Materials Literature
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The influence of smectic level ordering on domain morphology has been studied in a series of monodisperse side-chain liquid-crystalline (LC) diblock copolymers. These systems, which consist of a polystyrene- b -methacrylate-based side-chain LC, were investigated using electron microscopy and room temperature X-ray sca…
Reactive micelle was prepared from an end-derivatized block copolymer, acetal−poly(ethylene glycol)−poly( dl -lactic acid)−methacrylate (PEG-PLA). The block copolymer of PEG-PLA formed a micelle with a diameter of approximately 30 nm determined from dynamic light scattering. The glass and Si wafer surfaces coated with…
Alkynyl-linked metallophthalocyanine dyads (see space-filling model) can be readily prepared from appropriately functionalized unsymmetrical ethynyl-phthalocyanines by means of metal-mediated coupling. This method can be advantageously applied to the synthesis of push–pull substituted dimers and heterodimetallic syste…
The effect of photoirradiation on the refractive index of a diarylethene polymer was investigated. Diarylethene polymer was prepared by a radical polymerization using 1-[6‘-(methacryoyloxyethyloxycarbonyl)-2‘-methylbenzo[ b ]thiophen-3‘-yl]-2-(2‘ ‘-methylbenzo[ b ]thiophen-3‘ ‘-yl) hexafluorocyclopentene (BTF6MA), sty…
The linear and cubic dynamic susceptibilities of solid dispersions of nano-sized maghemite particles have been measured for three samples with a volume concentration of magnetic particles ranging from 0.3 % to 17 %, in order to study the effect of dipole-dipole interactions. Significant differences between the dynamic…
By laser ablation we prepared thin films of the colossal magnetoresistive compound La_(1-x)Ca_xMnO_3 with doping levels 0.1
We report the bulk and surface properties of lithium computed within a full potential LCGTO formalism using both density functional theory and the Hartree-Fock approximation. We examine the convergence of computed properties with respect to numerical approximations and also explore the use of finite temperature densit…
A novel tetracarboxylic dianhydride bearing a cycloaliphatic structure, (4a rH,8a cH )-decahydro-1 t,4 t:5 c,8 c -dimethanonaphthalene-2 c,3 c,6 c,7 c -tetracarboxylic 2,3:6,7-dianhydride (DNDA), was synthesized, and its structure was determined using X-ray crystallographic analysis. Polycondensation of DNDA or bicycl…
Lithium- or potassium-doped carbon nanotubes can absorb approximately 20 or approximately 14 weight percent of hydrogen at moderate (200 degrees to 400 degrees C) or room temperatures, respectively, under ambient pressure. These values are greater than those of metal hydride and cryoadsorption systems. The hydrogen st…
Pb(Zr, Ti)O3 (PZT) thin films were deposited on various Pt substrates using a Pb(Zr0.63, Ti0.37)O3 and a Pb target by rf magnetron sputtering. The preferred orientation of PZT films was significantly influenced by a structure of Pt electrode. (100)-oriented PZT films grew on Pt/Ti/SiO2/Si substrate while (ill) PZT fil…
We prove stability of the kink solution of the Cahn-Hilliard equation ∂tu = ∂( ∂u − u/2 + u3/2), x ∈ ℝ. The proof is based on an inductive renormalization group method, and we obtain detailed asymptotics of the solution as t → ∞. We prove stability of the kink solution of the Cahn-Hilliard equation ∂tu = ∂( ∂u − u/2 +…
All articles of this category combinatorial chemistry - epoxides - carbonyl compounds - reduction - solid state - solid support
Linear continuous inhomogeneous strains (LCISs) are considered in decagonal and octagonal quasicrystalline lattices. At such strains, the magnitudes of position displacements are proportional to the strain value and the flip-flops of positions are absent. All possible variants of the spontaneous lowering of a quasicry…
The corrosion inhibition of mild steel, in 3 % NaCl solution of pH3, by amphoteric surfactants was evaluated in absence and in presence of 600 and 1200 mg H2S/l and at temperatures of 25, 40 and 65°C. These surfactants have the general formula. The presence of surfactants in the aqueous solution affected both the cath…
The fluorescence behavior of 1,1′-dimethyl-2,2′-carbocyanine and p-N,N-dimethylamino-styryl-2-ethylpyridinium was investigated in several epoxy systems. Time-correlated single photon counting was used for all fluorescence measurements to obtain the rate constant for viscosity or mobility-dependent nonradiative process…
This paper establishes the dependence of the velocity of the self-consistent motion of the foci of inhomogeneous plastic deformation on the strain-hardening coefficient during the stretching of single-crystal γ Fe. It is shown that the relationship between the velocity and the indicated quantity is inversely proportio…
Fractal geometry is used to evaluate the irregularities of crimped filament yarns. To measure the fractal dimension of textured filament yarns, methods based on the box counting dimension, the compass dimension, and the equipaced dimension are applied to digital images of the textured filament yarns, obtained using a…
Auramine O was investigated as inhibitor for the corrosion of mild steel in 1.0 M solution of various (sulphuric, hydrochloric, perchloric and phosphoric) acids by studying weight loss, polarisation curves and using electron spectroscopy for chemical analysis technique. Various corrosion parameters such as Tafel slope…
The kinetics of the thermal decomposition of poly(vinyl chloride) (PVC) was studied by a conventional thermogravimetric technique under various heating rates in a flowing nitrogen. The kinetic model that accounts for the ef fects of scission of the polymeric chain at any time was proposed to describe the thermal decom…
Heat capacities of ${\mathrm{La}}_{2}{\mathrm{NiO}}_{4+\ensuremath{\delta}}$ crystals were measured in the temperature range 14--400 K and composition range $0.047<~\ensuremath{\delta}<~0.116$ with an adiabatic calorimeter. Heat capacity anomalies were observed in the range 230--300 K due to positional order-dis…