Materials Literature
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Using a novel approach to calculate optical properties of strongly correlated systems, we address the old question of the physical origin of the alpha to gamma transition in Ce. We find that the Kondo collapse model describes the optical data better than the Mott transition picture. Our results compare well with exist…
Extensive electronic structure calculations are performed to obtain the stable geometries of metals like Al, Ga and In on the Si(001) surface at 0.5 ML and 1 ML coverages. Our results coupled with previous theoretical findings explain the recent experimental data in a comprehensive fashion. At low coverages, as shown…
We report a uniaxial pressure-dependence of magnetism in layered perovskite strontium ruthenate Sr3Ru2O7. By applying a relatively small uniaxial pressure, greater than 0.1 GPa normal to the RuO2 layer, ferromagnetic ordering manifests below 80 K from the enhanced-paramagnet. Magnetization at 1 kOe and 2 K becomes 100…
The volume of tantalum versus pressure has been accurately measured up to 101 GPa by single-crystal x-ray diffraction, with helium as pressure transmitting medium. Slight deviation from previous static determinations is observed. Discrepancy with reduced shock-wave and ultrasonic data supports recent doubts about the…
Using effective-field theory with correlations, we investigate the effects of interfacial pseudo-spin coupling fluctuations on the susceptibility and polarization of ferroelectric superlattices within the framework of transverse Ising model. It is found that the interfacial coupling fluctuations increase the susceptib…
Abstract The aim of this work was to study the variations in the oxygen diffusion, solubility, and permeability coefficients of polylactide (PLA) films at different temperatures (5, 23, and 40°C) and water activities (0–0.9). The results were compared with the oxygen diffusion, solubility, and permeability coefficient…
Carbon nanotubes are being contemplated as reinforcements for the next generation of composite materials. Stress and strain measures at an atomic scale are required to study the effect of inhomogeneities in nanotube based structures. In this work, we have adapted three different stress measures at atomic scales and in…
A comparison of the stability and catalytic activity of PAMAM−OH generation 4 dendrimer−Pd nanoparticles (1.3 ± 0.1 nm) with the previously studied PVP−Pd nanoparticles (2.1 ± 0.1 nm) in the Suzuki coupling reaction between phenylboronic acid and iodobenzene is conducted. After the first cycle, the average size of the…
Completing RGB color space: The electrochemical and optical properties of the first electrochemically prepared conducting polymer that is green in its neutral form are reported. The extreme stability of this polymer after 10 000 double potential steps makes it the best and only candidate for providing the missing thir…
We present classical molecular dynamics simulations demonstrating that single-wall carbon nanotube (SWNT) bundles collapse under hydrostatic pressure. The collapse pressures obtained as a function of nanotube diameter are in excellent quantitative agreement with new data presented here for small diameter (d approximat…
The wetting of porous templates with polymer melts and solutions or polymer-containing mixtures is a simple and versatile method for the preparation of tubular structures with diameters ranging from a few tens of nanometers to micrometers. The tube walls can be made of a multitude of materials, some of which have thus…
Tip-enhanced Raman spectroscopy (TERS) is based on the optical excitation of localized surface plasmons in the tip-substrate cavity, which provides a large but local field enhancement near the tip apex. We report on TERS with smooth single crystalline surfaces as substrates. The adsorbates were CN- ions at Au(111) and…
Hexagonal sodium yttrium fluoride, NaYF 4, is the most efficient host material to date for green (Yb 3+ /Er 3+ doped) and blue (Yb 3+ /Tm 3+ doped) upconversion (UC) phosphors, i.e., phosphors which emit visible light upon infrared (IR) excitation. The structure of the hexagonal phase gives rise to controversy about t…
Abstract The synthesis and crystal structure of Li 3 AlB 2 O 6 with different cell parameters are reported and these cells are transformed each other from the confirmation of crystallographic structural analyses. The absorption spectrum, luminescence and lifetimes of the Li 3 AlB 2 O 6 and LiSrBO 3 solid compounds are…
A review discusses the roles of novel alkoxy titanates and zirconates as additives for polymers. As coupling agents, they chemically bond inorganic as well as organic fillers and polymers via proton coordination without the need of water of condensation as for alkoxysilanes. Thermally stable alkoxy titanates and zirco…
Kinetics of the processes of low density polyethylene (PE-LD) crosslinking in the presence of three commercial organic peroxides: dicumyl (Di-Cup R), t-butylcumyl (Interox BCUP) or 2,5-dimethyl-2,5-di-(t-butylperoxy)-hexyne (Interox DYBP) ones were compared using rheometric method. Ranges of the peroxides themselves d…
Metal hypophosphites are widely used in various fields. However, their structures have not been adequately studied. The synthesis conditions (the temperature and precursors) were found and crystals of anhydrous Li, K, Rb, Cs, and NH 4 hypophosphites were grown. The structures of these compounds were established by X-r…
Abstract Crystallization of binary blends of semi-crystalline polyolefins (i-polypropylene and HD-polyethylenes) and amorphous cycloolefin copolymers (COC) was followed by Differential Scanning Calorimetry (DSC). Blend morphologies were investigated by Scanning Electronic Microscopy (SEM). The thermal behavior and mor…
Abstract Thin films (50–1200 nm) of YFeO3 were deposited on fused silica substrates by spray-pyrolysis using ethylene glycol solution of Y-Fe(III) citric complexes. The films were post deposition annealed at 750°C in static air for 2 h. Films obtained in this way were afterwards irradiated by a burst mode operated Nd-…
The effect of SBS and nano-CaCO3 on the mechanical properties of PS blends was studied, and their morphologies were characterised by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The Izod impact strengths of notched samples of PS/SBS/CaCO3 blends with nanometre particles of nano-CaCO3…