Materials Literature
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Abnormal grain growth in the presence of second phase particles is investigated with the help of a two-dimensional Monte Carlo simulation. An aggregate of equiaxed grains is considered with constant grain boundary energy and mobility. The only driving force accounted for stems from the grain boundary curvature. The pr…
Experimental osmotic second virial coefficients are reported for polystyrene in toluene (good solvent), cyclohexane (ϑ solvent) and methylcyclohexane (poor solvent) in the temperature range 10−60 ° C. The ϑ temperature for eight-arm star polystyrene in methylcyclohexane is 29 ± 3 ° C. Intrinsic viscosity for polystyre…
The design of the multilayer coatings and multilayer grating for the EIS spectrometer is presented. The grating substrate has a rectangular laminar groove profile with 4200 grooves/mm and a 58 angstrom groove depth. The grating and mirror have two multilayer coatings, each covering half of the areas of the grating and…
The visible luminescence of Pr 3+ -doped lead-germanate glass of composition (in mol%) 60GeO 2 -25PbO-15Nb 2 O 5 has been investigated for different Pr 3+ concentrations and temperatures by using steady-state and time-resolved laser spectroscopy. The fluorescence from the 1 D 2 level shows a strong concentration quenc…
Pulse radiolytically generated (SCN) 2 •- radicals bind strongly to the gold nanoparticle surface, with an apparent equilibrium constant of 4.7 × 10 3 M -1 . The resultant complex has a strong absorption band at 390 nm which quickly undergoes chemical changes to yield an oxidation product, [Au(SCN) 2 ] -, with an abso…
High-pressure, low-angle X-ray diffraction is used to examine the compressibility of periodic hexagonal, surfactant-templated silicas. Mesoscopic order in these materials can be retained up to 12 GPa, and pressure-induced distortions are reversible. Postsynthetic treatments can greatly enhance the mechanical propertie…
The magnetic properties of Sr 2 FeMoO 6 oxides are investigated over a broad temperature range extending from 10 K to 800 K. It is found that the magnetization fully saturates at low temperatures at a value of 3.75 µ B . In the paramagnetic regime, above the Curie temperature ( T C ≈420 K), the magnetic susceptibility…
Repeated bilayers of a polycation and a polyanion were assembled by adsorption from their aqueous solutions. The polycations used were PEI (poly(ethylenimine)), PAH (poly(allylamine hydrochloride)), and generation 3.0 dendrimer (poly(propylenimine)). The polyanion was PAZO (poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benz…
Mixed-valence manganites Ln 1- x A x MnO 3 exhibit complicated transport behaviour resulting from complex interplays among charge, spin and lattice. In the paramagnetic phase, the carriers are trapped in localized states as small polarons due to the incorporation of three different localization features: (i) strong el…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBis(azafulvene) as a Versatile Building Block for Giant Cyclopolypyrroles: X-ray Crystal Structure of [64]Hexadecaphyrin(1.0.1.0.1.0.1.0.1.0.1.0.1.0.1.0)Jun-ichiro Setsune and Satoshi MaedaView Author Information Department of Chemistry, Faculty of Science and Graduate…
Enzymatic synthesis of a conducting complex of polyaniline (PANI)−poly(vinylphosphonic acid) (PVP) is presented. The polymerization of aniline was carried out in an aqueous buffer at pH 4.0 using the enzyme horseradish peroxidase (HRP) as the biocatalyst in the presence of a PVP polyanion template. The formation of th…
Various chromium-containing catalysts were tested for the total oxidation of trichloroethylene (TCE) as a model reaction for the catalytic combustion of chlorinated organic pollutants. A spinel-type cobalt chromite (CoCr2O4) among others was proven to be a very promising catalyst showing higher activity and higher CO2…
We have functionalized poly( N -vinyl carbazole) (PVK) by controlled sulfonation. CdS nanocystals of 3−20 nm across were synthesized in the sulfonated PVK matrix with the CdS molar fraction of ∼1−18%. The CdS nanoparticle size increased with the molar fraction of CdS. At high CdS molar fractions, the CdS nanocrystals…
The modern multi-polaron theory predicts a polaronic Fermi-liquid state, but such a state has not been unambigously confirmed by experiment so far. Here we report theoretical and experimental studies of the isotope effects on the low temperature kinetic properties of the doped ferromagnetic manganites. Our results pro…
The study of metallomesogens has added several new dimensions to the wider field of liquid crystals. In this Account, just one family of complexes is considered, namely alkoxystilbazole complexes of various silver(I) salts. These complexes show an incredibly rich and diverse mesomorphism ranging from nematic and smect…
We present a calculation of the change of free energy of a solid surface upon bending of the solid. It is based on extracting the surface stress through a molecular dynamics simulation of a bent slab by using a generalized stress theorem formula, and subsequent integration of the stress with respect to strain as a fun…
Thin layer electrodes (0.2−0.5 μm) of highly organized nanotextured anatase were prepared by hydrolysis of TiCl 4 in the presence of poly(alkylene oxide) block copolymer, Pluronic P-123, acting as the structure-directing agent. Electrochemical properties of these layers were studied in KCF 3 SO 3 + propylene carbonate…
Palladium nanoparticles (2−3 nm in diameter) have been prepared within covalently functionalized poly(propylene imine) (PPI) dendrimers, and the resulting composite materials are shown to be effective for Heck coupling reactions. Two novel concepts are demonstrated in this report. The first concept involves the incorp…
The interrelation between particle size, crystal structure and optical properties in semiconductor quantum dots has elicited widespread interest. We report the first attempt at relating the size-induced transformation from a hexagonal to a cubic structure in CdS nanoparticles to a change in the band gap. CdS nanoparti…
Silver complexes of poly(amidoamine) (PAMAM) dendrimers as well as different {silver−PAMAM} dendrimer nanocomposite solutions have been tested in vitro against Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli bacteria, using the standard agar overlay method. Both PAMAM silver salts and nanocomposite…