Materials Literature
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A new dielectric composite consisting of a polymer coated onto a high-density metallized Kraft has been developed for application in pulse power capacitors. The polymer coating is custom formulated for high dielectric constant and strength with minimum dielectric losses. The composite can be wound and processed using…
Tryptophan synthase is a classic enzyme that channels a metabolic intermediate, indole. The crystal structure of the tryptophan synthase alpha2beta2 complex from Salmonella typhimurium revealed for the first time the architecture of a multienzyme complex and the presence of an intramolecular tunnel. This remarkable hy…
Nanoporous platinum sponges, which exhibit characteristic X-ray diffraction patterns due to structural order on the mesoscale, have been obtained after removing the silica template with HF following synthesis within the pores of MCM-48 and SBA-15 with Pt(NH3)4(NO3)2.
Hederagenin, delta-hederin [hederagenin alpha-L-arabinoside], kalopanax-saponin A [hederagenin 3-O-alpha-L-rhamnosyl(1-->2)-alpha-L- arabinoside], kalopanaxsaponin I [hederagenin 3-O-beta-D-xylosyl(1-->3)-alpha-L- rhamnosyl(1-->2)-alpha-L-arabinoside], and sapindoside C [hederagenin 3-O-beta-D-glucosyl(1-->4)-beta-D-x…
Atomistic computer modelling methods are used to investigate the effect of the strong magnesium–water interaction on the crystal growth of dolomite MgCa(CO3)2. We find that the main dolomite cleavage plane under aqueous conditions is less stable than its counterparts in either pure calcite CaCO3 or magnesite MgCO3. Mo…
The photophysical properties of tetra-tert-butylphthalocyaninatosilicon (SiPc) covalently linked to one or two 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) radicals (R1, R2) have been studied by fluorescence, transient absorption, and time-resolved electron paramagnetic resonance (TREPR) spectroscopies. It is found th…
The effects on the electrical conductivity and the crystalline structure of the addition of and to with 11 mol % (11ScSZ) have been examined. 11ScSZ has the rhombohedral structure and is transformed to cubic structure at 580°C. The cubic phase was stabilized at room temperature by the addition of about 6 mol % and 2 m…
We present a micromachined 10/spl times/10 array of thermoelectric infrared sensors fabricated in a commercial complementary metal-oxide-semiconductor (CMOS) integrated circuit process with subsequent bulk-micromachining on wafer-scale. This array is used to demonstrate the feasibility of a low-cost thermal imager. Th…
The nature of the surface rhenium oxide species present in supported rhenium oxide catalysts was determined as a function of the oxide support, rhenium oxide loading and secondary metal oxide additives. The catalysts were prepared using the incipient wetness impregnation method with dilute aqueous perrhenic acid as th…
Materials for energy sources, such as rechargeable batteries and fuel cells, are functional materials. Their development presents special challenges since they are designed for more than one function and must satisfy multiple and mostly interlocking requirements. A unique combination of properties is achievable in com…
In this paper the effects of temperature on partial discharge (PD) activity taking place inside a spherical void in epoxy resin system are studied. Indeed, some experimental tests previously performed on specimens, having different void shapes, under multi-stress condition of temperature and voltage, have shown very d…
The dipyrromethane + aldehyde condensation is a common method for the synthesis of trans-A2B2-porphyrins, but is often plagued by scrambling processes that lead to a mixture of porphyrins. The problem of scrambling is more pronounced with unhindered dipyrromethanes (e.g., 5-phenyldipyrromethane) than with hindered dip…
The decomposition of benzene was carried out using a plasma reactor packed with a mixture of BaTiO/sub 3/ and zeolite pellets, the zeolite-hybrid reactor. The reactor performance was characterized by measuring CO/sub x/ formed during plasma discharge and CO/sub x/ adsorbed on the solid surface, The decomposition effic…
Electrodes made by depositing ruthenium oxide on conducting poly(3,4-ethylenedioxythiophene) (PEDT) were studied for their electrochemical and impedance properties. In acidic electrolytes the composite electrodes exhibited large capacitance due to contributions from the double-layer capacitance and the faradaic capaci…
Bidimensional hexagonal or centred-rectangular mesoporous zirconia thin films have been reproducibly prepared by evaporation-induced self-assembly (EISA), which are stable up to 300 degrees C, with pore size around 35 A; the films can be post-functionalised with organic ligands presenting different functions, opening…
Successive reactions of gaseous trimethylaluminium (TMA) and ammonia on porous alumina were studied with the goal of finding suitable process conditions for preparing aluminium nitride (AlN) by atomic layer deposition (ALD), a technique based on separate saturating gas–solid reactions. The reaction of TMA was studied…
Abstract A fractional factorial experimental design was used to investigate relative effects of operating conditions on the filtration resistance of a slurry produced in a pharmaceutical semicontinuous batch crystallizer. The six operating variables were seed type, seed amount, temperature, solvent ratio, addition tim…
The aliphatic polyesters with high molecular weight have been prepared according to two methods. First is the synthesis of the polyesters by polycondensation of dimethyl succinate (DMS) with 1,4-butanediol (BD) using various metal alkoxides as a catalyst. Among the metal alkoxides used, titanium tetraisopropoxide [Ti(…
Silicon dioxide glass rods of micrometer sizes were synthesized by using surfactant–carbon nanotube co-micelles as templates. These glass rods were used as additives to reinforce inorganic ceramics. The mechanical strength of the silicon dioxide ceramic is enhanced by ∼100% in the presence of ∼6 wt% of CNTs.
Advanced finite element techniques for the simulation of materials behavior under mechanical loading are reviewed. Advantages, limitations and perspectives of different approaches are analyzed for the simulation of deformation, damage and fracture of materials taking into account their micro- and mesostructure. Develo…