Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionExperimental Determination of the Extinction Coefficient of CdTe, CdSe and CdS Nanocrystals.W. William Yu, Lianhua Qu, Wenzhuo Guo, and Xiaogang PengCite this: Chem. Mater. 2004, 16, 3, 560Publication Date (Web):January 13,…
The photo-oxidation of polypropylene/montmorillonite nanocomposites has been studied under irradiation at long wavelengths (λ > 300 nm) at 60 °C and in the presence of oxygen. The chemical modifications resulting from photo-oxidation were followed by IR and UV−visible spectroscopies for each component of these nanocom…
Abstract High‐density polyethylene (HDPE) was reinforced with expanded and untreated graphite in a melt‐compounding process. Viscosity increased upon addition of graphite phase, with the expanded graphite (EG) showing more dramatic rise than the untreated graphite (UG) in viscosity. The increase in viscosity was attri…
Carbon nanotubes change their electronic properties when subjected to strains. In this study, the strain sensing characteristic of carbon nanotubes is used to develop a carbon nanotube film sensor that can be used for strain sensing on the macro scale. The carbon nanotube film is isotropic due to randomly oriented bun…
One likely cause of polymer ignition in a high-pressure oxygen system is adiabatic-compression heating of polymers caused by pneumatic impact. Oxidative _ pyrolysis or combustion of polymers in a high-pressure oxygen system could generate toxic gases. This paper reports the preliminary results of toxic combustion prod…
We report Monte Carlo simulations of a system of rigid zigzag-shaped molecules that demonstrate that simple excluded-volume interactions are sufficient to produce a fluid tilted lamellar [smectic $C$ ($\mathrm{S}\mathrm{m}C$)] liquid crystal phase. The molecules are composed of three rigidly linked hard spherocylinder…
The new marine nanoplanktonic diatom, Thalassiosira fryxelliae , is described with light and scanning electron microscopy from material collected in Argentinian coastal waters. T . fryxelliae is a morphologically distinctive species with: 1) cells embedded in irregular gelatinous masses, 2) absence of central, sub-cen…
The biocompatibility of chemoenzymatically generated dextran-acrylate hydrogels has been evaluated in vitro, using human foreskin fibroblasts, and in vivo, by subcutaneous and intramuscular implantation in Wistar rats for up to 40 days. In vitro tests show that hydrogel extracts only minimally reduced (<10%) the mitoc…
We report on a photocrystallography investigation of the photoinduced phase transition in the Tris(\ensuremath{\alpha}-picolylamine)iron(II) chloride-ethanol complex. X-ray diffraction data show the structural rearrangement at the atomic scale accompanying the photosteady change of electronic state between the low-spi…
Summary The adsorption of phosphate by soil minerals controls availability of P to plants, but the chemical environments of adsorbed phosphate are poorly known. We used 31 P MAS NMR to study the adsorption of phosphate on to boehmite (γ‐AlOOH) and γ‐Al 2 O 3 with large surface areas. The solid phases were reacted in 0…
We describe a new means for electrically creating spin polarization in semiconductors. In contrast to spin injection of electrons by tunneling through a reverse-biased Schottky barrier, we observe spin accumulation at the metal/semiconductor interface of forward-biased ferromagnetic Schottky diodes, which is consisten…
Synchrotron-X-ray and surface tension studies of a strong polyelectrolyte (PE) in the semi-dilute regime (~ 0.1M monomer-charges) with varying surfactant concentrations show that minute surfactant concentrations induce the formation of a PE-surfactant complex at the gas/solution interface. X-ray reflectivity and grazi…
New mechanism of magnetoresistance, based on tunneling-emission of spin polarized electrons from ferromagnets (FM) into semiconductors (S) and precession of electron spin in the semiconductor layer under external magnetic field, is described. The FM-S-FM structure is considered, which includes very thin heavily doped…
Summary In some soils, aggregate coatings and walls of biopores differ in the content of clay and organic carbon from that of the aggregate interiors or the soil matrix. The composition of the organic matter on aggregates and on the surfaces of biopores is largely unknown. We have compared the composition of organic m…
On the basis of Friedel approach the theoretical description of the effects of resonance scattering of conduction electrons by donor impurities in semiconductors with allowance for the stabilization of electron concentration in coinciding the Fermi energy with the resonance level energy has been developed. It has been…
Dynamics of a one-dimensional growing front with an unstable straight profile are analyzed. We argue that a coarsening process occurs if and only if the period λof the steady state solution is an increasing function of its amplitude A. This statement is rigorously proved for two important classes of conserved and nonc…
This study reports the effect of a change in crystal form on the quality of interactive mixtures prepared with homogenous sugar beads and the three polymorphs of chloramphenicol palmitate (CAP). Six mixtures containing micronized CAP polymorph powder (0.5%) and sugar beads (99.5%) were mixed in a Turbula mixer at 27 r…
Complexation between poly(methyl vinyl ether-maleic anhydride) copolymer (Gantrez AN 169) and polyvinylpyrrolidone (PVP K-90D) in aqueous solutions were investigated using a viscometric method and Raman spectroscopy. The composite films with different weight ratios of PVP to Gantrez were prepared in the presence of N-…
The aim of this work is to evaluate the feasibility of hydrophilic silica aerogels as drug carriers and to investigate the influence of the aerogels properties on the release rate of poorly water-soluble drugs. Hydrophilic silica aerogels of different densities were loaded with two model drugs, ketoprofen and griseofu…
The title compound, octa-tert-butoxybis[micro(3)-2,2'-(N-methylimino)diethanolato]di-micro-oxo-tetratitanium(IV), [Ti(2)O[(OCH(2)CH(2))(2)(NCH(3))][(CH(3))(3)CO](4)](2) or [Ti(4)(C(5)H(11)NO(2))(2)(C(4)H(9)O)(8)O(2)], lies about an inversion centre, and displays the less usual zigzag configuration. One O atom of the N…