Materials Literature
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The spatial distribution of the electronic wave function of a shallow, interstitial Li donor in a ZnO semiconductor nanocrystal has been determined in the regime of quantum confinement by using the nuclear spins as probes. Hyperfine interactions as monitored by electron nuclear double resonance spectroscopy quantitati…
Light and heavy neutron-irradiation damage of highly oriented pyrolytic graphite (HOPG) crystals was examined by means of X-ray diffraction and high-resolution high-voltage transmission electron microscopy (TEM). From the X-ray data analysis, it was found that there is an average increase of about 3% in the c -axis la…
A one-dimensional two-phase model of an adsorptive catalytic monolith reactor is developed and analyzed. The model simulates the generic features of NOx storage and reduction (NSR), a periodic process involving the sequential trapping on a storage component and conversion of NOx to nitrogen under lean conditions found…
The microstructure, static, and dynamic magnetic properties have been investigated for BaCoZnFe16O27 doped with small amounts of V2O5 from 0 to 1.5wt%. The results show that the doping of V2O5 can significantly improve the dynamic properties of W-type barium ferrites at microwave frequency. As compared to the undoped…
We synthesized nanotubes and nanowires of π-conjugated poly (3-methylthiophene) (P3MT) by using nanoporous anodic aluminum oxide (Al2O3) template through electrochemical polymerization method. From scanning electron microscope and transmission electron microscope photographs, we observed the formation of nanotubes wit…
Multilayer films were assembled using the sequential alternate adsorption of a hydrophilic−hydrophobic copolymer, poly(styrene- alt -maleic acid) (PSMA), and poly(ethylene oxide) (PEO). The film buildup was followed using quartz crystal microgravimetry, and it was demonstrated that the incorporation of 0.2 M sodium ch…
Unprecedented levels of internal order are obtained in multiwalled carbon nanotubes grown by chemical vapor deposition with a nitrogen-doping level of 3%. The tubes are much more ordered than pure carbon equivalents, and are also externally straighter and thicker. The graphene layers are either pure zigzag or pure arm…
Molecular dynamics simulations are carried out to study the incipient dislocation plasticity in Ni3Al. Dislocation nucleation is found to occur preferentially at energetic atomic clusters with larger-than-average relative displacements. From the simulated distribution of the atomic relative displacements, a scaling mo…
Mesoporous carbon/silica nanocomposites (see Figure) have been synthesized by carbonization of an ordered mesostructured phenylene/silica hybrid with both meso- and molecular-scale ordering. The carbon/silica nanocomposite exhibits an unique pore wall containing carbon and silica components. Removal of the silica resu…
Copper was etched from a silicon surface using the chelator hexafluoroacetylacetone (hfacH) dissolved in supercritical carbon dioxide (scCO 2 ) at 40−60 °C and 100−250 atm. Copper was deposited on Si(100) using doped HF solutions in the form of 10−90 nm Cu islands, as shown by scanning electron microscopy (SEM). X-ray…
Thermotropic nematic electrolytes are obtained by dissolving lithium salts within nematogens bearing poly(ethylene oxide) (PEO) chains located either at the termini or in the middle of the rigid nematogen cores (see Figure). The ionic conductivity is enhanced for alkali salt/liquid crystal mixtures with short terminal…
A new method for mounting protein crystals and other environmentally sensitive samples for room-temperature diffraction measurements is described. A crystal is retrieved using a microfabricated sample mount as recently reported, and the mount is inserted into a modified goniometer-compatible base. A transparent thin-w…
Ultrathin films were fabricated using synthesized hydroxyl polyimide (HPI) in a layer-by-layer fashion on amine-terminated substrates of silicon, quartz, and gold. The interlayer linkages were established by using terephthaloyl chloride as a bridging agent to form ester groups between HPI layers. Fourier transform inf…
The expression of certain endothelial cell adhesion molecules (ECAMs) is increased in the vasculature of the inflamed bowel (e.g., colitis), thereby providing an opportunity for targeted drug delivery. We recently demonstrated that biodegradable particles conjugated with ligands to ECAMs exhibit significant selective…
Phase behavior and rhythmically grown ring-banded spherulites in thin films of liquid crystalline poly(aryl ether ketone) (LC-PAEK) and poly(aryl ether ether ketone) (PEEK) blends have been investigated by differential scanning calorimetry (DSC), polarized light microscopy (PLM), atomic force microscopy (AFM), transmi…
Crystallization of n-hexadecane in emulsion droplets was studied using time-resolved two-dimensional small- and wide-angle x-ray scattering with differential scanning calorimetry (2D-SAXS-WAXS-in situ DSC) which provides information about both nano- and subnanoscale structural change. n-hexadecane in droplets reproduc…
Unique starlike CdS particles were prepared from the lyotropic triblock copolymer solution system. The starlike CdS consists of a spherical core and dozens of the attached conical nanolobes. From the comparative studies with the spherical and rod-shaped CdS nanoparticles, the unique photophysical property is presented…
Effective grain alignment is accomplished in Bi4Ti3O12 ceramics by a new processing concept based on superplastic-deformation-induced directional dynamic ripening. The developed anisotropic ceramics with well-aligned grain structures (see Figure) exhibit unique anisotropic dielectric and piezoelectric properties. This…
Sodium lithocholate forms stabilized cylindrical nanotubes with thin monomolecular walls (see Figure) through fast and complex morphological evolutions. The kinetics of formation can be followed by small-angle X-ray scattering using a brilliant synchrotron source, and are corroborated by cryo-transmission electron mic…
Abstract The dynamic mechanical properties of oil palm fiber reinforced phenol formaldehyde (PF) composites and oil palm/glass hybrid fiber reinforced PF composites were investigated as a function of fiber content and hybrid fiber ratio. The dynamic modulus of the neat PF sample decreases with decrease in frequency. G…