Materials Literature
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The adsorption of adamantane, adamantanol, thiocamphor, and sodium cryptate on electrodes of single-walled carbon nanotubes (SWNT) from dimethylsulfoxide (DMSO) solutions is studied by measuring the differential capacitance ( C ) vs. potential ( E ) dependences and cyclic voltammograms. In the tested systems, the high…
为了制备高性能的聚合物/蒙脱土纳米复合材料, 必须对蒙脱土(MMT)进行有机改性来改善蒙脱土表面的疏水性、提高蒙脱土与聚合物之间的相容性, 同时也需要尽可能地增大蒙脱土的层间距. 为此, 提出了一种采用不同链长的聚醚铵阳离子协同插层MMT 的新方法, 即采用D2000(或T5000)聚醚铵盐与D400 聚醚铵盐协同插层MMT, 并采用X射线衍射分析(XRD)和热重分析(TGA)研究了协同插层对改性MMT 的层间距、有机含量以及耐热性的影响. 另外, 也研究了插层过程中的搅拌方式和D400 聚醚铵盐多次插层对改性MMT 的层间距、有机含量等的影响. 研究结果表明,采用长链聚醚铵阳离子协同插层更有利于提高D400 聚醚铵盐改性MMT…
Ceramic solid solutions on the base of composition from morphotropic phase boundary 0.36BiScO3-0.64PbTiO3 modified by the powdered Bi4Ti3O12 and Bi0.75Sr0.25O1.36 single crystals additives and by the low-melting LiF additive in amounts 5, 10, and 1 wt.%, respectively, have been prepared by the solid-state reactions me…
Efforts on the generation of intensified magnetic flux have been made for the optimized shape of HTS winding applications. This contributes to the high efficiency of the rotating machines using HTS windings. Heat generation from the HTS windings requires to be suppressed as much as possible, when those coils are under…
The fashion silhouettes had been replaced by the material oriented hand-made looks of surfaces of the textile materials after the 1980s when the plurality of styles started to appear in fashion industry. Textile designers have begun to explore relief effects taking their inspirations from traditional craft techniques…
The aim of this study was to investigate the tensile properties of the natural rubber nanocomposites containing surface modified cal-cium carbonate nanofiller. All nanocomposites were prepared at various nanofiller contents, using a laboratory scale two-roll mill. The results revealed that the ultimate tensile propert…
Stavudine oral disintegration tablets were formulated to minimize the bitter taste and to reduce the first-pass hepatic metabolism. The various precompression parameters like the angle of repose, bulk density, compressibility index and Hausner's ratio were determined for the powder blend. In this study, 14 formulation…
The formation of calcium phosphate phases is extremely important in a biomedical engineering context. These phosphates are used in many applications, such as grafts, drug-delivery processes and evaluation of the bioactivity of metallic surfaces. Considering this scenario, it is useful to evaluate the thermodynamic con…
Light and scanning electron microscopy studies of centric diatoms of the plankton in the middle Irtysh River and waterbodies and water courses of its basin have revealed 21 taxa of Centrophyceae from 9 genera, including 14 new for the region. A revision of the species composition allowed us to specify and broaden the…
The process of dehydrogenation of methyl butenes to isoprene is conducted in the presence of iron oxide catalysts whose composition may include oxides of alkaline metals, alkaline earth metals, and transition metals. Catalysts of latest generation can also contain oxides of rare earth elements, particularly cerium oxi…
The electronic structures in the surface and bulk states of Y3+-doped BaZrO3 (BaZr1-xYxO3-δ) have been studied by X-ray absorption spectroscopy and soft-X-ray emission spectroscopy. The valence band is mainly composed of the O 2p state hybridized with the Zr 4d state. The conduction band consists of Zr 4d state. The b…
Nonlinear optical properties, optical limiting and Optical phase conjugation through degenerate four-wave mixing is observed in Disperse Orange-25 dye-doped in Polymethyl methacrylate – metacrylic acid (PMMA-MA) polymer films under low-power, continuous-wave laser irradiation. A maximum phase conjugate efficiency of 0…
This paper presents a multi-input multi-output (MIMO) dynamic model of polymer electrolyte membrane (PEM) fuel cells. A non-linear controller is designed to prolong the stack life of the PEM fuel cell. A moderate deviation between hydrogen and oxygen partial pressures can cause severe membrane damage in the fuel cell.…
CdS nanoparticles and thin films are well known for their excellent semiconducting properties. When transition metal ions are doped into the CdS, it exhibits magnetic properties in addition to semiconducting properties and they are termed as dilute magnetic semiconductors (DMSs). In this paper, we discuss the preparat…
The single-nanosizing of a ceramics by a top–down method was demonstrated using a “wet planetary bead-milling” method, which is the combination of bead milling and planetary milling. By using the planetary bead-milling, single-nanoparticles (about 2 nm) of BaZr0.9Y0.1O3−α (BZY-91), which is one of the perovskite type…
Bacteria cellulose prepared from nata de coco which is composed of pure cellulose nanofibers. The nanofibers were dispersed in ethanol or distilled water and were stirred and then filtered to obtain paper-like sheets. The diameters of the nanofibers were in the range of 30 to 60 nm. The sheets were carbonized and then…
Equilibrium structures for a proton on β-D-galactose and transition states for proton hopping are computed. Also, Ab Initio Molecular Dynamics (AIMD) simulations are carried out. All calculations used B3LYP potentials with dispersion. At 40 K, proton hopping between sites is of near microsecond timescale. At 300 K, th…
We performed irradiation of epitaxial YBa2Cu3O7 films grown on CeO2-buffered SrTiO3 substrates by fluorine-free metal organic deposition with 3-MeV Fe2+ ions to study their effects on critical current density (Jc). We observed an increase of in-field Jc by up to 70%, which did not show a significant field-angle depend…
A novel method for the preparation of covalently bonded capillary coatings of polyethylene glycol (PEG) was demonstrated. Layer by layer self-assembly film of diazoresin (DR) and PEG based on hydrogen bonding was fabricated on the inner wall of capillary. The hydrogen bonding was converted into covalent bonding after…
Twenty-five percent of the total toroidal field (TF) coil conductors at the ITER are supplied by the Japan Atomic Energy Agency (JAEA). The jacket section of a TF conductor is made of modified 316LN. The JAEA tested three types of tensile specimens (Japanese-Industrial-Standards-type and ASTM-type) cut from the jacket…