Materials Literature
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Pt/Ru-doped ZnO nanophase particles were synthesized using ultrasonic spray pyrolysis. Particles were obtained through decomposition of zinc nitrate and newly developed Pt(IV) and Ru(III) complexes. The particle morphology, phase composition and chemical structure were revealed in accordance to various analysis method…
Films of Poly (methyl methacrylate) filled with different contents of iodine were prepared using the casting technique. The results, obtained by DSC, indicate that, increasing the iodine content leads to a decrease in both Tg and TD of the PMMA films. The UV/VIS spectral analysis for the present system suggests that t…
Crystalline calcium titanate was synthesized by mechanical activation of a mixture of CaO, obtained by thermal treatment of CaCO3, and TiO2 in anatase or rutile form, in a planetary ball mill for 30, 60, 120 and 240 min.. The effect of milling on the solid-state reaction was followed by X-ray diffraction. Changes in p…
The hydrogen storage performances of Mg-C nanocomposites have been studied on materials synthesized by ball milling with and without addition of an organic additive. The main purpose of this work is to study in more detail the cooperative effect observed when both graphite and benzene are added to the milled blend. In…
Abstract We followed crosslinking reactions in the blends of two miscible reactive polymers by either torque rheometry or dynamic rheological measurements. Functional polymers with controlled glass‐transition temperatures ( T g 's), chain lengths, and number of reactive groups per chain were synthesized by bulk radica…
Early stages of hot-electron thermalization in small gold nanoparticles wrapped in an adsorbates shell have been investigated by femtosecond transient absorption spectroscopy. Type-I hot electrons thermalize in 800 fs (to form type-II hot electron) either by scattering with cold conduction band electrons or by chemica…
Mercury is a common pollutant in natural water. Several chelating agents have been used to treat mercury poisoning. Among these agents British-anti-Lewisite (dimercaprol, 2,3-dimercapto-1-propanol, BAL) is a particularly successful antidote to inorganic mercury poisoning. In the present study a conductometric electroc…
Employing ab initio calculations, the relative stabilities of the possible crystalline structures at compositions of CoTa 3 , Co 3 Ta and CoTa were predicted and based on thermodynamic calculations, the possible structural phase transitions were predicted over a broad composition range for the metastable crystalline C…
This paper deals with the control of the adhesion strength in metal-elastomer joints by fillers and the use of rubber blends to produce advanced high performance adhesive systems. The curing behavior of rubber compounds and dynamic mechanical properties of crosslinked rubber composites were considered in this technolo…
Recent experimental characterization of alkali-metal atom adsorption in single-wall carbon nanotubes showed a softening of the Raman modes. To gain insight into the effects of K, Rb, and Cs doping, we report first-principles calculations of the Raman radial breathing and tangential $G$ modes. Structural parameters and…
Most mutations in the yajC-secDF operon identified via genetic screens confer a cold-sensitive growth phenotype. Here we report that two of these mutations confer this cold-sensitive phenotype by inactivating the SecDF-YajC complex in protein translocation.
This investigation and morphology analysis of porous structure of some kinds of natural materials such as chicken eggshell, partridge eggshell, pig bone, and seeds of mung bean, soja, ginkgo, lotus seed, as well as the epidermis of apples, with SEM (Scanning Electronic Microscope) showed that natural structures’ pores…
Macroporous cross-linked copolymer of 4-vinylpyridine and 25% (4:1) divinylbenzene is analyzed under open conditions, that is in a continuous well-stirred tank reactor (CSTR). With this aim the appropriate bifurcation diagram is found and the behavior of the system with and without polymer in the vicinity of the bifur…
Lanthanum hexa-aluminate (LHA) is considered a promising material for thermal barrier coatings for gas turbine applications as well as oxidation resistant coatings for fibres in oxide based ceramic composites. Combustion synthesis has attractive advantages such as simple experimental setup, low cost, short reaction ti…
Most readers are familiar with cellular automata (CA) utilizing squares as cells, and are also familiar with the most famous automaton, Conway's Game of Life. This game is played on an infinite grid of squares, and has been thoroughly explored in many publications [1, 2] as well as on numerous websites. In 1994 in thi…
The focusing properties of a photonic-crystal (PC) slab consisting of a square lattice of rectangular dielectric rods in the air background are studied theoretically. We employ the finite-difference time-domain method to investigate the field patterns of a point source placed in the vicinity of the PC slab and find th…
We have measured a resonant Raman scattering from polycrystalline silicon (poly-Si) films with thicknesses of 24–381nm at the depth resolution of approximately 5nm and found that poly-Si films are under compressive stress. The main Raman peak in poly-Si films tends to shift to a higher frequency as the thickness of th…
The objective of the present study, an extension of a recent one, is to inter-compare the utility of the various isothermal three-parameter equations of state (EOSs) of solids, considered viable at different stages in the development of the EOS field, spanning over a period of about a century now. In a recent paper we…
Abstract Particulate‐reinforced thermoplastic composites are designed to improve the properties and to lower the overall cost of engineering polymers. In general, the performance of filled polymers is decided on the basis of the interface attraction of filler and polymers. Therefore, a coupling agent, tetra isopropyl…
Nanoscaled TiO2 powders with narrow size dispersion were prepared in supercritical carbon dioxide via non-hydrolytic acylation/deacylation of titanium alkoxide precursors with or without tris-fluorination. The microstructures of these powders were characterized by spectroscopic (FTIR, TGA, and XRD), microscopic (SEM o…