Materials Literature
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We demonstrate a simple and versatile approach to produce hierarchical assemblies of nanoparticles by combining block copolymers and small molecules. Directed nanoparticle assemblies can be achieved with a variety of nanoparticles and small molecules without modification of the nanoparticle ligands. This novel approac…
Cryochemical modification is a method of micronization and changing of the crystalline structure of organic substances that in application with drug substances may lead to the improvement of their biopharmacological properties. This method was successfully developed for a chemically labile compound named gabapentin [1…
A series of SAPO-34 materials were synthesized hydrothermally in the presence of mixed templating agent (named TEDE) of tetraethyl ammonium hydroxide (TEAOH) and diethylamine (DEA). The effects of template amount, SiO2/Al2O3 and P2O5/Al2O3 molar ratios and the crystallization temperature on the structure and acidity w…
A mathematical model for the combustion of composite solid propellants based on ammonium perchlorate in oil wells is constructed, and the effect of the propagation of the front of pressure, temperature, and gaseous combustion products is estimated. An analysis of the results of modeling is performed, and inferences ab…
The two-dimensional scattering problem of a perfectly conducting cylinder S of arbitrary cross section is examined using the T-matrix method. Both the TM-polarization and the TE-polarization are considered by imposing homogeneous Dirichlet and Neumann boundary conditions on S, respectively. Explicit expressions for th…
The results of calculating the lifetimes of direct electron and hole tunneling and of nonradiative exciton transport between Si nanocrystals are presented. It is shown that tunnel transitions dominate in the process of the energy exchange between quantum dots and can considerably affect radiation in the ensemble of Si…
Pure zirconia, sulfated zirconia and sulfated zirconia modified with 2, 3, 5 and 10 wt. % of cerium oxide were synthesized by sol-gel method. Pt phase was impregnated on the supports using the incipient wet technique. Sulfated zirconium oxide showed tetragonal phase only. Addition of cerium to sulfated zirconia did no…
The polytypism of layered crystals of thallium gallium diselenide TlGaSe2 has been found to substantially affect the temperature of phase transformations and the mechanism of formation of the polar state in these ferroelectrics. In particular, it is shown that the phase transition observed in the C-TlGaSe2 polytype is…
Results related to synthesis, characterization and applications of Ag nanoclusters for Si porosification and SnO2-based gas sensors optimization are presented in given report. It is shown that concentration and size of the silver nanoparticles deposited on a surface of monocrystalline silicon can be controlled by SILD…
Features of the orbital and spin dynamics of ferromagnets irradiated by femtosecond laser pulses are discussed. A model in which only the orbital momenta of the electrons can change during femtosecond optical pumping is used. The spins undergo reorientation over the subnanosecond times characteristic of spin dynamics…
Wear behavior of WC based nanocomposite cutting tool when high speed cutting ductile cast iron was investigated. Orthogonal cutting tests were carried out on a CA6140 lathe using three speeds, namely, 100, 215 and 287m min-1. The WC based nanocomposite tool is found to be superior to cemented carbide tools (YG8). The…
It has analyzed reasons of high-speed dry cutting technology production and application in gear processing. It enumerates the comparisons between dry cutting technology and traditional processing. It has the merits of space and energy consuming, unit production cost, occupation area, processing time and so on. The exp…
Mechanical simulation and modeling play increasingly important roles in semiconductor industry. It provides guidelines on material selection, package geometry configuration, and package platform selection. It also provides insights and predictions on package reliability and failure mechanisms. Many mechanical models o…
The present work, the HPA Keggin structure was supported on four different MCM phase types (hexagonal, spherical, elliptical, and cubic); their catalytic properties were tested in the alkylation of benzene with propylene in order to produce cumene. In the reaction, parameters like propylene flow, reaction temperature,…
The singularities in the fields and polarization densities at the inner surfaces of spherical and circular cylindrical cloaks illuminated by sources inside their cavities are shown to obey generalized electromagnetic boundary conditions that are derived for interfaces containing surface layers of electric and magnetic…
Chalcogenide phase change material Ge1Sb2Te4 (GST) nanoparticle arrays with long-range-order were fabricated by using a monolayer of self-assembled polystyrene (PS) spheres as mask. The morphology of nanoparticle arrays can be controlled via changing RIE processing conditions. Images of atomic force microscopy (AFM) a…
The major solving ways for the material wear are surface modification and lubrication. However, the application of only one solution can not achieve desirable effect. Ni–W–P alloy coating has high hardness and high wear resistance, and is an effect way of surface modification on the 45 steel. In the friction process,…
Some alloy elements were added to Sn-0.7Ag-0.5Cu solder, to fabricate two new solders, Sn-0.7Ag-0.5Cu-0.05Ni-XBi(X=0, 2.0, 2.5, 3.0, 3.5, 4.0 wt%) and Sn-0.7Ag-0.5Cu-XIn(X=0, 0.2, 0.5, 0.8, 1.0, 1.2, 1.5, 1.8 and 2.0 wt %). The solderability tests of the two solder alloys have been conducted to study effect of bismuth…
Controlling the size, shape, and structure of metal nanoparticles is very important because of the strong correlation between these parameters and their resulting optical, electrical, and catalytic properties. This paper describes a directed calcium chloride coalescence method, based upon incubating a silver colloid w…
Resistivity ρ and the Hall coefficient R H at atmospheric pressure in the temperature range of 77–400 K and the dependences of these parameters (ρ(P) and R H(P)) and magnetic susceptibility (χ(P)) on hydrostatic pressures of up to P ≤ 7 GPa at 300 K in p-InAs〈Mn〉 single crystals was investigated. The baric coefficient…