Materials Literature
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The structural parameters with stability upon Si incorporation and elastic, electronic, thermodynamic and optical properties of Ti3Al1-xSixC2 (0 \leq x \leq 1) are investigated systematically by the plane wave psedudopotential method based on the density functional theory (DFT). The increase of some elastic parameters…
Ceria (CeO2) is a promising catalyst for the reduction of carbon dioxide (CO2) to liquid fuels and commodity chemicals, in part because of its high oxygen storage capacity, yet the fundamentals of CO2 adsorption and initial activation on CeO2 surfaces remain largely unknown. We use density functional theory, corrected…
We investigate the effect of uniaxial stress on InGaAs quantum dots in a charge tunable device. Using Coulomb blockade and photoluminescence, we observe that significant tuning of single particle energies (~ -0.5 meV/MPa) leads to variable tuning of exciton energies (+18 to -0.9 micro-eV/MPa) under tensile stress. Mod…
The short-term toxicity of citrate-stabilized silver nanoparticles (AgNPs) and ionic silver Ag(I) to the ichthyotoxic marine raphidophyte Chattonella marina has been examined using the fluorometric indicator alamarBlue. Aggregation and dissolution of AgNPs occurred after addition to GSe medium while uptake of dissolve…
Ligand exchange reactions are widely used for imparting new functionality on or integrating nanoparticles into devices. Thiolate-for-thiolate ligand exchange in monolayer protected gold nanoclusters has been used for over a decade; however, a firm structural basis of this reaction has been lacking. Herein, we present…
We demonstrate that ZnO/metal junctions, produced by a commonly used electrochemical oxidation procedure, are prone to lateral (two-dimensional) heterogeneities. These heterogeneities are not apparent in bulk structural measurements (such as X-ray diffraction data), but are evident in the electrodeposit's electrical (…
Department of Chemistry, Chonbuk National University, Jeonju 561-756, KoreaReceived March 20, 2012, Accepted March 27, 2012Key Words : 1,4-Bis(dimethyl-3-pyridylsilyl)benzene, Bistable molecule, Cyclodimer, 3,5-Di- tert-butyl-1,2-benzoquinone, Intramolecular electron transferMetal complexes containing 1,2-semiquinonat…
New series of iron, ruthenium, and osmium octabutoxynaphthalocyanines were synthesized by inserting corresponding metals into the metal-free octabutoxynaphthalocyanine. Although preparation of axial ligand-free iron octabutoxynaphthalocyanines was reported before, we could not reproduce the synthesis by following the…
We investigate the possibility of using light scattering data in the single-phase regions of a ternary liquid mixture phase diagram to infer ternary mixture coexistence curves, and to infer tie lines joining the compositions of isotropic liquid phases in thermodynamic equilibrium. Previous analyses of a nonlinear ligh…
(≥ 99.0%), n-octane (≥ 99.0%). These solvents were purchased from Sigma-Aldrich and used without further purification. The surface of the graphite target was polished with 1200grade emery paper prior to laser irradiation using a Qswitched Nd:YAG laser (Continuum, Surelite I, λ = 1064 nm, pulse duration 5 ns) operated…
Abstract High quality single crystal diamond is widely used for generating highly polarized high energy photon beams in the photonuclear physics study. The quality of the diamond crystal has a vital effect on the polarization of the photon beam which should be as high as possible as required by the experiments at Jeff…
A 3 μs long molecular dynamics simulation of the TIP4P-Ew water model is presented to investigate the relaxation properties of an atomistic model in the supercooled region below the temperature of homogeneous nucleation. This is an effort towards a better understanding of the equilibrium properties of the liquid phase…
The lattice deformation of a -ZnO films on r -plane Al 2 O 3 substrates, grown by plasma-assisted molecular-beam epitaxy (PAMBE), is strongly dependent on growth temperature: i) the unit cell volume is smaller than that of a reference ZnO bulk and it increases with the increase in growth temperature; ii) a -plane latt…
Superparamagnetic polyaniline/bismuth ferrite (PANI/BFO) nanocomposite powder is synthesized through an in situ sol–gel polymerization method and it is embedded in non-magnetic poly(vinyl alcohol) (PVA) matrix to fabricate high performance flexible films. The interaction between PANI/BFO filler and PVA matrix and henc…
Mixing Cu(II)Cl 2 with free base tetraphenylporphyrin (( H 2 (TPP)) in dry deaerated 1,2-dichloroethane surprisingly yields a mixture of Cu(II) (TPP) and Cu(III) (TPP). The later is long-lived in the absence of water and slowly decomposes within days to yield Cu(II) (TPP). Furthermore, in the presence of air, a slight…
Abstract Mesoporous alumina has many environmental applications as catalysts support and adsorption or separation material. We studied the synthesis conditions for the mesoporous alumina formation from aluminum isopropoxide in the presence of anionic (lauric and stearic acid), cationic (cetyltrimethylammonium bromide,…
Manganese oxide (MnO 2 ) has been successfully deposited on the surface of porous carbon spheres (CS) by in-situ co-precipitation. The electrochemical capacitive behaviors of the resulting ternary composites (MnO 2 /CS) as active electrode materials have been investigated in 0.1 M Na 2 SO 4 by different electrochemica…
Abstract The monomer 2‐methyl‐3‐oxo‐5‐phenyl‐4‐pentenonitrile (MOP) was prepared by reaction of ethyl cinnamate and propionitrile in alkaline mixture. This monomer exhibits three possible tautomeric forms. The tautomeric equilibria of MOP and its copolymers with styrene in different solvents were analyzed by 1 H NMR s…
Abstract A novel degradable flexible polyurethane (PU) foam was prepared by varying the ratio of poly(propylene oxide) (PPO) and triarm poly(propylene oxide)‐ block ‐polylactide copolymer (PPO‐ b ‐PLA), and was compared with conventional PU foams based on toluene diisocyanate (TDI) and PPO. Fourier transform infrared…
Abstract In order to design soft coatings, surface tethering of vesicular structures self‐assembled from oligonucleotide‐polymer hybrids is achieved through hybridization. Watson‐Crick base‐pairing occurs between the nucleotide sequences involved in the self‐assembly and their surface‐tethered complementary sequences.…