Materials Literature
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The inelastic scattering intensities of glasses and amorphous materials have a maximum at a low frequency, the so-called boson peak. Under applied hydrostatic pressure $P$, the boson peak frequency ${\ensuremath{\omega}}_{\mathrm{b}}$ is shifted upward. We have shown previously that the boson peak is created as a resu…
The isostaticity theory for stress transmission in macroscopic planar particulate assemblies is extended here to non-rigid particles. It is shown that, provided that the mean coordination number in $d$ dimensions is $d+1$, macroscopic systems can be mapped onto equivalent assemblies of perectly rigid particles that su…
We study the formation and decay of electron-hole droplets in diamond at low and high temperatures under different excitations by master equations. The calculation reveals that at low temperature the kinetics of the system is similar to that of a direct semiconductor, whereas at high temperature it is metastable and s…
We show that a ferroelectric phase transition takes place in the incommensurate phase of the K2SeO4 crystal. The ferroelectric character of the IC phase explains the second-harmonic generation observed in the corresponding temperature range.
Edible films made of agar (AG), cassava starch (CAS), normal rice starch (NRS), and waxy (glutinous) rice starch (WRS) were elaborated and tested for a potential use as edible packaging or coating. Their water vapor permeabilities (WVP) were comparable with those of most of the polysaccharide-based films and with some…
Two methods have been considered for the deposition of silver nanorods onto conventional glass substrates. In the first method, silver nanorods were deposited onto 3-(aminopropyl)triethoxysilane-coated glass substrates simply by immersing the substrates into the silver nanorod solution. In the second method, spherical…
New for old: A novel catalytic combustion method to synthesize multiwalled carbon nanotubes (MWNTs, see SEM image) in situ in high yields from polypropylene as the carbon source in the presence of an organic-modified clay and a supported nickel catalyst is reported. The method allows new high-value MWNTs to be created…
Almost all mineralized tissues contain proteins that are unusually acidic. As they are also often intimately associated with the mineral phase, they are thought to fulfill important functions in controlling mineral formation. Relatively little is known about these important proteins, because their acidic nature causes…
A series of gold nanoparticles were examined for uptake and acute toxicity in human leukemia cells. The nanoparticles (average diameter=18 nm), which possessed various surface modifiers, were not toxic to cells during continuous exposure for three days. Citrate-capped nanoparticles were further examined for their cell…
The electronic structures, dielectric functions, complex refractive indices and absorption spectra for a perfect PbWO 4 (PWO) crystal and the PWO crystals containing lead vacancy V Pb 2− have been calculated using a full-potential (linearized) augmented plane-wave (LAPW) + local orbitals (LO) method with the lattice s…
Diamond single crystals were synthesized in the presence of Ni–Mn catalyst under high temperature and high pressure (HPHT). A thin metal film covering on as-grown diamond formed during diamond growth was examined using transmission electron microscopy. It was shown that phase compositions of the region near the as-gro…
Replacement of expensive duplex stainless steel and conventional carbon steel by a new generation of supermartensitic stainless steel has been taken into account since the last decade in order to meet the technical-economical challenge for transportation flowlines of unprocessed oil and gas products in offshore techno…
Abstract To replace zinc in PVC stabilized formulations and generate a Heavy Metal Free System (HMFS), different costabilizers (i.e., 6‐amino‐1,3 dimethyluracil (Uracil), sodium tetraborate (Borax), sodium phenyl phosphinate (SPP), and NPPD ( N ‐phenyl‐3‐acetylpyrrolidin‐2,4‐dione), and their combinations) were tested…
A range of uranium oxide-based catalysts, derived from UO2(NO3)2.6H2O and UCl4 precursors, and supported on gamma-Al2O3, SiO2 and mesoporous H1SiO2, have been synthesized and then characterized using the following methods: isothermal nitrogen adsorption/desorption measurements, diffuse reflectance infrared spectroscop…
Magnetic properties and temperature dependence of electrical transport properties of rare-earth-metal Dy-doped GaN thin film are experimentally studied with a superconducting quantum interference device magnetometer and van der Pauw method. It was found that this thin nitride film has both semiconductor properties and…
We study theoretically the structure of sliding grafted polymer layers, or SGP layers. These interfacial structures are built by attaching each polymer to the substrate with a ringlike molecule such as cyclodextrins. Such a topological grafting mode allows the chains to freely slide along the attachment point. Escape…
Ultrathin La(0.8)Ca(0.2)MnO(3) films have been measured in a field-effect geometry. The gate electric field produces a significant ambipolar decrease in resistance at low temperatures. This is attributed to the development of a pseudogap in the density of states and the coupling of localized charge to strain. Within a…
Abstract Chiral conducting polyaniline, which was prepared electrochemically from (+) and (−) camphorsulfonic acid, was utilized for the enantiomeric detection of phenylalanine in neutral phosphate buffer solution. Following electropolymerization the polymer films were dedoped in aqueous ammonia and subsequently shown…
Abstract Uncompatibilized and compatibilized blends of poly(ethylene terephthalate) (PET) and high‐density polyethylene (HDPE) (50:50 PET/HDPE) have been prepared and characterized. A commercial grade of ethylene/methacrylic acid copolymer was used as compatibilizing agent and added to the blends in two different prop…
Abstract The nature of negative thermal expansion in the layer plane of the layered semiconductor TlGaSe 2 has been investigated. It is shown that, in contrast to other crystals with a layered structure in which negative linear expansion is observed, the nature of the negative thermal expansion in TlGaSe 2 crystals is…