Materials Literature
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Macro- and mesoporous hybrid materials have applications in the fields of drug delivery, catalysis, biosensing, and separations. The pore size requirements must be well-understood to maximize the performance (e.g., load capacity and accessibility) of such materials. Hybrid materials were prepared by coating five disti…
The composition and microstructure of five thermoelectric materials, PbTe, SnTe, Pb(0.65)Sn(0.35)Te and NaPb(18-x)Sn(x)BiTe(20) (x = 5, 9), were investigated by advanced transmission electron microcopy. We confirm that the pure PbTe, SnTe, and Pb(0.65)Sn(0.35)Te have a uniform crystalline structure and homogeneous com…
The structure and state of the active component-copper species in zirconia-supported copper catalysts with yttria-stabilized zirconia as a support were investigated. Catalysts with different copper contents (2−10 wt % of Cu) prepared by an impregnation technique were characterized by X-ray diffraction (XRD) analysis,…
We report the observation of a coherent lattice oscillation in a pnictide superconductor. A coherent fully symmetric optical phonon was detected in $\text{Ba}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{As}}_{2}$ ($x=0.06$ and $x=0.08$) using time-resolved pump-probe reflectivity with 40 fs time resolut…
This manuscript investigates the thermal desorption behaviour of MgH(2)/Mg(OH)(2) composites by means of thermal desorption spectroscopy. Besides the H(2)O and H(2) desorption events due to Mg(OH)(2) dehydration and MgH(2) decomposition reactions, respectively, two additional H(2) desorption peaks arise at lower tempe…
New ab initio embedded-cluster calculations devoted to simulating the electronic spectroscopy of Bi(3+) impurities in Y(2)O(3) sesquioxide for substitutions in either S(6) or C(2) cationic sites have been carried out taking special care of the quality of the environment. A considerable quantitative improvement with re…
We report for the first time the conditions under which oriented overgrowth of calcite occurs on muscovite mica. Calcite grows in a (001) orientation parallel to the basal cleavage plane on mica surfaces that have been weathered at ambient humidity (35−40%) for periods of at least 1 h, but no epitaxy is found on fresh…
Many drugs that are currently used for the treatment of cancer have limitations, such as induction of resistance and/or poor biological half-life, which reduce their clinical efficacy. To overcome these limitations several strategies have been explored. Chemical modification by the attachment of lipophilic moieties to…
A layer of randomly packed n-SnO2 nanorods is grown by vapor transport method on the p-SiC(4H) substrate to realize heterojunction light-emitting diodes. Diodelike rectifying current-voltage characteristics, with a turn-on voltage of ∼4.5 V and reverse leakage current density of <0.25 A/m2, are obtained at room…
Trimeric perfluoro-ortho-phenylene mercury(II) cluster is a prototypical example of a macrocyclic multidentate Lewis acid. In this study we report the electronic structure, the calculated absorption and vibrational spectra via all-electron scalar and spin-orbit relativistic DFT calculations for [Hg(o-C6H4)]3 (1), [Hg(…
Polystyrene (S) having short poly(4-hydroxystyrene) (H) on one end (SH, M w = 71.4K, ϕ H = 0.04) and polyisoprene (I) having short poly(2-vinylpyridine) (P) on one end (IP, M w = 57.6K, ϕ P = 0.04) were mixed at various molar ratios, where H and P form a complex by hydrogen bonding interaction. The variation of phase-…
Ferroelectric properties of ${\text{Bi}}_{1\ensuremath{-}x}{\text{Pb}}_{x}{\text{FeO}}_{3}$, through a structural approach, by structural Rietveld refinement and x-ray diffraction versus temperature have been carried out. This study allows us to draw a phase diagram for the system ${\text{Bi}}_{1\ensuremath{-}x}{\text…
The authors describe the preparation and characteristics of flexible indium zinc oxide (IZO)-Ag-IZO multilayer electrodes grown on flexible polyethersulfone (PES) substrates using a roll-to-roll sputtering system for use in flexible organic photovoltaics. By the continuous roll-to-roll sputtering of the bottom IZO, Ag…
Fivefold annealing twin has been observed in nanocrystalline Cu at zero external stress. The microstructure of the multifold twins at various annealing temperatures has been examined by transmission electron microscopic in detail. Contrary to the well known sequential twinning mechanism, coherent twin boundaries forme…
Nature has mastered the art of creating complex structures through self-assembly of simpler building blocks. Adapting such a bottom-up view provides a potential route to the fabrication of novel materials. However, this approach suffers from the lack of a sufficiently detailed understanding of the noncovalent forces t…
Biocompatible and robust gold nanoparticles (AuNPs) were prepared via a simple synthetic strategy employing dextran as a reducing agent and surface coating material. Cross-linking and amination of the surface-coated dextran significantly improved the colloidal stability of AuNPs and rendered the nanoparticles more ame…
In the past, gravimetric corrosion data for fasteners exposed to treated wood has been reported as a percent weight loss. Although percent weight loss is a valid measure of corrosion for comparing identical fasteners, it can distort the corrosion performance of fasteners with different geometries and densities. This r…
The interlayer pi-pi interaction between finite-size models of graphene sheets was investigated by using a density functional theory method, augmented with an empirical R(-6) term for the description of long-range dispersive interaction; these were calibrated by studying the pi-pi interaction between various benzene d…
An energy-dispersive X-ray absorption spectroscopy beamline mainly dedicated to X-ray magnetic circular dichroism (XMCD) and material science under extreme conditions has been implemented in a bending-magnet port at the Brazilian Synchrotron Light Laboratory. Here the beamline technical characteristics are described,…
The coupling of optical Bloch surface waves at the truncated end of one dimensional porous silicon photonic crystals is exploited for fast vapour sensing. Self-standing multilayered membranes bound to transparent substrates were fabricated by electrochemical etching and used in an attenuated total reflection configura…