Materials Literature
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The reorientational mobilities of molecules in nonlinear optical (NLO) polymers poled by thermal-assisted (TAP) and photoassisted (PAP) electric-field polings are compared by measuring the temporal development of the NLO properties under a secondary poling voltage at a temperature below the glass transition temperatur…
Boron-modified polyvinylsilazanes have been studied for suitability as fiber precursor. A melt-tractable polymer displaying Si- and N-bonded methyl groups was successfully processed into green fibers ~18μm in diameter via a melt-spinning process. After the shaping process, the use of an ammonia curing atmosphere at 20…
Local blistering observed upon high-temperature annealing of natural diamond single crystals implanted by 350-keV hydrogen ions with a dose of 12 × 1016 cm−2 is studied. Based on room-temperature measurements, Griffith cracking criterion, and gas law, model quantitative calculations of blister size (R j = (0.361−5.568…
The isotropic Sm2Fe17Nx magnetic powders were prepared by Hydrogenation-Disproportion-Desorption-Recombination (HDDR) process. The phase and microstructure evolutionary process of Sm-Fe alloy during the solidification, homogenization, HDDR and nitration processes were investigated by means of XRD, SEM, EDX and AFM. Th…
The dispersion stability of graphite-HNO 3 suspensions was studied in relation to the acid concentration, dispersity of the graphite powder, and solid-to-liquid phase ratio. The relative electrical resistivity was determined for the same system.
The effect of 2.5 at. % Ca addition on the grain size and crystal lattice of hydrothermally produced barium titanate nanopowders was studied by field-emission transmission electron microscopy (FE-TEM). The fabrication of the nanopowders involved the heat treatment of Ba 0.975 Ca 0.025 TiO 3 and BaTiO 3 powders. The gr…
Effect of crystallinity change on electrical conduction characteristics of poly-L-lactic acid was studied experimentally. The crystallinity was changed by thermal annealing. The lower crystallinity samples have more remaining charge than the higher crystallinity samples. Moreover, at 80 degC that is above their glass…
Charge distributions in electron beam irradiated polymers are observed using the pulsed electro-acoustic (PEA) method. In space environment, bulk charge accumulation in insulating materials of a spacecraft, which is exposed in the radiation of cosmic rays, is one of remarkable problems because the accumulation may som…
Measurements of effective thermal conductivity Q,) and effective thermal diffusivity (X,) of twin pellets of conducting polyaniline, prepared under a load of 5 ton were carried out from room temperature to 170 degrees C at normal pressure using transient plane source (TPS) technique. The values of lambda(c) and chi(c)…
We present dynamic and static photoluminescence studies on polymer blends of conjugated poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV) with polystyrene-co-1-pyrenyl methyl methacrylate and its copolymer poly(styrene-co-2-ethylhexyl acrylate-co-1-pyrenylmethyl methacrylate) (with 9 mol% and 19 mol%…
Success in surgical joint replacements has resulted in a huge demand amongst patients. Coupled with the lowered average age of patients requiring hip replacements, younger patients are demanding longer life expectancy from such devices. The increasing need and demand for more durable implants have led to new formulati…
In recent decades, the theory and applications of the Gibbs equilibrium thermodynamics of heterogeneous systems have been advanced in several directions. In particular, the stability theory of heterogeneous systems with solid phases has already been proven valuable in many traditional and novel areas, including the on…
Pb 1 − x Cd x Ti O 3 (0.0⩽x⩽0.08) compounds in the tetragonal phase were prepared by the solid state reaction. Neutron powder diffraction study revealed that Pb1−xCdxTiO3 exhibits an unusual structural property. Although the tetragonality (c∕a) is enhanced by Cd substitution for Pb, the cation displacement of spontane…
Due to a power density increase, the thermal stresses endured by the electrical insulation of rotating machines are also increasing. However, up to now, most of the characterization (breakdown voltage, permittivity, loss tangent) are carried out in a temperature range which rarely exceeds the thermal class. Consequent…
We have numerically studied microwave plasma discharge for the chemical vapor deposition of single-crystal diamond. It is experimentally confirmed that the arrangement of the seed substrate and local configurations affect the growth rate and macroscopic surface morphology. We found correspondences between experimental…
Fe(III) and Mn(III) complexes with salen possessing appended ligands, [Fe(salen)Cl] · CH3CN(1) and [Mn(salen)(SCN)CH3OH]·CH3CN(2) [salen=N, N′‐bis(2‐hydroxylphenyl)‐o‐phenylene‐diamine], have been synthesized, and their crystal structures have been determined by X‐ray diffraction analyses. The complex (1) belong to tr…
Micro gas bubbles of uniform diameter are generated periodically when liquid under pressure near the tip of a cylindrical needle is oscillated by an ultrasonic wave. Here, using a boundary element method, we simulated this gas-liquid interface behavior previously reported by Makuta et al. [J. Fluid Mech. 548, 113 (200…
Closed-cell polymer-foam electrets with internal bipolar charge exhibit strong longitudinal piezoelectricity. The size and the shape of their internal voids can be controlled by means of an inflation process that consists of a high-pressure treatment followed by a heat-setting procedure. Experimental data reveal a max…
The partial discharge behavior in voids when induced by continuous and pulsed X-ray is investigated. For this work, epoxy samples with artificially generated voids were prepared. The experimental setup used allows simultaneous application of applied voltage and X-ray in the sample. Different values of the X-ray intens…
Values of the gamma-ray mass attenuation coefficient for fly-ash glasses in the system: xBi2O3-0.2B2O3-yFly Ash and xPbO-0.2B2O3-yFly Ash (x = 0.70, 0.65, 0.60, 0.55, 0.50, 0.45, 0.40 and y = 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40) have been determined experimentally at 81-, 356-, 511-, 662-, 1173-, and 1332-keV pho…