Materials Literature
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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…
Ultradisperse copper powders were produced by reduction of copper sulfate with glycerol, L -ascorbic acid, sodium hypophosphite, glucose, and hydrazine. The influence exerted by the nature of a reducing agent on the size-related parameters and physicochemical properties of the powders was studied.
Under the use of super-dry dimethylformamide containing tetraalkylammonium salts (TAAX with X = Cl, Br, I, ClO, BF 4 , etc.) platinised platinum layers may exhibit a reversible charging process that occurs at quite negative potentials (more negative than – 2.2 V vs. saturated calomel electrode (SCE)). The mode of reac…
The yield of hydrogen gas generated by radiolysis of water with SiO2 nanoparticles dispersing was found to increase with the dose of gamma rays pre-irradiation of the particles. Pre-irradiation experiments will be carried out also by using electron beams and for nanoparticles of other kind of materials to investigate…
We have prepared pH-responsive PM-CO2H films atop an alumina porous support by a surface-catalyzed polymerization and subsequent hydrolysis. Film resistances against ion transfer decrease by a factor of 200 between pH 4 and pH 11 as the film becomes charged.
Abstract A photochromic diarylethene, 1,2‐bis(2‐methyl‐5‐(4‐ N , N ‐dimethylaminophenyl)thien‐3‐yl)perfluorocyclopentene in proton‐donating media was studied. The ammonium salt came into being in the presence of acetic acid following localization of lone pair electrons of the amino group. The maximum absorption of the…
The piezoelectric characteristics of boron-nitride and carbon nanotubes were calculated. The electronic structure of nanotubes was studied using the quantum-chemical semiempirical MNDO method within a molecular-cluster model. The piezoelectric constants e zzz, e xzz, and e xxx of boron nitride nanotubes of two structu…