Materials Literature
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Electrically-controlled diffractive gratings are developed on the basis of cholesteric liquid crystal confined between two transparent non-patterned electrodes. The electrodes are coated with alignment layers providing either planar or homeotropic anchoring. For planar alignment the applied electric field causes reori…
The Llano Estacado region of western Texas and adjacent New Mexico has one of the most species-rich charophyte floras known for North America, but upon closer inspection this flora is seen to consist of two, strictly non-overlapping segments, one of 12 taxa, the other of nine. The larger group of species is confined t…
An unusual structure is found for a novel triangulo palladium cluster, stabilized by 2,4,6-triphenylphosphine and triethylphosphane (see figure; large open circles: Pd, small hashed circles: P, small open circles: C). The bonding involving phosphinine bridges between two Pd atoms is based on σ and π orbital interactio…
Acicular ferrite fine particles (CoFe 2 O 4 and NiFe 2 O 4 ) were prepared by using an emulsion liquid membrane (ELM, water-in-oil-in-water (W/O/W) emulsion) system, consisting of Span 83 (sorbitan sesquioleate) as the surfactant and D2EHPA (bis(2-ethylhexyl)phosphoric acid) as the extractant (cation carrier). Co 2+,…
Dramatic differences in magnetic and electrical properties of the isostructural compounds [(DT-TTF)2M(mnt)2] have been investigated. For M = Au, with a diamagnetic anion, the conductivity is activated and two-legged spin-ladder magnetic behaviour is observed. Paramagnetic anions (M = Pt (shown here), Ni) give two magn…
Reversible redox systems for electrochromics with closed-shell colored species are provided by a combination of violene and cyanine structure types according to a general scheme shown in the figure.
A lamellar structure has been found for copper(I) thiolates in the solid state, contrary to earlier reports. On melting, a hexagonal columnar mesophase, in most cases stable within a range of 50–60 °C, is formed (see scheme).
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…