Materials Literature
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A magnetic field has a lot of useful functions. We focus on two of these functions. The first one is alignment of crystals with magnetic anisotropy. We aligned hydroxyapatite crystals and graphite whiskers during slip casting process under the imposition of the high magnetic field. In the case of the hydroxyapatite cr…
The available EPR data on binuclear copper(II) complexes with aliphatic hydrocarbon spacers are surveyed. The mechanisms responsible for exchange coupling in these spacered dimers are considered.
Solid state and solution chemistry of a supramolecular system, a sodium complex with ligands of tetrathiafulvalene (TTF) dicarboxylate and benzotriazole molecules, have been studied. The well characterized host–guest response in H2O–CH3CN (1 ∶ 1 v/v) was monitored by electronic spectra and cyclic voltammetry. The host…
Hemp, jute, flax, bagasse, coconut and bamboo fibers are some of the natural fibers that have attracted attention for the preparation of composite materials because of their low cost compared with synthetics fibers (glass, carbon). The performance of a natural fiber as reinforcement in composite materials is linked to…
The specific features of the “incommensurate-commensurate” phase transitions induced by a magnetic field in multiferroics (materials with coexisting magnetic and electric ordering) are considered. These materials are ferroelectromagnets, for example, bismuth ferrite BiFeO 3 and BiFeO 3 -based compounds, which have spa…
A plasma-enhanced chemical-vapor deposition process was employed to synthesize carbon nanofibers (CNFs) on glass substrates patterned with Ni catalytic films. At the gas pressure of 20mTorr and the substrate temperature (surface) of ∼500°C, the isolated and vertically aligned carbon nanofibers have been successfully s…
We compare Raman and infrared spectra of the nuOH/OD modes in benzoic acid crystal powders at 7 K. The extremely sharp Raman bands contrast to the broad infrared profiles and suggest adiabatic separation of hydrogen (deuterium) dynamics from the crystal lattice. There is no evidence of any proton-proton coupling term.…
The influence of nitrates and chlorides on the passive film of alloy 22 (Ni-Cr22-Mo13-W3-Fe3) in chloride-containing solutions (1 and 4 m NaCl) from pH 5 to at 60 and is characterized. The combination of nitrates and chlorides in low pH solutions leads to a variety of different corrosion states, including: active, pas…
Abstract The (110) surface of rutile TiO 2 (110) has been modeled using a density functional theory (DFT) plane‐wave pseudo‐potential method (CASTEP). In this study, 6 and 9 atomic‐layer slabs have been examined. The stoichiometric surface converges to a low‐spin solution in both cases with a density of states (DOS) s…
The paper describes centric diatoms of the class Coscinodiscophyceae (Thalassiosirophycidae) identified in materials collected from springs and streams of the Wy.yna Krakowsko-Cz.stochowska upland in 1993.2005, supplemented by records from related literature. The presence of 20 species belonging to seven genera is con…
The mechanical and dielectric breakdown properties of polylactic acid (PLA), which is a biodegradable plastic, were examined, and a physicochemical analysis was performed. At room temperature, the tensile strength of PLA was about 100 MPa, almost the same as for PP, but at 100°C, even the value for LDPE decreased. The…
Pressure‐shear plate impact experiments are used to study the nonlinear dynamic response of an elastomer at shearing rates of 105 – 106 s−1. Samples with thicknesses in the range 100 μm – 400 μm are cast between two hard steel plates. Because of the comparatively low impedance of the elastomer, longitudinal waves reve…
Purpose The paper gives a new measurement method of the parameters characterising the magnetic laminations for broadband low-level signals defined at any operational point. Design/methodology/approach High frequency phenomena machines fed by PWM inverters are related to low-level signals corresponding to minor hystere…
Abstract — An electromagnetic shielding of objects using ferrite-graphite composites is considered. The analytical model, using the Maxwell Garnett formulation for multiphase mixtures, results of computations based on this model and plane-wave formulation, and some experimental results are represented. Keywords- shiel…
The need for faster, smaller, and more reliable and efficient products has resulted in increase of heat generated in microelectronic components. The removal of the heat generated is an important issue in electronic packaging. The present research work aims at developing a new class of nano-thermal interface material (…
Adsorption behaviors of 2,2′‐bipyridine (2,2′‐BiPy), 2,4′‐bipyridine (2,4′‐BiPy), and 4,4′‐bipyridine (4,4′‐BiPy) on gold nanoparticle surfaces have been comparatively investigated by means of UV‐vis absorbance spectroscopy and surface‐enhanced Raman scattering (SERS). The three bipyridine compounds are assumed to hav…
The transition of intergranular corrosion (IGC) to intergranular stress corrosion cracking (IGSCC) in AA2024-T3 was studied using microfocal X-ray radiography, scanning electron microscopy (SEM), and electrochemistry. A constant potential was applied in 1 M NaCl solution, and a fixed elastic tensile displacement was a…
Pellet boilers need auxiliary electrical power to provide CO2-balanced heat in a comfortable and environment-friendly way. The idea is to produce this and some extra electricity within the furnace in order to save resources and to gain operation reliability and independency. Thermoelectric generators (TEGs) allow dire…
Epoxy/ alumina nanocomposites were newly prepared by dispersing 3, 5, 7, and 10 weight (wt) % boehmite alumina nanofillers in a bisphenol-A epoxy resin using a special two-stage direct mixing method. It was confirmed by scanning electron microscopy imaging that the nanofillers were homogeneously dispersed in the epoxy…
In this paper the Preisach model is used to simulate the magnetic hysteresis. The model is able to represent the hysteresis property of the ferromagnetic material if its distribution function P(HM,HC) is well determined. Three distributions, Gaussian, Cauchy and lognormal, are combined to produce different distributio…