Materials Literature
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A near-field electrospinning (NFES) process has been developed to deposit solid nanofibers in a direct, continuous, and controllable manner. A tungsten electrode with tip diameter of 25 microm is used to construct nanofibers of 50-500 nm line width on silicon-based collectors while the liquid polymer solution is suppl…
Abstract Two different test apparatuses are used at BAM to evaluate the safety of oxygen components: First, the “promoted ignition combustion test” according to ASTM G 124 [1] and to EIGA IGC Doc 13/02/E [2], and second, the new “metallic disk ignition test” that has not been standardized yet. The standard test method…
Abstract It is shown that the heat conductivity of carbon fiber (CF)‐reinforced aromatic polyamide on the basis of phenylone can be described within the framework of a fractal model. Depending on the dimension of filler fibers network (system), such description can be obtained by the application of two limiting cases:…
Accurate measurements of the temperature dependence of spontaneous polarization and dielectric constant in the vicinity of the phase transition from the paraelectric to the ferroelectric phase in ${\mathrm{SrTi}}^{18}{\mathrm{O}}_{3}$ were performed. Dielectric constant and soft mode frequency can be well described [M…
Lead zirconium titanate (PZT) ceramic specimens were prepared by liquid phase sintering with excess PbO. By the addition of a small amount of MgO, the grain shape was changed from spherical to angular. When SiO 2 was further added, twin was induced in a few grains, which grew abnormally during heat treatment. Through…
Using a novel combustion method, Eu‐doped Eu:yttrium aluminum garnet (YAG) and Eu:YSAG powders, and transparent Eu:YSAG ceramics were fabricated. The optical properties of these transparent ceramics have been measured, and a reduced peak splitting of Eu 3+ for 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 was observed when 10 at.%…
We measured the temperature dependence of dielectric constant and striction for spinel MnT 2 O 4 (T = V, Cr, Mn) under magnetic field. We found critical changes of the dielectric constant and striction with ferrimagnetic ordering as well as applied magnetic field in MnV 2 O 4 and Mn 3 O 4 , which have orbital degree o…
Abstract The clay is treated with a reducing agent and an acid so as to obtain a clay containing various metal components with a variable‐valence state. Then, the clay is coprecipitated with natural rubber (NR) latex to prepare a vulcanized NR/clay composite. The degradation process of the NR/clay composite under hot…
The average concentration of N -methylmorpholine- N -oxide (NMMO) in the running Lyocell filament was measured in the coagulation process by which the precipitation kinetics of cellulose in the Lyocell process was studied. It was found that there are two diffusion regimes in the coagulation process of cellulose in the…
The {1 1 1} twins frequently observed in pressureless‐sintered BaTiO 3 ceramics have been analyzed by the X‐ray diffractometry, scanning and transmission electron microscopy. Both the single twins and double lamellar twins are growth (or annealing) twins. The twins lying in the {1 1 1} mirror planes, which is not one…
We have synthesized A-D-A-type linear chain chromophores based on oligo(phenylene vinylene) as an electron donor (D) and several electron/energy acceptors (A), which are linked by an alkyl spacer with various lengths and are processed for a helical encapsulation with amylose. Photoinduced electron/energy transfers (eT…
Abstract Polyacrylonitrile (PAN) hollow fibers were pretreated with ammonium dibasic phosphate, then further oxidized in air, carbonized in nitrogen, and activated with carbon dioxide. The effects of activation temperature of a precursor fiber on the microstructure, specific surface, pore‐size distribution, and adsorp…
Properties of argon adlayers deposited on a graphite substrate are calculated using a high resolution Monte Carlo calculation. Nine different surface densities are examined ranging from very partial to slightly beyond a complete monolayer. At low densities the calculated specific heats show two peaks. One is very shar…
Abstract The nanocomposites of polyamide1010 (PA1010) filled with carbon nanotubes (CNTs) were prepared by melt mixing techniques. The isothermal melt‐crystallization kinetics and nonisothermal crystallization behavior of CNTs/PA1010 nanocomposites were investigated by differential scanning calorimetry. The peak tempe…
We report the first kinetic measurement of cross-nucleation between polymorphs, a newly discovered phenomenon important to the theory and control of crystallization. d-Mannitol crystallized from its melt first as the least stable delta polymorph and then as the second least stable alpha polymorph, with alpha nucleatin…
Multilayered manganese oxide nanocomposites intercalated with strong (poly(diallyldimethylammonium) chloride, PDDA) and weak (poly(allylamine hydrochloride), PAH) polyelectrolytes can be produced on polycrystalline platinum electrode in a thin film form by a simple, one-step electrochemical route. The process involves…
Solid-state NMR is especially useful when the structures of peptides and proteins should be analyzed by taking into account the structural distribution, that is, the distribution of the torsion angle of the individual residue. In this study, two-dimensional spin-diffusion solid-state NMR spectra of 13C-double-labeled…
The equilibrium geometries of four asymmetric spirosilabifluorene derivatives are optimized by means of the DFT/B3LYP method with the 6-31G* basis sets in this paper. On the basis of the optimized structures, the electronic structure and second-order nonlinear optical properties are calculated by using time-dependent…
Abstract Polycrystalline hexagonal alkaline earth aluminates M 3 Al 16 O 27 doped by divalent europium were prepared by solid state reaction. The crystal structure and optical properties at room temperature were investigated. The structure parameters were refined using Rietveld refinement procedures. The space group o…
Abstract Chitosan is functionalized with poly(ethylene glycol) methyl ether (mPEG) at the amino and hydroxyl groups via a single step reaction in a homogeneous aqueous system. A chitosan aqueous solution obtained from the mixture of chitosan and hydroxybenzotriazole (HOBt) in water is a key factor in providing mild co…