Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh energy resolution x-ray photoelectron spectroscopy studies of tetracyanoquinodimethane charge transfer complexes with copper, nickel, and lithiumJohn M. Lindquist and John C. HemmingerCite this: Chem. Mater. 1989, 1, 1, 72–78Publication Date (Print):January 1, 1989Publi…
Transference numbers determined by the classical Hittorf method for liquid polymer electrolytes (solutions of NaSCN etc. in copolymers of ethylene and propylene oxide) yield consistently low values of t+(ca. 0.05). This points to a model in which cations are immobilised by interaction with the polymeric solvent and an…
Laser Raman microprobe examination in air of small-particle-sized (powders and whiskers) TiN, TiB 2 , TiC, WC, ZrN, and NbN revealed the formation of surface oxides, which were induced by laser heating. The rate of oxide formation varied with the particle size of the samples and the laser power density applied. The ox…
A vacancy relaxation model which predicts the DC lifetime, pulse DC lifetime, and AC lifetime for all waveforms and all frequencies above 10 kHz is proposed. The AC lifetimes of aluminum interconnect are experimentally found to be more than 10/sup 3/ times larger than DC lifetime at the same current density. AC stress…
A large number of herbal drugs are used in the traditional medicine of Saudi Arabia for the treatment of rheumatism, arthritis, gout and other forms of inflammation. In the present study seven of these crude drugs, namely Francoeuria crispa, Hammada elegans, Malus pumila, Ruta chalepensis, Smilax sarsaparilla, Achille…
A chemical examination of the leaves of Mallotus repandus (WILLD.) MUELLER-ARG. (Euphorbiaceae) has led to the isolation of four new hydrolyzable tannins, named repandusinin (10), repandusinic acids A (11a) and B (14a) (as monopotassium salts) and mallotinin (15), together with glucogallin (1), eugeniin (2), corilagin…
Plasmids containing (dG)27.(dC)27 inserts (pPG27), (dG)37.(dC)37 inserts (pPG37), and (dG)24C(dG)21.(dC)24G(dC)21 inserts (pPG46C) were constructed for the study of structural transitions within (dG)n.(dC)n stretches. Two-dimensional gel electrophoresis has shown that a Mg2+-dependent supercoiling-induced structural t…
Abstract Gelatinization temperatures of starch and hydroxyethyl starch was determined using Differential Scanning Calorimetry (DSC), hot stage microscopy and viscography. The gelatinization temperature based on peak temperature of DSC is incorrect. Viscograph overestimates the gelatinization temperature. Hot stage mic…
The effects of hydride morphology on the axial fracture toughness of cold-worked Zr-2.5Nb pressure tube material have been determined between room temperature and 240°C. Tests were performed on small compact tension specimens machined from samples of material prepared with different morphologies and hydrogen concentra…
Abstract A concept of effective surface area was defined as a geometrical controlling factor for a chemical reaction involving powdery materials. It is not uniquely determined for the specific material but depends on the sort of chemical reaction as well as the state of agglomeration. Case studies were given for disso…
Reaction of europium(III) with p-t-butylcalix[4]arene (H4L) under the same conditions as used for reactions with larger calixarenes yields a yellow crystalline complex structurally characterised as [Eu2(HL)2(dmf)4].7dmf, where dmf =N,N-dimethylformamide. The crystals are monoclinic, space group C2/c with a= 35.03(2),…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrasonic irradiation of copper powderKenneth S. Suslick, Dominick J. Casadonte, and Stephen J. DoktyczCite this: Chem. Mater. 1989, 1, 1, 6–8Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 January 1989https://pubs.a…
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The mechanisms of moisture absorption by an insulator surface contaminated with different salts is described. A list of some salts depending on their hygroscopicity is given. Measurements of surface conductivity and leakage current on flat insulator models at different relative humidities and with different types of s…
Abstract The effect of polymeric molecular weight and molecular weight distribution on pressure‐sensitive adhesive performance was studied in a model system of commercial polyisobutylenes. Molecular weight was characterized by size exclusion chromatography and membrane osmometry. Pressure sensitive adhesive performanc…
First, a brief overview is given on literature dealing with purification, purity assessment, and crystal growth methods which are applicable to organic photoconductors and semiconductors under the aspect of the required high purity. Then some recent examples are presented of purification, material handling and crystal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of high-resolution electron microscopy in the identification and characterization of new crystalline, microporous materials: "reading off" the structure and symmetry elements of pentasil molecular sievesOsamu Terasaki, John M. Thomas, G. Robert Millward, and D. Watanabe…
Abstract A novel high temperature thermosetting resin system based on the addition polymerization of bis (4‐maleimidophenyl)methane and o, o′‐diallyl‐bisphenol A is presented in this paper. This system offers the combination of easy solventless processing and the high temperature and toughness performance characterist…
A tight binding model on the general 1D quasiperiodic chain is studied in the framework of perturbation theory, near the corresponding periodic chain, using a new set of coordinates. The main gaps are well described, whereas the very small ones are correctly given, only for a very small perturbation. For a given irrat…
The results of flashover tests on insulator models with various geometrical configurations under DC field are presented. Dimensional parameters are used to describe the influence of the insulator profile on the flashover performance. The effects of both the surface contamination level and the geometrical shape on the…