Materials Literature
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The effects of surface orientation on dissolution rate of type 310S and Alloy 600 single crystals were investigated by potentiostatic etching in the active region in H2SO4–NaCl solution. (100) and (111) planes were prepared by cutting at the given angles of single crystals. The dissolution rate changed with etching po…
In order to evaluate the thermal conductivity of oxidized fuel pellets of leaker fuel rods, UO2+x samples with x between 0.00 and 0.20 were prepared by an oxidation or a sintering method. Sample thermal diffusivities were measured by using a laser flash method from 300 to 1,400 K and their thermal conductivities were…
P. T. Gallagher, Contemp. Org. Synth., 1996, 3, 433 DOI: 10.1039/CO9960300433
A method is presented for the preparation of stable model dispersions of paramagnetic silica particles. A specially designed silane coupling agent containing Ni 2+ ions is grafted onto silica particles which are either commercially obtained or prepared by the Stöber synthesis. A wet process is described which avoids a…
BACKGROUND: To develop a new green approach for biosynthesis of silver nanoparticles, myconanotechnology has been represented as a novel field of study in nanotechnology. In this study, we have reported the extracellular synthesis of highly stable silver nanoparticles using three species of dermatophytes: Trichophyton…
Crystals of 2,4,6-trinitrotoluene (TNT) have been grown from a wide range of organic solvents under various conditions. The structural nature and morphology of these crystals were systematically characterised using a number of techniques. The crystals were found to exist in two basic forms having monoclinic and orthor…
This paper presents the main kinetic parameters for aluminothermic reduction of MnO2 and Fe2O3. Aluminothermic reduction which in fact is a redox reaction requires an initial input of heat which is obtained through external reaction and/or oxidation of aluminium. In a system where oxidation as well as reduction take p…
Four new Co complexes are reported which illustrate routes to high nuclearity species; these include a dodecanuclear ‘chain of cubes’ and a tridecanuclear species which features a tetranucleating phthalate ligand.
The main structural component in collagen is the triple helix which is generally composed of the amino acid sequence repeat (X-Y-Gly)n with proline and hydroxyproline often present at positions X and Y. Non-globular, fibrillar proteins like most collagens are difficult to work with from a structural perspective. An al…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStereochemical Control in Metalloporphyrin Chemistry: Synthesis and Characterization of cis- and trans-Sn(porphyrin)Ph2Denisha Y. Dawson, Joan C. Sangalang, and John ArnoldView Author Information Department of Chemistry, University of California Berkeley, California 94…
Either portland cement or magnesium oxychloride cement was used as binders for concretes that incorporated fine rubber aggregate, ranging from 0 to 25 percent by volume. The concretes were tested for their compressive and split tensile strengths to determine whether the use of a magnesium oxychloride cement along with…
Abstract The crystal structure of cubic Al 68 Pd 20 Ru 12 was investigated by means of single crystal X-ray structure analysis: space group P 23 (No. 195), a = 15.540(2) Å, V = 3753(1) Å 3 , Pearson symbol cP 296–46.85. The chemical composition was determined by microprobe analysis: Al 68 Pd 20 Ru 12 , M r = 6316, Z =…
Melt crystallization processes are predominantly used to separate and purify substances or to concentrate compounds. The thermal unit operation is based on a different equilibrium composition of a substance in a different stage of aggregation. Background information about the theory of melt crystallization can be foun…
In the second part of this series the influence of monomer concentration on the chemical structure and the shape and size of poly(aryl ether ketone ether ketone ketone) (PEKEKK) particles was reported. The present study of the thermal behavior and microstructure of aromatic polyketone samples in the form of particles…
An initial study has been made of radiation-induced oxidation of polypropylene (PP) in both its additive-free form and one containing discrete amounts of stabilizer (HALS). Samples of PP were irradiated in a /sup 60/Co /spl gamma/ source to various doses. This took place in either room air to give in-source oxidation…
Two new test methods, monotonic creep and micro-hardness, are used to study the environmental stress crack (ESC) resistance of polymethyl methacrylate (PMMA) and unplasticised polyvinyl chloride (UPVC). Monotonic creep is shown to discriminate, to a high resolution and in the short term, the ESC resistance of polymer/…
Two new compounds [Co(η-C5H5)2][Ni(C3S5)2]3·2MeCN and [Ni(η-C5H5)(C3S5)], both obtained by combination of the nickel complex anion [Ni(C3S5)2]–(C3S5= 4,5-disulfanyl-1,3-dithiole-2-thionate) and the metallocenium cation [M(η-C5H5)2]+(M = Co or Ni), respectively, have been prepared and characterized crystallographically…
Low-temperature single-crystal pulsed neutron diffraction is used to determine accurate positions and thermal parameters for all 33 atoms of the ibuprofen molecule, and the data used to predict the crystal morphology.
Cadmium telluride nanoclusters were prepared by vapor-phase deposition of elemental tellurium in Na + −zeolite A, followed by partial exchange of the zeolite with aqueous Cd(NO 3 ) 2, and reduction with hydrogen at 450 °C. The stability of the nanoclusters in environments that normally cause rapid Ostwald ripening or…
Abstract The melt viscosity of filled polymers depends on the filler particle packing. It is shown that the maximum particle packing for a low density polyethylene, filled with calcium carbonate, depends strongly on the filler surface treatment. This packing can be evaluated from melt viscosity measurements using the…