Materials Literature
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Porous silicon (PS) has great potential in optical applications due to its tunable refractive index. In particular, multilayer structures consisting of alternating PS layers with different refractive indexes can be used as interference filters for applications in optoelectronics. In the present work, Rutherford backsc…
Abstract Previous studies of boric acid powder suggest that the surface undergoes restructuring when exposed to changes in relative humidity of the surrounding air. This present work investigates these surface changes using atomic force microscopy (AFM) to provide quantitative topographic information, supplemented by…
This study reports the synthesis of the 5,15-bis(4-hydroxyphenyl)-10,20-bis(4-carboxyphenyl)porphyrin (BBP) moiety, and its versatile self-assembly into multiporphyrin hydrogen-bonding ‘polymers’ in four different reaction and crystallization conditions. In two cases the polymers are sustained by characteristic interm…
The purpose of this research was to develop practical care procedures to help maintain the protective quality of flame resistant workwear laundered by workers in the field. Based on observed field conditions, experiments were conducted that simulated domestic laundry procedures. The first experiment involved two flame…
This paper presents a ferroresonant experience involving inductive voltage transformers (VTs) in a 400 kV substation. The origin of the phenomena, the conditions under it may become sustained and its effects on plant equipment are discussed. A very comprehensive analysis is performed using time domain simulations with…
The stress-driven grain boundary diffusion problem is a continuum model of mass transport phenomena in microelectronic circuits due to high current densities (electromigration) and gradients in normal stress along grain boundaries. The model involves coupling many different equations and phenomena, and difficulties su…
The evolution of the structure of zinc-substituted nickel hydroxides (α or β phases) during ageing in the KOH electrolytic medium was studied. The ageing leads to β-phases that contain zinc ions in tetrahedral sites of the interslab space, as shown by the EXAFS study. These interslab zinc ions entail in the aged mater…
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…