Materials Literature
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The presence of silicon nanotubes (SiNTs) composed of rolled-up quasi-two-dimensional honeycomb nets was first revealed by transmission electron microscopy, energy dispersive X-ray spectroscopy, and electron diffraction analysis, among products synthesized using a simple laser ablation technique. They were coaxial mul…
In this work, the effect of temperature on the crystal growth rate of potassium sulfate in aqueous K 2 SO 4 and KCl−K 2 SO 4 solutions is analyzed. The crystal growth rate equation of K 2 SO 4 is developed on the basis of the difference of chemical potentials of K 2 SO 4 at the solid−liquid interface. The Lu−Maurer mo…
Physical and mathematical models as well as calculation methods of nitrogen bed on porous media have been introduced to evaluate the structural parameters of mesoporous materials. Kelvin's equation is a link between the relative adsorbate pressure, the mean pore radius, and pore capillarity on the basis of macroscopic…
This paper reports the results of lattice dynamics simulation of ${\mathrm{CsH}}_{2}{\mathrm{PO}}_{4}$ and ${\mathrm{CsD}}_{2}{\mathrm{PO}}_{4}$ crystals in paraelectric and ferroelectric phase using a semiempirical atomistic model based on the Coulomb, short range, covalent, and van der Waals interactions. The peculi…
The process of hydrophobic recovery of surface-polluted silicone rubber weather sheds on high voltage (HV) composite insulators was studied by applying an artificial kaolin coating to a sample of clean silicone rubber surface. Quantitative analysis of the kaolin coating into which had diffused low molecular weight sil…
The crystal structure of the low-temperature form of K 3 PO 4 has been determined for the first time using neutron diffraction (Rietveld method) and Raman spectroscopy: orthorhombic cell (sp. gr. Pnma, Z = 4), lattice parameters a = 1.12377(2) nm, b = 0.81046(1) nm, c = 0.59227(1) nm. The structure is made up of isola…
The phase transformation of a liquid crystal lens with its focus movable not only along but also off the lens axis is discussed. A lateral translation of the phase transformation is found. The wave front of an incident light wave in the exit pupil of the lens is observed by the interference method. It is found that th…
The thermoelectric properties of beta-rhombohedral boron and boron carbide, the best-investigated icosahedral boron-rich solids, are reviewed. Because of its high density of gap states (~1021cm-3) generated by intrinsic defects, p-type boron carbide behaves electronically extrinsic up to at least 2000 K, and therefore…
Abstract The crystalline structure of chitin and chitosan was investigated by X-ray diffraction (XRD). Chitosan filaments were prepared using a saturated solution of calcium chloride dihydrate in methanol (CaCl 2 -MeOH) as a mild solvent and the study focused on the interaction between the degree of acetylation (DA) a…
Mg2Si1-xSnxsystems, an ecologically friendly semiconductor, are the perspective material for thermoelectric generators at temperatures range from 500 to 800K. The single phase of this system at the compositions range of 0.42Si0.5Sn0.5has been successfully obtained by a Liquid-Solid reaction method and Hot-pressing met…
Symmetric ethenyldithiophenes are important intermediates for synthesis of photochromic materials and organic conductors. When acetonitrile is used as a solvent, 3-methylthiophenylphosphonium salts form symmetric ethenyldithiophenes in the presence of a strong base (e.g., NaH, (t)BuOK) in moderate to high yields. This…
Cation ordering in two important iron nickel sulfide minerals, pentlandite and violarite, was studied by neutron powder diffraction using samples prepared with isotopically enriched 60 Ni. Pentlandite of composition Fe 4.8 Ni 4.2 S-, annealed at 150° C for 1 month has a disordered Ni/Fe distribution with Ni occupying…
We present the results of ab initio calculations of the lattice dynamical and dielectric properties of the L-amino acids L-alanine, L-leucine, and L-isoleucine. Normal-mode frequencies and dielectric permittivity tensors are obtained using density-functional perturbation theory implemented within the plane-wave pseudo…
In this work the fibers of banana, hemp, and sisal are employed as fillers for the formation of wood polymer composites with polystyrene in the different ratios of 40:60 and 45:55 (wt/wt), respectively. These fibers were esterified with maleic anhydride, and the effect of maleic anhydride was studied on absorption of…
Amorphous iron‐containing deposits were formed on carbon films by electron beam induced deposition with a precursor of iron pentacarbonyl and alpha‐Fe nanocrystals were grown around the target tip deposits when the electron beam irradiation time was longer than 1000 s.
In this work, we have identified key process parameters to generate parallel unidirectional 1D assemblies of gold nanoparticles with the assistance of organic surfactants. By controlling the surfactant population, metal particle size, and amount of solvent for dispersion, the length of nanoparticle chains and their in…
Engineering of spun yarns having specific tensile, evenness and hairiness characteristics is a long-cherished dream of spinning technologists. Selection of suitable raw materials at minimum cost and optimisation of process parameters are the two major tasks to be achieved to manufacture engineered yarn. Advent of high…
The morphology and stability of well-ordered, nanostructured Au/TiO2(110) surfaces, prepared by deposition of Au loaded micelles on TiO2(110) substrates and subsequent oxidative removal of the polymer shell in an oxygen plasma, was investigated by noncontact AFM, SEM and XPS. The resulting arrays of Au nanoparticles (…
Addition of CO on Cu-exchanged zeolite was investigated by means of quantum chemical calculations based on density functional theory. The aim of this investigation was to get insights about changes of electronic properties of a copper site with zeolite composition by using a CO probe molecule. Calculated nu(CO) freque…
The effect of alcohols on the initial growth of the multibubble sonoluminescence (MBSL) intensity in aqueous solutions has been investigated. With increasing concentrations of the alcohols, the number of pulses required to grow the MBSL intensity to a steady state (N(crit)) increases (relative to that of water) initia…