Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Thin films of diblock copolymers with cylindrical microdomains oriented normal to the film plane are employed as planar optical waveguides in the Kretschmann configuration (see Figure). Their waveguiding properties were investigated by optical waveguide spectroscopy. The dielectric constants and the film thickness of…
The gyromagnetic factors g ∥ , g ⊥ and the hyperfine structure constants A ∥ and A ⊥ of the tetragonal Cu 2+ center in KTaO 3 are theoretically studied in this work. Based on the analyses of the electron paramagnetic resonance results of this center, it is found that the impurity Cu 2+ occupies the octahedral Ta 5+ si…
Propionate is a very abundant carbon source in soil, and many microorganisms are able to use this as the sole carbon source. Nevertheless, propionate not only serves as a carbon source for filamentous fungi but also acts as a preservative when added to glucose containing media. To solve this contradiction between carb…
Hyperbranched polymers (HBPs) formed by a self-condensing vinyl polymerization (SCVP) of copolymerization of AB* monomers slowly added into trifunctional C 3 * cores under various feed rates were investigated by a kinetic model. The dependences of average molecular weight, polydispersity, degree of branching, and numb…
The mass transfer of naphthalene vapor to water droplets in air was studied in the presence of ozone (O3) in the gas phase. A falling droplet reactor with water droplets of diameters 55, 91, and 182 microm was used for the study. O3 reacted with naphthalene at the air-water interface, thereby decreasing the mass trans…
The electronic properties of ${({\mathrm{Li}}_{2}\mathrm{O})}_{x}{({\mathrm{B}}_{2}{\mathrm{O}}_{3})}_{1\ensuremath{-}x}$ ($x=0.0$, 0.25, 0.33, 0.5, 0.75, and 1.0) compounds were studied by periodic quantum-chemical calculations at density functional theory level using localized atomic basis functions. A good agreemen…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
The effects of oxygen versus vacuum ambients on colloidal CdSe/ZnS quantum dots (QDs) were studied using both continuous and time-resolved photoluminescence (PL) measurements. The PL intensities were found to be an order of magnitude higher in an oxygen atmosphere, which is explained by the passivation of surface defe…
Various cryoprotectants were tested to reconstitute the surfactant-free nanoparticles of poly(DL-lactide-co-glycolide) (PLGA). When 2.0% (w/v) of sucrose, trehalose and lactose were used, nanoparticles were completely reconstituted into aqueous solution and particle size was not significantly changed. Above 1.0% (w/v)…
A series of asymmetrically substituted dodecafluorinated phthalocyanines has been synthesized via the Kobayashi ring expansion reaction of the corresponding dodecafluorinated boron subphthalocyanine with differently substituted 1,3-diiminoisoindolines. The mild reaction conditions employed during this ring expansion r…
The acoustic emission from collapsing cavitation bubbles generated using ultrasound of 20 kHz and 515 kHz frequencies in water has been measured and correlated with sonoluminescence and hydroxyl radical production to yield further information on the frequency dependence of sonochemical reactions. A reasonable correlat…
BiFeO 3 thin films with various thicknesses were grown on (100) c SrRuO 3 ∥(100)SrTiO 3 substrates at 620°C by metalorganic chemical vapor deposition (MOCVD) for the first time. X-ray diffraction analysis revealed cube-on-cube epitaxial growth of phase-pure BiFeO 3 films with (001) orientation irrespective of the film…
With the use of high-resolution transmission electron microscopy the structure and morphology of montmorillonite (MMT), a material of current interest for use in polymer nanocomposites, was characterized. Using both imaging theory and experiment, the procedures needed to generate lattice images from MMT were establish…
We examine the structure and properties of cold drawn Ti-50.1 at % Ni and Ti-50.9 at % Ni shape memory alloy wires. Wires with both compositions possess a strong <111> fiber texture in the wire drawing direction, a grain size on the order of micrometers, and a high dislocation density. The more Ni rich wires contain f…
The first successful preparation of nanofibers of a polyampholyte (N-carboxyethylchitosan) by electrospinning was achieved by adding a non-ionogenic water-soluble polymer to the spinning solution. Using this approach, other polyelectrolytes, poly(2-acryloylamido-2-methylpropanesulphonic acid) (PAMPS), and copolymers o…
We used a resonant ultrasound spectroscopy technique to measure the nine independent elastic constants of cyclotrimethylene trinitramine C3H6N6O6 also known by its code designation RDX. The measurements were made on a single crystal grown from acetone containing RDX in solution. The elastic constants in gigapascal uni…
Ex situ transmission electron microscopy (TEM) was used to study the crystal morphology in sputtered amorphous Ge4Sb1Te5, Ge2Sb2Te5, and Ag0.055In0.065Sb0.59Te0.29 thin films used for phase change recording. Tilting of plan view samples revealed that each crystallized growth formation is a bent single crystal. Cross-s…
High-yield multiwalled boron nitride (BN) nanotubes have been produced using a ball milling−annealing method. The BN nanotubes with a diameter less than 10 nm and a well-crystallized multiwalled structure were formed via an in situ nitriding reaction. The systematic investigation of the formation process at different…
The selection of the optimum fluoroelastomer, from the vast range available, for a high temperature or chemically aggressive application is often hampered by insufficient data on the thermal stability of the materials, especially under transient conditions. This feature describes the use of strain energy density to as…
Surfactant templated mesoporous silica thin films were prepared as the intermetal dielectric for ultralarge scaled integrated circuit application, and the thermal and chemical stability of the Cu∕nitridedTa∕mesoporous silica film stack on the Si wafer was studied. Trimethylsilylation of the mesoporous silica thin film…