Materials Literature
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The objectives of this work were to study the addition of sulfur and nitrogen containing compounds to the fuel before the combustion, to examine their capacity for preventing PCDD/F emissions, to investigate their influence on the PCDD/F homologue patterns and to determine the most effective additive concentration use…
The catalysis by an immobilized preparation of Candida antartica lipase B (Novozyme-435) of transesterification or transacylation between poly(ε-caprolactone), PCL, and poly(ω-pentadecalactone), PPDL, was studied. These reactions between macromolecules were performed in toluene or without solvent (bulk) at 70−75 °C. I…
The introduction, within a π-conjugated donor−acceptor molecule, of an intermediate barrier to electron tunneling and its size scaling and influence on electronic polarization properties have remained so far elusive issues of great potential interest toward the fine-tuning of the linear and nonlinear optical propertie…
Lead sulfide, PbS, nanoparticles have been synthesized using a number of surface capping agents including poly(vinyl-alcohol) (PVA), poly(vinyl-pyrrolidone) PVP, gelatin, DNA, polystyrene (PS), and poly(methyl-methacrylate) (PMMA). The electronic absorption spectra and particle shapes have been found to depend on the…
We develop a theory of laser beam generation of shift currents in non-centrosymmetric semiconductors. The currents originate when the excited electrons transfer between different bands or scatter inside these bands, and asymmetrically shift their centers of mass in elementary cells. Quantum kinetic equations for hot-c…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLight-Driven Molecular Rotor: Unidirectional Rotation Controlled by a Single Stereogenic CenterNagatoshi Koumura, Edzard M. Geertsema, Auke Meetsma, and Ben L. FeringaView Author Information Department of Organic and Molecular Inorganic Chemistry Stratingh Institute, U…
Materials showing long-range two-dimensional hexagonal order (called SBA-15 in the literature) were produced by templating a silica precursor (TEOS) with two Pluronic copolymers, EO x PO y EO x, of nearly the same x / y (0.3) ratio but different y values ( x = 18, y = 60 and x = 20, y = 70, respectively). These materi…
Strand exchange between two duplexes is usually initiated as a three-strand event that requires the presence of a single-stranded overhang or gap in one of the two molecules. Here we show that the RecA protein can catalyze a four-strand exchange. Specifically, it can recombine short hairpin substrates with homologous…
Novel hybrid polymeric systems with noble metal nanoparticles located inside specific areas of the material were developed. A self-assembled multilayered polymer, poly(octadecylsiloxane) (PODS), provided a nanostructured matrix for incorporation of gold and platinum compounds and for metal nanoparticle formation. The…
Spherical silicalite/γ-Al 2 O 3 composite granules of about 2 mm in diameter were prepared by a sol−gel process from a mixture of the stable boehmite and silicalite sols. The stable silicalite sol was prepared by a hydrothermal method. Silicalite/γ-Al 2 O 3 composite granules with a zeolite content of up to 70 wt % we…
The equilibrium distribution of a fluid phase in a rock is controlled by the ratio of grain boundary energy to solid‐fluid interfacial energy (“surface energy”). A strong dependence of interfacial energy on interface orientation (anisotropy) is the rule for solid‐fluid surfaces of geological interest. We investigated…
Addition of a phenyl Grignard reagent to a toluene solution of the nickel(II) chloride complex of a dimethylated inverted porphyrin, (2-NCH3-21-CH3CTPP)NiIICl (1), at 203 K results in the formation of a rare paramagnetic (sigma-phenyl)nickel(II) species, (2-NCH3-21-CH3CTPP)NiIIPh (2). The coordination of the sigma-phe…
The bond distance and vibrational spectrum of the chromate(VI) ion has been calculated using HF-SCF and SCF-density functional (SCF-DFT) methods in conjunction with a wide range of basis sets. It was found that the B3-LYP/LanL2DZ combination gave the best fit for the observed vibrational spectrum. The molecular geomet…
This work reports that the optimum diamond grain size can be controlled by adjusting the flow rate of Ar/H 2 in the reaction chamber through orthogonal optimization. The dielectric properties of the diamond films were investigated using an RCL (resistance-capacitance-inductance) meter. It was found that (i) the domina…
This is the first time that the adsorption of phenanthrene (Phe) for hot gas emissions cleaning from combustion has been studied. For this goal, the adsorption capacity of 10 active carbons with different origins and a wide range of textural characteristics has been assessed for Phe removal from hot gas emissions. The…
Highly c -axis orientated growth nano-crystalline V 2 O 5 films were successfully synthesized on In 2 O 3 :SnO 2 glass by using the laser ablation technique at deposition temperatures as low as 200°C. The structural properties of as-deposited and annealed VO x thin films were analysed using the scanning accessory of a…
The synthesis, spectroscopic characterization, and electrochemistry of five new phosphorus corroles are reported. The investigated complexes contain alkyl, aryl, oxo, or hydrido axial ligands and are represented as (OEC)P(H)2, (OEC)P(CH3)2, (OEC)P(C6H5)2, (OEC)P=O, and [(OEC)P(CH3)]+ClO4-, where OEC is the trianion of…
This paper describes gold, silver, and palladium nanoparticles coated with monolayers of trimethyl(mercaptoundecyl)ammonium ligands. The monolayer-protected clusters (MPCs) are synthesized in aqueous medium and are water soluble. In dry films, their highly charged surfaces inhibit the interdigitation of monolayer chai…
We consider the dynamics of lattices which have constrained constitutive units flexible in only their mutual orientations. A continuum description is derived through which it is shown that the models have zero shear velocity, free-particle like internal rotational modes and volume decreasing linearly with temperature.…
The accuracy of equation-of-state formulations is compared for theoretical total energies or experimental pressure-volume measurements for H$_{2}$, Ne, Pt, and Ta. This spans the entire range of compression found for minerals and vo latiles in the Earth. The Vinet equation is found to be most accurate. The origin of t…