Materials Literature
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In the solid-state reaction between ultrafine chromia powder, which was produced by the decomposition of chromium formate, and amorphous boron powder, Cr5B3, CrB, Cr3B4, Cr2B3 and CrB2 were obtained at the mole ratios of 1.5 to 7.0 at 1600°C in vacuum for 2h. A single phase of CrB was formed at the mole ratio of 3.0 a…
A machinability of porous Si3N4 ceramics composed of columnar β-Si3N4 grains was evaluated by turning and milling with cemented carbide cutting tools to investigate a possibility of application of the porous Si3N4 to machinable ceramic use. The porosity and the flexural strength of specimens were about 43% and 270MPa,…
Key to the dynamics of the type of bubble collapse which is associated with such phenomena as sonoluminesence, and the emission of strong rebound pressures into the liquid, is the role of the liquid inertia. Following the initial formulation of the collapse of an empty spherical cavity, such collapses have been termed…
There are many classes of compounds which are useful as flame retardants. Inorganic minerals, organo-phosphates, and halogenated compounds are all commonly used for their ability to inhibit combustion and smoke generation in plastics and other materials. In 1993, United States industries consumed 810 million pounds of…
A mineralogical and microstructural study of bentonites from ‘Cerro del Aguila’ located in the Tagus Basin (Toledo, Spain) was carried out using XRD, SEM and TEM observations and chemical data obtained by TEM-EDX. The bentonites are mainly composed of trioctahedral smectite with a unit-cell formula (Si3.76Al0.24)(Al0.…
We devised a simple and quick technique for establishing axenic cultures of the centric diatom Coscinodiscus wailesii Gran by washing the cells with a sieve and soaking them in antibiotic media.
Reactions of FeIII(NO3)3·9H2O with 0.5 equivalent of 2-hydroxypropane-1,3-diamine-N,N,N′,N′-tetraacetic acid (H5dhpta) and an excess of amino acid [glycine (Gly) or L-alanine (L-Ala)] in water with the pH adjusted to ca. 5 by a solution of NaOH gave pale green crystals formulated as Na[Fe4(dhpta)2(µ-O)(µ-OH)(O2CCHRNH3…
Novel trinuclear copper(I) halide complexes with 2,5-bis[(diphenylphosphino)methyl]thiophene (dpmt), [Cu3(µ3-X)(µ-X)2(µ-dpmt)2] (X = I 1, Br 2 or Cl 3), have been synthesized and structurally characterised. They have unusual three-runged ladder structures with one triple-bridging and two double-bridging halide atoms.…
Adsorption and desorption behavior of bovine serum albumin (BSA) and gelatin on the surface of stainless steel particles are studied. The amount of BSA adsorbed increases significantly with temperature above 60°C whereas that of gelatin decreases slightly with increasing temperature. Results of adsorption experiments…
Phase relations and reoxidation behaviour is reported for samples with nominal composition La4Co3O10–δ(0.00≤delta;≤1.00) synthesized by isothermal reduction at 673 K. The crystal structure of La4Co3O9 has been determined on the basis of high-resolution powder X-ray diffraction and neutron diffraction data. The space g…
The effect of molding temperature and time on the electrical conductivity of Vapor Grown Carbon Fiber (VGCF) filled High Density Polyethylene (HDPE)/Poly(methylmethacrylate) (PMMA) blends has been investigated. The dispersion state of short carbon fibers in polymeric matrix is affected not only by the volume fraction…
An experimental and theoretical study of the degassing behavior of a poly(ethylene) high-density foam, during storage at laboratory conditions, is presented. This foam is an expanded form of a low-density poly(ethylene), which is produced from its melt, using high-pressure nitrogen gas as the blowing agent, and is the…
A general methodology has been established for the synthesis of 40–120 Å Cu nanoclusters within the morphologies of [MTD]400[NORCOOH]50 and [MTD]400[NORCOONa]50 diblock copolymer films. In this technique the films are soaked in aqueous copper(II) acetate solutions prior to reduction of the sequestered Cu2+ ions. A loa…
The classical Blech description of the electromigration—stress interplay in interconnects treats the maximum electromigration compressive stress as a material constant (the yield stress). Systematic drift velocity and hillock topography observations in bare Al, anodized Al, and Cu conductors show this description to b…
The diamine monomer bis(m-aminophenyl) methyl phosphine oxide (DAMPO) was synthesized via nitration and reduction of diphenyl methyl phosphine oxide. Rigorous purification of this monomer enabled its utilization in the synthesis of high molecular weight poly(ether imide)s. Both thermoplastic materials and thermosettin…
Diffusion induced recrystallization (DIR) in the Ni(Cu) system was experimentally studied. The notation Ni(Cu) means that Cu atoms diffuse into a pure Ni or binary Ni–Cu phase. The Cu/Ni/Cu diffusion couples consisting of pure Cu single crystals with the same crystallographic orientation and a pure Ni polycrystalline…
Silver(I) is employed to dope poly(3-alkylthiophenes) (P3ATs) and other conjugated polymers. Solutions containing silver(I) salts and P3ATs, which usually undergo spontaneous reaction, doping, and precipitation, were stabilized using coordinating ligands that modify the reduction potential of the Ag(I) species. Upon r…
Nonstochiometric mixed oxides are often of interest for their novel catalytic or material properties yet are often difficult to synthesize in easily characterizable forms. We report on the use of low-temperature epitaxy of Ca and Mg under oxidizing conditions to yield mixed thin film oxides. Low-energy electron diffra…
The development of high-temperature titanium alloys has been dominated by the requirements of aerospace industries. Initially, improvements in tensile strength and creep properties were the main interest. Gas inlet temperatures in aero-engines have increased continuously and, nowadays certain components in gas turbine…
The TiB2-ZrB2 ceramic system, which has a range of high hardnesses and electrical conductivities, was sintered by the hot-pressing method from mixed powders of TiB2 and ZrB2. The mixed powders calcined at 1450°C for 5.4ks with compositions from 100mol% TiB2 to 100mol% ZrB2 (20mol% step) were preformed at a pressure of…