Materials Literature
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Chitosan is a natural polysaccharide which is generally biodegradable, biocompatible and mucoadhesive, thus, attracting considerable interest of scientific researchers. The application of chitosan as nanocarriers for drug delivery thrived. And some of their pharmacokinetics and biodistribution profiles were studied, w…
A copolymer of 4H-cyclopenta[2,1-b:3,4-b’]dithiophene (CPDT) and pyrene was electrochemically synthesized in acetonitrile (ACN) containing sodium perchlorate (NaClO4). Cyclic voltammetry (CV), UV-vis and FT-IR analyses confirmed that the resulting polymer was a copolymer rather than a blend or a composite of the respe…
We deal with a single-crystal X-ray diffraction study of boulangerite from a plumose sample from the Bottino mine, Apuan Alps, Italy. Chemical composition of the analyzed sample is Pb 4.89 (Sb 4.08 As 0.04 Bi 0.01 ) ∑4.13 (S 10.98 Se 0.02 ) ∑11.00 . The crystal structure was investigated and evaluated in terms of the…
In cloaking, a body is hidden from detection by surrounding it by a coating cloaking material. In the coordinate transformation method the body to be hidden is transformed virtually into a point or a line. Some components of the electrical parameters of the cloaking material (ε, μ) are required to have infinite or zer…
Mossbauer spectroscopy was used to probe the site-specific information of a K0.84Fe1.99Se2 superconductor. A spin excitation gap, Delta E approximate to 5.5 meV, is observed by analyzing the temperature dependence of the hyperfine magnetic field (HMF) at the iron site within the spin wave theory. Using the simple mode…
In this paper we present work showing evidence of a shift in the Stress Migration (SM) peak profile temperature for smaller interconnect linewidths typically associated with the 32 nm technology node and beyond. With other parameters (fabrication, materials, line thickness and via diameter being kept nominal among the…
The viscosity dependence of immiscible alloys, such as Al96Bi4, Al93Bi7, Al90Bi10 and pure Bi on temperature was measured using a torsional oscillation viscometer. The variation in viscosity with temperature deviated from the Arrhenius equation near the critical temperature. The temperature dependence of the viscosity…
The frequency and temperature dependences of the ac capacitance and resistivity of FeIn 2 S 4 semiconductors are studied. Resonances are observed at certain temperatures in the frequency range (2.5–5.0) × 10 5 Hz. The permittivity of the crystals and the activation energy of charge carriers are determined. It is found…
Crystal structures of isomorphous crystal nonahydrates of aluminum, gallium, and scandium perchlorates were determined by the X-ray crystal analysis at room temperature. The estimate of associates present in concentrated solutions was carried out by the method of X-ray diffraction in aqueous solutions of aluminum perc…
Photoinduced enhancement of the solubility of annealed films made of chalcogenide glassy semiconductors (ChGSs) in amine-based selective etchants has been observed. The etching rate increases with the illumination intensity, and its spectral dependence is correlated with absorption in the film at the absorption edge.…
The magnetism driven by cation defects in undoped CeO 2 bulk and thin films is studied by the density functional theory corrected for on-site Coulomb interactions (DFT+ U ) with U = 5 eV for the Ce4f states and U = 7 eV for the O2p states. It is found that the Ce vacancies can induce a magnetic moment of the ∼ 4 μ B /…
Abstract Fracture toughness (K IC ) of high purity cold isostatically pressed alumina ceramic (CIP-Al 2 O 3 ) was determined from the size of cracks induced by Vickers hardness testing at wide range of loads. The observed cracks appeared at following loads: 4.905 N, 9.81 N, 29.43 N and 49.05 N. The studied material ex…
The article discusses the results of mathematical and experimental simulation of the impact of atomic oxygen of the Earth’s upper atmosphere on carbon and boron nitride nanotubes, graphene, hexagonal boron nitride sheets, and graphene nanoribbons, as well as composites based on polymer matrices with fillers in the for…
For zirconium alloys of the type E110 (Zr-Nb) and E635 (Zr-Nb-Sn-Fe), the dynamics of accumulation (variation) of concentrations of alloying elements and impurities, including hydrogen and helium, the behavior of primary radiation damage and radioactivity under irradiation up to 50 years in the neutron spectrum of a V…
The effect of vinyl alcohol-phthalic anhydride as a coupling agent on the tensile properties, morphology, and thermal degradation of low density polyethylene/tyre dust (LDPE/TD) composites was studied. LDPE/TD composites with different tyre dust loading and the addition of vinyl alcohol-phthalic anhydride were prepare…
In this paper the authors present two procedures for the analysis of polymer nanocomposites. The first one uses a two dimensional surface profile to quantify the volume of eroded material and the erosion depth caused by surface discharges. The second one introduces the focused ion beam (FIB) as a new way of microscopi…
Partial discharges may cause damage to electrical insulation of high voltage equipment. They initiate elastic waves in the insulating material, e.g. in the stress cone of an outdoor termination. Localisation of the origin of such elastic waves can help to predict serious damaging processes in the electrical insulation…
We show that contact properties of chemical vapor deposition (CVD)-grown graphene to metal electrode can be improved with Ar plasma treatment before metal electrode deposition. The Ar plasma treatment reduced the baseline signal of the Raman spectrum of graphene without changing main peaks of 2D and G peak and increas…
Pre-mixed NiZn ferrite/MWNT, according to the weight ratio 1:1, were incorporated into the thermoplastic natural rubber nanocomposite by melt blending process. The effect of different filler loadings (2-10 wt%) on reflection loss and shielding effectiveness of the obtained composites were studied. It was found that bo…
In this study, devulcanised ground fluoroelastomer (FKM) ultrafine powder with the sol fraction of 19·8% and the average particle size of ∼1 μm or less was successfully prepared by solid state mechanochemical milling at ambient temperature. This reclaimed FKM can be used as a low cost but effective functional additive…