Materials Literature
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The Fermi-surface topology of the organic superconductor λ-(BETS) 2 GaCl 4 has been determined using the Shubnikov-de Haas and magnetic breakdown effects and angle-dependent magnetoresistance oscillations. The former experiments were carried out in pulsed fields of up to 60 T, whereas the latter employed quasistatic f…
An in situ x-ray diffraction study was conducted to study the pressure-induced phase transformation in nanocrystalline anatase/rutile (TiO 2 ) to 35.1 GPa. The nano-anatase phase remains stable to approximately 16.4 GPa, and then transforms to an amorphous phase, which is returned upon release of pressure. The nano-ru…
Effects of calcination treatment on samples of mono-metallic Pd and Pd 77 -Ag 23 alloy with primary particles around 8 nm were studied with the temperature-programmed reduction technique. Temperature profiles of hydrogen consumption for calcined samples from a stream of 10% H 2 in N 2 were monitored by a thermal condu…
We present a photoemission and x-ray-absorption study of the misfit-layered (Bi,Pb)-Sr-Co-O compounds which have a Co-O triangular lattice with a mixed valence of ${\mathrm{Co}}^{3+}$ and ${\mathrm{Co}}^{4+}.$ The valence-band photoemission as well as the $\mathrm{O}1s$ and $\mathrm{Co}2p$ x-ray absorption spectra ind…
The unprecedented structural behavior of Co(3)(dipyridylamide)(4)Cl(2), characterized in two crystalline forms in which the tricobalt framework is either symmetric or highly nonsymmetric at room temperature is investigated by means of gradient-corrected DFT calculations. The isolated molecule is assigned a single ener…
A well-defined biodegradable block copolymer (PCL- b -PLLA, M n = 1.72 × 10 4, M w / M n = 1.37) of poly(ε-caprolactone) (PCL) and poly( l -lactide) (PLLA) was synthesized by a two-step ring-opening polymerization of ε-caprolactone and l -lactide. Furthermore, we found that α-cyclodextrin (α-CD) molecules may simultan…
An orthogonal, convergent route for the introduction of substoichiometric numbers of latent surface sites into dendrimers based on melamine is used to prepare targets that display one or two Boc-protected amines on the periphery. Asymmetry is the result of the stepwise incorporation of functionalized and unfunctionali…
The curvature effects in carbon nanotubes are studied analytically as a function of chirality. The $\ensuremath{\pi}$ orbitals are found to be significantly rehybridized in all tubes, so that they are never normal to the tubes' surface. This results in a curvature induced gap in the electronic band structure, which tu…
The effect of phonon scattering by surface roughness on the thermal conductance in mesoscopic systems at low temperatures is calculated using full elasticity theory. The low frequency behavior of the scattering shows novel power law dependences arising from the unusual properties of the elastic modes. This leads to ne…
Tensile drawing of poly(trimethylene terephthalate) (PTT) was studied at room temperature, 35, 50, and 75 °C. Instead of a typical increase in draw ratio with increasing temperature, the PTT draw ratio first increased, went through a maximum, and decreased; all occurred within a narrow range of temperature between T g…
Multiwalled BN nanotubes were synthesized via a chemical vapor deposition (CVD) route from a B 4 N 3 O 2 H precursor. Their morphological and structural features have been studied. It was suggested that the tips encapsulate boron oxynitride nanoclusters, which incorporate silicon, aluminum, and calcium and serve as th…
Anhydrous silylation of vinyltrimethoxysilane (VTMS) onto silica and zirconia substrates was investigated experimentally to demonstrate and quantify the effects of surface water on multilayer silylation. Silylation coverage was controlled by the availability of surface water, which is consumed in multilayer silylation…
Results are presented of a fully ab-initio calculation of impact ionization rates in GaAs within the density functional theory framework, using a screened-exchange formalism and the highly precise all-electron full-potential linearized augmented plane wave (FLAPW) method. The calculated impact ionization rates show a…
Nonequilibrium molecular dynamics simulations are used to study the shear thinning behavior of immiscible symmetric polymer blends. The phase separated polymers are subjected to a simple shear flow imposed by moving a wall parallel to the fluid-fluid interface. The viscosity begins to shear thin at much lower rates in…
High-resolution X-ray diffraction data show that the low-temperature superstructure of alpha-NaV2O5 has an F-centered orthorhombic 2a x 2b x 4c superlattice. A structure model is proposed, that is characterized by layers with zigzag charge order on all ladders and stacking disorder, such that the averaged structure ha…
We investigated the adsorption of a single atom, hydrogen and aluminum, on single-wall carbon nanotubes from first principles. The adsorption is exothermic, and the associated binding energy varies inversely as the radius of the zigzag tube. We found that the adsorption of a single atom and related properties can be m…
The effects of uniaxial strain on the structural, orbital, optical, and magnetic properties of ${\mathrm{LaMnO}}_{3}$ are calculated using realistic expressions for elastic energies, along with a tight-binding parametrization of the band theory and electron-phonon coupling. Tensile uniaxial strain of the order of 2% (…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTColloidal Imprinting: A Novel Approach to the Synthesis of Mesoporous CarbonsZuojiang Li and Mietek JaroniecView Author Information Department of Chemistry, Kent State University Kent, Ohio 44242 Cite this: J. Am. Chem. Soc. 2001, 123, 37, 9208–9209Publication Date (We…
A number of polyimides have gained considerable importance as high-performance polymers during the last 2 decades primarily because of their excellent thermal stability and toughness. Some applications, however, require property enhancements and the desired improvements can often be obtained through incorporation of c…
Lipophilic and hydrophilic dendra which are terminated with long alkyl chains and oligomeric poly(ethylene glycol) moieties, respectively, were synthesized, and these dendron species were used to functionalize single-wall (SWNT) and multiple-wall (MWNT) carbon nanotubes via amidation and esterification reactions. The…