Materials Literature
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Diamond thin films were deposited on WC–Co substrates by hot filament chemical vapor deposition to improve the tribological performance. The influence of the substrate surface topography was found to play an important role during the nucleation stage and the later growth rate as well. In this study, we systematically…
In this study, luminescent CdSe quantum dots (QDs) were modified with L-cysteine and used as a sensitive sensor for the detection of lead ion. The fluorescence of the water soluble QDs can be quenched only by Pb2+ in Kolthoff buffer solution. The optimum experimental conditions were as follows: pH=8·0, 8·0 × 10−4M L-c…
Plasma irradiation impact on a SiO 2 -hardmask/SiOCH low- k film stacked structure was investigated in detail. The plasma irradiation induces damage to the low- k film although it is covered by a hard mask. The hard-mask-through UV-light-induced damage showed plasma source gas dependence. The damage is determined by t…
Solar photo-thermal collectors were prepared from pure diamond-like carbon (DLC) thin films on aluminum substrates. By only changing the deposition conditions (different bias voltage) of the DC PECVD process, coatings were fabricated consisting of five sublayers with the necessary optical parameters. As expected, abso…
The synergetics concept used for unified description of metals behavior for in-service fatigued aircraft structures. The metals evolution has considered as cascade of bifurcations in self-organized manner of energy adsorption having strongly expressed order in sequence of changing under wide range of multi-parametric…
Y 2 O 3 :Eu nanopowders were synthesized by urea combustion method containing different concentration of Eu . The synthesized Y 2 O 3 :Eu nanopowders were characterized by X-ray diffractometry, scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy…
Bismuth ferrite powders were synthesized by a simple citric acid complexing co-precipitation method at much lower temperature of 600°C. The work studies the calcination temperature and molar ratio of Fe and Bi on the structure and morphology. The as-prepared BiFeO3 powder was characterized by X-ray diffraction, field…
In present work, a ring-type unipoled step-down piezoelectric transformer with the dimensions of Phi16x0.7 mm(3) was designed and fabricated using relaxor ferroelectric single crystal (1-x)Pb(Mg(1/3)Nb(2/3))O(3)-xPbTiO(3) (PMN-PT). Both the input and output parts of this transformer were poled along the thickness dire…
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Dielectric -relaxation connected with reorientations of the 4-cyano-3-fluorophenyl-4-butylbenzoate molecules around short axes in the isotropic and nematic phases is presented. In the nematic phase the super-Arrhenius temperature dependence of the relaxation has been found. Vitrification of the supercooled nematic pha…
We analyse the thermal properties of a harmonic chain with weak correlated disorder. With the use of a perturbative approach we derive analytical expressions for the time evolution of the chain temperature and of the heat flow when both ends of the chain are coupled to heat baths. Our analytical and numerical results…
Thermoluminescence (TL) mechanisms of neutron-irradiated α-Al2O3 at 20 K is reported. The TL glow curves of neutron-irradiated and γ-ray-irradiated α-Al2O3 were observed. The TL emission bands near 340, 430, 530 and 694 nm were observed in the neutron-irradiated α-Al2O3. The γ-ray-irradiated α-Al2O3 only showed the TL…
Spherical carbon coated iron particles of nanometric diameter in the 5-10 nm range have been produced by arc discharge at near-atmospheric pressure conditions (using 5-8 x 10(4) Pa of He). The particles exhibit a crystalline dense iron core with an average diameter of 7.4 +/- 2.0 nm surrounded by a sealed carbon shell…
Ni-Zn spinel ferrite and Cu-doped spinel ferrite were prepared by a conventional ceramic processing method. Microwave absorption, complex permittivity and permeability of the (Ni0.5Zn0.5)Fe2O4 and (Ni0.4Cu0.2Zn0.4)Fe2O4 spinel ferrites within the frequency range of 0.5-18 GHz were investigated. The reflection loss cal…
The latest biennial conference of the Electron Microscopy and Analysis Group (EMAG) of the Institute of Physics was held at the University of Sheffield on 9–11 September, 2009. In addition, the Advanced School associated with the conference was run at the University of Sheffield on 8 September. It was particularly ple…
The dependence of the internal residual stress in thin diamond-like carbon films grown by the plasma-enhanced chemical vapor deposition technique on the most important growth parameters, namely, the radio-frequency (RF) power and direct-current (DC) bias voltage, was studied. It was shown that the compressive stress r…
Calculations of linear thermal expansion coefficients have been carried out using ab-initio molecular dynamics with a small cell containing only ten atoms, which is a suitable cell size for materials design. The perovskite oxides of SrTiO 3 , BaZrO 3 , LaNiO 3 , CMgO 3 , CCaO 3 , and LaCoO 3 were selected as the refer…
Abstract The poly(3‐hydroxyoctanoate) (PHO) is a biodegradable polyester containing hydrophobic side chains. One way to obtain more hydrophilic polyester consisted in the introduction of polar groups in the side chains. Carboxyl groups (PHO 75 COOH 25 ) were introduced by chemical modifications. The role of carboxyl g…
As the size of a free-standing crystal approaches a few tens of nanometers, the image force experienced by a dislocation can exceed the Peierls force. This will lead to dislocations leaving the nanocrystal without the application of an external stress and thus making it dislocation free. In this investigation a finite…
Phase transformations in microcrystalline cellulose (MCC) were studied following dissolution of 5, 10, and 20 wt. % MCC in the ionic liquid 1-butyl-3-methylimidazolium formate (BMIMFmO) and regeneration via water. BMIMFmO was found to be useful as a non-derivatizing solvent for cellulose without the need for any pre-t…