Materials Literature
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Abstract A series of mixed oxides supported on TiO 2 (Mn 1−y Cu y O x /TiO 2 ) synthesized by incipient wetness impregnation method have been characterized and tested for toluene oxidation volatile organic compounds (model). For all catalysts, the total conversion (100%) of toluene into CO 2 was obtained at temperatur…
Multigram quantities of manganese oxide (K-OMS-2) nanomaterials in the size range of 4−20 nm and with very high surface areas up to 227 m 2 /g were produced rapidly via microwave-reflux route with use of mixed aqueous and nonaqueous solvents. The formation process, particle size, crystallite size, crystal structure, a…
BACKGROUND: Different types of carbon nanotubes may represent toxic hazards due to their size distribution and massive surface area. They may adsorb other toxic agents that can consequently be transported into the body. The aim of the present study was to determine the possible genotoxicity of carbon nanotubes. MATERI…
A simple aqueous synthesis yielded about 100 times more structurally well-organized single-walled aluminogermanate nanotubes than previously reported "standard" procedures. The structure analyses using XRD, IRTF, TEM, and XAS were greatly facilitated by the high concentrations available, and they ascertained the imogo…
We present a study on dynamic capillary wetting in the framework of dissipative particle dynamics (DPD) based on a novel wall model for wetting on solid boundaries. We consider capillary impregnation of a slit pore in two situations: (i) forced (piston-driven) steady state flow and (ii) capillarity driven imbibition o…
We present a linear scaling ab initio total energy electronic structure calculation method, which is simple to implement, easily to parallelize, and produces essentially the same results as the direct ab initio method, while it could be thousands of times faster. Using this method, we have studied the dipole moments o…
Abstract An experimental study was carried out to design polylactide (PLA)‐clay nanocomposites for developing fibers. PLA and 1–10 wt % of a selected organomodified bentonite (Bentone® 104‐B104) were melt mixed to examine the effect of processing conditions (temperature, shear, residence time) on the morphology of per…
A novel C3 symmetric discotic hexa-peri-hexabenzocoronene with three alternating dodecyl and methoxy substituents was synthesized. The compound revealed pronounced self-aggregation in solution. The solution processing onto a substrate resulted in the formation of long fibrous nanostructures. Additionally, a complex he…
The mechanical behavior of four rare earth (RE)‐Mg‐doped Si 3 N 4 ceramics (RE=La, Lu, Y, Yb) with varying grain‐boundary adhesion has been examined with emphasis on materials containing La and Lu (which represent the extremes of RE ionic radius). Fracture‐resistance curves ( R ‐curves) for all ceramics rose very stee…
Application of magnetic field ( H ) can produce the ferroelectric polarization ( P ) in a proper screw helimagnet, ZnCr 2 Se 4 . While rotating H , we observed the cyclic generation of polarization current arising from the change of P in the conical spin structure. Versatile variations of P in magnitude and sign are o…
Escaping the cage: Retinoic acid (RA), a crucial signaling molecule for the embryogenesis of vertebrates, can be photoreleased from a simple caged derivative (cRA) upon illumination. In zebrafish embryos, cRA causes RA-induced phenotypes with one- and two-photon excitation (see picture), which opens a route to the non…
This paper presents a systematic study of the galvanic replacement reaction between 23.5 nm single-crystal Ag nanospheres and HAuCl(4) in an aqueous medium. We have monitored both morphological and spectral changes as the molar ratio of HAuCl(4) to Ag is increased. The replacement reaction on single-crystal Ag nanosph…
The spiders Cupiennius salei and Achaearanea tepidariorum are firmly established laboratory models that have already contributed greatly to answering evolutionary developmental questions. Here we appraise why these animals are such useful models from phylogeny, natural history and embryogenesis to the tools available…
Colloidal InP/ZnS core−shell nanocrystals were prepared via a non-organometallic approach in a non-coordinating solvent. The energy shift and line broadening of the e 1 −h 1 (HOMO−LUMO) transition have been investigated using photoluminescence studies in the temperature range 300−525 K. The energy of the e 1 −h 1 tran…
The growth of single crystal particles of SBA-15 is explained. The morphology and size of the particles are highly dependent on synthesis temperature. The formation at certain temperatures proceeds via an oriented aggregation mechanism of primary particles into secondary (final) particles. Platelike SBA-15 particles w…
Organically modified carbon nanotubes serve as intermediate substrate for further functionalization with a perfluoroalkylsilane toward a superhydrophobic core–shell hybrid that is additionally soluble in certain solvents. On account of these properties, the hybrid can be easily blended with polymers or impregnated on…
This paper addresses the high‐temperature instability of Li‐ and Ta‐modified (K,Na)NbO 3 piezoceramics. The grains with abnormal size evolve out of the fine matrix grains during high‐temperature annealing. They are found to be precipitates with a tetragonal tungsten bronze structure, which result from the volatilizati…
The nitric acid oxidation followed by sodium hydroxide washing was applied for functionalization of single-walled carbon nanotubes (SWCNTs), few-walled CNTs (FWCNTs), and multiwalled CNTs (MWCNTs). The surface functionalization of CNTs via acidic oxidation was studied by transmission electron microscopy, Raman scatter…
We formulate an effective model for B-B' site ordering in double perovskite materials A_2BB'O_6. Even within the simple framework of lattice-gas type models, we are able to address several experimentally observed issues including nonmonotonic dependence of the degree of order on annealing temperature, and the rapid de…
Using first principles electronic structure methods, we calculate the effects of boron impurities in bulk copper and at surfaces and grain boundaries. We find that boron segregation to the $\ensuremath{\Sigma}5(310)[001]$ grain boundary should strengthen the boundary up to 1.5 ML coverage $(15.24\phantom{\rule{0.3em}{…