Materials Literature
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The dependence of macropore morphology on the orientation of p- and n-type silicon samples was studied for various organic and aqueous electrolytes containing hydrofluoric acid. Scanning electron microscopy was used studying the morphology of the macropores. The results show that the macropore formation in p- and n-ty…
The structure of a crystalline form of Bombyx mori silk fibroin, commonly found before the spinning process (known as silk I), has been proposed as a repeated beta-turn type II-like structure by combining data obtained from solid-state two dimensional spin-diffusion nuclear magnetic resonance and rotational-echo doubl…
Highly ordered hydrothermally stable SBA-15 mesoporous silica containing phosphonic acid groups are synthesised for the first time by using amphiphilic block copolymers as the structure-directing agents.
The syntheses, crystal structures, and physical properties of two new crystalline charge-transfer salts of BEDT-TTF, bis(ethylenedithio)tetrathiafulvalene, containing tris(oxalato)metallate(III) anions of 3d elements are reported. Electrochemical oxidation of BEDT-TTF in the presence of (NH4)3[Fe(C2O4)3]·3H2O or (NH4)…
Niobium(V) oxide (Nb2O5) powders were synthesized by the solvothermal reaction of niobium(V) pentabutoxide (NPB) in toluene at 573 K in the absence or presence of water. Nb2O5 powder with a large surface area (>200 m2 g−1) was obtained in the absence or presence of only a small amount of water. Its X-ray diffraction (…
Space charge is a recent hot topic in the field of electrical insulation, since it can be measured nondestructively as standard practice. It has been long suspected that space charge might be critically involved in local dielectric breakdown or tree initiation. It is widely accepted that space charge is formed under d…
The effect of solution pH on some characteristic properties, i.e. , thickness and ion content, of the surface oxide film on high purity aluminum exposed to NaCl solutions have been analyzed by X-ray photoelectron spectroscopy (XPS). The aluminum oxide film thickness is strongly dependent upon the solution pH. In the a…
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…