Materials Literature
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Fiber‐coating debonding observed by transmission electron microscopy is suggested as the cause for an ∼60% reduction in strength after one cycle of 1600°C heat treatment in a carbon/silicon carbide (C/SiC) composite fabricated by polymer infiltration and pyrolysis with pure allylhydridopolycarbosilane polymer as the m…
ABSTRACT The microstructure of α‐gel and β‐crystalline emulsifiers and their effects on cake batter foam have been studied with polarized light microscopy, confocal laser scanning microscopy (CLSM) and image analysis, freeze‐etching, and transmission electron microscopy (TEM). The emulsifiers Colco and Aroplus, which…
Abstract The fracture behavior of 1‐mm‐thick syndiotactic polypropylene (sPP) sheets of various crystallinity (owing the various stereo‐ and regioregularity) was studied by the essential work of fracture (EWF) concept. The specific work of fracture parameters were determined on tensile‐loaded deeply double‐edge notche…
To demagnetize small-scale objects (dimensions less than 1 m) fabricated from ferromagnetic materials, it is standard practice to expose the object to a continuous AC applied magnetic field with a steadily decaying amplitude. For objects of dimensions greater than 10 m, there are problems of scale, and a stepwise proc…
The diffusive behavior of the cation and anion species of the PEO-type polymer electrolyte has been investigated using pulsed gradient spin-echo NMR to elucidate the carrier conduction mechanism of the polymer electrolyte. Compared with the random diffusive behavior generally observed in electrolyte solutions, the car…
Photon energy response of MTS-N (LiF:Mg,Ti) detectors (TLD Poland) and of MTS-N detectors sensitised with 200 Gy of 60Co gamma rays, followed by UV irradiation (sMTS-N), has been determined using X rays with narrow energy spectra, in the energy range from 20 to 300 keV. The over-response of LiF:Mg,Ti detectors for X r…
The atomic structure and chemical composition of a =3, [110]/{111} symmetric tilt grain boundary in an yttria-stabilized cubic zirconia bicrystal has been investigated by high-resolution transmission electron microscopy (HRTEM) and nanoprobe energy-dispersive X-ray spectroscopy. The experimental HRTEM images are compa…
The microstructure of a number of ethene/propene copolymers prepared with three representative C2-symmetric ansa-metallocene catalysts was investigated by means of high-field (150 MHz) 13C NMR. Thanks to the exceedingly high resolution of the spectra, an unprecedented experimental basis for the constitutional sequence…
Abstract The effects of ultrasonic irradiation on extrusion processing and crystallization behavior of polypropylene (PP) are examined. The results show that appropriate irradiation intensity can prominently decrease die pressure and apparent viscosity, increase output, reduce extrudate swell, and improve apparent qua…
The cyano-bridged molecular complex [Ni(C6H14N2)2]3[Fe(CN)6]2·2H2O, with a rectangular 2D structure, displays long-range ferromagnetic ordering at 14 K, and exhibits unusual magnetic properties for this type of material, as confirmed by the appearance of two different peaks in the AC magnetic susceptibility plot, and…
The plasma source ion implantation (PSII) technique was used to improve the adhesion between linear low-density polyethylene (LLDPE) and biopolymer. LLDPE was treated with the PSII using O(2) or CF(4) gas to modify its surface. After modification, chitosan or corn zein was used for coating on LLDPE. Wettability of the…
Abstract Scanning and transmission electron microscopy investigations and X-ray diffraction measurements were performed on cyclically deformed nickel samples showing average grain sizes D between 500 nm and 5 μm and containing different initial dislocation structures. The results are discussed in comparison with main…
The temperature dependent electrostrictive behavior of rhombohedral Pb(Zn1/3Nb2/3)O3-xPbTiO3 crystals (PZN-PT, x<0.09) was investigated. Although the application of an E field induces a macroscopic ferroelectric phase at room temperature, rhombohedral crystals still exhibit relaxor characteristics, such as pola…
The fully leaky guided-mode optical-waveguide technique has been used to characterize the tilt profiles in two E7-filled hybrid-aligned nematic cells. The director distortion was measured with ac and dc voltages applied perpendicular to the substrates. By comparing the tilt profiles with model profiles produced using…
SiO 2 -coated Co nanoparticles in a size range of 10 to 50 nm were synthesized by a wet chemical approach, and their structure and magnetic properties were investigated using x-ray diffraction, high-resolution transmission electron microscopy, and a superconducting quantum interference device magnetometer. The structu…
Abstract A unified formulation is presented for modeling the injection molding of isotactic polypropylene (i‐PP). The crystallization kinetics are based upon the differential Nakamura equation in which the characteristic time is dependent upon temperature, pressure and flow‐induced shear stress, without any explicit n…
The aim of this work was to determine important dosimetric characteristics of several types of the most interesting tissue-equivalent thermoluminescent detectors (TLDs). Special attention was given to the determination of energy dependence for medium and low energy X rays. The following types of TLDs were investigated…
The influence of hydrostatic pressure (up to 5 kbar) on the magnetic structure of Ce2Fe17 was investigated using neutron diffraction in the temperature range from 2 to 300 K. The existence of a collinear ferromagnetic phase below 95 K with a magnetic moment of Fe, mFe=2.0 μB, was confirmed at ambient pressure. Magneti…
High-resolution scanning electron microscopy and cathodoluminescence spectroscopy measurements were performed to study the effect of postgrowth annealing on properties of ZnO films grown on GaAs substrates by rf sputtering. The films annealed at 550 °C show a well-oriented columnar structure and strong exciton emissio…
The coarsening of spherical n -Fe and f -Fe precipitate particles in Cu-Fe alloys aged at 600, 650 and 700C has been studied by measuring both the particle size by transmission electron microscopy and the Fe concentration in the Cu matrix by electric resistivity. The average size of n -Fe and f -Fe particles increases…