Materials Literature
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In the present paper, we report successful synthesis of FeMoO4 hierarchical hollow spheres with 1.0 µm in diameter via a simple, rapid and reliable microwave-assisted solution-phase approach. The phases and morphologies of the products have been characterized by powder X-ray diffraction (XRD), energy dispersive spectr…
Refractories in the Al2O3–SiO2–ZrO2 system are widely used in many applications, for ceramic rollers in particular, and are characterized by high mechanical strength, excellent thermal shock resistance, resistance to corrosion by alkaline compounds and low creep at high temperature. Their performances greatly depend o…
Anionic biosurfactant surfactin-mediated gold nanoparticles were synthesized for the first time in this study. Differing proton concentrations is believed to cause structural changes in the lipopeptide surfactin used to stabilize the gold nanoparticles in aqueous solution, the effects of which on the morphology of the…
Silver(I) oxalate, Ag2(C2O4), reacts with two equivalents of oleylamine (Ag:oleylamine = 1:1 mole/mole) to form an oxalate-bridged silver-oleylamine complex, [(oleylamine)Ag(micro-C2O4)Ag(oleylamine)]. The precursor complex is thermally decomposed at approximately 150 degrees C with CO2 evolution to produce Ag nanopar…
We have studied the role of surface bound anionic species on zinc oxide (ZnO) quantum dots (QDs) for the antibacterial activity against Escherichia coli (E. coli) bacteria. The ZnO QDs with surface adsorbed anionic species of acetate ions and nitrate ions have been synthesized using wet chemical route. X-Ray diffracti…
The purpose of this study is to evaluate the overall toxicity of nasal instilled nanoscale copper particles (23.5 nm) in mice. Pathological examination, target organs identification, and blood biochemical assay of experimental mice were carried out in comparison with micro-sized copper particles (17 microm). However,…
Paenibacillus sp. (formerly Bacillus macerans) strain JJ-1b is able to grow on 4-hydroxybenzoate (4HB) as a sole source of carbon and energy and is known to degrade 4HB via the protocatechuate (PCA) 2,3-cleavage pathway. However, none of the genes involved in this pathway have been identified. In this study, we identi…
When thermal energies are weak, two dimensional lamellar structures confined on a curved substrate display complex patterns arising from the competition between layer bending and compression in the presence of geometric constraints. We present broad design principles to engineer the geometry of the underlying substrat…
Bending modulus of exfoliation-made single-crystalline hexagonal boron nitride nanosheets (BNNSs) with thicknesses of 25-300 nm and sizes of 1.2-3.0 microm were measured using three-point bending tests in an atomic force microscope. BNNSs suspended on an SiO(2) trench were clamped by a metal film via microfabrication…
The photoinduced self-assembly and the formation of the mixed-valence state of tetrathiafulvalene (TTF) in the solid state are reported. The polymer composites containing TTF in poly(vinyl chloride) (PVC) were prepared, and oxidation of TTF by chlorine radical generated by UV irradiation in PVC was investigated. The f…
ZnO nanorods were grown on a variety of substrates such as Si, SiO(2)/Si and sapphire in a large-area pulsed laser deposition chamber designed for sensor device fabrication. Processing conditions were optimized to grow ZnO nanorods with or without seed layers. Au, Cr and BaSrTiO(3) (BST) seed layers were investigated…
We calculate the electric conductance of a graphene nanoribbon (GNR) with and without a point defect. In the case of a zigzag GNR, magnetic moments are formed near the zigzag edges, and the electric current on each edge is spin-polarized. By breaking the symmetry of the magnetic moments with a single defect, such as a…
The near-infrared (NIR) polymethine dye Styryl-13 emitting at approximately 925 nm has recently been suggested as a reference fluorophore for determining the quantum yield (QY) of the NIR photoluminescence of dispersed single-walled carbon nanotubes (SWNTs). Ju et al. reported the QY for SWNTs to be as high as 20% on…
In order to clarify the adsorption mechanism of the O2 molecule on Co–polypyrrole composite metallo-organic catalyst, we have investigated the interaction between the molecule and Co–( n )pyrrole model clusters ( n =4,6) using the density functional theory. The stable adsorption site of the O2 molecule on Co–(4)pyrrol…
The reported anomalously small cell volume and magnetic moment of the layered oxysulfide CeCuOS are apparently the results of copper deficiency arising from exposure to ambient moist air; the stoichiometric compound does exist and is a well-behaved Ce(III) compound.
A Heisenberg model over the square lattice recently introduced by Si and Abrahams to describe local-moment magnetism in the new class of Fe-As high-T(c) superconductors is analyzed in the classical limit and on a small cluster by exact diagonalization. In the case of spin-1 iron atoms, large enough Heisenberg exchange…
A suppression of superconductivity in the late rare-earth $R{\text{FeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ materials is reported. The maximum critical temperature $({T}_{c})$ decreases from 51 K for $R=\text{Tb}$ to 36 K for ${\text{HoFeAsO}}_{0.9}{\text{F}}_{0.1}$, which has been synthesized under 10 GPa pressure.…
This paper presents a synthesis of a novel nanoparticle label with selective biorecognition properties based on a biotinylated silver-dendrimer nanocomposite (AgDNC). Two types of labels, a biotin-AgDNC (bio-AgDNC) and a biotinylated AgDNC with a poly(ethylene)glycol spacer (bio-PEG-AgDNC), were synthesized from a gen…
In the excitation spectra of <TEX>$YNbO_4$</TEX> : <TEX>$Eu^{3+}$</TEX>, the charge transfer (CT) band around 270 nm due to <TEX>$[NbO_4]^{3-}$</TEX><TEX>$-Eu^{3+}$</TEX> interaction and sharp excitation peaks by f-f transition of <TEX>$Eu^{3+}$</TEX> strongly appeared simultaneously. CT band depended on the structura…
We report the doping dependence of the ground state of A-site ordered manganites below and above half doping. Energy and polarization dependence of the orbital reflection, taken by resonant soft-x-ray powder diffraction, at both Mn L(2,3) and O K edges, provides direct evidence for orbital order at Mn(3+) and oxygen s…