Materials Literature
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We have developed a one-step, hydrofluoric acid-free hydrothermal etching method that not only produces bismuth nano/micrometer-sized spheres but also prepares porous silicon with vertical holes. By controlling the heating temperature and time, nanoscale vertical-channeled porous silicon can be received. Our result in…
Abstract Based on hyperbranched polyglycerol (PG), a route to prepare particles with a novel topology was developed. The hydroxyls of PG were converted to trithiocarbonates, and the latter were used to mediate the surface graft polymerization of N,N ‐dimethylaminoethyl acrylate. The poly( N,N ‐dimethylaminoethyl acryl…
The thermal conductivity of yttria-stabilized zirconias has been determined numerically, by applying a nonequilibrium molecular dynamic calculation. Comparing random configurations and Monte Carlo configurations in which chemical correlations are taken into account, we have established that the short range order devel…
A half-metal has been defined as a material with propagating electron states at the Fermi energy only for one of the spin directions. But is it fully half-metallic, that is without electrons with opposite spin at that energy? We have studied the spin-conserving process of tunnelling between La 0.7 Sr 0.3 MnO 3 half-me…
We investigated a carbon nanotube (CNT) oscillator controlled by thermal gas expansion using classical molecular dynamics simulations. When the temperature rapidly increased, the force on the CNT oscillator induced by the thermal gas expansion rapidly increased and pushed out the CNT oscillator. As the CNT oscillator…
Anionic pentapeptides consisting of a string of four glutamic acid residues terminated by either tyrosine (Glu4Tyr) or tryptophan (Glu4Trp) were synthesized, and their aggregation properties in buffered (pH = 7.0) aqueous solutions were investigated using two different approaches. In the first approach, the effects of…
Abstract A positive‐working chemically amplified photosensitive polyimide (PSPI) developable with basic aqueous solutions was obtained from poly(amic acid ethoxymethylester) (PAAE) as a polyimide precursor and diphenyliodonium 5‐hydroxynaphthalene‐1‐sulfonate (DINS) as a photoacid generator. The norbornene‐end‐capped…
The catalytic core of Escherichia coli DNA polymerase III holoenzyme contains three subunits: alpha, epsilon, and theta. The alpha subunit contains the polymerase, and the epsilon subunit contains the exonucleolytic proofreading function. The small (8-kDa) theta subunit binds only to epsilon. Its function is not well…
The crystal structure of the title compound, disodium 1,2,3,4-tetraoxo-5-cyclohexene-5,6-diolate, 2Na+·C6O62−, is built up of alternating layers of hexagonally packed Na+ cations and rhodizonate dianions. The rhodizonate dianion has a slightly twisted conformation.
Este trabalho teve como objetivo avaliar as propriedades mecânicas de chapas de madeira aglomerada, confeccionados com resíduos de Pinus elliottii Engelm., resultantes do processamento mecânico da madeira. As chapas foram produzidas com dois tipos de resíduos, cavaco e maravalha, utilizados puros ou misturados. O ades…
Abstract A new recycling method was investigated in this work, in which polystyrene (PS) sub‐µm fibres were electrospun from recycled expanded polystyrene (EPS). The experimental results in this work show that fibres with diameters of around 500 nm were produced by the electrospinning method. The fibres were produced…
We demonstrated a two-input exclusive-OR (XOR) gate using a single-electron transistor with two similar side gates in single-wall carbon nanotubes. Coulomb peaks were adjusted to have a half phase difference by a high input voltage to one of the two gates. The output current was in a low level when the same voltages,…
This study investigated the interactions of hydrogen plasmas with ultralow-k porous SiCOH (pSiCOH) films and their dependency on the values of the original dielectric constant, porogen used for the preparation of films, and substrate temperature during the plasma treatment. pSiCOH films of similar dielectric constants…
The production capabilities for optical multilayer coatings were improved significantly in the last decade. So called "shift free" coatings have become a standard in the coating production. Direct optical monitoring plays a key role to improve the layer thickness accuracy and takes advantage of error compensation effe…
Obtaining and maintaining proper levels of iron are major challenges for most organisms (reviews may be found in references [2][1], [9][2], and [10][3]). The redox features that make iron such a versatile and valuable cofactor can also lead to formation of extremely toxic and highly reactive oxygen
PURPOSE: To examine and compare properties of high-molarity contrast agent gadobutrol (Gadovist) and weakly protein-binding agent gadobenate-dimeglumine (MultiHance in dynamic susceptibility contrast (DSC) perfusion imaging at 3 T. MATERIALS AND METHODS: Sixteen healthy volunteers underwent three separate examinations…
Abstract A series of 13 C‐enriched maleic anhydride grafted isotactic polypropylene samples were prepared in solution at 170 °C by changes in the initial maleic anhydride content. The NMR spectra of the samples showed that the signals of the maleic anhydride attached to the tertiary carbons of the isotactic polypropyl…
We report on electronic band structure calculations, using the ab initio full potential linearized augmented plane wave (FLAPW) method, for Sr 2 FeMoO 6 (SFMO) double perovskites presenting antisite defects or/and oxygen vacancies. We exhibit that the half-metallic character is preserved for SFMO containing only nearl…
Several poly(phenylene ethynylene)s with pendant hexafluoro-2-propanol (HFIP) groups have been synthesized and characterized in terms of their solution and thin-film optical properties. The incorporation of strongly hydrogen-bond-donating HFIP groups into conjugated polymers is shown to greatly enhance their fluoresce…
A cyanide-bridged W-Mn bimetallic compound [W(CN)(6)(bpy)](2)[Mn(H(2)O)(2)].4H(2)O (1) (bpy = 2,2'-bipyridine) with a one-dimensional, crossed double-zigzag chain structure was prepared by self-assembling [W(CN)(6)(bpy)](-) and Mn(2+) ions in a 2:1 reaction ratio. The magnetic properties of 1 exhibit a field-induced m…