Materials Literature
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Spherical SiO 2 particles have been successfully coated with YVO 4:Eu 3+ phosphor layers through a Pechini sol−gel process. The resulted YVO 4:Eu 3+ @SiO 2 core−shell phosphors were characterized by X-ray diffraction (XRD), Fourier-transform IR spectroscopy, scanning electron microscopy, X-ray photoelectron spectra, t…
We report the fabrication of transparent and flexible transistors where both the bottom gate and the conducting channel are carbon nanotube networks of different densities and Parylene N is the gate insulator. Device mobilities of 1 cm(2) V(-1) s(-1) and on/off ratios of 100 are obtained, with the latter influenced by…
We demonstrate the new features of a polyurethane shape memory polymer: water-driven actuation and recovery in sequence (i.e., programmable). Hydrogen bonding is identified as the reason behind these features. In addition, the absorbed water is quantitatively separated into two parts, namely, the free water and bound…
Longitudinal optical phonons with oxygen character were measured in ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ by inelastic neutron scattering in the (1 0 0) cubic direction and results were compared with shell model predictions. Measurements were performed in several Brillouin zones, which en…
AIMS: To clone and characterize the aspartate-beta-semialdehyde dehydrogenase of Mycobacterium tuberculosis H37Rv. METHODS AND RESULTS: The asd gene of M. tuberculosis H37Rv was cloned in pGEM-T Easy vector, subcloned in expression vector pQE30 having a T5 promoter, and overexpressed in Escherichia coli. The ASD enzym…
Abstract International Standard ISO 19318 specifies the minimum amount of information describing the methods of charge control and charge correction in measurements of core‐level binding energies for insulating specimens by x‐ray photoelectron spectroscopy, which is to be reported with the analytical results. Informat…
AIMS: To develop new measures for controlling both spoilage and pathogenic micro-organisms in unpasteurized apple juice using chitosan. METHODS AND RESULTS: Micro-organisms were isolated and identified from apple juice treated or untreated with chitosan using enrichment, selective media, microscopy, substrate assimila…
Molecular dynamics simulations are carried out to analyze the structure and mechanical behavior of Cu nanowires with lateral dimensions of 1.45–2.89 nm. The calculations simulate the formation of nanowires through a “top-down” fabrication process by “slicing” square columns of atoms from single-crystalline bulk Cu alo…
Abstract This paper presents the development and testing procedures for new packaging systems for papaya fruit. Papaya is a nutritious tropical fruit, consumed both in its fresh form and as a processed product worldwide. Thailand is a major exporter of fresh and processed papayas from Asia. Major quality indices for p…
Abstract The behaviour of the 6% aluminium–magnesium alloy (AM60) surface in zirconium or titanium fluoride aqueous acid solutions was studied. X‐ray photoelectron spectroscopy was used to investigate modifications in the surface chemistry with respect to the composition of the surface treatment solution. The surface…
This Minireview discusses novel insights into the electronic structure of carbon nanotubes obtained using single-molecule fluorescence spectroscopy. Fluorescence spectra from single nanotubes are well described by a single, Lorentzian lineshape. Nanotubes with identical structures fluoresce with different energies due…
BACKGROUND: The hyperthermic effect of magnetic particles was examined in rat prostate cancer in vivo. Magnetic cationic liposomes (MCLs) have a positive surface charge and generate heat in an alternating magnetic field (AMF) due to hysteresis losses. METHODS: Rat prostate cancer cells (PLS 10; androgen independent) w…
A study on the structure and energetics of hydroxyapatite has been carried out using generalized gradient approximation density functional theory. The previously proposed $P{6}_{3}∕m$ and $P{6}_{3}$ hexagonal structural models have been found to be energetically unfavorable as compared with the previously proposed $P{…
An historical review of the development of shielding techniques for indirectly ionizing radiation is presented, along with a summary of techniques at various levels of sophistication for shielding design and analysis.
We have put into evidence the existence of an antiferromagnetic coupling between iron epilayers separated by a ZnSe crystalline semiconductor. The effect has been observed for ZnSe spacers thinner than 4 nm at room-temperature. The coupling constant increases linearly with temperature with a constant slope of ~5.5x 10…
We report a versatile method for executing controllable high-speed rotation of nanowires by AC voltages applied to multiple electrodes. The rotation of the nanowires can be instantly switched on or off with precisely controlled rotation speed (to at least 1800 rpm), definite chirality, and total angle of rotation. We…
The monolayer hydrate (MLH) K03CoO2 x 04H2O was synthesized from K06CoO2 by extracting K+ cations using K2S2O8 as an oxidant and the subsequent intercalation of water between the layers of edge-sharing CoO6 octahedra. A hexagonal structure (space group P63/mmc) with lattice parameters a = 2.8262(1) Angstrom, c = 13.82…
We report first principles analysis of electron-phonon coupling in molecular devices under external bias voltage and during current flow. Our theory and computational framework are based carrying out density functional theory within the Keldysh nonequilibrium Green's function formalism. We analyze which molecular vibr…
Abstract An overview of recent work dealing with luminescence properties in solution of complexes of the lanthanide(3+) ions Nd 3+ , Eu 3+ , Tb 3+ , Er 3+ and Yb 3+ in which an organic chromophore is attached to the metal centre as a sensitizer is given. The various factors that influence the metal‐centred luminescenc…
The Mg-Ni-H switchable mirror system shows a spectacular composition dependence in the hydrogenated state. The optical transmission of a hydrogenated Mg-Ni-H gradient film displays a stripe-like pattern that consists of alternating regions of high and low transmission. This behavior is peculiar as the composite Mg-Ni-…