Materials Literature
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SUMMARY This work aims to clarify the problem of why the ultimate resolution assessed experimentally from the observation of 0.8 nm separation of Au‐Pd fine particles is beyond the theoretical resolution limit of scanning electron microscopy (SEM). The correlation between the spatial distribution of secondary electron…
Abstract A method of obtaining modified amine curing agents containing β‐hydroxyurethane linkages is presented. The basic physical and chemical properties of the modified polyamines, such as viscosity and reactivity towards epoxy resins, have been studied. A shortening of the gel and curing times in addition to a decr…
The wide-angle X-ray diffraction patterns of carbon fibres are strongly modulated by disorder in the stacking of carbon layers, preferred orientation and the measuring conditions. A method has been developed to characterize the crystallites in carbon fibres by applying the theory on the wide-angle X-ray diffraction of…
Abstract The preparation and properties of highly crystalline ionomers formed by the copolymerization of propylene and low levels of ethylcholoroaluminium 10‐undecenoate have been investigated. Few of the variables studied had dramatic effects on the copolymerization. Thus, a five‐fold increase in undecenoate concentr…
Work on charge storage processes in dielectrics performed over the past few years is reviewed. Results obtained on polymers with corona, electron-beam, and pressure-pulse methods and pertaining to trap filling, spatial distribution of the charge, radiation-induced conductivity, and dynamics of the charge decay are dis…
In 0.5[xPZ-(1-x)PT]-0.5[yPZN-(1-y)PNN] system ceramics, the dielectric and piezoelectric properties, the temperature and electric field dependences have been studied as a function of PT and PZN content. In both calcined powders and fired samples with the addition of columbite precursor materials, a presence of the pyr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical versus thermal electron transfer between iridium(I) maleonitriledithiolate complexes and methyl viologenElise Graham Megehee, Curtis E. Johnson, and Richard EisenbergCite this: Inorg. Chem. 1989, 28, 12, 2423–2431Publication Date (Print):June 1, 1989Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of nickel picket fence porphyrin. Electrogeneration and spectral characterization of nickel complexes in unusual oxidation statesK. M. Kadish, D. Sazou, G. B. Maiya, B. C. Han, Y. M. Liu, A. Saoiabi, M. Ferhat, and R. GuilardCite this: Inorg. Chem. 1989, 28,…
A new indole alkaloid glucoside, named palicoside, has been isolated from the leaves of PALICOUREA MARCGRAVII (Rubiaceae) collected in Brazil. The structure was established by spectroscopic methods and its chemical conversion to strictosamide.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolythioamide and poly(1,3,4-thiadiazole) synthesis from dimethyl tetrathioterephthalateIsabelle Delfanne and Guy LevesqueCite this: Macromolecules 1989, 22, 6, 2589–2592Publication Date (Print):June 1, 1989Publication History Published online1 May 2002Published inissue 1 Ju…
Compared with wood pulp cellulose, alkaline H2O2-treated wheat straw [suitable for incorporation into baked foods, to reduce caloric density and increase dietary fibre levels] becomes more extensively hydrated, increases more in size when hydrated, and contains a larger glucose accessible internal vol. These and other…
Three different binuclear phthalocyanines were prepared and characterized. Two of the binuclear phthalocyanines are cofacially linked by rigid naphthalene and anthracene spacers, while the third consists of a direct linkage between two phthalocyanine rings. The dicobalt, dicopper, and dizinc derivatives were prepared…
The adsorption of CO2 on clean silver films, oxygen treated silver films and alkali metal predosed silver films has been studied with surface enhanced Raman spectroscopy (SERS) and work function measurements. At 50 K, CO2 was observed to adsorb on vapor deposited silver films with downward vibrational frequency shifts…
The reaction of horseradish peroxidase with alkylhydrazines results in delta-meso-alkylation of the prosthetic heme group and enzyme inactivation (Ator, M. A., David, S. K., and Ortiz de Montellano, P. R. (1987) J. Biol. Chem. 262, 14954-14960). As reported here, enzyme inactivation is associated with the accumulation…
Tri-allylthiourea cadmium chloride (ATCC), an organometallic complex, is a new nonlinear optical material with high second harmonic generation (SHG) effect. Transparant single crystal of 30 × 30 × 25 mm has been grown. Comprehensive studies of crystal growth, structure and general properties have been carried out. The…
Abstract Very good agreement between the observed and the calculated intensities was obtained using the Pearson VII profile shape function. The variable exponent m could be refined only in the damped iterations involving exclusively the profile parameters. Simultaneous refinement of the m with the positional and/or th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVitrified dilute aqueous solutions. 3. Plasticization of water's hydrogen-bonded network and the glass transition temperature's minimumKlaus Hofer, Andreas Hallbrucker, Erwin Mayer, and G. P. JohariCite this: J. Phys. Chem. 1989, 93, 11, 4674–4677Publication Date (Print):Jun…
Grain orientation effects of (NaBi)(l-x)/2Ca x Bi4Ti4O15 (NCBT-100x) ceramics, which belong to a bismuth layer-structured ferroelectric (BLSF) family, are studied using the hot-forging (H.F.) method on the piezoelectric and pyroelectric properties. The dielectric constant ε s is small and almost constant at the wide r…
Abstract Siliconpolymere werden heute weit verbreitet dort eingesetzt, wo hohe Anforderungen an Werkstoffe gestellt werden. Ihr Eigenschaftsprofil – hohe Lebensdauer und große thermische Beständigkeit – hat eine Produktpalette entstehen lassen, die von Ölen über Elastomere bis zu Harzen reicht. Charakteristisches Merk…
Abstract This paper compares the texture of palygorskite after acid leaching with that of the product after extraction silica is removed. These effects were evaluated on the basis of nitrogen adsorption-desorption and mercury penetration porosimetry. Acid leaching at reflux temperature with 2 N HCl resulted in an incr…