Materials Literature
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In thin films of rare‐earth manganites, RE 1− x M x MnO 3 (RE=rare earth, M=Ca, Sr, Ba), with mixed‐valence perovskite structure, the transport properties highly depend on the deposition technique, processing conditions, and the substrate used. Chemical solution deposition techniques provide many advantages, such as l…
The adsorption and catalytic degradation of nitrosamines by zeolite A with cesium, potassium, sodium, or calcium cation was systemically studied in the research reported in this article. The results of instantaneous adsorption, temperature-programmed surface reaction, and in situ Fourier transform infrared spectroscop…
The emerging interest toward applications of robust highly aligned carbon nanotube forests requires synthesis of such films in a controlled manner. In this paper, the growth mechanism and influence of growth parameters on the structural properties of multiwalled carbon nanotube films grown by catalytic chemical vapor…
Abstract In this study, layered clay/polymer nanocomposites were developed based on epoxy resins and montmorillonite as the nanoplatelet reinforcement. Clay particles were treated with hexadecyltrimethylammonium chloride (HTCA) through an ion exchange reaction. In this way, Na + interlayer cations of the clay is excha…
Projected trends for capacitors include increasing capacitance density and decreasing operating voltages, dielectric thickness and process cost. Advances in the fabrication and processing of barium strontium titanate (BST) and lead zirconate titanate (PZT)‐based thin films are presented toward attaining these goals in…
The surface plasmon resonance (SPR) band of Au nanoparticles embedded in an YSZ matrix was monitored at 500 °C under varying gas exposure concentrations of H 2 and O 2 in N 2 . Because the peak position of the SPR band relies closely on the number of driven oscillating free electrons per gold nanoparticle, we were abl…
Large-scale synthesis of semiconductor nanocrystals or quantum dots (QDs) with high concentration and high yield through simultaneously increasing the precursor concentration was introduced. This synthetic route conducted in diesel has produced gram-scale CdSe semiconductor quantum dots (In optimal scale-up synthetic…
The encapsulation of living cells in materials with good optical and mechanical properties often produces death or stress due to the release of toxic byproducts originated during the synthesis. We present here a method to assess the cellular stress that silica entrapment exerts over living cells taking into account th…
There is experimental evidence that nitrogen forms a polymeric solid under pressure. In this study, we compare various solid nitrogen phases by means of ab initio calculations based on density-functional theory to describe solid nitrogen at different pressures. We show that two phases with covalent bonds in all three…
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…