Materials Literature
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We give experimental and theoretical evidence of the Rashba effect at the magnetic rare-earth metal surface Gd(0001). The Rashba effect is substantially enhanced and the Rashba parameter changes its sign when a metal-oxide surface layer is formed. The experimental observations are quantitatively described by ab initio…
Natural gas is an extremely attractive fuel for use in fuel cells. Steam-reforming and oxidation of methane are particularly important for the direct methane fuel cell. A perovskite-related material, La 0.75 Sr 0.25 Cr 0.5 Fe 0.5 O 3 - δ (LSCrF), has been synthesized, and its catalytic properties as a potential anode…
We demonstrate the self-organization of CdSe nanorods into nematic, smectic, and crystalline solids. Layered colloidal crystals of CdSe nanorods grow by slow destabilization of a nanocrystal solution upon allowing the diffusion of a nonsolvent into the colloidal solution of nanocrystals. The colloidal crystals of nano…
A versatile bis(2,5-dimethyl-3-thienyl)-1,10-phenanthroline photochromic ligand has been successfully synthesized via a Suzuki cross-coupling reaction. The excitation wavelength for photochromic reaction of the dithienylphenanthroline could be extended from lambda </= 340 nm in the UV region to ca. 480 nm in the visib…
Arc-synthesized single-walled carbon nanotubes have been purified through preparative electrophoresis in agarose gel and glass bead matrixes. Two major impurities were isolated: fluorescent carbon and short tubular carbon. Analysis of these two classes of impurities was done. The methods described may be readily exten…
The adsorption phenomenon of neutral particles in a sample having the shape of a slab is theoretically investigated by using a particular form for the kinetic equation at the limiting surfaces. The time evolution of the bulk and surface densities is determined in a closed form by means of a simple expression. A discus…
The oscillation of ultrasonic cavitation bubbles at various dissolved-air concentrations in a sonochemical reaction field is investigated experimentally by laser-light scattering. When a thin light sheet, finer than half the wavelength of sound, is introduced into the cavitation bubbles at an antinode of sound pressur…
Hydrogels and macroscopic fibers are formed through the salt-induced self-assembly of water-soluble polycationic phosphorus dendrimers. Interestingly, the hydrogels are thermoreversible and the sol-gel transition temperature can be easily tuned in a wide range of temperatures (approximately 2-80 degrees C). The effect…
Abstract Summary: A new physical method of fabricating hollow spheres from different polymers has been developed. In this method, emulsions were prepared by mixing organic solutions of polystyrene, poly( D , L ‐lactide‐ co ‐glycolide) (PLGA), and bacterial poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV), water,…
ABSTRACT This paper examines fatigue crack paths in coarse‐grained magnesium alloys. Visualization of the microstructure by etching and continuous crack monitoring with a microscope provide evidence of the crack‐grain interaction at different fatigue crack growth regimes. Near‐threshold fatigue crack growth promotes t…
The effect of temperature on the adsorption isotherms for cupric and cadmium ions by corncob particles was investigated. The uptake of the two types of ions by corncob particles increased with temperature in the ranges between 25°C and 65°C and between 15°C and 65°C for copper and cadmium, respectively. In addition, a…
We present an atomistic investigation on mechanical loading effects in a model fiber-reinforced $\ensuremath{\beta}\text{\ensuremath{-}}\mathrm{Si}\mathrm{C}$ monocrystal where a crack is present. Our simulations are both consistent with the basic results of elementary continuum mechanics and provide a deeper physical…
Enzymatic degradation processes of flat-on lamellar crystals in melt-crystallized thin films of poly[(R)-3-hydroxybutyric acid] (P(3HB)) and its copolymers were characterized by real-time atomic force microscopy (AFM) in a phosphate buffer solution containing PHB depolymerase from Ralstonia pickettii T1. Fiberlike cry…
The synthesis, structure, and magnetic properties of two new tetranuclear Cu(II) complexes containing N,N,N',N'-tetraethylpyridine-2,6-dithiocarboxamide (S-dept) of formula [Cu(2)Cl(2)(mu-S-dept)(2)][Cu(2)Cl(4)(mu-Cl)(2)] (1) and [Cu(2)(mu-Cl)(2)(S-dept)(2)][CuCl(3)(EtOH)](2) (2) are reported. Their X-ray crystal stru…
We report the theoretical investigations on the giant magnetocaloric compound ${\mathrm{MnFeP}}_{0.45}{\mathrm{As}}_{0.55}$. The magnetic state equation used takes into account the magnetoelastic effect that leads the magnetic system to order under first order paramagnetic-ferromagnetic phase transition. The model par…
For patients with severe coronary artery and distal peripheral vascular disease not amenable to angioplasty and lacking sufficient autologous vessels there is a pressing need for improvements to current surgical bypass options. It has been decades since any real progress in bypass material has reached mainstream surgi…
Understanding of oxidative processes such as solution-phase ozonolysis in multiwalled carbon nanotubes (MWNTs) is of fundamental importance in devising applications of these tubes as components in composite materials, as well as for development of cutting and filling protocols. We present here an evaluation of various…
Poly[ N, N ‘ -(1,4-phenylene)-3,3‘4,4‘-benzophenonetetracarboxylic amic acid] (PAmA) with grafted poly(methyl methacrylate) (PMMA) side chains (PAmA- g -PMMA) was synthesized via thermally induced graft copolymerization of methyl methacrylate (MMA) with ozone-pretreated PAmA in the reversible addition-fragmentation ch…
Multiwalled carbon nanotubes (MWNTs) were functionalized by oxidation with potassium permanganate using a phase transfer catalyst. The functionalized nanotubes (f-CNTs) were allowed to react with a functional chemical such as 3-methacryloxypropyltrimethoxysilane (3-MPTS). The f-CNTs and the reaction product of f-CNTs…
Colloidal semiconductor nanocrystals: We present a hybrid inorganic–organic near-infrared light-emitting device (see picture), which comprises a blend of a blue–green emitting, hole-conducting conjugated polymer, methyl-substituted ladder-type poly(para-phenylene), and HgTe nanocrystals. The demonstrated device emits…