Materials Literature
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Low temperature optical spectra of semiconductor microcrystals grown in a glass matrix demonstrate the effect of size quantization of the energy spectrum of Coulomb interacting electron-hole pairs. The phenomena and microscopic mechanism of ionization of microcrystals under optical excitation are regarded.
—When K. L. Mittal asked me to provide a historical account of the applications of silane coupling agents in adhesion, I decided to write in the form of a personal account of my last 45 years in this line of study. No attempt is made to make the history comprehensive, or to recognize the host of other researchers who…
X-ray photoelectron spectroscopy (ESCA), wettability measurements, and an ink adhesion test were used to characterize changes in the surface properties of air-corona-treated polypropylene (PP) films upon aging under a variety of storage conditions. No changes in ESCA O/C atomic ratios as a function of aging were obser…
The relation between deformation mode and β phase stability was investigated using Ti-16V and Ti-7Cr base alloys doped with Sn, Zr and Al as ternary or quaternary additions. Sn and Al additions change the dominant deformation mode from (332) twinning in the binary alloys to deformation induced martensitic transformati…
Functionally Gradient Materials (FGMs) characterized by the material having continuously varying material property from one surface to the other, have been prepared using gas, liquid or solid as starting material via several methods such as CVD, PVD, ion plating, plasma spraying, sintering or self-propagating high tem…
High-luminance green emission has been achieved from an electroluminescent (EL) device consisting of a Zn 2 SiO 4 :Mn thin-film phosphor and a thick BaTiO 3 ceramic insulator. The EL characteristics are strongly dependent on the preparation conditions of the Zn 2 SiO 4 :Mn thin film deposited by rf magnetron sputterin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange coupling and resonance delocalization in reduced iron-sulfur [Fe4S4]+ and iron-selenium [Fe4Se4]+ clusters. 1. Basic theory of spin-state energies and EPR and hyperfine propertiesLouis NoodlemanCite this: Inorg. Chem. 1991, 30, 2, 246–256Publication Date (Print):Jan…
Silicon oxynitride ceramics were prepared by hot‐pressing an equimolar Si 3 N 4 + SiO 2 mixture with 3 mol% CeO 2 . The Ce 2 O 3 /SiO 2 ratio of intergranular phase (liquid phase) increased as the formation of Si 2 N 2 O proceeded. The intergranular liquid remained as a glass on cooling until the Ce 2 O 3 /SiO 2 ratio…
Abstract
An original method of analyzing the foam-active compounds in Champagne base wine was used, by extraction of a foam wine; after the collection of foam (by constant artificial effervescence), which collapsed into a foam wine, we analyzed the latter comparatively with the remainder wine (which remained after the extracti…
Changes in the crystallinity and polymorph of chitosan, which may affect its functionality, by heating (up to 200°C) its water suspension were studied by X-ray diffraction measurements, using tendon chitosan prepared by N-deacetylation of a crab tendon chitin, and chitosan powders with various degrees of polymerizatio…
The mixed-valence states in Cs2AuIAuIIIX6(X = Cl, Br or I) were systematically studied by X-ray photoelectron spectroscopy of the Au 4f region for the first time. The gold valence states in halogeno complexes of AuI and AuIII were also studied. In Cs2Au2X6 the difference between the oxidation state of AuI and that of…
Theoretical and experimental analyses are presented of the electromagnetic transient following the out-of-phase synchronization of a three-phase five-limb step-up transformer; this means an abnormal condition where the angle between phasors representing the generated voltages and those representing the power network v…
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Several thermally conductive ceramics in combination with different polymer matrices have been examined. The interdependence of thermal conductivity with other key properties of the polymer composites are discussed. Selection of the filler and the resultant filler content in semiconductor grade molding compound are di…
A transmission electron microscope study of carbonate apatite crystals isolated from bone and mineralizing tendon, as well as those produced synthetically under approximated-physiological conditions, shows that they are thin irregular shaped plates. Electron diffraction patterns of individual crystals confirm that the…
[4′-(Dimethylamino)biphenyl-4-yl]dimesitylborane (BNB) and [4′-(dimethylamino)phenylazophenyl-4-yl]dimesitylborane (BNA) have been prepared and studied by a solvatochromic technique. The high second-order hyperpolarisability coefficients βCT determined by this technique, 37 and 240 × 10–30 esu, respectively, show that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGraft copolymer compatibilizers for blends of polypropylene and ethylene-propylene copolymersDavid J. Lohse, Sudhin Datta, and Edward N. KresgeCite this: Macromolecules 1991, 24, 2, 561–566Publication Date (Print):January 1, 1991Publication History Published online1 May 2002…
VPI-7: the first microporous zincosilicate to contain 3-membered rings (3MR) is reported.
Infrared spectroscopy has been used to analyse the gas-phase reaction products, and the related adsorbed species, obtained from the decomposition of methanol over TiO2, ZrO2 or HfO2 catalysts after consecutive 10 min heating periods at 50 °C intervals between room temperature and 400 °C. Somewhat different results wer…