Materials Literature
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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…
High pressure Raman spectra and in situ electrical conductivity measurement of scheelite-structure PbMoO 4 have been conducted using a diamond anvil cell (DAC). The Raman spectra of powdered PbMoO 4 were determined up to 26.5 GPa under nonhydrostatic conditions. The results indicate that PbMoO 4 undergoes a transition…
A room-temperature magnet of V[MeTCEC]2·0.6(CH2Cl2) composition (MeTCEC = methyl tricyanoethylenecarboxylate) is formed by the reaction of MeTCEC and V(CO)6 (see figure). Analysis of the magnetization indicates a less disordered structure of V[MeTCEC]2·0.6(CH2Cl2) with respect to similarly synthesized V[TCNE]x·0.34(CH…
The structural modifications of SnO within the tetragonal phase (α-SnO) and the orthorhombic phase (y-SnO) with pressure were extensively studied by using the first-principles pseudopotential plane-wave method within the generalized gradient approximation. A structural phase transition from α-SnO to γ-SnO is predicted…
Abstract The structures and the electronic states in electrodeposited semiconductor Cu–O thin films have been investigated for each annealing temperature ( T A ) by X‐ray diffraction (XD) and X‐ray absorption spectroscopy (XAS) near the Cu K edge using synchrotron radiation. The thin films prepared as grown and anneal…
The electronic band structure, transport properties, and lattice dynamics in AuX2 (X = Al, Ga and In) under high pressure have been extensively studied with full potential linearized augmented plane wave and pseudopotential plane wave methods. The theoretical results for the electronic band structure and Fermi surface…
A new copper complex (2) has exhibited highly efficient catalytic activity of luminol chemiluminescence in water in the presence of ascorbic acid and dissolved O2 under conditions that conventional catalysts such as Cu(OAc)2, hemin or cyclen-Cu(II) did not show significant activity.
Abstract Various micronized polytetrafluoroethylene (PTFE) powders were compounded with silicone rubber (MQ) and mechanical properties of the MQ/PTFE composites were evaluated. The fracture surface morphologies of prepared composites were also investigated using scanning electron microscopy (SEM). At a level of only 5…