Materials Literature
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In this paper, ferroelectric PbTiO3 (PT) ultrafine powders with nanosized grains are prepared through sol-gel and hydrolysis-aging process. The lattice constants and grain size are determined by XRD analysis. The phase transition is examined by DSC and Second Harmonic Generation (SHG) measurements. The relation betwee…
The morphology of diamond films deposited in the substrate temperature range of 550° C to 750° C by microwave plasma enhanced chemical vapor deposition (MPECVD) has been investigated as a function of the nucleation density. Nucleation density can be controlled in the range of 1.5×10 7 to 1.0×10 10 nuclei/cm 2 by varyi…
PZT thin films have been prepared via a sol-gel route using standard butoxide and acetate precursors. The solution compositions were modified by the addition of acetylacetone in 2 methoxyethanol, which has the effect of changing the solution complex and therefore its deposition and drying characteristics. Varying amou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-Scattering Studies on Hydrogen-Bonded Polymer BlendsDorab E. Bhagwagar, Paul C. Painter, and Michael M. ColemanCite this: Macromolecules 1994, 27, 24, 7139–7145Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 No…
Abstract The effect of potassium aluminium sulphate, (hereafter referred to as alum) on the energy of pyrolysis/combustion of wood cellulose was investigated using thermogravimetric analysis (TGA). It was observed that the energy of pyrolysis of all the materials employed increases with flame retardant loading. Hence,…
3-Oxo-delta 5-steroid isomerase (KSI) catalyzes the isomerization of a variety of 3-oxo-delta 5-steroids to their conjugated delta 4-isomers through the formation of an intermediate dienol. Mutation of the catalytic base (Asp-38) to Glu (D38E) has been found to reduce kcat/Km for the isomerization of 5-androstene-3,-1…
Abstract Auger electron spectroscopy measurements have been performed on silicon nitride layers exposed to air. The layers were deposited on Si(100) wafers kept at 300°C or 600°C by excimer laser ablation of a silicon target under various ammonia pressures. The Si LVV, O KLL and N KLL lineshapes of silicon nitride lay…
Abstract A useful instrument for polymer film preparation by solution casting was employed in this study. It enabled us to control the solvent evaporation rate of the polymer solution. By using this instrument, the aggregation of hard segments in segmented poly(urethane‐urea) (SPUU) was investigated. SPUU was prepared…
This paper describes a novel rapid consolidation technique called Dynamic Magnetic Compaction (DMC) for consolidating advanced material powders. DMC utilizes pressures generated from pulsed electromagnetic fields to form net shape parts. The consolidation occurs rapidly in less than a millisecond via pressure wave pro…
Synthetic approaches for the preparation of macromolecular conjugates of the antifibrotic agent cis-4-hydroxy-L-proline (cHyp) were explored, and the efficacy of the conjugates in inhibiting collagen accumulation was investigated in vitro and in vivo. In one approach, poly(PEG-Lys), an alternating copolymer of poly(et…
A fusion enzyme consisting of UDP-galactose 4-epimerase and galactose-1-P uridylyltransferase with an intervening Ala3 linker was constructed by in-frame fusion of E. coli gene galT to the 3'-terminus of the E. coli gene galE that had been extended with the coding sequence for three alanine residues, all contained wit…
Tritium concentration measurements have been made of the tritium recovery from the JT-60U after high power neutral beam injected discharges. This work has been done to study tritium release characteristics and to assess the tritium inventory in the vacuum vessel. Cleanup operations by hydrogen divertor discharges and…
Fascicle II of the Americanarum Diatomarum Exsiccata is comprised of 52 diatom slides from 34 lakes, ponds, and streams located on Ellesmere Island in the Canadian High Arctic. This exsiccata has been distributed to 16 museums and collections around the world. Diatom slides were prepared from sediments, mosses, and pl…
Sintered densities of β‐silicon carbide compacts were observed to decrease as the thickness of the compact increased. The chemistry and density gradients of these compacts were analyzed, as well as the weight loss and the CO evolution during sintering. The sintering cycle was altered to include a vacuum hold between t…
Abstract The prepaparation of amorphous, homogeneous blends of zwitterionic polymers and transition metal salts was investigated. Homogeneous miscibility was achieved in many cases up to equimolar amounts of salt, depending on the anion and cation chosen. Various analytical techniques point to a solid state solution o…
The “supercell” scheme is applied to the study of local defects in MgO (Ca substitution, cation and anion vacancies) and bulk silicon (carbon substitution). The trend of the quantities of interest (defect formation energy, geometrical relaxation, charge distribution around the defect) as a function of the supercell si…
The magnetoelectricity of the boracite Cr3B7O13Cl has been studied by quasistatic and dynamic magnetoelectric (ME) H measurements on (001)cub platelets with a ferroelastic/ferroelectric single domain state, obtained by poling with an electric field of E = 45 kV·cm−1, applied upon cooling through the 42ml′ ⇒ mm21′ phas…
The plasticizer, n-butylbenzenesulfonamide (NBBS), is reported to be neurotoxic when inoculated intracisternally or intraperitoneally into rabbits. Because NBBS is commonly used in the production of polyamide (nylon) plastics and is soluble in water, the disposal of NBBS-containing plastics in landfill sites could res…
The diffusion of oxygen in commercially available aluminum nitride substrates has been studied by performing interdiffusion‐type experiments. The diffusion of oxygen both within AlN grains and along grain boundaries was investigated. By using as‐received AlN substrates and an electron microprobe as an analytical tool,…
Abstract An alcohol utilizing Alcaligenes eutrophus NCIMB 12080 produced a copolymer, poly‐(hydroxybutyrate–valerate) (PHBV), in a computer‐controlled 7‐L fed‐batch fermentor when the alcohol feed contained pentanol. Pentanol as a sole carbon source was not efficient either for cell growth or for PHBV production. To a…