Materials Literature
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Plates prepared of diamonds from the Mir kimberlite pipe were examined with FTIR spectroscopy. It is shown that B1 defects were formed by annealing during crystal growth, whereas B2 centers arose after growth cessation. The development of B2 centers in a natural diamond is the secondary process with respect to the agg…
This paper describes Hydrogen energy in India and R&D efforts at Banaras Hindu University. All the three important ingredients i.e. production, storage and application of hydrogen have been dealt with. As regards hydrogen production, we have described and discussed the solar route consisting of photoelectrochemical el…
The corrosion behavior of Zn in 1 M HCl solution containing various concentration of Urea range (10-3→ 5x 10-3) M at temperature range (285-328) K was investigated. The corrosion inhibitive action of Urea on Zinc metal was studied using weight loss measurement and analytical titration of the amounts of dissolved Zinc…
The effect of singlet oxygen on the formation of nanoporous silicon in the case of photoelectrochemical etching of p-Si is studied. Pulsed electrolysis was used to discriminate between chemical and electrochemical processes. The pulsed etching of silicon was accompanied by pulsed illumination coinciding either with cu…
The Zn1−xCoxO and Al-doped Zn1−xCoxO nanowires have been synthesized by the water-assistance reactive vapor deposition method. No Co precipitates appeared in the both kinds of ZnO nanowires according to the results observed by high-resolution transmission electron microscope, x-ray diffraction, and electron energy-los…
The H 3 BO 3 ⇄ HBO 2 + H 2 O, HBO 2 + HBO 2 ⇄ (HBO 2 · HBO 2 ) complex, and (HBO 2 · HBO 2 ) ⇄ B 2 O 3 + H 2 O reactions of forward and reverse conversion of H 3 BO 3 into B 2 O 3 and the (HBO 2 · HBO 2 ) ⇄ (HBO 2 ) 2 reactions of forward and reverse transformation of the complex into a fairly stable dimer (HBO 2 ) 2…
Nano-powders of NiO-CeO2 and Bi2O3-CeO2 binary compounds for a promoter in the automotive three-way catalysts were synthesized by hydrothermal method. The X-ray diffraction result showed that the average particle size was in the range of 1112 nm, which was correspondence to the high-resolution transmission electron mi…
Quantum chemical study on vapor reactions of ZnO growth by metal–organic vapor phase epitaxy (MOVPE) was carried out. Especially, the reaction natures between diethylzinc (DEZn) and different oxygen sources, nitrous oxide (N 2 O) and water (H 2 O), have been comparatively discussed, in terms of the adsorption of oxyge…
Polymeric insulators being sensitive to environment need study before use in any particular environment. To study their behavior in Pakistan, an insulator was placed in a wooden box in which a UV lamp was fitted. An open cup full with water was also placed to produce humidity that varied between 49 to 71% and the temp…
Dendrigraft polysiloxanes bearing 3-chloropropyl functional groups pendant to the polymer branches of the last generation were synthesized by the graft on graft method. First, branched polysiloxanes of various topologies, star, comb, and dendritic functionalized with pendant vinyl groups, were prepared. Hydrosilylatio…
The crystal structure of the β polymorph of Pigment Yellow 181 was solved from laboratory X-ray powder diffraction data and Rietveld refined. In the crystal structure, the molecules are essentially planar, with extensive hydrogen bonding between the molecules.
Modern models of the state of disperse platinum in low-percentage industrial catalysts for production of motor fuels (reforming catalysts) are considered. The state of surface platinum atoms was assessed by means of an original approach based on division of surface centers on metallic (Pt0) and ionic platinum (Ptσ). P…
Abstract We reported a chemical approach for the in-situ preparation of conducting polyaniline (PANI)/Fe 2 O 3 composite dispersions using dodecylbenzene sulfonic (DBSA) acid both as dopant and surfactant. The PANI/Fe 2 O 3 composite dispersions were characterized by X-ray diffraction, UV-vis and FT-IR spectra and con…
Electrochemical noise (EN) measurement and electrochemical impedance spectroscopy (EIS) were employed to study the corrosion behaviour of carbon steel API 5L (X60). The base solution was deaerated aqueous 0·5M bicarbonate to which chloride ion (NaCl) was added in concentrations ranging from 0·05 to 0·3M; potentiodynam…
The field enhancement factor of gated nanotube with opened top was analytically calculated by the electrostatic method. The effect of geometrical parameters of the device on their field enhancement factor was investigated, including the gate-hole radius, gate-anode distance, and nanotube radius. The theoretical analys…
A novel hybrid sandwich-like supramolecular structure (polyelectrolyte multilayer/S-layer/ polyelectrolyte multilayer/S-layer) has been built by combining polyelectrolyte multilayer deposition and self-assembly of isolated SbpA proteins from Bacillus sphaericus CCM2177. Neutron reflectometry measurements were used to…
Abstract This paper addresses the tribological challenges involved in the machining of compacted graphite iron (CGI) through an investigation of the effects of tool material, local tool surface topography and minimal quantity lubrication (MQL) on machining performance. Turning experiments were undertaken using four di…
The optical properties of lead selenide powders are investigated by Fourier-transform IR spectroscopy at room temperature, as well as at temperatures of 500 and 550°C. The diffuse reflection spectra of the initial and heated powders of the PbSe compound are measured. It is revealed for the first time that the surface…
A new class of antifriction polymer composite materials, i.e. carbon plastics, is considered in terms of their application in machine building. They exceed traditional antifriction polymer materials in their characteristics. The use of sliding bearings made of carbon plastics in ship and energy machine building has sh…
Copolímeros elastoméricos à base de butadieno são amplamente utilizados na indústria automobilística. Dentre esses destacam-se os copolímeros de butadieno-estireno (SBR) e butadieno-acrilonitrila (NBR). O SBR apresenta maior importância comercial, devido a sua aplicação na produção de pneus. Quando SBR é utilizado jun…