Materials Literature
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Herein we present, to the best of our knowledge, the first report of effective silylation of raw, pristine single-walled carbon nanotubes (SWNTs). Specifically, commercially available CoMoCAT SWNTs were functionalized at their ends and sidewalls (a) with trimethoxysilane and in a separate experiment, (b) with hexaphen…
Five novel polyoxometalate compounds built on the lacunary Keggin-type polyanion [GeW 11 O 39 ] 8- and trivalent rare earth ions (M = Nd, Sm, Y, Yb), [(CH 3 ) 4 N] 2 H 1.50 [Nd 1.50 (GeW 11 O 39 )(H 2 O) 6 ]·3H 2 O ( 1 ), [(CH 3 ) 4 N] 2 H 2.25 [Sm 1.25 (GeW 11 O 39 ) (H 2 O) 4 ]·3.75H 2 O ( 2 ), [(CH 3 ) 4 N] 2.50 H…
The syntheses and crystal structures of a series of zirconium(IV) and hafnium(IV) complexes with Dawson monovacant phosphotungstate [alpha2-P2W17O61](10-) and in situ-generated Keggin monovacant phosphotungstate [alpha-PW11O39](7-), which was obtained by a reaction of [alpha-PW12O40](3-) with Na2CO3, are described. K1…
Isothermal-isobaric molecular dynamics simulations are used to calculate the specific volume of models of different amorphous carbohydrates (glucose, sucrose, and trehalose) as a function of temperature. Plots of specific volume vs temperature exhibit a characteristic change in slope when the amorphous systems change…
Shape-controlled synthesis of metal nanostructures has opened many new possibilities to design ideal building blocks for future nanodevices. In this work, new types of monodisperse silver nanoplates with complex shapes, namely, a disklike shape and flowerlike shapes, were controllably synthesized in high yield by redu…
The binding of RGD peptides to integrins offers an excellent system to study the multivalent mediated changes in affinity that arise when peptides, displayed on the surface of a nanoparticle carrier, bind to integrins displayed on the cell membrane. The IC50 of an RGD nanoparticle for endothelial adhesion was 1.0 nM n…
We present experimental results evidencing tuning of permittivity by applied electric field in strontium titanate.
Researchers at Pennsylvania State University have developed a way of generating electricity from corn waste.
Mechanisms of radiation aging of poly(methyl methacrylate) and methods for enhancing its resistance to high-energy radiation are considered.
The effect of the paste molding pressure on the physicomechanical and texture characteristics of catalysts was studied. An indirect criterion is suggested to evaluate the molding pressure in industrial extruders, whose optimal value ensures good physicomechanical properties of the catalysts and kinetic control over th…
Abstract We report on mechanical properties of multiwall carbon nanotubes (MWNTs)-polymer composites using the nanoindentation technique. The nanoindentation experiments conducted on thin films containing MWNTs revealed that the presence of nanotubes does not affect the nanomechanical properties of the composites. Eve…
Thin film Au/Pt/Ba0.25Sr0.75TiO3/Au/Ti varactors were fabricated on fused silica substrates using pulsed laser deposition of the ferroelectric films. Deposition temperature was optimized to improve varactor tuneability and loss tangent. The varactors were characterized in the frequency range 1-25 GHz at different dc b…
The structural and dielectric properties of Na0.5Bi0.5TiO3-PbZrO3 ceramics were studied by X-ray diffraction and impedance spectroscopy. We found formation of a continuous solid solution between the two end members. The corresponding crystal-symmetries and the lattice parameters were determined. The evolution of the d…
Cobalt ferrite composite thin films, CoFe2O4/SiO2, were prepared by sol-gel process, using tetraethylorthosilicate (TEOS) as a precursor for silica, and metallic nitrates as precursors for ferrite. The obtained dip-coated films thermally treated at 550, 750, and 950 ºC were transparent, homogeneous and adherent. Their…
Crystallographic slip at the beginning stages of plastic deformation is investigated via an atomistic (molecular statics) model. Attention is devoted to face-center-cubic metallic crystals in the form of a nanowire under uniaxial tensile loading. The simulation parameters employed in this work are such that dislocatio…
The electric field gradient (EFG) tensor at the aluminum nucleus sites in yttrium-aluminum garnet Y 3 Al 5 O 12 is calculated using the Hartree-Fock method and the nonempirical cluster approach. It is shown that the EFG tensor at the Al tetr sites is described well taking into account the nearest neighbors (an [AlO 4…
Abstract In the present work, we evaluate the optically stimulated luminescence (OSL) dosimetric properties of two polycrystalline 10 μm thick films, undoped and 750 ppm nitrogen doped, grown on (100) silicon substrates exposed to beta radiation. The samples were optically stimulated to free and to induce radiative re…
Rate and efficiency of electrochemical aluminium anodization as well as volumetric growth of porous anodic alumina in malonic acid solution are experimentally determined
Progress of IV-VI semiconductor (lead chalcogenides) research in China is reported. Lead chalcogenides (PbSe and PbTe) have been grown by molecular beam epitaxy (MBE). Evolution of PbSe surface morphologies with different Se/PbSe beam flux ratio has been studied by atomic force microscopy (AFM) and high-resolution x-r…
Rate and efficiency of electrochemical aluminum anodization as well as volumetric growth of porous anodic alumina in 0.6 and 1.0M sulphosalicylic acid solutions are experimentally determined