Materials Literature
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A review on surface modification of different polymers by treatment in oxygen plasma is presented. Plasma is created in a high frequency inductively coupled gaseous discharge at the power of about 200 W. In such discharge created in pure oxygen, plasma with the following parameters is obtained: the electron temperatur…
The present paper demonstrates how data mining techniques can be used to quantitatively assess multivariate material properties, such as electronic features and crystal structure parameters. Using AB 2 N 4 spinel nitrides as a template for the present study, the authors have assessed the statistical interdependency of…
The methods of group theory have been used to decompose the crystal structures of centrosymmetric perovskites, ABX 3 , that exhibit zone-boundary tilting of the BX 6 octahedra. For the fourteen space-groups consistent with these phenomena, the associated structures are decomposed in terms of the magnitudes of an appro…
A comparative analysis of the electron range in solids as a function of the initial electron energy (in the range 1–50 keV) and parameters of matter is performed. A relationship between the full length range of electrons and the depth of their penetration into the target material is established using simple empirical…
The structure, harmonic frequencies and vibrational mode assignments for 2-chlorobcnzoic acid (2CBA) monomer are calculated using HF and DFT methods employing the 6-311++G(d,p) basis sct. The results of the molecular structure and vibrational frequencies obtained on the basis of calculations are presented and critical…
The effect of starting powders on the sintering of nanostructured tetragonal zirconia was evaluated. Suspensions were prepared with a concentration of 10 vol.% by mixing a bicomponent mixture of commercial powders (97 mol.% monoclinic zirconia with 3 mol.% yttria) and by dispersing commercially available tetragonal zi…
An overview is presented of an approach for treating cancer that uses nanoparticles to deliver heat to diseased areas after absorbing energy from a laser of the appropriate wavelength. The implications are discussed of the relationship of parameters necessary to raise the temperature to therapeutically beneficial leve…
We describe a nanocrystal self-assembly method for the preparation of rare earth fluoride nanotube (ReF-NT) arrays and magnetite-doped rare earth fluoride nanotubes (Fe 3 O 4 -ReF-NTs) by using porous anodic aluminum oxide (AAO) as a hard template. The ReF-NTs can be simply prepared by the impregnation of α-NaYF 4 nan…
Abstract ‘Ghassoul’ clay is a Mg-rich clay from Morocco which is of great industrial use and interest, but its characterization is still incomplete. The purpose of this study was to provide further details regarding the structure and characteristics of this important commercial clay mineral. Mineralogical and physicoc…
One step (direct) and multisteps synthesis methods of metal and oxide nanoparticles are presented including both bottom-up and top-down procedures. Chemical methods involving the polyol process allows to get either isotropic or anisotropic nanoparticles. Nanowires, nanorods and dumbells can be generated either by hete…
The thermal properties of the phase-change chalcogenide alloy Ge 2 Sb 2 Te 5 in its three phases (amorphous, cubic, and hexagonal) and of Si 3 N 4 and SiO 2 have been studied to obtain reliable values for device modeling. Thermal conductivity was determined, along with a quantitative estimation of the thermal resistan…
Hot tearing, or hot cracking, is one of the most severe solidification defects commonly encountered during casting. It is such a complicated phenomenon that a full understanding is still not yet achieved, though it has been extensively investigated for decades. Most contributions are still based on qualitative charact…
We demonstrated lattice parameters of vanadium dioxide (VO 2 ) films grown on Al 2 O 3 (001) substrates across metal–insulator transition using temperature-controlled X-ray diffraction measurements. Changes in lattice length for both the monoclinic and tetragonal phases were shown against temperature. Films prepared b…
A simple approach by direct synthesis of few-layer graphene sheets and transferring them onto flexible substrate is demonstrated. The hydrogen effect on the D band intensity of Raman spectra for few-layer graphene sheets synthesized by chemical vapor deposition (CVD) on Ni -evaporated silicon substrate is investigated…
The shape memory effect and superelasticity appear in shape memory alloy (SMA). The large amount of strain by more than several hundreds percent can be recovered in shape memory polymer (SMP). The shape recovery and shape fixity can be used in SMP elements. These characteristics of shape memory materials (SMMs) can be…
The mechanisms of plastic deformation of Cr20Ni80 nichrome with an initial grain size of 80 μm were studied in the temperature range 600–950°C and the strain-rate range 1.5 × 10−6−5 × 10−2s−1. Nichrome is shown to exhibit anomalously high values of stress exponent n and a high deformation activation energy Q. These un…
The initial stage of gelation of organic-inorganic hybrid hydrogels based on poly(N-vinylpyrrolidone) and the products of hydrolytic polycondensation of tetramethoxysilane has been studied by capillary viscometry. The development of strong bonds between polymer molecules and silica particles in aqueous solutions is pr…
Abstract The AVR pebble bed reactor (46 MWth) was operated 1967 – 1988 at coolant outlet temperatures up to 990°C, which are suitable for process heat applications. Also because of a lack of other experience the AVR operation is a basis for future HTRs. This paper deals with insufficiently published but unresolved saf…
In the present work Ti-HA (3, 10, 20, 50 vol%) nanocomposites were produced by the combination of mechanical alloying and powder metallurgical process. The experimental results show, that Ti-HA nanocomposites have better mechanical and corrosion properties in comparison with microcrystalline titanium. For example: Vic…
The grain boundary diffusion (GBD) of copper in aluminum is investigated in the range t = 300−400°C. Investigations were performed on a scanning electron microscope equipped with an attachment for electron probe X-ray microanalysis. The triple product sδD gb (where s is the segregation coefficient, δ is the width of t…