Materials Literature
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We have investigated mixed electronic‐ionic conduction in 0.5[ x Ag 2 O·(1 − x )V 2 O 5 ]–0.5TeO 2 glasses, where the Ag 2 O amount varies over a range of 5–40 mol%. The glass samples have been prepared by quenching the melt. The ac conductivity has been measured at frequencies from 10 Hz to 100 kHz and temperatures o…
Abstract In the frequency range of 2–18 GHz, the microwave absorbing properties of a carbon black/silicone rubber blend were investigated by changing the carbon black content and the thickness. The real part (ε′) and the imaginary part (ε″) of permittivity of the blends were calculated from the S‐parameters measured b…
Nanoscale phase separation effects are of general interest in glass science. Such structural effects produce usually pronounced changes in glass physical properties which can mask the more subtle elastic effects related to rigidity transitions. The glass-transition temperature, T g , is an intrinsic measure of network…
The solubility of phenyl acetic acid, p -hydroxyphenylacetic acid, p -aminophenylacetic acid, p -hydroxybenzoic acid, and ibuprofen in water and in a range of organic solvents of relevance to industrial processing is reported. The solvents used are water, methanol, ethanol, 2-propanol, acetone, 4-methyl-2-pentanone, e…
Energies associated with deviations from stoichiometry for an extensive series of A 2 B 2 O 7 pyrochlores have been predicted. A 3+ cations range in size from Lu to La and B 4+ cations from Ti to Pb. Results are presented in the form of contour maps as a means of conveying large quantities of data as well as predictin…
Solid solution effects on the hardness and flow stress have been studied for zinc contents between 0.2 and 2.4 at% (0.5 and 6.9 wt%) in Mg. The alloys were grain refined with 0.6 wt% zirconium to ensure a similar grain size at all compositions. The hardness increases with the zinc content as Hv10 (kg mm—2) = 9 Zn (at%…
The preparation, characterization, materials properties, crystallization behavior and biodegradability of a polylactide (PLA)/organically modified layered silicate nanocomposite is described. Wide-angle X-ray diffraction and high-resolution TEM analyses confirmed that intercalated stacked and disordered/exfoliated mic…
Abstract Polymer layered‐silicate (clay) nanocomposites have not only the unique advantage of reduced flammability, but also improved mechanical properties. This is a key advantage over many flame retardants, which reduce flammability but also reduce the mechanical properties of the polymer. In our efforts to further…
The structure of a synthetic analogue of Na-birnessite (NaBi) was studied by powder X-ray diffraction (XRD). It is shown that NaBi has a one-layer triclinic structure with sub-cell parameters: a P = 2.9513(4) Å, b P = 2.9547(4) Å, c P = 7.334(1) Å, α P = 78.72(2)°, β P = 101.79(1)°, γ P = 122.33(1)°, and space group P…
We use time-dependent spin-density-functional theory to study dynamical magnetic phenomena. First, we recall that the local-spin-density approximation (LSDA) fails to account correctly for magnetic fluctuations in the paramagnetic state of iron and other itinerant ferromagnets. Next, we construct a gradient-dependent…
The electron-phonon interaction (EPI) in transition metal diborides TB_2 (T=Zr, Nb, Ta) is investigated by point-contact (PC) spectroscopy. The PC EPI functions were recovered and the EPI parameters lambda<0.1 were estimated for all three compounds. Common and distinctive features between the EPI functions for those d…
Poly(ethylene oxide)-b-poly(epsilon-caprolactone) (PEO-b-PCL) block copolymers self-assemble into micelles in aqueous solution. We have examined whether these micelles can internalize into P19 cells in vitro. Fluorescently labeled PEO(45)-b-PCL(23) block copolymer was prepared by conjugating a tetramethylrhodamine mol…
Transport of charge carriers can be controlled by doping through chemical and physical means. Unlike chemical doping, physical doping is carried out by a special technique through gate voltages in a field-effect transistor geometry. This technique keeps the carrier channels free from defects without complications from…
Erratum to Int. J. Quantum Chem. v. 89, pp. 57-85 (2002)
The results of Raman‐scattering studies of nanocrystalline CeO 2 and ZrO 2 :16% Y (YSZ) thin films are presented. The relationship between the lattice disorder and the form of the Raman spectra is discussed and correlated with the microstructure. It is shown that the Raman line shape results from phonon confinement an…
Abstract Flame retardant nanocomposites were synthesized by melt‐blending ethylene‐vinyl acetate copolymer (EVA) with multi wall carbon nanotubes. Fire property measurements by cone calorimeter revealed that the incorporation of multi wall carbon nanotubes into EVA significantly reduced the peak heat release rates com…
Amyloid fibrils in which specific proteins have polymerized into a cross-beta-sheet structure are found in about 20 diseases. In contrast to the close structural similarity of fibrils formed in different amyloid diseases, the structures of the corresponding native proteins differ widely. We show here that peptides as…
A dispersion of raw HiPco single-walled carbon nanotubes in methanol has been subjected to ozonolysis at −78 °C, followed by treatment with various reagents, in independent runs, to generate a higher proportion of carboxylic acid/ester, ketone/aldhehyde, and alcohol groups, respectively, on the nanotube surface. This…
Liquid crystals: main types and classification distribution functions and order parameters physical properties of liquid crystals nematic liquid crystals nematic liquid crystals - elastostatics and nematodynamics smectic liquid crystals liquid crystals of disc-like molecules polymer liquid crystals chiral liquid cryst…
Hydrolytically degradable, multilayered films ranging from 10 to 100 nm have been constructed by the layer-by-layer deposition of degradable polycations and oppositely charged polyanions. Polycations play dual roles in these systems, serving as structural components of the film as well as transient elements designed t…