Materials Literature
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The kinetics and mechanism of the sonolytic degradation of methyl tert -butyl ether (MTBE) have been investigated at an ultrasonic frequency of 205 kHz and power of 200 W L - 1 . The observed first-order degradation rate constant for the loss of MTBE increased from 4.1 × 10 - 4 s - 1 to 8.5 × 10 - 4 s - 1 as the conce…
The magnetic interaction in a series of isomorphous Cu2+–Ln3+ complexes (1) is antiferromagnetic for LnCe, Nd, Sm, Tm, Yb and ferromagnetic for Ln=Gd, Tb, Dy, Ho, Er, while no interaction is operative for Ln=La, Pr, Eu, Lu.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Role of Bridging Ligands in Controlling Electronic and Magnetic Properties in Polynuclear ComplexesJon A. McCleverty and Michael D. WardView Author Information School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, U.K. Cite this: Acc. Chem. Res. 19…
Exact control of the film thickness of polyelectrolyte shells (a transmission electron microscopy image is shown) is achieved by colloid-templated consecutive adsorption of polyanions and polycations followed by decomposition of the templating core. Possible areas of application for these shells range from the pharmac…
The main part of the VOCs (volatile organic compounds) contained in diesel exhaust (≈80%) is oxidized to CO and CO 2 over an SCR (selective catalytic reduction) catalyst. CO is the major product of this oxidation, representing about 50−70% of the formed products (CO + CO 2 ). This preferential formation of CO leads to…
The presence of carbonaceous contamination on common surface-enhanced Raman scattering (SERS) surfaces has been a primary limitation to the analytical utility of SERS; background contamination significantly affects reproducibility and often determines the limit of detection. Due to the strong interaction between thiol…
The synthesis of 16,20-dipropyl-2,3,6,7,10,11,15,21-octamethyl-[22]pentaphyrin-(1.1.1.0.0) (8), a stable isomer of smaragdyrin ([22]pentaphyrin(1.1.0.1.0)), and 9, a furan-containing analogue of 8, are reported. These two new expanded porphyrins were characterized in solution using UV-vis and (1)H and (13)C NMR spectr…
Surface-enhanced Raman scattering is used to determine the potential-dependent orientation of 1- and 2-methylimidazole on Ag electrodes. Frequency shifts resulting from adsorption and potential changes suggest adsorption of these molecules through the pyridine nitrogen at positively charged surfaces. Unique ν(CH 3 ) f…
The resistance against rolling of a rigid cylinder on a flat viscous surface is investigated. We found that the rolling-friction coefficient reveals strongly non-linear dependence on the cylinder's velocity. For low velocity the rolling-friction coefficient rises with velocity due to increasing deformation rate of the…
Starting from the conventional electron-hole Hamiltonian ${\cal H}_{eh}$, we derive an effective Hamiltonian $\tilde{\cal H}_{1s}$ for $1s$ excitons with spin degrees of freedom. The Hamiltonian describes optical processes close to the exciton resonance for the case of weak excitation. We show that straightforward bos…
The anomalous plasmon linewidth dispersion (PLD) measured in K by vom Felde, Sprosser-Prou, and Fink (Phys. Rev. B 40, 10181 (1989)), has been attributed to strong dynamical electron-electron correlations. On the basis of ab initio response calculations, and detailed comparison with experiment, we show that the PLD of…
The experimental observation of a three-dimensional diffraction phenomenon at a 90° Bragg reflection is reported and discussed. A refined experimental technique for the direct observation and accurate measurement of scattered intensity profiles in the vicinity of a 90° Bragg reflection was proposed and implemented. Th…
Since the invention of polyester fibre, the demand presented. for this versatile fibre is enonnously increasing. . Polyester fibre has very good strength and resilience 2 MaterIals and Methods .. properties. However, because of some limitations in For the laboratory blend preparation, unfinIshed the wearing comforts a…
The design of condensers used to reflux boiling chloride solutions for stress corrosion tests on stainless alloys was shown to have a significant effect on time to cracking. This effect resulted from the different steady-state concentrations of oxygen produced by various types of condensers. The condenser that provide…
This study investigated use of a continuous hybrid microwave heating process for producing rapid and uniform heating of cryopreserved tissues. This process combines volumetric energy deposition by microwaves with convective surface heating to produce increased warming rates. Moreover, such as a combination of heating…
The physical, chemical, and electrical quality of the bottom electrode plays a key role in the fabrication of ferroelectric capacitors. In this article, we have used x-ray diffraction and transmission electron microscopy to study the stability of the Pt/TiN/Ti/SiO2/Si stack before PZT film investigations. The Pt layer…
The structure, resistivity and ESR of a new molecular charge transfer salt β-(salt (BEDT-TTF)4 • H2O • Fe(C2O4)3 • C6H5NO2 (BEDT-TTF = bis (ethylenedithio)tetrathiofulvalene) are studied. The structure of the salt consists of successive layers of BEDT-TTF which are packed according to β-type and layers of approximatel…
Abstract CaNi5, a hydrogen absorbing alloy, has been applied for the complete decomposition and regerneration of methane. The complete decomposition of methane was realized at 773∼873K over CaNi5 when the amount of methane introduced had been less than 800 μmol·g-CaNi5−1. The complete recovery of methane was observed…
Two mesogenic homologous series are synthesised, by fixing a rigid 4′-propiophenone group to 4-Hydroxy phenyl azo moiety. The hydroxy group is etherified and esterified by n-alkyl chains and 4-n-alkoxy benzoyl groups respectively. The etherified series (I) viz: 4-n-alkoxy phenyl azo 4′-propiophenones exhibit nematic p…
The development of third-generation synchrotron sources has stimulated efforts toward high-resolution monochromators. A good knowledge of grating efficiency is needed to achieve an optimal compromise between resolution and photon flux. Because simple geometric models fail to describe correctly the gratings properties…