Materials Literature
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A research project was carried out to study the toxic effects of Ak (Calotropis procera) crude extracts against two species of termites i.e. Heterotermes indicola and Coptotermes heimi at Nuclear Institute for Food and Agriculture (NIFA), Peshawar-Pakistan in April 2002. Results revealed that maximum mortality in case…
The discovery of novel structural and physical properties in the $A$-site ordered manganite $R$BaMn$_{2}$O$_{6}$ ($R$ = Y and rare earth elements) has demanded new comprehension about perovskite manganese oxides. In the present study, the $A$-site disordered form, $R_{0.5}$Ba$_{0.5}$MnO$_{3}$, has been investigated an…
The resistivity, $ρ$ as a function of temperature and ionization energy (doping) and magnetization respectively is derived with further confinements from spin-disorder scattering. The computed $T_{crossover}$ below $T_C$ and carrier density in Ga$_{1-x}$Mn$_x$As system are 8-12 K and 10$^{19}$ cm$^{-3}$, remarkably id…
Abstract. Thermal barrier coating (TBC) systems, needed for higher thrust with increased efficiency in gas turbines, typically consist of an alumina-scale forming metallic bond coat and a ceramic topcoat. The durability and reliability of TBC systems are critically linked to the oxidation behavior of the bond coat. Id…
NH--N hydrogen bonded ferroelectric dabcoHBF4, [C6H13N2]+BF4−, has been studied by dielectric spectroscopy, differential thermal analysis and pyroelectric charge measurement investigations in the low-temperature range between 12 and 300 K, and at elevated hydrostatic pressures up to 1 GPa. The p–T phase diagram has be…
The conformational changes of the photochromic 3-furylfulgide molecule have been studied in relation to its crystal structure. Intense two-photon irradiation of an initial pale yellow single crystal led to a red material that is no longer crystalline but still photochromic. Conversely, starting from a colored single c…
It is shown that the adsorption and morphological properties of layer-by-layer films of poly( o -methoxyaniline) (POMA) alternated with poly(vinyl sulfonic acid) (PVS) are affected dramatically by different treatments of the POMA solutions employed to prepare the films. Whereas the dimension of the globular structures…
The dispersion curves of the surface polaritons of a cylinder which is made of a material with dispersive permittivity and permeability, and which is left-handed over a frequency band, are calculated. It is found that there exist three surface mode bands. With increasing wavevector the three bands converge to three li…
We report a particle-solution spraying process for fabrication of porous electrodes for solid oxide fuel cells (SOFCs). Gd-doped ceria (GDC) particles with composition of Gd 0.1 Ce 0.9 O 2 were suspended in ethanol containing nitrates of Sm, Sr, and Co in a molar ratio of 1:1:2 to form Sm 0.5 Sr 0.5 CoO 3 (SSC) after…
Guest selectivity in complexation of β-chitin with small molecules was studied. Since amines are strong agents for β-chitin complexation, selectivity for various amines was studied first. Of three isomers of phenylenediamine, the para isomer formed a complex, while ortho and meta isomers did not. The selectivity for l…
Propagation of PAMAM (polyamidoamine) dendrons on solid spherical silica gel was achieved by a series of alternate Michael addition and amidation reactions. The reaction kinetics studies were investigated quantitatively. A newly developed method of immobilizing inert 3-(triethoxysilyl) propionitrile (TESPN) on silica…
Abstract The title donor–π–acceptor compounds were prepared by the reaction of acetylenes containing a 1,3-dithiol-2-ylidene unit with tetracyanoethylene (TCNE). They showed amphoteric properties and intramolecular charge-transfer absorptions in the visible region. The molecular and crystal structures were revealed by…
Linear, branched, and arborescent fluoropolymer-Si hybrids were prepared via surface-initiated atom transfer radical polymerization (ATRP) from the 4-vinylbenzyl chloride (VBC) inimer and ClSO(3)H-modified VBC that were immobilized on hydrogen-terminated Si(100), or Si-H, surfaces. The simple approach of UV-induced co…
The pretreatment conditions (temperature, medium) have a strong influence on the N 2 O decomposition activity of Fe−ZSM-5 catalysts (J. Jia et al., J. Catal . 2002, 210, 453). We used X-ray absorption spectroscopy to follow in situ the structural changes of the iron oxide clusters in an Fe−ZSM-5 sample, which was prep…
Polycrystalline europium monoxide (EuO) films doped with and without Gd were prepared using a reactive deposition method in a MBE system. Two different electron doping methods, Gd substitution and oxygen deficiency, enhance the Curie temperature ( T C ) and the temperature dependence of magnetization differently. Gd d…
The visible luminescence of Pr3+ and Tm3+ ions in lead borate glasses has been investigated as a function of activator concentration. The Judd–Ofelt analysis and the Inokuti–Hirayama model for energy transfer between activator ions have been applied for investigations of the radiative and non-radiative relaxation of t…
alpha-Helices are important structural elements in proteins. To provide a scaffold for the facial recognition of peptides, we have explored the interaction of cationic mixed monolayer protected clusters (MMPCs) with a tetra-aspartate peptide in water. In these studies, substantial enhancement of peptide helicity was o…
The activation of Cu + ions for NO binding by the zeolite “ligand” is analyzed. Density functional theory (DFT) calculations show that the interaction of NO with isolated Cu + ions and with Cu + ions in zeolites is of different character. In gas-phase Cu + −NO complexes interactions of the a‘ singly occupied orbital (…
A heparin-conjugated biodegradable polymer (PLA-heparin) by the direct coupling of heparin to polylactide (PLA) was synthesized and characterized. The surface exposed heparin content associated PLA-heparin was measured to be 0.067 microg/cm2. PLA-heparin coated surface has shown higher hydrophilicity rather than contr…
Uniform-sized MnO nanospheres and nanorods were fabricated by the thermal decomposition of Mn−surfactant complexes. The particle sizes of the nanospheres were varied from 5 to 40 nm by changing the surfactant. The shape of the particles could be controlled by varying the experimental conditions. The synthesized MnO na…