Materials Literature
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Abstract Ion beam irradiation has been widely used to modify the structure and properties of membrane surface layers. In this study, the gas permeability and selectivity of an asymmetric polyimide membrane modified by He ion irradiation were investigated using a high vacuum apparatus equipped with a Baratron absolute…
Although a case has been made that single-wavelength anomalous dispersion (SAD) is the optimal strategy for data collection in the presence of radiation damage, two-wavelength MAD experiments at the inflection and a high-energy remote point of the absorption edge have been shown to be a potentially successful alternat…
En el presente estudio se implementó la técnica de colonización en sustratos artificiales durante un periodo de siete meses (noviembre de 2004 a mayo de 2005). En el sector de mayor urbanización del humedal, los grupos de microalgas de mayor representatividad fueron las euglenófitas ycianófitas, con un promedio de abu…
10.1088/0953-8984/19/2/026215
The atomic and electronic structure of the boundary in diamond has been examined using the density-functional theory with the plane-wave pseudopotential method. Boundary states lower than the bulk conduction-band minimum have been observed in the reconstructed structure without rigid-body translation (RBT), consistent…
Functionally graded materials (FGM) are material candidates for niche Army applications such as armor. Development of an FGM with a tailored ceramic-to-metal through-thickness gradient is one approach where an improved mass and space armor material for ballistic protection can conceivably be provided. This work invest…
Textured Sr 0.63 Ba 0.37 Nb 2 O 6 ferroelectric ceramics, with relaxor characteristics, were fabricated by the hot forging process. The analysis of the complex dielectric constant as a function of the temperature revealed the presence of three dielectric anomaly regions. In addition, the relaxor behaviour of this cera…
We present the electron field-emission (FE) characteristics of conical boron nitride nanorods grown on a (1 0 0) n-type silicon substrate. The emission current can be up to ∼60 µA at an applied voltage of ∼3 kV. Two distinct slopes are evident in the Fowler–Nordheim (FN) plot. The FE characteristics can be explained u…
This contribution describes the synthesis of a novel pyrazole-pyrrole building block and its use in the formation of a non-aromatic, Schiff base-type macrocycle incorporating a chromophore and H-bonding donor and acceptor functionalities inside and outside of the macrocycle, which makes it predestined for molecular re…
The charge transport properties of the low-dimensional thermoelectric materials K2Bi8−xSbxSe13 (0<x⩽8) were studied as a function of temperature and composition. The Seebeck coefficient shows an evolution from n- to p-type character with increasing incorporation of Sb, and at the same time the temperature depen…
La-substituted Bi 1− x La x FeO 3 films have been prepared on LaNiO 3 /SiO 2 /Si(1 1 1) substrates by the sol–gel process. The films with x = 0.00–0.20 were prepared at an annealing temperature of 600 °C. X-ray diffraction patterns indicate that all films adopt R3m structure and different orientation with the increase…
Polycrystalline $\mathrm{Ba}\mathrm{Co}{\mathrm{O}}_{3}$ was synthesized by a citrate technique using thermal treatments at high oxygen pressure. Magnetic susceptibility measurements were carried out at very low ac and dc fields on the compound. The magnetic properties of the material between 14 and $30\phantom{\rule{…
We have investigated the defect structure in pure Co-doped and (Co, Nb)-doped TiO2 (anatase) thin films grown by pulsed laser deposition on (001) single crystal LaAlO3. Although both films exhibit room temperature ferromagnetism, dilute Nb doping significantly improves the conductivity and microstructure of the TiO2 (…
A screen-printed carbon nanotube (CNT) paste for applications to field emission emitters was treated with He, He∕Ar, and He∕N2 atmospheric pressure plasmas. The effect of the different plasma treatments on the field emission characteristics of the screen-printed CNTs was investigated. The atmospheric pressure plasma a…
The ionic liquid crystal [C12-mim]Cl has been doped with 5 mol% europium nitrate and the photophysical properties of both the ionic liquid and the trivalent europium ion have been monitored with respect to temperature in the range of −48 to +120 °C. The relative transition probabilities to the various ligand-field sub…
We report the combined measurements of the dc susceptibility ${\ensuremath{\chi}}_{0}$, the ac susceptibility ${\ensuremath{\chi}}^{\ensuremath{'}}$, and the NMR relaxation rate ${T}_{1}^{\ensuremath{-}1}$ for the molecular-based heterometallic single-chain magnet ${[\mathrm{Mn}(\text{saltmen})]}_{2}[\mathrm{Ni}{(\mat…
Density functional theory (DFT) at the hybrid B3LYP level has been applied to Ge(12)(z) bare germanium clusters (z = -6, -4, -2, 0, +2, +4, +6) starting from 11 initial configurations. The Wade-Mingos rules are seen to have limited value in rationalizing the results since they frequently require vertex degrees higher…
Diffraction gratings and reactive ion etching textures have been proposed as a way to enhance the optical performance of solar cells. Extensive calculations have been carried out to investigate the influence of depth-to-period ratio of triangular and rectangular gratings on front reflectance. Losses are quantified by…
OBJECTIVES: Autologous vein grafts are still widely used, but their long-term patency is suboptimal. The objective of the current study was to determine whether wrapping a vein graft in gelatin hydrogel sheet incorporating basic fibroblast growth factor improves their mechanical and physiological properties. METHODS A…
p‐Xylylene diazide (XDA) and dipropargyl ether of bisphenol A (DPEBPA) were synthesized and then a novel polytriazole, poly(4,4′‐(propane‐2,2‐diyl) diphenyl‐oxy‐methylene‐1,5 (and 1,4)‐(1,2,3‐triazole)‐p‐xylene), was prepared from XDA and DPEBPA by 1,3‐dipolar cycloaddition polymerization and characterized by FTIR, 1H…