Materials Literature
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The authors report enhanced ultraviolet electroluminescence at room temperature from a diode structure consisting of vertically oriented ZnO nanorod arrays grown on a p-typed silicon substrate. Excitonic emitting peak at wavelength of 385nm with a full width at half maximum (FWHM) of 23nm and a defect-related visible…
Amphiphilic star-like macromolecules and amphiphilic scorpion-like macromolecules are polymeric micelles capable of water-solubilizing hydrophobic molecules for intravenous injection. In this work, four different amphiphilic macromolecules (M12P5, M6P5, NC12P5, NC6P5) were evaluated using human primary cell lines of t…
Abstract By means of electron backscatter diffraction, orientations are determined on a regular grid on a polished section of a copper specimen after tensile deformation to 25 %. Individual grains separated by boundaries with disorientation angles above 7 are identified and the microtexture in the form of the orientat…
Changes in energetic and structural characteristics of benzene, methanol, and ethanol molecules at their adsorption in nanosize slit-like pores of active carbon are estimated in quantum chemical calculations in the density functional approximation. The most energetically favorable arrangement of benzene molecules is f…
The seasonal succession of algal species in the epipelon of shallow, mesotrophic pond BezednĂk (Czech Republic) with special attention to diatoms (particularly Sellaphora) is described. The composition of epipelic algal assemblages changed over time in both higher taxonomic groupings and species representations. Spri…
The nanoscale structural features in a composite (gel film of Acetobacter Xylinum cellulose with adsorbed silver nanoparticles, stabilized by N-polyvinylpyrrolidone) have been investigated by small-angle X-ray scattering. The size distributions of inhomogeneities in the porous structure of the cellulose matrix and the…
Motivated by problems in the mathematical theory of liquid crystals and of superconductivity, we consider the problem of minimizing the L2 norm of curl of vector fields on a three dimensional multiconnected domain with prescribed tangential trace on the boundary. The existence and estimate of the minimizers are proven.
The objective of this study is to synthesize and characterize different nanoporous structures by chemical etching. The experiments are conducted on three different materials. 6 carat white gold leafs (Au∕Ag alloy, 1:3 ratio by weight) are etched by nitric acid to obtain nanoporous gold structures. During etching, the…
The formation and growth of calcareous deposits on 316L stainless steel and copper under cathodic polarization in artificial seawater were investigated by electrochemical tests and analytical techniques such as SEM, EDX and XRD. The deposits mineral compositions were related to the types of metallic materials and were…
The ball-on-three-balls (B3B)-test is a biaxial strength test for brittle materials. The results of B3B-tests are very stable against small geometrical inaccuracies of the specimens or the test support. In contrast to conventional bending tests there exists only a small influence of friction and edge defects are not r…
Microstructure and electrical properties of hydrogenated nanocrystalline silicon (nc-Si:H) film deposited on glass substrate at low temperature were characterized by average grain size, crystallinity, and dark electrical conductivity data obtained from the Raman and electrical conductivity spectroscopy, respectively.…
Low temperature CH 4 oxidation was studied on 2 nm gold nanoparticles supported on various metaloxides. The differences in reaction rates for the different systems suggest that the support material has an effect on the activity. From TEM analysis, we found that the gold particles were stable in size during the reactio…
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Bhabha Atomic Research Centre, Mumbai, India designed and developed a telecobalt unit, which was named as Bhabhatron-II. In this paper, the results pertaining to radiation safety of indigenously developed Bhabhatron-II telecobalt unit are reported. The various tests were carried out as per requirements of Internationa…
Highly oriented transparent (Sr,Ba)Nb 2 O 6 (SBN) ceramics were prepared to obtain excellent electrooptic properties and a high spontaneous polarization, such as those observed in a Sr 0.75 Ba 0.25 Nb 2 O 6 (SBN75) single crystal. As a result of slip casting at a high magnetic field of 12 T and firing at 1460 °C for 4…
Textile modification for achieving materials for human performance (medical, protective and sports) is one of the guidance for future textile development in Europe. The present paper shows results of the modification of polyester surface with nanoparticles of activated natural zeolite for achieving better ultraviolet…
The phonon-dispersion relations of LaAlO 3 crystal are calculated using the first-principle calculations. The first-order Raman spectra in the LaGaO 3 were measured in the temperature range of 20–300K for the rhombohedral phase. The temperature dependence of the linewidth of the A lg (132 cm -1 ) and that of E g (489…
This paper predicts the elastic and thermodynamic characteristics of TiB 2 crystal through the method of density functional theory within the generalized gradient approximation (GGA). The five independent elastic constants ( C ij ), the bulk modulus ( B 0 ), the dependence of bulk modulus ( B 0 ) on temperature T and…
Sodium tungstate in the presence of Zn2+ ions is used to function as the corrosion inhibitors in the corrosion of mild steel. However, in view of the toxicity of Zn2+, focus is now shifted to low- Zn2+ or no- Zn2+ formulations. In order to reduce the concentration of Zn2+ in Sodium tungstate- Zn2+ formulations, a seco…
(1− x )K 0.5 Na 0.5 NbO 3 – x K 3 Li 2 Nb 5 O 15 (KNN–100 x KLN) ceramics were prepared by the solid‐state reaction method. The results showed that small amount of KLN ( x ≤0.02) incorporated into the lattice and formed a single phase perovskite structure. The KLN modification lowered the phase transition temperature…