Materials Literature
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A microbubble in a sound wave oscillates in volume and translates unsteadily. The two motions are coupled. In large-scale simulations of the structure of bubble clouds driven by acoustic fields, it has been of significant convenience to decouple volume oscillations and translation, as an approximation. The errors of t…
The effect of hot-rolling conditions on the structure, strength, ductility, fracture toughness, and technological properties of the nonmagnetic steel 05Kh22AG15N8M2F-Sh containing 0.55% N has been studied. A homogeneous and fine-grained austenitic structure forms in the steel upon rolling at 1000–1050°C and a reductio…
On the basis of micellar solubilization, a strategy tuning the solubility of gold nanoparticles reversibly was developed. Hydrophobic gold nanoparticles stabilized by octadecylamine (ODA-gold) solubilized in the micellar-like core of poly(vinylpyrrolidone) (PVP) in water to form gold nanoparticles with protective mult…
This paper presents a novel method for fabricating an ordered array of metallic nanoshells with a controllable shape by a combination of a porous polymer template and a nanocrystal-seeded electroless plating technique. The morphology of hollow particles has a strong dependence on the seed-deposition time onto the surf…
The synthesis, spectral and photophysical properties including fluorescence quenching of the following octa-substituted oxotitanium phthalocyanines are reported: 2,3,9,10,16,17,23,24-octaphenoxyphthalocyaninato titanium(IV) oxide, 2,3,9,10,16,17,23,24-[octakis(4-t-butylphenoxyphthalocyaninato)]titanium(IV) oxide, 2,3,…
The objective of this paper was to fabricate a biodegradable tubular scaffold for small diameter (d<6 mm) blood vessel tissue engineering. The tube scaffold needed a porous wall for cell attachment, proliferation and tissue regeneration with its degradation. A novel method given in this paper was to coat a porous laye…
The results of the analysis of variations in the radiative recombination coefficient with varying doping level and concentration of excess electron-hole pairs are reported. It is shown that, along with the effect of narrowing of the band gap calculated in the many-electron approximation, the effect of screening of the…
A durabilidade de compósito biomassa vegetal-cimento é um dos fatores mais importantes para a colocação desse material no mercado consumidor. A utilização de polímeros em concreto e argamassa, com o objetivo de melhorar sua durabilidade, é cada vez mais freqüente. Este estudo visou à caracterização de propriedades fís…
A thermodynamically driven self-organization of microclusters of semiconductor nanocrystals with a narrow size distribution into periodic two-dimensional (2D) arrays is an attractive low-cost technique for the fabrication of 2D photonic crystals. We have found that CdSe/ZnS core/shell quantum dots or quantum rods, tra…
We have prepared silicon nanoparticles by an arc discharge method in liquid nitrogen. This system is easily adoptable in the preparation of large quantities of Si nanoparticles and has the potential for low-cost production. Etching Si nanoparticles with hydrofluoric acid reduced their size and passivated their surface…
The results of a study of the transport and magnetic properties of some sulfides of 3d elements are reported. The concentration transitions with a change of conductivity type and a change of magnetic order are considered, and the features of the colossal magnetoresistance in FexMn1−xS and CuVxCr1−xS2 solid solutions a…
Nonlinear optical borate crystals of Gd1−xSCxCa4O(BO3)3 and Gd1−xLuxCa4O(BO3)3 have been grown and characterized. By changing the composition of these crystals, their optical birefringence can be controlled to obtain second-harmonic generations (SHG) in the ranges of 790-824 nm along the Y axis and 920-963 nm along th…
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…