Materials Literature
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Two kinds of solidification paths from Y3Al5O12 melt has been reported; one is stable Y3Al5O12 (YAG) garnet, the other is metastable YAlO3 perovskite (YAP) and subsequent YAP+Al2O3 eutectic. The reason for this, however, has been puzzled. The effect of cooling rate on this phase selection was addressed under container…
The photoluminescence (PL) around the wavelength of 1.54 μm from the Er-containing ZnO specimens was measured at room temperature by the indirect excitation of the He-Cd laser (325 nm). The PL intensity varied greatly with the Er concentration and the specimen preparation conditions as well. The specimens with the Er…
We investigate the effect of changing the molecular dipole strength on the liquid crystal phases formed in a system of tapered Gay-Berne particles with an axial dipole. We show that increasing the strength of the dipole has a profound effect on the stability and molecular organisation of the phases and eventually dest…
The production of uranium nitride fuel depends upon a qualified and controlled method for obtaining a final fuel form. The final fuel form must have the desired properties, fuel density, fuel chemistry (X/U ratio), and impurity levels. These properties must be maintained throughout the entire fuel fabrication process…
Synthetic Mg/Zn/Al -hydrotalcites with atomic ratios of 6:0:2, 4:2:2, 2:4:2 and 0:6:2 were characterized by FT-Raman and FT-IR spectroscopy. ‘Al--OH’ IR translation modes are observed at 419, 427, 559, 616 and 771 cm −1 with two corresponding Raman bands at 465–477 and 547–553 cm −1 . ‘Mg--OH’ IR translation modes are…
One of the best ways to combat chrome pollution is to avoid chromium itself in tanning. With this view, a chrome-free combination tanning system has been established using aluminium, tannic acid, a precursor to vegetable tannins and silica. Since tannic acid has low molecular weight compared to vegetable tannins, it c…
The synthesis of new Tb- and Eu-containing LDH-based luminescent hybrid materials with quantum yields up to 45% is described; energy transfer studies in corresponding mixed Tb3+/Eu3+ systems revealed highly efficient ligand→Tb3+/Eu3+ and Tb3+→Eu3+ communication channels.
A rapid solidification process was found to form unidirectional crystal structures in (Bi,Sb)2Te3 and (Bi,Sb)2(Te,Se)3 based thermoelectric alloys. This fine microstructure with its unidirectional crystal orientation is expected to yield high value thermoelectric properties because the fine grain size is extremely eff…
Algunos suelos alrededor de Chennai, Tamil Nadu están representados por horizontes de ferricreta, que pueden estar relacionados con el lecho rocoso subyacente. En el presente estudio, los Suelos Rojos y las ferricretas han sido estudiados en cuatro diferentes sitios: Red Hills, Vaiyapur, Uttukkadu y Pallavaram, que fu…
It is well known that the macromolecular structure and the microstructure of the fillers play an important role in the mechanical properties of filled rubbers. This paper focuses on the dependence of the complex modulus of aged natural rubber vulcanizates on the filler network and polymer structure. Dynamic mechanical…
HEC-g-AA/SiO2 hybrid materials are prepared through a graft copolymerization reaction between acrylic acid (AA) monomer and hydroxyethyl cellulose (HEC), in the presence of a silica sol. The microstructure and properties of the hybrid materials are characterized by Fourier transform infrared spectra (FTIR), differenti…
Structural changes in NiTi Shape Memory Alloys (SMA) subjected to Low Temperature Thermomechanical Treatments (LTMT) with subsequent Post-Deformation Annealing (PDA) are studied by X-ray and transmission electron microscopy (TEM) analyses. The influence of these structural changes on the mechanical behaviour of the tw…
Abstract Summary: Blends of poly(propylene) (PP) were prepared with poly[ethylene‐ co ‐(methyl acrylate)] (EMA) having 9.0 and 21.5% methyl acrylate comonomer. A similar series of blends were compatibilized by using maleic anhydride grafted PP. The morphology and mechanical properties of the blends were investigated u…
The electrical deposition(electropolymerization)of polypyrrole, PPy, grafted by different ODN probes is the key to construct oligonucleotides, ODN, arrays on silicon devices bearing a matrix of gold microelectrodes. The straightforward functionalization of PPy allows finalizing a more general grafting based on affinit…
This paper focuses on no-load iron losses of turbine generators. To calculate iron losses of turbine generators a program was developed. In the program, core loss curves of materials used for stator core were reproduced precisely by using tables of loss coefficients. Accuracy of calculation by this method was confirme…
Abstract The effect of supercritical carbon dioxide (scCO 2 ) on the interfacial tension between a polymer melt pair—polystyrene (PS) and low density polyethylene (LDPE)—was studied using the pendant drop method at temperatures varying from 200 to 240°C and CO 2 pressures up to 18 MPa. The LDPE melt was prepared in a…
Quantum Rice Ramsperger Kassel (QRRK) calculations are carried out to calculate the pressure-dependent rate constants of reactions involving SiH4 as an association product. It is shown that good estimates of pressure-dependent rate constants can be obtained from QRRK in spite of the very poor treatment of the activate…
AIM: To investigate the photocatalytic killing effect of photoexcited TiO2 nanoparticles on human colon carcinoma cell line (Ls-174-t) and to study the mechanism underlying the action of photoexcited TiO2 nanoparticles on malignant cells.METHODS: Ls-174-t human colon carcinoma cells were cultured in RPMI 1640 medium s…
Introduction The US Department of Energy has recently issued a Grand Challenge in Hydrogen Storage. The ambitious goals for volumetric and gravimetric densities and the controlled release of H2 from materials at temperatures below 80 oC contained within this Grand Challenge demand the discovery of new materials and ca…
It is believed that space charge buildup in cross-linked polyethylene (XLPE) insulation is one of the main cause for premature failure of underground power cables. The space charge activities in XLPE depend on many factors such as additives, material treatment, ambient temperature, insulator/electrode interface, etc.…