Materials Literature
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Electron spin resonance (ESR) spectra of 3-ethoxy-2-oxobutyraldehydebis( N, N -dimethylthiosemicarbazonato)copper(II) (CuKTSM 2 ) and copper(II) tetraphenylporphyrin (CuTPP), in paraffin oil at various temperatures, as well as in oriented dimyristoylphosphatidylcholine bilayer membranes, at 25 °C, were simulated using…
Catalytic activity of alkali metal carbonates was studied for the combustion of activated carbon grains at 673−773 K by supporting the carbonates on carbon, alumina, and a perovskite-type oxide (La 0.8 Sr 0.2 Cr 0.5 Mn 0.45 Pt 0.05 O 3, LSCMP). Catalytic activity of V 2 O 5 /γ-Al 2 O 3 as a typical transition metal ox…
Solution spectroscopic and chemical behavior was examined in the case of the homoleptic hydridic anion of iron [FeH(6)](4)(-). Examination of the UV-visible spectrum in THF revealed a LMCT band which occurs at 41 x 10(3) cm(-)(1) (epsilon = 1200 L mol(-)(1) cm(-)(1)). A manifold between 470 and 500 nm was consistent w…
This work reports a statistical analysis of the evolution of polygranular segment lengths during high-temperature annealing of Al(Cu) thin-film interconnects with quasi-bamboo microstructures. To create samples of Al(Cu) lines that could be imaged by transmission electron microscopy without breaking or thinning, the l…
The reaction kinetics of crosslinked low density polyethylene (LDPE) foam systems has been investigated. Dicumyl peroxide (DCP) was used as the crosslinker. The crosslinking reaction of LDPE/DCP system is controlled by a first order decomposition of DCP. The reaction kinetics of a chemical blowing agent, azodicarbon a…
To elucidate the interaction mechanism of water-soluble copper(II) tetrakis(4- N -methylpyridyl)porphyrin (Cu II (TMpy-P4)) with synthetic polynucleotides such as poly(dA-dT) 2 and poly(dG-dC) 2, the exciplex formation dynamics of photoexcited Cu II (TMpy-P4) with added polynucleotides have been investigated by using…
ADVERTISEMENT RETURN TO ISSUEPREVNotePreparation of Silica−Lignin XerogelJun'ichi Hayashi, Tetsuo Shoji, Yuuki Watada, and Katsuhiko MuroyamaView Author Information Department of Chemical Engineering, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564, Japan Cite this: Langmuir 1997, 13, 15, 4185–4186Publication D…
The impedance response of a Pt/YSZ (yttria‐stabilized zirconia) interface at 900°C is modified by the passage of direct currents. The initial steady‐state impedance spectra are different from those taken after current interruption. The latter evolve toward a new steady state. The magnitude and equilibration kinetics o…
An investigation is made of electric fields induced in natural dielectrics by mechanical loading and electrical polarization. It is shown that the relaxation of the polarization is identical in nature for both cases and is basically a thermally activated process. The temperature dependence is obtained for the relaxati…
An investigation of organic solvents penetrating into and out of natural rubber (NR) vulcanisates as a function of time was conducted with respect to degree of swelling and deswelling, diffusion characteristics and mechanical properties. The natural rubber was vulcanised using different techniques to obtain various ty…
The corrosion inhibition behavior of sodium tripolyphosphate (Na5P3O10, or TPP) and zinc sulfate (ZnSO4) and the synergistic effects between them were studied for copper in neutral simulated tap water using electrochemical methods, x-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Zn2+ al…
Soft-mode suppression driven by a reversible photoisomerization was experimentally observed in the phase separation process of polystyrene derivatives--poly(vinyl methyl ether) (PS-PVME) mixtures. The phase separation was controlled by manipulating, with ultraviolet light, the reversible changes in polymer segmental v…
The decomposition of diborane (B2H6) has been studied on the Ni(100) surface by means of thermal desorption spectrometry (TDS), x-ray photoelectron spectroscopy (XPS), and low-energy electron diffraction (LEED). At low gas exposures, decomposed B2H6 on the Ni(100) surface at low temperatures produces several peaks in…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTUsing Porous Silicon as a Hydrogenating Agent: Derivatization of the Surface of Luminescent Nanocrystalline Silicon with BenzoquinoneTheresa F. Harper and Michael J. SailorView Author Information Department of Chemistry and Biochemistry University of California, San Di…
Titanium oxide ( TiO 2 ) thin films were prepared by rf-sputtering in an Ar/O 2 atmosphere from a compressed powder TiO 2 target and their electrochromic (EC) phenomena were investigated. Films prepared under the sputtering pressures of 1.3, 4.0 and 6.7 Pa were confirmed by X-ray diffraction to be in amorphous state,…
Abstract Poly(vinyl alcohol) (PVAL) samples partially functionalized with 4‐nitrophenyl carbonate groups were obtained by reaction of PVAL with 4‐nitrophenyl chloroformate using pyridine as a catalyst. 2‐Amino‐2‐deoxy‐ D ‐glucose (glucosamine) was virtually quantitatively bound to PVAL activated with 4‐nitrophenyl car…
Phase equilibria were established in the ternary system Mn-Y-Zr for an isothermal section at 800 degrees C by use of X-ray powder diffraction, light optical microscopy and quantitative EPMA. No ternary compounds were observed. Mutual solid solubilities among the binary phases were found to be generally less than simil…
Abstract It is well known that poly(pyromellitic dianhydride‐oxydianiline) (PMDA‐ODA), orders at curing temperature well below its Tg with chains oriented parallel to the film plane. Structure analysis using X‐ray scattering reveals two structural features: (a) The ordered structure range from biaxial‐nematic‐like to…
To determine whether paradoxic uptake of gadolinium-ethoxybenzyl-diethylenetriamine pentaacetic acid (Gd-EOB-DTPA) occurs only with highly differentiated hepatocellular carcinomas, quantitative image analysis was performed in 37 mice with 133 hepatocellular carcinomas. The results of lesion/ liver signal intensity mea…
Abstract N ‐Methylation of the peripherally highly substituted octaethyltetraphenylporphyrin ( 1 ) with either methyl iodide or methyl triflate gave the respective mono‐, di‐, tri‐ and tetra‐ N ‐methylated derivatives. Use of methyl triflate under carfully controlled conditions often gave the N ‐methylporphyrins in qu…