Materials Literature
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Patterns of plastic deformation of nanocrystalline (NC) technical grade VT1-0 titanium, are studied in quasi-static tensile experiments, with the average size of the grain d, ranging from 35 nm to 2 μm, at the temperature interval 4.2 K < T < 395 K. The wide range of grain size, and grain size distribution, was made p…
The piezoelectric properties of (100)-orientated BiFeO 3 thin films grown on (100)LaNiO 3 /SiO 2 /(100)Si were investigated. 200-nm-thick LaNiO 3 and 250-nm-thick BiFeO 3 was deposited by the rf magnetron sputtering method and sol–gel method, respectively. The (100)-oriented BiFeO 3 films were distorted to the in-plan…
Effect of a glow discharge on the ferritization process in the Fe2+-Ni2+-SO4 2−-OH− system was studied. The phase and granulometric composition of the samples synthesized was determined. The crystal lattice constants and the crystallite size were found to depend on the synthesis conditions. The main magnetic character…
The spectral-luminescent properties of the synthesized bismuth-containing quartz-like glass exposed to heat treatment have been studied. The appearance of the thermoinduced bismuth centers of luminescence, which are the result of the reduction of Bi3+ ions, has been observed. It has been shown that the reduction of Bi…
The effect of electrolytes with single-, double- and triple-charged counterions, as well as cationic (cetyltrimethylammonium bromide) and anionic (sodium dodecyl sulfate) surfactants, on the electrokinetic potential of multiwall carbon nanotubes prepared via catalytic pyrolysis of propylene in a gas phase according to…
Article Invité
The present study deals with the complexation properties of Guaifenesin with two types of acceptors: σ-acceptor (i.e., iodine) and π-acceptors (i.e., dichlorodicyanobenzoquinone, chloranil and picric acid). All the prepared complexes were characterized stoichiometrically and structurally using various spectral techniq…
Foreign object‐damage ( FOD ) phenomena of an N720/alumina oxide/oxide ceramic matrix composite ( CMC ), impacted by 1.59‐mm spherical chrome steel projectiles up to Mach 1, were assessed at ambient temperature at a normal incidence angle in both partial and full supports. The impact damage was in the form of craters,…
In both theoretical and applied mechanics, the modeling of nonlinear constitutive relations of materials is a topic of prime importance. To properly formulate consistent constitutive laws some restrictions need to be imposed on tensor functions. To that aim, representations theorems for both isotropic and anisotropic…
We report a maximal figure of merit (ZT) value of 1.1 at 600 K was obtained for the sample of which x = 0.03, representing an enhancement greater than 20% compared with a pristine AgSbTe2 sample. This favorable thermoelectric performance originated from the optimal Sn2+ substitution for Sb3+ in AgSbTe2, which not only…
Ceramic nanocomposites, containing at least one phase in the nanometric dimension, have received special interest in recent years. They have, in fact, demonstrated increased performance, reliability and lifetime with respect to monolithic ceramics. However, a successful approach to the production of tailored composite…
Various bulk and transparent glasses were prepared by rapid melt quenching technique in the glass system 55[(Pb x Bi 1− x )TiO 3 ]-44[2SiO 2 B 2 O 3 ]-La 2 O 3 ( x = 0–0.7). The X-ray diffraction (XRD) studies of the glass samples confirmed the amorphous nature. The differential thermal analyses (DTA) were carried out…
Ultrafast charge-transfer dynamics has been demonstrated in CdSe quantum dots (QD), CdSe/ZnS type-I core-shell, and CdSe/CdTe type-II core-shell nanocrystals after sensitizing the QD materials by aurin tricarboxylic acid (ATC), in which CdSe QD and ATC form a charge-transfer complex. Energy level diagrams suggest that…
Fluorescence correlation spectroscopy (FCS) is a standard tool for studying diffusion of molecules in solution, but is limited to low analyte concentrations, in the range between 10 pM and 1 nM. Such concentration limitations can be overcome by using a plasmonic nanoantenna which confines the electric field of excitat…
IR-spectra of a great number of samples of detonation nanodiamonds (DND) obtained under different conditions (with dopants added or with the use of reducing agents) have been analyzed for the first time. The quantity and type of incombustible impurities have been found to have no effect on the pattern of IR spectra. I…
A review of data on the thermo, photo-, and biodegradation of compositions of synthetic polymers with poly-3-hydroxybutyrate and poly(lactic acid) is presented. The influence of these polymers on the thermal, microstructural, and rheological properties of mixtures is examined. The destruction of pure biopolymers, as w…
A boost converter for thermoelectric energy harvesting in 130nm CMOS reduces the achievable input voltage by 50% to 10mV, which allows wearable body sensors to continue operation with thermal gradients below 1oC. The design uses a peak inductor current control scheme and duty cycled, offset compensated comparators to…
The electrical resistance of Gd x Mn1 − x S solid solutions with x = 0.1, 0.15, and 0.2 has been measured at magnetic field H = 0.8 T and at zero magnetic field within the 100 K < T < 550 K temperature range. The magnetoresistance peak is observed above room temperature. On heating, the composition with x = 0.2 exhibi…
Thiourea-Formaldehyde polymer (T-F Polymer) was synthesized by microwave method and its inhibitive action on the corrosion of mild steel (MS) in 1 M HCl was investigated under different experimental conditions using weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization technique. T…
Er(3+) doped nanocrystalline powders are extensively used for thermometry based on luminescence spectral analysis. The luminescence from Er(3+) is produced by a nonlinear (two-photon) absorption process which may generate strong internal heat by activation of nonradiative relaxation channels. If the heat dissipation i…