibilities of understanding the relationship between wool keratin protein composition and fibre structure and properties and of introdu…
Abstract Bromomethyl poly (aryl ether ether ketone) has been prepared from methyl poly (aryl ether ether ketone) (MePEEK) and has been used as the precursor to many forms of functionalized PEEK. MePEEK was brominated directly with bromine. Bromination takes place exclusively at the methyl group. The reaction condition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton NMR Spectroscopy as a Probe of Dinuclear Copper(II) CentersRichard C. Holz and Julie M. BrinkCite this: Inorg. Chem. 1994, 33, 21, 4609–4610Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October 1994https://pu…
The hydrogen embrittlement of Cr–Mo steel has been studied. The effects of tempering temperature on the hydrogen diffusivity and hydrogen assisted cracking, without external stress, are investigated. Hydrogen permeation and trapping, for the various microstructural conditions, were measured using electrochemical equip…
X-ray- and polarized-neutron-diffraction measurements have been carried out on a single crystal of hexagonal ${\mathrm{Y}}_{2}$${\mathrm{Fe}}_{17}$ in order to determine the details of the structural disorder and local-Fe-moment distribution. The crystal structure as determined by X-ray diffraction indicates a disorde…
BACKGROUND: Pulmonary endothelial damage can be caused by agents that generate oxidants, e.g., bleomycin, hyperoxia, neutrophils or x-irradiation. In animals with intravascular cancer cells, there is increased tumor cell arrest and the subsequent formation of metastatic tumors at the sites of such endothelial injury.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly Versatile Methods for the Synthesis of Quinonylporphyrins via Benzannulation of Fischer Carbene Complexes and Palladium-Catalyzed Cross-Coupling ReactionsChi-Shing Chan, Andy K.-S. Tse, and Kin Shing ChanCite this: J. Org. Chem. 1994, 59, 20, 6084–6089Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColloidal Single Crystals of Silica Spheres in Alcoholic Organic Solvents and Their Aqueous MixturesT. OkuboCite this: Langmuir 1994, 10, 10, 3529–3535Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October 1994https:…
The suitability of photodegradation and biodegradation technolo gies for specialty applications is discussed. The research on degradable polymers is reviewed with emphasis on the processes of photooxidation, pho tostabilization and photosensitization. The degradation mechanisms, reaction products, analytical procedure…