Materials Literature
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The design of composite materials leads to the development of multi-component systems where each constituent has a specific function in the material, from technological and/or application points of view. Examples of such composite systems are the cordierite-mullite refractory materials investigated in this contributio…
The structural and magneto-optical properties of “porous silicon-cobalt” nanocomposites prepared through electrochemical deposition on silicon substrates of different porosities are investigated. It is revealed that, under galvanostatic conditions, cobalt micrograins are formed only in a surface layer of porous silico…
The Fe-Mo/ZSM-5 catalysts were prepared by an impregnation method. A comparison of the catalytic activity for the reduction of NOx with ammonia over Fe-Mo/ZSM-5, Fe-ZSM-5 and Mo/ZSM-5 catalysts was carried out. Also, the effects of the conditions used for calcination as well as of the Fe/Mo ratio on the catalytic perf…
The theoretical and experimental investigation of ferroelectric nanopowders is performed. The manifestation in radiospectroscopy spectra of size driven ferroelectric-paraelectric phase transition at some critical particle average size R = R c was the main goal of the consideration. In theoretical part the size effect…
Lead-zirconate-titanate (PZT) ceramics with zirconate-titanate (65:35) have been synthesised with the substitution of lanthanum (6, 7 and 8 mol %). Samples were prepared by solid-state reaction route.The x-ray diffraction study shows the formation of a single phase with rhombohedral structure. There is a transformatio…
Using a newly developed pulsed dc sputtering source with unbalanced magnetrons, we deposited advanced inorganic functional thin films such as TiO2, TiN, and TiO2∕TiN∕TiO2 on glass at 200°C at rates 3 to 4 times greater than those deposited by conventional dc sputtering. The TiO2(101) and TiN(100) thin films were stoic…
The infrared transmittance spectra and dark conductivity of wafers fabricated from nanocrystalline silicon powder ( nc -Si) have been studied. The initial nc -Si powder is first synthesized by laser-induced silane dissociation, with the temperature of the surrounding buffer gas varied from 20 to 250°C, and then compac…
X-ray spectroscopy has been used to obtain data on the local electronic and atomic structure of a -Si x C 1− x :H(Er) alloys produced by plasma-enhanced chemical vapor deposition (PECVD) with various relative amounts of silane and methane in the gas mixture ( x =0.3–0.9). It is shown that the alloys contain silicon an…
In this work, aniline was polymerized directly to the polyaniline‐sulfate salt without using a protonic acid. The polyaniline‐sulfate salt was prepared by emulsion polymerization, using a non ionic surfactant such as poly(ethylene glycol)–block poly(propylene glycol)‐block poly(ethylene glycol). In the aniline oxidati…
A molecular modelling capability for predicting the purity and morphology of solids manufactured via crystallisation is important in the realisation of a ‘molecule-up’ or product-centred, approach for the optimisation of chemical processes. Recent work on producing the morphology of molecular solids based upon the mol…
New vacuum gauges with emitters based on carbon nanotubes (CNTs) are described. The relation between the field emission from CNTs and the residual pressure in the vacuum chamber is considered. The operation of the proposed pressure sensor obeys the electric discharge theory based on the Paschen law, whereby the pressu…
The decomposition of hydrogen peroxide catalyzed by mixed ligand cobalt (II) and nickel (II) complexes as heterogeneous catalysts and adsorbate on alumina has been investigated by measuring the evolution of oxygen at different time intervals between 35-60°C. The effect of variation in the concentration of hydrogen per…
A conducting composite of polythiophene (PTh) with polyacrylamide (PAA) as the insulating matrix was prepared via electrochemical methods. The change in the conductivity of composites was analyzed as a function of the percent composition of the insulating component. The characterization of the composite was done by FT…
Hydroentanglement is the fastest growing bonding method in the nonwoven arena. Its strengths are good fabric aesthetics, and the lack of any complex binder chemistry with its inherent environmental concerns. Hydroentanglement is used for mechanically bonding both staple and filament nonwovens as well as being used for…
With the aim of obtaining syndiotactic‐polystyrene (s‐PS) fibers with well developed fiber structure, sheath‐core bicomponent fibers consisting of s‐PS and atactic‐polystyrene (a‐PS) were prepared through high‐speed melt spinning. The bicomponent spinning provided significant improvement of spinnability in comparison…
A study has been made of the individual and combined roles of nitrogen dioxide (NO2) and sulfur dioxide (SO2) atmospheric pollutants on corrosion and patina formation on copper in atmospheres with comparatively low water contents (70% and 50% relative humidity [RH]) for exposure times of up to 28 days. X-ray photoelec…
Self-assembled In0.79Mn0.21As quantum dots were successfully grown on GaAs (001) substrates by low-temperature molecular beam epitaxy. Atomic force microscopy and high-resolution transmission electron microscopy confirm the formation of quantum dots. High-resolution lattice image suggests that In0.79Mn0.21As dots are…
Chiral mononitroxide-, dinitroxide-, tetranitroxide- and hexanitroxide- cyclotriphosphazene hybrid compounds, along with a chiral 2,2′-bridged trinitroxide-bis(cyclotriphosphazene) hybrid compound, have been prepared to examine the potential use of the cyclotriphosphazene framework as a molecular scaffold for elaborat…
Al 1− x Ga x PO 4 solid solutions ( x = 0.3, 0.7) with the α-quartz-type structure were investigated up to 1208 K by x-ray powder diffraction. The composition Al 0.7 Ga 0.3 PO 4 exhibits almost simultaneous transitions to the β-quartz and β-cristobalite forms at close to 1050 K. The tendency towards the β-quartz type…
We investigated the electrical erasing of information recorded by a holographic method in an amorphous As 40 Ge 10 Se 15 S 35 chalcogenide thin film. Even though the amplitude of photoinduced birefringence (Δ n ) strongly depends on applied DC voltage ( V DC ), the kinetics exhibits a tendency. For V DC =0–3 V, Δ n in…