Materials Literature
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Glasses of the x Cr 2 O 3 ·(100-x)[70 TeO 2 ·25 B 2 O 3 ·5 PbO ] system, with 0≤x≤20 mol %, were prepared and investigated by infrared and Raman spectroscopies in attempt to determine the local structure of glasses. The results shown that BO 3 and BO 4 are the main structural units of the glass system and the chromium…
The motion of membrane-bound objects is important in many aspects of biology and surface chemistry. Here we derive some general relations for objects moving in a surface film overlying a fluid of depth H . A solution to the problem of the drag can be obtained from a two-dimensional system of integral equations. Here w…
A new series of smectic C* (SmC*) mesogens containing a chiral (R)-2-octyloxy side chain and either a fluorenone (2a-e) or chiral fluorenol (3a-e) core were synthesized using a combined directed ortho metalation-directed remote metalation strategy. The SmC phase formed by the fluorenol mesogens is more stable and has…
ADVERTISEMENT RETURN TO ISSUEPREVNoteMicrowave-Assisted Preparation of Hierarchical Mesoporous−Macroporous Boehmite AlOOH and γ-Al2O3Tie-Zhen Ren, Zhong-Yong Yuan, and Bao-Lian SuView Author Information Laboratory of Inorganic Materials Chemistry, The University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Bel…
The translational velocities of two spherical gas bubbles oscillating in water, which is irradiated by a high-intensity acoustic wave field, are calculated. The two bubbles are assumed to be located far enough apart so that shape oscillations can be neglected. Viscous effects are included owing to the small size of th…
Carbon nanotubes have been featured prominently in the nanotechnology research for some time, yet robust strategies for noncovalent chemical modification of the nanotube surface are still missing. Such strategies are essential for the creation of functional device architectures. Here, we present a new general procedur…
New opportunities, provided by the 2,2'-[1,1'-binaphthyl-2,2'-diylbis(nitrylomethilidyne)]diphenol (SB(OH)2)/Al(OiPr)3/racemic lactide (rac-LA) polymerization system, employing a combination of stereoelection with (S) and (R) ligand-exchange mechanism at Al-alkoxide active centers were explored. The stereoelectivity w…
Dextran is soluble in both water and organic solvents, so it could be a versatile biomacromolecule for preparing nanofibrous electrospun membranes by blending with either water-soluble bioactive agents or hydrophobic biodegradable polymers for biomedical applications. We have formulated electrospun dextran membranes,…
Fluorescence quenching in solutions of a pendant-functionalized conjugated polymer chemosensor ( ttp-PPETE ) has been evaluated in the presence of a variety of transition metal cations, including Ni 2+, Co 2+, Cu 2+, Fe 2+, and Cr 6+ . Photophysical analysis of the emission quenching revealed a static quenching mechan…
Gamma-Al2O3, ZrO2, and TiO2 gold supported model catalysts have been synthesized by laser vaporization. Structural characterization using Transmission Electron Microscopy and X-ray Photoelectron Spectroscopy experiments have shown that the gold clusters deposited on the different supports have similar distribution of…
In this study, design and fabrication of bi-focal diffraction optical elements (DOEs) with sub-micrometer and eight-level structure are presented. The principle of phase iteration algorithm was applied to design the bi-focal DOEs. To reduce the production costs, a complete LIGA process was successfully demonstrated to…
A method to approximate ab initio shielding constants is presented, in which the ab initio density matrix is replaced in the gauge invariant atomic orbital formalism with the density matrix resulting from an effective fragment potential calculation. The resulting first-order density matrix is then iterated to self-con…
We analyze the infrared and Raman spectra (both experimentally and with the aid of quantum chemical calculations) of a series of polyenals which provide us with the fortunate case of a set of polyene chains with one of the end groups consisting of a C=O group which not only does take part in the conjugation but also p…
The following studies report the inhibitory effect produced by chemical constituents of essential oils of three plants used in traditional medicine as anti-inflammatory and analgesic drugs, in vitro, on soybean lipoxygenase L-1 and cyclooxygenase function of prostaglandin H synthase (PGHS), the two enzymes involved in…
We examine the effect of antisite disorder on the magnetic properties of ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ by means of Monte Carlo simulation of a physically reasonable model that takes into account the origin of the ferromagnetic interactions between Fe ions. With this model, the main experimental features foun…
The density of vibrational states in the terahertz regime of ethanol in both the structural glass and the glassy crystal has been extracted from low-temperature specific heat data published previously via the Tikhonov regulation method. In addition, low-frequency light-scattering (LS) spectra (boson peak) have been me…
Abstract FT-IR and theoretical studies of the d6 and d7-porphyrin carbene complexes revealed that the metal–Ccarbene bond is a double bond in the singlet state, while the metal–Ccarbene bond is a single bond in the multiplet state. Since the radical on the Ccarbene delocalized to the α-carbonyl group, the stretching o…
Charge transfer mechanisms of several conducting polymers and polymer/CdSe nanocrystal composites (hybrid bulk heterojunction composites) were investigated by means of cyclic voltammetry. Potential application of these composites in hybrid light-emitting diodes was discussed. It was found that charge transfer is obser…
The role of mobile interstitial oxygen atoms (${\mathrm{O}}^{0}$) in defect processes in oxides is demonstrated by interconversion between the oxygen dangling bond and the peroxy radical (POR) in ${\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$ glass. Superstoichiometric ${\mathrm{O}}^{0}$ was created by ${\mathrm{F}}_{2}$ lase…
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