Materials Literature
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The kinetics of the epoxidation of soybean oil and the extent of side reactions were studied at 40, 60, and 80 °C. Epoxidation was carried out in toluene with “in situ” formed peroxoacetic and peroxoformic acid and in the presence of an ion exchange resin as the catalyst. The reaction was found to be first-order with…
Hydrotalcite was synthesized by a homogeneous precipitation method utilizing urea hydrolysis. When the homogeneous aqueous solutions containing magnesium chloride, aluminum chloride, and urea were heated, hydrotalcite particles were obtained. Scanning electron micrographs revealed that the products were well-defined h…
Rare‐earth‐doped oxynitride or nitride compounds have been reported to be luminescent and may then serve as new phosphors with good thermal and chemical stabilities. In this work, we report the photoluminescence (PL) spectra of europium‐, terbium‐, and praseodymium‐doped Ca‐α‐SiAlON ceramics. The highly dense ceramics…
Author: Douglas B. Murphy Bibliographic Data: John Wiley & Sons, Inc., 2001. ISBN: 0-471-25391-X, NLM: QH 211, 368 pp, hard cover, $79.95. Reviewer's Expert Opinion: Description: This book on the use of the light microscope introduces all of its classical and modern techniques and applications. It provides thorough th…
Abstract The use of in situ Raman spectroscopy to study the molecular structures of supported metal oxide catalysts under different environments is reviewed. The molecular structures under ambient (hydrated) and dehydrated conditions are presented. The effect of moisture at elevated temperatures is also presented and…
Stereoselective polymerization of racemic lactide (rac-LA) was examined using Al-achiral ligand complexes. By introduction of substituents in aromatic rings of Schiff base ligands, a higher selectivity was obtained without any chiral auxiliaries in the catalyst via a chain-end control mechanism. The T(m) values (T(m)…
The difference in the local environment of CO 3 2- , NO 3 - , SO 4 2- , and ClO 4 - in Mg/Al-hydrotalcite compared to the free anions was studied by infrared and Raman spectroscopy. In comparison to free CO 3 2- a shift toward lower wavenumbers was observed. A band around 3000-3200 cm -1 has been attributed to the bri…
DL_POLY is a general-purpose molecular dynamics simulation package, which was developed by Daresbury Laboratory in the mid-1990s for the molecular simulation community in the United Kingdom. The package now has a world-wide user base and applications in many areas of molecular simulation. In this article we briefly re…
Carbon nanotubes were grown directly on carbon fibers using chemical vapor deposition. When embedded in a polymer matrix, the change in length scale of carbon nanotubes relative to carbon fibers results in a multiscale composite, where individual carbon fibers are surrounded by a sheath of nanocomposite reinforcement.…
Despite the extraordinary promise of single-wall carbon nanotubes, their realistic application in materials and devices has been hindered by processing and manipulation difficulties. Now that this unique material is readily available in near kilogram quantities (albeit still at high cost), research into means of chemi…
The effect of H and Cl on the interfacial silicon emission has been investigated by the simulation of dry oxidation with the addition of small amounts (≤ 10%) of water (H 2 O) and chlorine (Cl 2 ). The simulation results for the oxide thickness indicate that the interfacial silicon emission rate is decreased and the e…
Recent reports of C(60)-functionalized metal tips [Kelly, K. F., Sarkar, D., Hale, G. D., Oldenburg, S. J. & Halas, N. J. (1996) Science 273, 1371-1373] and carbon nanotube tips [Dai, H., Hafner, J. H., Rinzler, A. G., Colbert, D. T. & Smalley, R. E. (1996) Nature (London) 384, 147-151] demonstrate the potential of co…
Diamond field-effect transistors (FETs) operate in electrolyte solutions having a wide pH range of 1–13. The FETs have been fabricated using a p-type surface conductive layer, where the diamond surface is exposed directly to the electrolyte solutions. From the drain current-gate voltage ( I ds – V gs ) characteristics…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionElectrochemical and Electronic Absorption Spectroscopic Studies of Substituent Effects in Iron(IV) and Manganese(IV) Corroles. Do the Compounds Feature High-Valent Metal Centers or Noninnocent Corrole Ligands? Implicatio…
Due to complete carrier depletion and strong phonon confinement effects, the thermal conductivity and the heat capacity per unit volume of nanocrystalline porous silicon (nc-PS) are extremely low in comparison to those of single-crystalline silicon (c-Si). Utilizing this great difference in the thermal property betwee…
The first isolable salt of the thiophene radical cation was prepared from the derivative annelated with two bicyclo[2.2.2]octene units, and its reaction with triplet oxygen was found to give a novel cation of a proton-chelating 2-butene-1,4-dione derivative with remarkable stability.
Nanoscale layered tetratitanate K2Ti4O9 powders were prepared at relatively low temperature by a stearic acid method. The structures of the titanates and the products which had undergone H+, Ag+ exchange and intercalated by propylamine and NH2(CH2)3Si(OC2H5)3 (APS) were investigated by XRD, TEM, TG and BET analysis. C…
The RF device potential of surface-channel polycrystalline diamond metal-insulator-semiconductor field-effect transistors (MISFETs) is demonstrated for the first time. Utilizing a self-aligned gate field-effect transistor (FET) fabrication process, effective transconductance of 70 mS/mm is realized at 0.7 µm gate leng…
The structural configuration of polyaniline in β-cyclodextrins (β-CDs) has been investigated by the two-layered own N-layered integrated molecular orbital and molecular mechanics (ONIOM) method, which includes both quantum mechanics and molecular mechanics calculations. It has been found that the configuration of poly…
A novel method of ferroelectric capacitor formation for Ferroelectrie random access memory (FeRAM) embedded LSIs and one-transistor-type FeRAMs has been developed. Amorphous Pb(Ti, Zr)O 3 (PZT) films were successfully transformed to the perovskite phase by a flash lamp technique with a crystallization time of 1.2 ms a…