Materials Literature
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Compressive creep tests have been carried out on Mg–14Li–Al–MgO/Mg 2 Si composites containing about 0, 5, 10 and 15 vol.-%MgO/Mg 2 Si particulates in the temperature range of 100–190°C and under different pressures in the range of 40–70 MPa. The results reveal that the creep resistance of the particulate composites is…
The birefringence induced by an acoustic field in the isotropic phase of the cholesteryl myristate cholesteric liquid crystal has been measured. The measurements were performed at sound frequencies of 3.2 and 9.8 MHz in a wide temperature range. Based on the results of the measurements of the induced birefringence, th…
High temperature thermoelectric properties have been measured on a Czochralski pulled Ba8Ga16Ge30crystal. Complete transport properties obtained in the temperature range from 273K to 1150K. The physical properties are reproducible even after thermal cycling. The Seebeck coefficient reveals the sample to be an n-type c…
Octasulfo-substituted cobalt phthalocyaninate was synthesized from 3,5-disulfophthalic acid, and its ammonium salt was converted into the corresponding sulfonyl chloride by the action of chlorosulfonic acid. Treatment of the chlorosulfonyl-substituted phthalocyanine complex with aliphatic amines gave octaalkyl-sulfamo…
Tellurium is an interesting semiconductor for thermoelectric applications because its thermopower is high (500 muV/K). Its figure of merit is low in the bulk because it has high thermal conductivity. However, in confined geometries, the phonon conductivity decreases due to phonon scattering. Therefore we have investig…
To reveal the nature of the zinc(II)-ion-induced ionochromic effect of bipyridine (bpy)-containing pi-conjugated polymers, we proposed an electrostatic interaction mechanism to illustrate our recent experimental findings [Tian, L., et al. J. Phys. Chem. B 2005 109 (15), 6944]. Our theoretical analysis was based on the…
Abstract BaFe 12– x (Mn 0.5 Co 0.5 Ti) x /2 O 19 hexaferrites with x = 1, 2 and 3 were prepared by a sol–gel process. The reaction temperature was much lower than that of the conventional ceramic method. The ferrite powders possess a hexagonal shape and are well separated from one another. Thermogravimetric analysis,…
A technique for production of fibrous materials containing layers of variable-thickness fibers is considered. Membranes in the form of alternating layers of thin and thick fibers are obtained from cellulose acetate and fluoroplastic solutions. The layers of thin fibers specify the filtering properties of the membranes…
Two new mesogenic homologous series, each consisting of a methoxyethyl tail and a Schiff 's base central linkage, have been synthesized by condensing 2-methoxyethyl 4-aminobenzoate with different 4-n-alkoxybenzaldehydes or 4-n-alkoxybenzoyloxybenzaldehydes to give series I and series II, respectively, and their mesomo…
We investigated the field-induced optical birefringence of a photopolymerized polymer dispersed liquid crystal (PDLC) with nearly a 50% volume ratio of phase-separated liquid crystal (LC) droplets. Measurements were performed in the in-plane switching configuration, which was attained by the use of interdigitated elec…
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…