Materials Literature
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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…
This paper examines some theoretical aspects of the relationship between the aging of oil and the deterioration of the internal insulation of the windings, and looks at some new findings that might provoke fresh consideration of the relationship between the analytical properties of liquid insulation and the dielectric…
The synthesis, characterization and mesomorphic properties of a new type of liquid crystalline compound, the 2,5-bis(3,4,5-trialkoxyphenyl)-1,3,4-oxadiazoles, 3a-3h, are reported. These heterocyclic compounds are derived from unsaturated 1,3,4-oxadiazole as the core group, and obtained by the condensation reaction of…
The effects of bath oxidizing power on hydrotalcite coating formation and breakdown were examined in this study. Overall, results indicate that increasing the oxidizing power of the coating bath shortens the immersion time required to form highly corrosion-resistant coatings. Hydrotalcite conversion coatings were form…
Ring-opening polymerizations of ε-caprolactone (CL) and L,L-dilactide (LA) initiated by tin(II) octoate (Sn(Oct)2) and zinc octoate (Zn(Oct)2) and co-initiated with butyl alcohol (BuOH) carried out in tetrahydrofuran as a solvent at 80 °C were studied. By means of MALDI-TOF mass spectrometry, the formation of several…
Blends of poly(ethylene terephthalate) (PET) and a poly(ethylene-co-propylene) rubber (EPR) were reactively compatibilised using various compatibilisers, having either glycidyl methacrylate (GMA) or maleic anhydride (MA) functionalities. The examined compatibilisers include ethylene/glycidyl methacrylate copolymers (E…
An erbium-doped silica-on-silicon planar waveguide optical amplifier is described. The active core is a topographic guide formed from aluminophosphosilicate glass doped with erbium and ytterbium. The buffer is formed from silica deposited by thermal oxidation and the cladding from borophosphosilicate glass obtained by…
The local piezoelectric properties of relaxor ferroelectric films of solid solutions 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3 were investigated by scanning force microscopy (SFM) in a piezoelectric contact mode. The piezoelectric hysteresis loops were acquired in the interior of grains of different sizes. A clear correlation bet…
Low-energy spin excitations in the molecular magnetic cluster V15 , G. Chaboussant, R. Basler, A. Sieber, S. T. Ochsenbein, A. Desmedt, R. E. Lechner, M. T. F. Telling, P. Kögerler, A. Müller, H.-U. Güdel
The Flory χ parameter is typically assumed to depend only on the temperature, T . Experimental results often require the replacement of this χ( T ) by χ eff, which depends also on the monomer volume fraction, φ, χ eff (φ, T ). Such χ eff (φ, T ) can arise from two-state models, proposed for polyetheleneoxide (PEO) and…
Abstract Isothermal and nonisothermal crystallization kinetics of nylon‐46 were investigated with differential scanning calorimetry. The equilibrium melting enthalpy and the equilibrium melting temperature of nylon‐46 were determined to be 155.58 J/g and 307.10 °C, respectively. The isothermal crystallization process…
Dendrimers constitute a new class of macromolecules having a hyperbranched and perfectly defined structure. The attractive beauty of these nanosized compounds induces since ten years an exponential development of the number of publications devoted to this topic. Most dendrimers are purely organic compounds, but hetero…
A low nickel copper alloy commonly used in the plumbing/drainage pipelines on ships was investigated under slow strain rate conditions in air, and in solution containing 3·5%NaCl + 10%MgCl2, with and without 1% ammonia. The tests were conducted at ambient temperature (28 ± 1°C) at strain rates corresponding to a cross…
Abstract The results of studies on the toxicity of the gas products of thermal decomposition and combustion of natural and synthetic fabrics, as well as the influence of flame retardants (FR) on the emission of toxic products from fabrics are presented. Thermal decomposition and combustion were investigated according…
Fine structure in the principal OH-stretching bands of amphiboles of the tremolite-ferro-actinolite series have been examined. In samples with partly filled A sites, a broad (composite) band is observed at 3725~3680 cm -1 and is assigned to two types of configurations: (M1M1M3)-OH- A ( Na,K): T1 Si T1 Al in which Al o…