Materials Literature
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Propylene polymerization was carried out with MCM-41 supported rac-Et(Ind)2ZrCl2 catalysts, in the presence and absence of beta-cyclodextrin. The resultant PP was studied by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and differential scanning calorimetry. Through comparison of the res…
The deformation microstructures of high-quality synthetic type IIa diamond crystal around a Knoop indentation formed at room temperature were investigated. The atomic force microscopy observation showed that there are smooth deformation areas without cracks or fractures around the indentation. In addition, many disloc…
Peptide nucleic acid amphiphiles (PNAA) are a promising set of materials for sequence-specific separation of nucleic acids from complex mixtures. To implement PNAA in micellar separations, the morphology and size of PNAA micelles in the presence and absence of a sodium dodecyl sulfate (SDS) cosurfactant have been stud…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTThermal AnalysisSergey VyazovkinView Author Information Department of Chemistry, University of Alabama at Birmingham, 901 South 14th Street, Birmingham, Alabama 35294 Cite this: Anal. Chem. 2006, 78, 12, 3875–3886Publication Date (Web):April 14, 2006Publication History Publis…
This study focuses on the design of chemically regulated surfaces that allow for reversible control of the interactions between biological matter (cells and proteins) and planar substrates. As a tunable interlayer, we use a monolayer of a near-monodisperse poly[2-(dimethylamino)ethyl methacrylate-block-methyl methacry…
We describe a novel algorithm that includes the effect of host lattice flexibility into molecular dynamics simulations that use rigid lattices. It uses a Lowe-Andersen thermostat for interface-fluid collisions to take the most important aspects of flexibility into account. The same diffusivities and other properties o…
The structure, stability, and electronic properties of the tenfold surface of the decagonal Al-Co-Ni quasicrystal have been investigated using ab initio density-functional methods. The structural model of the surface has been derived from the recently resolved structure of the $W\text{\ensuremath{-}}(\mathrm{Al}\mathr…
Fibrillar collagens have an absolute requirement for Gly as every 3rd residue, whereas breaks in the Gly-X-Y repeating pattern are found normally in the triple helix domains of non-fibrillar collagens, such as type IV collagen in basement membranes. In this study, a model 30-mer peptide is designed to include the inte…
We have developed an atomistic lattice-gas model for the catalytic oxidation of CO on single-crystal Pd(100) surfaces under ultrahigh vacuum conditions. This model necessarily incorporates an detailed description of adlayer ordering and adsorption-desorption kinetics both for CO on Pd(100), and for oxygen on Pd(100).…
We demonstrate that a fluidized bed of hard spheres during defluidization displays properties associated with formation of a glass. The final state is rate dependent, and as this state is approached, the bed exhibits heterogeneity with increasing time and length scales. The formation of a glass results in the arrest o…
We present the first successful high-yield laser vaporization synthesis of high-quality boron-doped single-wall carbon nanotubes (B-SWNTs). Boron was loaded into graphite targets in the form of elemental B as well as nickel boride (NiB) and vaporized in a laser-oven apparatus in both Ar and N 2 ambients. Although targ…
We describe the construction of an electrochemical cell of the Bragg type suitable for in situ synchrotron X-ray measurements on rough, heterogeneous metals such as cultural heritage alloys and simulants with corroding or passivated surfaces. The cell features a working electrode, which may be moved under remote contr…
Ultrathin composite films of single-wall carbon nanotubes dispersed in polymer matrices of polystyrene and polyurethane elastomers with the thickness ranging from 100nmto3μm were formed by dip-coating procedure. Electrical conductivity in plane of the film was measured with application of silver electrodes deposited t…
A new member of the aluminum hydride family, CaAlH5, is formed during the decomposition of Ca(AlH4)2. The crystal structure of this new compound was calculated by density functional theory band-structure calculations and confirmed by X-ray powder diffraction analysis. The structure crystallizes in space group P2(1)/n…
A complete kinetic modeling of the polymer-derived ceramics (PDCs) route is achieved for the first time through the investigation of the solid-state decomposition of a typical melt-spinnable poly[B-(methylamino)borazine] into boron nitride fibers at various heating rates. Through the use of the Lorentz fitting approac…
Silica beads with average diameters of 40-600 nm were prepared, and Ru(bpy)3(2+) complexes were incorporated into the beads. These beads were coated by silver layer by layer to generate porous but continuous metal nanoshells. The thicknesses of these metal shells were 5-50 nm. The emission band from the dyes in the si…
Titanium-containing mesoporous SBA-15 (Ti−SBA-15) with various titanium contents were synthesized and characterized by means of N 2 adsorption, inductively coupled plasma-atomic emission spectroscopy, X-ray diffraction, UV−Vis diffusion reflectance spectroscopy, X-ray photoelectron spectroscopy, 29 Si magic-angle spin…
This article describes a rapid, solution-phase approach to the large-scale synthesis of faceted single-crystalline Se nanotubes, in the presence of cetyltrimethylammonium bromide. The products were characterized by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, X-ray…
Interfacial electron transfer (ET) dynamics of 5,10,15-trisphenyl-20-(3,4-dihydroxybenzene) porphyrin (TPP-cat) adsorbed on TiO2 nanoparticles has been studied by femtosecond transient absorption spectroscopy in the visible and near-IR region exciting at 400 and 800 nm. TPP-cat molecule forms a charge transfer (CT) co…
Base catalysis is of importance for organic synthesis in general and fine chemicals manufacture in particular. Activated hydrotalcites have recently received a great deal of attention as solid base catalysts; however, no systematic work on the nature of their active sites has been published up till now. In this work t…