Materials Literature
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Experimental results of studying the behaviour of dielectric constant under the phase transition into paraelectric state in 10/100-Y/Y PLLZT solid solutions are presented. The investigations are performed on the solid solutions located within the regions of uniphase FE or AFE state of the phase diagrams, as well as on…
Abstract The structure and dynamics of silica and acrylamide gels were studied using a probe diffusion technique of dynamic light scattering (DLS). Latex particles, diameter = 0.05 μm, embedded in the gel network serve as a probe through their diffusion behavior within the network. A quantitative analysis of the homog…
In situ FTIR spectroelectrochemical experiments have been carried out on Cu2+-ZSM-5 with 40 and 100 % ion exchange level with Nafion films coated on glassy carbon electrodes, and on the application of these electrodes to the interaction of NO with the electrogenerated species in aqueous solution. Voltammetric results…
Reaction between tetramethylammonium fluoride (CH 3 ) 4 NF and MoO 3 in 1:1 molar ratio in the minimum amount of dry acetonitrile gives tetramethylammonium trioxyfluoromolybdate (VI), (CH 3 ) 4 N[MoO 3 F] in very high yields. The compound has been characterized by elemental analyses and IR spectral studies. The advant…
Abstract We investigated detailed conditions for synthesizing the tubular form of MCM‐41 mesoporous aluminosilicate. The method is the delayed neutralization method in which the rate of neutralization is one of the controlling factors. Rapid neutralization results in the particulate form while gradual neutralization l…
Langbeinite is a soluble potassium‐magnesium sulfate mineral (K2SO42MgSO4) found as an evaporite in many regions of the world. Langbeinite was used as a reclaiming material in a fine textured (clay loam) saline sodic soil (Grabe Series). This amendment can be dissolved and directly into the irrigation water, displacin…
Recombinant Escherichia coli strains harboring heterologous polyhydroxyalkanoate (PHA) biosynthesis genes were shown to accumulate unusually large amounts of PHA. In the present study, integrated cellular responses of metabolically engineered E. coli to the accumulation of poly(3-hydroxybutyrate) (PHB) in the early st…
Isothermal calorimetry and X-ray diffraction analyses were used to investigate the hydration of tricalcium aluminate (3CaO·Al 2 O 3 ) in 0·5, 1·0 and 3·0 M magnesium sulphate solutions. Hydration was carried out isothermally at temperatures ranging from 30 to 80°C. Monosulphate (Ca 4 Al 2 (OH) 12 ·(SO 4 )·6H 2 O), ett…
Formation of the nacre of a shell is mimicked here to synthesize layered polymer/calcium carbonate composites such as that shown in the Figure. The combination of insoluble chitin or chitosan solid matrices with soluble acidic macromolecules such as poly(acrylic acid) is used to induce thin-film crystallization of CaC…
A hardware device and software based on image analysis techniques are developed to detect and describe fuzz on fabric surfaces. Thin optical slices near the surface of fabrics are imaged with a microscope objective lens and electronic camera. Sharply focused fuzz fibers are detected within each image and described in…
A review of recent developments in the applications and actions of intumescent fire-retardance is given. An attempt has been made to classify the main systems of importance such as melamine, ammonium polyphosphate, melamine phosphate, pentaerythritol phosphate, sodium silicate, vermiculite, expandable graphite and mic…
While crystal structure analysis remains the most powerful analytical tool for the elucidation of host-guest structures, a greater understanding of the behaviour of these compounds is achieved by studying their thermal stabilities and kinetics of formation and desolvation. Various analytical techniques for the study o…
Inhibition of the corrosion of mild steel in 1‐5 N HCl and H 2 SO 4 by a macrocyclic compound viz., tetramethyl‐dithia‐octaazacyclotetradeca hexaene (MTAT) was studied as a corrosion inhibitor by weight loss and electrochemical potentiodynamic polarization methods. The influence of temperature, immersion time and acid…
The electrical conductivity in a metal-polymer-nanocrystalline metal system has been investigated as a function of temperature. It is found that this system undergoes a transition to the high-conductivity state at temperatures of structural transformations in nanocrystalline electrodes. The results are interpreted wit…
Ring-opening polymerization of cyclic carbonates was studied. Volume expansion during polymerization of cyclic carbonates could be explained by the difference between intermolecular interaction of monomers and polymers, which was evaluated by dipole moment. A seven-membered cyclic carbonate polymerized much faster tha…
Selective modification of zirconium alkoxide by acetic acid or acetylacetone was used in solution processing of PZT Pb(Zr, Ti)O3 thin films by 2-methoxyethanol route. EXAFS results clearly show a decrease of Zr-O-Zr links in the acetic acid modified PZT sol implying a more homogeneous constituent metal distribution. N…
An investigation into the cleanness of steel manufactured by a major Scandinavian producer of steel for railway wheels has been carried out. Samples taken before and after secondary refining in the ladle and after degassing were compared with samples taken similarly from a heat including the addition of a calcium carb…
The cutlery & Trades Research Association (CATRA) has recently concluded a two year research project, funded by the Department of Trade and Industry Focus Technology Programme, to review the sharp edge retention of hand held and machine knives and blades. Results for sharpness and wear performance of cutting edges…
The optical energy band gaps of BaAl2S4 and BaAl2Se4 single crystals at 300 K were found to be 3.98 and 3.35 eV, respectively, and the optical energy band gaps of Ho3+, Er3+, and Tm3+-doped BaAl2S4 and BaAl2Se4 single crystals were smaller than those of the undoped single crystals. Photoluminescence spectra peaked at…
Petroleum reserves of the world may not last forever. There is a need to develop alternative and renewable sources of petroleum. Petrocrops (wild and waste plants) are renewable sources of petroleum hydrocarbons. Calotropis procera is one of the potential candidates for petrofarming. The latex obtained from C. procera…