Materials Literature
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The direct synthesis of H2O2 at low temperature (2 degrees C) from H2 and O2 using carbon-supported Au, Pd and Au-Pd catalysts is described and contrasted with data for TiO2, Al2O3 and Fe2O3 as supports. The Au-Pd catalysts all perform significantly better than the pure Pd/TiO2 and Au/ TiO2 materials. The Au Pd/carbon…
Monodisperse ternary ferrite (MFe 2 O 4, M = Co, Ni, Mn, and Fe) nanocrystals have been synthesized through a facile and general route involving thermolysis of an intimately mixed binary metal−oleate complex with similar decomposition temperature of the constituents.
Improved electron transport along a carbon nanotube (CNT) fiber when it is spun from an array of longer nanotubes is reported. The effect of chemical post-treatments is also demonstrated. For example, the covalent bonding of gold nanoparticles to the CNT fibers remarkably improves conductivity (see figure), whereas an…
The B all and N all? Ammonia–borane (AB, H3NBH3) contains 19.6 weight % H, and is one of the materials currently being examined as a possible H2 source for use in fuel cells to power automobiles. Challenges for this technology are noted, and recent advances, especially in the development of both transition-metal and a…
A strong substrate-graphite bond is found in the first all-carbon layer by density functional theory calculations and x-ray diffraction for few graphene layers grown epitaxially on SiC. This first layer is devoid of graphene electronic properties and acts as a buffer layer. The graphene nature of the film is recovered…
A form of optical circuitry is overviewed in which a tapestry of subwavelength nanometer-scale metamaterial structures and nanoparticles may provide a mechanism for tailoring, patterning, and manipulating local optical electric fields and electric displacement vectors in a subwavelength domain, leading to the possibil…
The mechanism that drives a metal-insulator transition in an undoped quasi-one-dimensional Mott insulator is examined in the framework of the Hubbard model with two different hoppings t(perpendicular1) and t(perpendicular2) between nearest-neighbor chains. By applying an N(perpendicular)-chain renormalization group me…
A new occurrence of authigenic albite was found in a Jurassic sedimentary succession of the Glarus Nappe near Walenstadt (eastern Switzerland). The euhedral shape and the chemical purity of these albites are evidence for their authigenic origin. The crystals are irregularly distributed in the sediment, highlighting th…
Self-assembled films from WO 3 and polyallylamine (PAH) were prepared by the Layer-by-Layer (LbL) method. The electroinsertion of lithium ions into these LbL films treated at room temperature and at 150 °C was examined. More specifically, the electrochemical and chromogenic properties were investigated by cyclic volta…
A carbothermal reaction of silica–phenol resin hybrid gels prepared from a two‐step sol–gel process was conducted in atmospheric nitrogen. The gels were first pyrolyzed into homogeneous silica–carbon mixtures during heating and subsequently underwent a carbothermal reaction at higher temperatures. Using a gel‐derived…
2, 6, 12, and 20 electron quantum dots have been studied using coupled cluster at singles and doubles level and extensive multireference coupled cluster (MRCC) method. A Fock-space version of MRCC (FSMRCC) containing single hole-particle excited determinants has been used to calculate low-lying excited states of the a…
We present the analysis of a single exciton eigenstate in a spherical quantum shell and its linear optical absorption by using the parabolic band model and a matrix diagonalization method. The result shows that the confinement effect for an exciton in a spherical quantum shell structure is stronger than that in a sphe…
Parallel nanochains of ZnS and ZnxCd1−xS alloys, and polygonal nanoplates of CdS were prepared at the air/water interface under Langmuir monolayers of 5,10,15,20-tetra-4-oxy(2-stearic acid) phenyl porphyrin (TSPP) at room temperature and characterized by transmission electron microscopy (TEM), high-resolution TEM (HRT…
Abstract A reasonable analytical basis for dispersion‐related descriptions of the temperature dependences of harmonic parts of isochoric heat capacities is given by a three‐oscillator model for phonon density of states (PDOS) spectra of semiconductors with a relatively large degree of phonon dispersion. Within this mo…
The kinetics of refolding of carbonic anhydrase II following transfer from a buffer containing 5 m guanidinium chloride to a buffer containing 0.5 m guanidinium chloride were studied by measuring the time-dependent recovery of enzymatic activity. Experiments were carried out in buffer containing concentrations of two…
Quantum mechanical effects in colloidal particles of semiconductor materials are described (Q-particles). They are observed in the case of extremely small particles (1–10 nm). In these particles the eletronic energy levels experience a transition from semiconductor behavior to molecular behavior. The optical and photo…
Pressure-induced crystallization and phase transformation of amorphous selenium: Raman spectroscopy and x-ray diffraction studies, Yang, Kaifeng, Cui, Qiliang, Hou, Yuanyuan, Liu, Bingbing, Zhou, Qiang, Hu, Jingzhu, Mao, Ho-Kwang, Zou, Guangtian
A new double chained surfactant, 2-octyl-dodecanoyl-6-O-ascorbic acid (8ASC10), with a L-ascorbic acid unit as the polar headgroup was synthesized for the first time. The behavior of the compound in the dry solid state has been characterized through DSC, XRD, and SAXS measurements. The surfactant forms stable viscous…
Abstract Periodic deflections of infrared probe are observed in TlGaSe 2 after lateral excitation with optical pulse. The effect is explained by generation of photoacoustic dilatational wave, which propagates within the crystal. Low pulse fluence (0.01 mJ/cm 2 ) is needed to induce such wave when the layer plane is ex…
We investigated the electronic and optical properties of rock-salt aluminum nitride (AlN) using a first-principles method based on the plane-wave basis set. Analysis of the band structure shows that rock-salt aluminum nitride is a wide gap indirect semiconductor. The band gap is predicted to be 5.82 eV within the scre…