Materials Literature
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FeAs- single layer is tested as a simple model for LaFeAsO and BaFe2As2 based on first-principles calculations using generalized gradient approximation (GGA) and GGA+U. The calculated single- layer geometric and electronic structures are inconsistent with that of bulk materials. The bulk collinear antiferromagnetic gr…
Since nearly 4 decades, various theoretical behaviours have been found for the thermopower in the variable range hopping regime. In 1969, Cutler and Mott have predicted a linear variation with temperature T of the thermopower: S = const.T. In the seventies, it has beenfound by Zvyagin, Overhof and Mott that S = const.…
We report on the influence of stray fields for both low and high magnetic fields applied parallel to trilayers consisting of a low-T Nb interlayer and two outer Ni Fe layers having in-plane anisotropy. At low magnetic fields these trilayers exhibit a pronounced magnetoresistance effect. Its dynamic transport behavior…
The structure, thermodynamic and kinetic stability, and activity of cytochrome c (cyt c) on silica nanoparticles (SNPs) of different sizes have been studied. Adsorption of cyt c onto larger SNPs results in both greater disruption of the cyt c global structure and more significant changes of the local heme microenviron…
Abstract Sulfur doping of single‐walled carbon nanotubes and graphene is possible from a thermodynamic standpoint, according to DFT calculations. In the case of graphene, the doped sheet can be a small‐band‐gap semiconductor, as revealed by a plot of the band structure (see picture), or it can have better metallic pro…
Ionic liquids allow millimeter-long single-walled carbon nanotubes to associate tightly, forming a free-standing sheet with superb mechanical and electrical properties. An actuator strip, fabricated by sandwiching an ionic-liquid-gel electrolyte layer with the nanotubes sheets obtained exhibits a large deformation in…
Polyester synthesis by lipase catalyst involves two major polymerization modes: i) ring-opening polymerization of lactones, and, ii) polycondensation. Ring-opening polymerization includes the finding of lipase catalyst; scope of reactions; polymerization mechanism; ring-opening polymerization reactivity of lactones; e…
Chitin, chitosan, and their derivatives have been identified as versatile biopolymers for a broad range of agriculture and food applications. Up to now, several methods have been developed to determine degree of N-acetylation, DA, for chitin and chitosan. In this article, an effort has been made to review the availabl…
Highly efficient green-light-emitting diodes (LEDs) based on [email protected] quantum dots (QDs) with a chemical-composition gradient are demonstrated. Through the moderate control of QD coverage in multilayered devices, excellent device performance has been achieved. The color-saturated green-light emission (see fig…
Nanosilver is increasingly used in the food industry and biomedical applications. A lot of studies have been done to investigate the potential toxicity of nanosilver. But information on whether or how nanosilver particles bring changes in genetic materials remains scant. In this study, the replication fidelity of the…
We report the properties of a field effect transistor (FET) and a gas sensor based on CuO nanowires. CuO nanowire FETs exhibit p-type behavior. Large-scale p-type CuO nanowire thin-film transistors (10(4) devices in a 25 mm(2) area) are fabricated and we effectively demonstrate their enhanced performance. Furthermore,…
A n-type and redox-active radical polymer bearing galvinoxyl radicals, poly(galvinoxylstyrene), is utilized as an anode-active material, which enabled, for the first time, the fabrication of a totally organic polymer- based rechargeable battery in conjunction with p-type redox-active radical polymer. This battery was…
We use bulk magnetic susceptibility, electronic specific heat, and neutron scattering to study structural and magnetic phase transitions in ${\text{Fe}}_{1+y}{\text{Se}}_{x}{\text{Te}}_{1\ensuremath{-}x}$. ${\text{Fe}}_{1.068}\text{Te}$ exhibits a first-order phase transition near 67 K with a tetragonal-to-monoclinic…
Optical properties of GaInP/GaAs:Er,O/GaInP double heterostructure (DH) laser diodes (LDs) grown by organometallic vapor phase epitaxy (OMVPE) were investigated. The Er-doped LDs showed laser emission of the GaAs band-edge. The threshold current density ( J th ) was 3.6 kA/cm 2 on the n -type GaAs substrates and 15.8…
An FT-IR spectrum of trimethylphenyl ammonium chloride (TMPAC) has been recorded in the region 4000 - 400 cm −1 . The optimized geometry and vibrational spectrum TMPAC in the ground state have been calculated by using ab initio Hartree-Fock (HF) calculations and the density functional method B3LYP with the 6-31G (d) b…
The inhibition behavior of metol (N-methyl-p-aminophenol sulphate) on mild steel in HCl and H2SO4 containing different concentration of metol at room temperature was investigated by chemical and electrochemical method. It has been observed that corrosion rate decreases and inhibition efficiencies and surface coverage…
Composites, based on natural rubber (NR), acrylonitrile butadiene rubber (NBR) and carbon black in different ratios, with three vulcanizing systems were prepared. Three types of carbon black viz. semi-reinforcing furnace (SRF), high abrasion furnace (HAF) and intermediate super abrasion furnace (ISAF) were used for re…
Barium carbonate (BaCO 3 ) with multiple morphologies were synthesized using BaCl 2 and Na 2 CO 3 in the presence of a copolymer of poly(styrene) (PS) and poly(acrylic acid) (PAA), an amphiphilic copolymer, by a simple solvent reaction route. X-ray powder diffraction and field emission scanning electron microscopy wer…
Specific heat of carbon nanotube (CNT) is affected by its diameter. Increasing of the CNTs diameter increases its specific heat. This phenomenon is due to transversal acoustic phonon modes. The contribution to specific heat from TA modes varies linearly with temperature and becomes saturated after specific temperature…
This paper continues the series of papers devoted to the description of the resolution function of neutron powder diffractometers with focusing monochromators, where a mathematically correct approach for taking into account spatial effects has been developed. The manifestation of such effects is clearly demonstrated f…