Materials Literature
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Oxygen permeabilities of nanocomposite films consisting of poly(methyl methacrylate) (PMMA) and different amounts of spherical zinc oxide (ZnO) nanoparticles were determined to investigate the barrier effect of this material with respect to particle content. A method was applied which is based on quenching of an excit…
Abstract Two new thiostannates, (DBNH) 2 Sn 3 S 6 ( 1 ) and (DBNH) 2 Cu 6 Sn 2 S 8 ( 2 ), were synthesized under solvothermal conditions using Cu, Sn, S and DBN (DBN = 1,5‐diazabicyclo[4.3.0]non‐7‐ene). Compound 1 is a rare example of a mixed‐valent thiostannate. The Sn II center exists in the rare trigonal pyramidal…
Crystal structures have been determined for six dipolar polyene chromophores with metallocenyl - ferrocenyl (Fc), octamethylferrocenyl (Fc″), or ruthenocenyl (Rc) - donors and strong heterocyclic acceptors based on 1,3-diethyl-2-thiobarbituric acid or 3-dicyanomethylidene-2,3-dihydrobenzothiophene-1,1-dioxide. In each…
Zn 1− x Co x O nanocrystals were produced by forced hydrolysis in diethyleneglycol. The as-produced crystals are paramagnetic. However, heating at 400 °C under a nitrogen atmosphere for 1 h induces ferromagnetism at room temperature, characterized by coercive field (0.38 kOe) and magnetization at 10 kOe (0.10 μ B /Co)…
We have investigated the effect of excimer laser annealing on the chemical bonding, electrical, and optical properties of ZnO nanowires. We demonstrate that after laser annealing on the ZnO nanowire field effect transistors, the on-current increases and the threshold voltage shifts in the negative gate bias direction.…
The magnetocaloric effect (MCE) of the amorphous Fe–Zr–B–M (M=Mn, Cr, and Co) ribbons has been investigated. The MCEs of the Fe90−xZr10Bx (x=5, 10, 15, and 20) ribbons are enhanced with small amounts of boron addition. Furthermore, the Curie temperature of the specimens can be decreased to be about room temperature wi…
Thin films of epitaxial LaCoO3 were synthesized on SrTiO3 and (La,Sr)(Al,Ta)O3 substrates, varying the oxygen background pressure in order to evaluate the impact of epitaxial growth as well as oxygen vacancies on the long range magnetic order. The epitaxial constraints from the substrate impose a tetragonal distortion…
Abstract The multiwalled carbon nanotubes/polypropylene nanocomposites (PP/CNTs) were prepared by melt mixing using maleic anhydride grafted polypropylene ( m PP) as the compatibilizer. The effect of m PP on dispersion of CNTs was then studied using the tool of rheology, aiming at relating the viscoelastic behaviors t…
We report on our studies of interacting electrons in bilayer graphene in a magnetic field. We demonstrate that the long-range Coulomb interactions between electrons in this material are highly important and account for the band asymmetry in recent optical magneto-absorption experiments [E. A. Henriksen, Phys. Rev. Let…
In this paper, we report a two-step aqueous synthesis of highly luminescent CdTe/CdSe core/shell quantum dots (QDs) via a simple method. The emission range of the CdTe/CdSe QDs can be tuned from 510 to 640 nm by controlling the thickness of the CdSe shell. Accordingly, the photoluminescence quantum yield (PL QY) of Cd…
Nickel nanoparticles have been synthesized by a simple wet chemical reduction technique in the presence of a surfactant sodium dodecyl sulfate (SDS) and a capping agent oleic acid. Varying the concentration of the surfactant and the capping agent has been found to critically govern the nature of the nanoparticles prep…
A novel self-cleaning glass was successfully achieved by coating macroscopical SiC nanowires (SiCNWs) in tetraethyl orthosilicate (TEOS) solution. The water contact angle (CA) was high, up to approximately 160 degrees, and the sliding angle was low, down to approximately 5 degrees, when SiCNWs were coated through 10 c…
Highly porous, emulsion-templated polymers, polyHIPE, that are synthesized within high internal phase emulsions (HIPE) combine a fully interconnected open-pore structure with mechanical integrity and the ability to absorb relatively large amounts of liquid through capillary action. Biodegradable polyHIPE would be of i…
We study the glass transition (GT) in a model system that exhibits the presence of more than one liquid or glassy state ("polyamorphism") using molecular dynamics simulations. We study the Jagla model [E. A. Jagla, J. Chem. Phys. 111, 8980 (1999)], a two-scale spherically symmetric ramp potential with both attractive…
Cation exchange is shown to be a simple and efficient method to prepare nanostructured Ag(2)Se gels and aerogels from CdSe gel precursors. Treatment of CdSe wet gels with AgNO(3) yields, for the first time, Ag(2)Se gels, and these are transformed to high surface area, nanostructured aerogels by supercritical fluid dry…
The nature and role of different Au species on a Au/SiO 2 catalyst in room temperature (rt) CO oxidation have been studied by operando diffuse reflectance infrared spectroscopy (DRIFT) coupled with quadruple mass spectrometry (QMS). It has shown that different pretreatments (oxidative and reductive) of Au/SiO 2 have a…
Density-functional theory (DFT) calculations have been performed to study the atomic scale energies, structures, and formation mechanisms of dissolved Y, Ti, and O solutes and small Y-Ti-O nanoclusters (NCs) in a bcc Fe lattice. Key results include the following observations. The Y and O are dissolved during mechanica…
Encapsulation by synthetic hosts can transform the spin states of square planar Ni(II)(acen) and Co(II)(tap) complexes. Upon encapsulation, the red Ni(II) diamagnetic state was converted into a green paramagnetic state, whereas the Co(II) low spin (S = 1/2) state was changed into a coupled (S = 1/2 and S = 3/2) state.…
We study the influence of pentagons and heptagons, dislocations, and other topological defects breaking the sublattice symmetry on the magnetic properties of a graphene lattice. It is known that vacancies and other defects involving uncoordinated atoms induce localized magnetic moments in the lattice. Within the Hubba…
Ink-jet printable thin-film transistors (TFTs) on flexible plastic substrates are an important focus of research because present silicon-based electronics cannot realize such devices. In the present study, we fabricated single-walled carbon nanotube (SWCNT) TFTs on plastic substrates using the ink-jet printing method,…