Materials Literature
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Polyelectrolyte (PE) (see Figure) and PE–nanoparticle hybrid nanotubes are prepared by the layer‐by‐layer deposition of oppositely charged species into the cylindrical pores of polycarbonate membrane templates. This method affords the preparation of compositionally complex tubes with nanometer‐level controllable tube…
A periodic mesoporous organosilica composed of interconnected three-ring [Si(CH2)]3 units built of three SiO2(CH2)2 tetrahedral subunits is reported. It represents the archetype of a previously unknown class of nanocomposite materials in which two bridging organic groups are bound to each silicon atom. It can be obtai…
Composite molecular nanoclusters of fullerene and porphyrin prepared in acetonitrile/toluene mixed solvent absorb light over the entire spectrum of visible light. Upon slow evaporation of the solvent on the copper grid, these mixed nanoclusters undergo close-packed stacking to produce either tubular- or square-shaped…
Efforts to find the magnetic monopole in real space have been made in cosmic rays and in accelerators, but up to now there is no firm evidence for its existence due to the very heavy mass $\sim 10^{16}$GeV. However, we show that the magnetic monopole can appear in the crystal-momentum space of solids in the accessible…
The magnetocrystalline anisotropy energies (MAEs) of the ferromagnetic metals bcc Fe, fcc and hcp Co, and fcc Ni have been calculated by using the {\it ab initio} tight-binding method. Disentangling the strong correlation among the $d$ orbitals with the Hamiltonian in the local spin-density approximation, we have inve…
Abstract A comprehensive review of ongoing and recommended research directions concerning the structure, dynamics, and interfacial activity of synthetic and naturally occurring macromolecules at the solid–liquid interface is presented. Many new developments stem from the ability to target new size regimes of 1–100 nm.…
The synthesis and characterisation of a range of cobalt pivalate cage complexes are reported. The cages include: a dinuclear Co(II) complex; an oxo-centred Co(III) triangle; tetranuclear Co(II) heterocubanes and butterflies; tetranuclear heterovalent cobalt butterflies and hexanuclear edge-sharing bitetrahedra; hetero…
Electrical transport and optical properties were investigated in porous thin films consisting of ${\mathrm{In}}_{2}{\mathrm{O}}_{3}:\mathrm{Sn}$ (indium tin oxide, ITO) nanoparticles with an initial crystallite size of $\ensuremath{\sim}16 \mathrm{nm}$ and a narrow size distribution. Temperature dependent resistivity…
We studied the electrical conductivity of DNA samples as function of the number of DNA molecules. We showed that the insulating gap (no current at low voltage) increases from ~1-2 V for bundles and large ropes to ~4-7 V for few DNA molecules. From the distance dependent variation of the current, a unique hopping dista…
The electronic and optical properties of the cleavage InAs(110) surface are studied using a semi-empirical tight-binding method which employs an extended atomic-like basis set. We describe and discuss the electronic character of the surface electronic states and we compare with other theoretical approaches, and with e…
New efficient mechanism of obtaining spin polarization in_nonmagnetic_ semiconductors at arbitrary temperutures is described. The effect appears during tunneling of electrons from a nonmagnetic semiconductors (S) into ferromagnet (FM) through a Schottky barrier modified with very thin heavily doped interfacial layer.…
The two smallest boron clusters (B 3 and B 4 ) in their neutral and anionic forms were studied by photoelectron spectroscopy and ab initio calculations. Vibrationally resolved photoelectron spectra were observed for B 3 - at three photon energies (355, 266, and 193 nm), and the electron affinity of B 3 was measured to…
We characterize the iron and cobalt catalysts for carbon nanotube growth in chemical vapor deposition (CVD) by using electron microscopy. Nanoparticles of iron and cobalt exhibit a melting point drop in the methane ambient. Nanoparticles after nanotube growth are identified as Fe 3 C and Co 3 C for iron and cobalt, re…
The effect of substituents on the position and intensity of the electronic absorption and fluorescence spectra of phthalocyanines (Pcs) was examined for 35 Pc compounds. When electron-releasing groups are bound to four alpha-benzo positions of the Pc skeleton, the B and Q bands shift to longer wavelength. Relative to…
Abstract Because silica has strong filler–filler interactions, a silica‐filled rubber compound shows a poor filler dispersion compared to a carbon black‐filled one. Improvement of the filler dispersion in silica‐filled styrene–butadiene rubber (SBR) compounds was studied using low molecular weight polybutadiene (liqui…
With the ultimate goal of developing thermal storage materials by means of computer simulation, we attempt to predict a material's melting point and latent heat of fusion, both of which are important properties for evaluating a thermal storage material. Molecular dynamics calculations using the NPT ensemble were perfo…
New carbohydrate-functional siloxanes (CHFS) have successfully been synthesized by acid-catalyzed transacetalation between unprotected methyl gluconyl glycinate (MGG) as a hydrophilic component and an acetal-functional siloxane in DMF/dioxane mixed solvents. MGG, which can be regarded as a hybrid material composed of…
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We have investigated the role of N 2 in the synthesis of carbon nanotubes (CNTs) by dc hot-filament plasma-enhanced chemical vapor deposition. An NH 3 and C 2 H 2 gas mixture with a ratio of 4:1 was used as a precursor for the synthesis of CNTs on nickel-coated TiN/Si (100) substrates. N 2 gas was introduced at a flow…
The Rayleigh scatterings of fluorine-doped silica glasses as a function of fictive temperature were examined. The scattered intensity of pure silica glass increases proportionally to fictive temperature, implying that density fluctuation increases proportionally to fictive temperature. While the Rayleigh scattering ca…