Materials Literature
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Porous pure and doped silicas with pore sizes at two length scales (meso/macroporous) have been prepared and shaped both as powders and monoliths through a one-pot surfactant assisted procedure by using a simple template agent and starting from atrane complexes as inorganic precursors.
Carboxylate chemistry is used to covalently couple metal nanoparticles to defect sites in controllably oxidized single-walled carbon nanotube termini and side-walls, and this process monitored by atomic force microscopy.
Ab initio total-energy density-functional methods with supercell models have been employed to calculate the c(2x2) structure of the Br-adsorbed Ag(100) and Au(100) surfaces. The atomic geometries of the surfaces and the preferred bonding sites of the bromine have been determined. The bonding character of bromine with…
We have studied crystal structure, magnetism and electric transport properties of a europium fulleride Eu6C60 and its Sr-substituted compounds, Eu6-xSrxC60. They have a bcc structure, which is an isostructure of other M6C60 (M represents an alkali atom or an alkaline earth atom). Magnetic measurements revealed that ma…
Polycrystalline Mg(1-x)Al(x)B(2) (x = 0, 0.1, 0.4, 0.5, 0.6, 1) samples have been prepared by a conventional solid state reaction. The Mg 2p, Al 2p and B 1s core level binding energies have been studied using X-ray photoemission spectroscopy (XPS). It is found that Mg 2p, Al 2p and B 1s core level binding energies inc…
Using exact diagonalization method,we studied the ground state of the anisotropic molecular magnets and find a critical point in the transverse field,which may divide the quantum tunneling region into two different parts. Possible ways to observe and take advantage of this point by varying the transverse field are sug…
Electrochromic devices fabricated by layer- by-layer assembly of europium-containing polyoxometalate clusters, poly(allylamine hydrochloride), and poly(styrenesulfonate) are investigated (see Figure). A high electrochemical contrast, adequate response time, low operation voltage, and low power consumption are reported…
We report scanned probe investigations on the ferroelectric properties of individual single-crystalline barium titanate nanowires. We show that nonvolatile electric polarization can be reproducibly induced and manipulated on these nanowires, thereby demonstrating that nanowires as small as 10 nm in diameter retain fer…
Catalytic sites can be placed at the core, at interior positions or at the periphery of a dendrimer. There are many examples of the use of peripherally functionalized dendrimers in catalysis and this subject has been thoroughly reviewed in the recent literature. This review is concerned only with dendrimer based catal…
1D single-crystalline zinc oxide nanostructures are promising for nanoscale optoelectronic applications. Here a simple chemical vapor deposition method for the growth of well-aligned ZnO nanorods (see Figure) at low temperature is demonstrated. The nanorods, which grow on fused silica and are preferentially oriented i…
Ceramic fibers with the Si-C-O-Al composition were prepared by melt-spinning of polyaluminocarbosilane (PACS), initial curing in air and then thermal curing, before finally being pyrolyzed at 1300 °C. The ceramic fibers so-obtained were sintered at 1800 °C in argon to produce Si-C-Al ceramic fibers as a super high tem…
We compare experimental $\mathrm{O} 1s$ electron energy-loss structures below 30 eV of single crystalline ${\mathrm{SrTiO}}_{3},$ ${\mathrm{BaTiO}}_{3},$ and ${\mathrm{TiO}}_{2}$ with their theoretical electron energy-loss functions. The photoelectron energy-loss structures of in situ fractured surface in ultrahigh va…
Infrared spectra of dimethyl oxalate isolated in low-temperature argon matrix and of the compound in the solid amorphous and crystalline state are reported. The experimental observations are interpreted in terms of a large amplitude, low frequency vibration along the torsional coordinate OC–CO. Assumption of the large…
Field emission from multihead silicon (Si) cones was substantially improved by cesium (Cs) coating. Increasing the Cs coating lowered the emission turn-on field (for 10 μA/cm2) from 25 V/μm to a saturated value of 13 V/μm, while the threshold field (for 10 mA/cm2) decreased by 30%, dropping from 27 V/μm for Si cones c…
The synthesis, characterization and mesomorphic properties of gold(I) and silver(I) ionic isocyanide complexes [Au(CNR)2]Y [R = C6H4OCnH2n + 1, C6H4C6H4OCnH2n + 1, C6H2(3,4,5-OCnH2n + 1)3; Y = PF6−, BF4− (n = 4, 8, 12), Y = NO3− (n = 8)] and [Ag(CNR)2]Y [R = C6H4OCnH2n + 1 (n = 8, 12), C6H4C6H4OCnH2n + 1 (n = 4, 8, 12…
A systematic method is developed for construction of microstructures of poly- and nanocrystalline materials for various numerical modeling and simulations. The automatic method uses as input the distribution functions of microstructure quantities such as the grain size or texture and, through a sequence of minimizatio…
Point defects induced at the exit surface of optical-grade fused silica by high power (>30 J/cm2) 355 nm laser pulses have been investigated to elucidate the nature of laser damage in optics for use at high peak powers (>2 GW/cm2). Six defects have been identified. Eγ′ and E74′ defects were identified us…
A novel surface modification method of biodegradable polymers was investigated for inducing the attachment of specific cells onto the polymer surface via ligand-receptor interactions. Galactose, a targeting ligand specific to asialoglycoprotein receptors present on cell membrane of hepatocytes, was introduced on the s…
This letter reports the dielectric and ferroelectric properties of tungsten bronze Sr2−xCaxNaNb5O15 (SCNN, x=0.05–0.35) ceramics. Two dielectric anomalies and a diffuse ferroelectric transition behavior were appreciably observed in the compositions of x=0.05–0.25. The incorporation of smaller calcium cations into the…
Field emission of individual carbon nanotubes was observed by in situ transmission electron microscopy. A fluctuation in emission current was due to a variation in distance between the nanotube tip and the counter electrode owing to a “head-shaking” effect of the nanotube during field emission. Strong field-induced st…