Materials Literature
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When metallized capacitors are applied to pulsed power applications with frequency less than 1 Hz, heat induced by current can be ignored. However, it is necessary to consider the accumulation effect of heat on temperature rise of capacitors which are applied to repetitive pulsed systems. The paper mainly study the in…
We present evidence for the existence of a new form of charge transport in insulating polymers which takes the form of charge pulses that move exceptionally quickly across the insulation in comparison to the charge carrier mobility typical of such materials. This phenomenon could be associated with electromechanical c…
Amongst fission products formed in atomic reactors, 99 Tc is the most hazardous for the environment because of its long half-life (213000 yr), high content in spent nuclear fuel (SNF) (0.8–1.0 kg per ton of SNF), low sorption ability, and high mobility under aerobic conditions. The bulk of 99 Tc (∼200 t) is incorporat…
Temperature dependent synchrotron x-ray powder diffraction, differential scanning calorimetry, and magnetic measurements were performed on Ni2+xMn1−xGa (x=0.20 and 0.35) magnetic shape memory alloys. For x=0.20, though the monoclinic phase is thermodynamically stable, a trace of residual stress can stabilize a tetrago…
A 3 2+ Te6+M 3 2+ X 2 5+ O14 (A = Pb, Ba, Sr; M = Zn, Mg, Co, Mn, Cu, Cd; X = P, As, V) compounds and Pb3WZn3P2O14, all with Ca3Ga2Ge4O14 structure (space group P321), were prepared by solid-phase synthesis in air at 600–1000°C. Most compounds melt incongruently or experience solid-phase decomposition.
Macromolecule networks were introduced into the networks of normal sopping swelling materials by redesigning the materials molecule structure, and thus forming materials with the characteristics of retarding swelling, high strength and the structure of interpenetrating networks. The microscopic structure of the materi…
A dielectric barrier discharge reactor with inner electrode modified with metal oxides of Ti, Mn and Co has been designed and tested for the oxidation of diluted volatile organic compounds (VOCs) of different nature like toluene, isopropanol and trichloroethylene. It has been observed that at a fixed concentration of…
A versatile way of preparing macroporous monolithic materials from linear aliphatic polyamides is presented. Simply, polyamide pellets were treated in benzyl alcohol (BA) at elevated temperature, causing dissolution by interchain hydrogen bond disruption. Subsequent cooling below the upper critical solution temperatur…
The results of a UV-vis and fluorescent spectral investigation of a tetra-15-crown-5-substituted aluminum phthalocyanine [ (R 4 Pc)Al(OH) ] (1), where (R 4 Pc) 2- = 2,3,9,10,16,17,24,25-tetrakis(15-crown-5)phthalocyaninate-dianion, in different solvents (CHCl 3 , DMSO, MeOH) are reported. It was shown that compound ex…
The structures of two lead germante glasses – yGeO 2 ·(100-y)PbO and xNd 2 O 3 (100-x)[GeO 2 ·PbO] – are investigated by the Fourier transform infrared (FTIR) spectroscopy. The structural role of germanium, lead and neodymium ions is discussed. The presence of GeO 4 , GeO 6 and PbO 4 structural units was evidenced in…
In this work, ZrC-based composites reinforced with SiC particles were processed using the hot-pressing route. The influence of SiC content on the microstructure and mechanical properties of the hot-pressed composites was investigated. In all composites with different SiC contents, the highest relative density was obta…
Lipid matrix nanoparticles, such as solid lipid nanoparticles (SLN) and nanostructured lipid carriers (NLC), have been sought as a useful alternative for formulating poorly soluble drugs intended for several administration routes, e.g. oral, parenteral and topical. These systems are surfaced by a film of surfactant in…
We have investigated the antigorite m = 17 structure [Mg 48 Si 34 O 85 (OH) 62 ] by density functional theory (DFT), with the aim to probe the method on such a large and low symmetry (Pm) system. We found a satisfactory match with the experiments using both LDA and GGA approximations to exchangecorrelation, although t…
The properties of silicate glasses and melts containing magnesium are analyzed in comparison with the properties of glasses and melts in which magnesium is replaced by aluminum. In particular, the properties of the glass and the melt of the diopside composition CaMgSi2O6 are analyzed in comparison with the properties…
The photoluminescence, its excitation and absorption spectra of MgO single crystals are investigated before and after the irradiation with fast neutrons. It is shown that the fast neutron irradiation leads to the formation of two types of centers: the interstitial proton H+i and the Mg(OH)2 microphase. From the behavi…
In situ structural characterization techniques that are capable of characterizing piezoelectric ceramics under different electrical loading conditions are important to understand the behavior of materials during their use. In this work, we report the use of a laboratory X-ray diffractometer for the measurement of vari…
Polypropylene is extensively used as a dielectric in power capacitors, electrical machines and transformers. It has excellent mechanical, thermal, and electrical properties and provides outstanding resistance to moisture, grease, and oils. It does not present stress-cracking problems and at high temperatures it offers…
Relationship between breakdown strength and space charge formation in polyimide film under dc high stress at various temperatures is investigated using pulsed electro-acoustic (PEA) method. Polyimide films are used for various electric and electronic devices as insulating materials. They are demanded to show a good pe…
X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy have been employed to investigate the (Fe 2 O 3 ) x ·(B 2 O 3 ) (60-x) ·(ZnO) 40 samples, with 0 ≤ x ≤ 20 mol%. The samples have been prepared by melting at 1100 °C for 10 minutes followed by rapid cooling at room temperature. The structure of…
Mineralogical changes in a set of phyllosilicates, differing in their layer nature, chemical composition, octahedral character, and Al content of the tetrahedral sheet, were analyzed after hydrothermal reaction in an alkaline solution. The composition of the alkaline solution was selected to simulate the first stage o…