Materials Literature
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Different morphological one-dimensional ZnO:Ce nanostructures were synthesized on a large scale. The microstructures and vibrational properties were investigated by x-ray diffraction, electron microscopy, Raman spectroscopy, and infrared spectroscopy. The results show that Ce can effectively control the growth of ZnO…
A newly discovered class of cell resistant surfaces, specifically engineered polyelectrolyte multilayers, was patterned with varying densities of adhesion ligands to control attachment of mammalian cells and to study the effects of ligand density on cell activity. Cell adhesive patterns were created on cell resistant…
We study the vortex state of a layered superconductor with vertical line nodes on its Fermi surface when a magnetic field is applied in the ab-plane direction. We rotate the magnetic field within the plane, and analyze the change of low-energy excitation spectrum. Our analysis is based on the microscopic Bogoliubov-de…
Gold nanoparticles immobilized on a silicon wafer were used to semi-quantitatively study the Raman enhancement from the individual particles and the interparticle coupling, with p -aminothiophenol ( p -ATP) molecules as Raman probes. At low coverage of gold nanoparticles on the surface, the gross intensity of the p -A…
We have measured the transformation of pseudomorphic Ni films on Pd(100) into their bulk fcc phase as a function of the film thickness. We made use of x-ray diffraction and x-ray induced photoemission to study the evolution of the Ni film and its interface with the substrate. The growth of a pseudomorphic film with te…
Two mechanisms for the breakdown of step flow growth, in the sense of the appearance of steps of opposite sign to the original vicinality, are studied by kinetic Monte Carlo simulations and scaling arguments. The first mechanism is the nucleation of islands on the terraces, which leads to mound formation if interlayer…
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…