Materials Literature
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We study the kinetics of the release of monodisperse water-in-oil-in-water double emulsions in the regime dominated by coalescence of the internal aqueous droplets onto the globule interface. By measuring the rate of release of adsorbed droplets, we directly determine the average lifetime of the thin film that forms b…
[structure: see text]. In the stoichiometric asymmetric epoxidation of E-beta-methylstyrene with cationic chromium-salen oxo complexes, enantioselectivity is increased by halo-substitution at the 3,3'- and 6,6'-positions and decreased at the 4,4'- and 5,5'-positions on the salen rings. Addition of triphenylphosphine o…
NbS2 nanotubes/rods have been generated successfully employing carbon nanotube template promoted growth; high resolution transmission electron microscopy, coupled with EDX analysis, confirm the template effect and existence of NbS2 tube structures.
The adsorption of 1/3 monolayer of the group-III elements B, Al, Ga, and In on a Si-terminated $\mathrm{SiC}(111)\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}\mathrm{R}30\ifmmode^\circ\else\textdegree\fi{}$ surface is investigated in dependence on the surface preparation conditions using the density functional th…
Abstract The intermolecular hydrogen‐bonding interaction and miscibility between enzymatically prepared novel polyphenols [poly(bisphenol A) and poly( p ‐ tert ‐butyl phenol)] and poly(ε‐caprolactone) (PCL) were investigated as a function of composition by Fourier transform infrared spectroscopy (FTIR) and DSC. The bl…
Abstract Three new bis(ether‐acyl chloride) monomers, 1,1‐bis[4‐(4‐chloroformylphenoxy)phenyl]cyclohexane ( 1a ), 5,5‐bis[4‐(4‐chloroformylphenoxy)phenyl]‐4,7‐methanohexahydroindan ( 1b ), and 9,9‐bis[4‐(4‐chloroformylphenoxy)phenyl]fluorene ( 1c ), were synthesized from readily available compounds. Aromatic polybenzo…
Transport of Na + and Li + under the influence of an electric field in twinned quartz is simulated using molecular dynamics techniques. Comparison between bulk transport and transport along twin boundaries shows that the cations are trapped inside twin walls for weak fields along the crystallographic c -axis. Stronger…
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The crystal structure of a hydrated crystal of bis(squaryl)biphenyl (BSQB*4H2O), in which two squaric acid moieties are connected with a 4,4'-biphenyl unit, was characterized by the presence of a one-dimensional hydrogen-bonded chain composed of BSQB and water molecules. X-ray crystallographic analysis showed that BSQ…
Magnetic domain walls in ferromagnetic ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ films ${(T}_{C}\ensuremath{\sim}260\mathrm{K})$ have been studied in the transmission electron microscope. Epitaxial films grown on ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{NdGaO}}_{3}$ substrates were prepared using a focuse…
Natural phosphate is basic enough to promote the epoxidation of electron-deficient alkenes with dilute aqueous hydrogen peroxide. A simple modification with sodium nitrate leads to the probably most active, water compatible and recyclable basic catalyst described for this reaction. It promotes the epoxidation of a lar…
Pressure-induced amorphization of materials with negative thermal expansion is believed to arise from uncorrelated tiltings of polyhedra, kinetically frozen in an orientationally disordered state at room temperature. The transition to an amorphous phase in zircon tungstate ZrW 2 O 8 occurs above 1.5 GPa upon cold comp…
Removal of NOx (NO in the presence of O2) by CeO2–ZrO2 binary oxides was investigated. CeO2–ZrO2 prepared by a modified sol–gel method [CZ(SG)] showed high NOx sorption capacity, while CeO2–ZrO2 prepared by a coprecipitation method [CZ(CP)] was not effective. In both cases, NOx was found to be removed by adsorption on…
Above the semiconductor-to-metallic transition (SMT) temperature ( T p ), transport properties of the La 1− x Pb x MnO 3+δ (0 ≤ x ≤ 0.5)-type mixed valence oxides with T p between 230 and 275 K (depending on x ) have been thoroughly examined for a small-polaron hopping conduction mechanism of the carriers. Although th…
Abstract Liquid‐crystalline (LC) hybrid polymers with functionalized silsesquioxanes with various proportions of LC monomer were synthesized by the reaction of polyhedral oligomeric silsesquioxane (POSS) macromonomer with methacrylate monomer having an LC moiety under common free‐radical conditions. The obtained LC hy…
A one-pot synthesis is reported of water-soluble cadmium sulfide nanoclusters capped with cysteine ester, with an average size of 2.0 nm and fluorescing in the blue region, establishing the possibility of using these as fluorescent biological probes.
The molecular structures, the nuclear magnetic shieldings, and the aromatic ring-current shieldings (ARCS) have been calculated for Al 4 2-, Al 4 Li -, and Al 4 Cu - at the Hartree−Fock (HF) level, the second-order Møller−Plesset (MP2) level, the coupled-cluster singles and doubles (CCSD) level, and the coupled-cluste…
The effect of microbial control of souring on the extent of corrosion was studied in a model system consisting of pure cultures of the nitrate-reducing, sulfide-oxidizing bacterium (NR-SOB) Thiomicrospira sp. strain CVO and the sulfate-reducing bacterium (SRB) Desulfovibrio sp. strain Lac6, as well as in an SRB consor…
This paper presents general methods of preparing three-dimensionally ordered macroporous (3DOM) metals or alloys via templated precipitation and subsequent chemical conversion of metal salts (acetates, oxalates) within colloidal crystals of poly(methyl methacrylate) (PMMA) or polystyrene (PS) spheres. Three approaches…
MoSe2 and WSe2 nanotubes are obtained by the reduction of the corresponding triselenides in hydrogen or by the decomposition of the ammonium selenometallates in a hydrogen atmosphere.