Materials Literature
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Nuclear resonance vibrational spectroscopy (NRVS) reveals the vibrational dynamics of a Mössbauer probe nucleus. Here, (57)Fe NRVS measurements yield the complete spectrum of Fe vibrations in halide complexes of iron porphyrins. Iron porphine serves as a useful symmetric model for the more complex spectrum of asymmetr…
Precipitates often play key roles in improving the mechanical performance of structural materials. Using first-principles density functional theory method, we have calculated the geometry and energetics of small Xn and XnHe (X = Cu, V, and Ta) clusters in bcc Fe matrix to investigate the effect of He on X precipitatio…
Polymer dispersed liquid crystal (PDLC) films have been prepared by a combination of solvent-induced phase separation and thermal-induced phase separation techniques, for three mesogenic materials: 4-(undecyloxy) benzoic acid (UDBA), 4-(decyloxy) benzoic acid (DBA) and 4-(dodecyloxy) benzoic acid (DDBA) in poly(methyl…
Rates of oxygen-isotope exchange were measured in the tetrasiliconiobate ion [H(2+x)Si(4)Nb(16)O(56)]((14-x)-) to better understand how large oxide ions interact with water. The molecule has 19 nonequivalent oxygen sites and is sufficiently complex to evaluate hypotheses derived from our previous work on smaller clust…
Transparent La2Zr2O7 with cubic pyrochlore structure was first fabricated by reactive spark plasma sintering using commercially available La2O3 and ZrO2 powders. Single phase of pyrochlore La2Zr2O7 was obtained at a sintering temperature of 1673 K and sintering pressure at 100 MPa for 2.7 ks. The La2Zr2O7 sintered bod…
The incommensurately layered cobalt oxide Ca(3)Co(4)O(9) exhibits an unusually high Seebeck coefficient as a polycrystalline bulk material, making it ideally suited for many high temperature thermoelectric applications. In this paper, we investigate properties of Ca(3)Co(4)O(9) thin films grown on cubic perovskite SrT…
The electronic structures and work functions of the single-wall BC3 nanotubes are studied by the first-principle method. In contrast to the armchair nanotubes, the zigzag nanotubes are indirect-band semiconductors. The zigzag nanotubes can be further classified into two types, depending on the wave-vector characterist…
Hopkinson Effect Study in Spinel and Hexagonal Ferrites The magnetic susceptibility shows a Hopkinson peak just below the Curie temperature T C when heating the selected hexagonal and spinel ferrite samples. It is proposed that this peak can be associated with a transition from stable magnetic state to super-paramagne…
Microwave irradiation is a powerful tool in organic synthesis allowing for instance, to reduce reaction times and to obtain the desired products in better yields. Contrary to what is reported in literature, the first Vilsmeier-Haack formylation of Ni(II) and Cu(II) complexes of meso-tetraarylporphyrins by using microw…
Problems associated with current treatment regimens have generated a considerable interest in alternative approaches for the eradication of Helicobacter pylori infections using phytochemical compounds. In an attempt to identify potential sources of such compounds, the antimicrobial activity of five solvent extracts of…
In this article, a precipitation method is investigated to prepare nanoscale zinc oxide (ZnO) as the precursor of silver coated antibacterial nanocomposite. Subsequently, silver loadeded zinc oxide nanocomposites (ZnO/Ag) are prepared by hydrolysis method. The average diameters and morphology of ZnO nanocomposites bef…
This paper presents the case for early commercialization of laser inertial fusion energy (LIFE). Results taken from systems modeling of the US electrical generating enterprise quantify the benefits of fusion energy in terms of carbon emission, nuclear waste and plutonium production avoidance. Sensitivity of benefits-g…
Surface modification of rice husk (RH) with alkali pre-treatment (NaOH solution 5% w/v) was carried out at the initial state to investigate the effect of surface treatment of fibre on the surface interaction between fibre and rubber. Further modification of RH surfaces after alkali treatment was using Liquid Epoxidize…
This paper presents one of the first experimental investigations to analyze the formability of dry woven preform made of flax yarns. A defect analysis at the preform scale, such as wrinkling or buckling is conducted. This work indicates the mechanisms at the origin of these defects. To form complex shapes without gene…
Magnetic nanoparticles (MNPs) have been designed for multifaceted applications such as contrast agents in magnetic resonance imaging (MRI) diagnosis, drug/gene carriers for different kinds of therapeutic agents, tissue repair, hyperthermia, immunoassay, and cell separation/sensing. This review highlights synthesis met…
Chitosan nanofibers were electrospun by using chitosan and triflouroacetic acid (TFA) solution as a solvent. Morphological characteristics of chitosan nanofibers fabricated by the electrospinning technique in different applied voltages (15–25 kV) and tip-to-collector distances (TCD) (5–15 cm) were examined using scann…
Tritium permeation through erbium oxide coatings has been modeled on the basis of experimental results. Permeation models were constructed step-by-step by the introduction of the following predominant parameters: surface coverage, grain size, and energy barrier. The surface-coverage model agreed with the imperfectly c…
A new approach for the synthesis of silver (Ag) nanoparticles and their combination with hydroxyapatite (HAp) to form composites via a sonochemical process has been developed. The Ag particles, obtained using a nitrate precursor, are cubic in structure, spherical in shape, and up to 20 nm in size. The use of precursor…
The successful treatment of brain tumors or metastases in the brain is still hampered by the very efficient blood-brain barrier, which prevents the cerebral accumulation of a pharmacologically sufficient amount of a drug. Beside the possibility of disintegrating the functionality of this effective working barrier, a n…
Carbon nanotubes are molecular structures of graphitic carbons, which are envisioned as hollow cylindrical bars with outstanding properties. They are the most popular ones among the stiffest and strongest fibers, and have remarkable electronic properties and many more unique characteristics. They are widely used in na…