Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
A new pressureless hydrothermal method for the preparation of yttrium disilicate is presented. The obtained amorphous precursor was calcined at different temperatures to form the Y-, α-, β-, and γ-phases of Y 2 Si 2 O 7, which have been characterized by DTA, XRD, TEM, and 29 Si-MAS RMN and IR spectroscopy. It is shown…
The crystal structures of 35 molecular compounds have been redetermined from laboratory monochromatic capillary transmission X-ray powder diffraction data using the simulated-annealing approach embodied within the DASH structure solution package. The compounds represent industrially relevant areas (pharmaceuticals; me…
Covalent functionalization and pore size manipulation were successfully achieved on ordered mesoporous carbons, by using a method in which diazonium compounds were in-situ generated and reacted with the carbon surface. Aryl groups substituted on the 4-poisiton (Ar−R, R = chlorine, ester, and alkyl) were covalently att…
A new computer program is described, GRINSP (geometrically restrained inorganic structure prediction), which allows the exploration of the possibilities of occurrence of 3-, 4-, 5- and 6-connected three-dimensional networks. Hypothetical (as well as known structure) models for binary compounds are produced with exclus…
UV-vis absorption and resonance Raman spectra of the complexes fac-[Re(Cl)(CO)3(stpy)2] and fac-[Re(stpy)(CO)3(bpy)]+ (stpy = t-4-styrylpyridine, bpy = 2,2'-bipyridine) show that their lowest absorption bands are dominated by stpy-localized intraligand (IL) pi pi* transitions. For the latter complex a Re --> bpy trans…
Air-stable n-type carbon nanotube field-effect transistors (CNTFETs) were fabricated, with Si3N4 passivation films formed by catalytic chemical vapor deposition (Cat-CVD). Electrical measurements reveal that the p-type characteristics of CNTFETs are converted to n-type after fabricating Si3N4 passivation films at 270°…
Preferred orientation is immediately visible on synchrotron diffraction images as intensity variations along Debye rings. In this report, the Rietveld method is applied to obtain quantitative information about the orientation distribution from the analysis of a single synchrotron diffraction image. The method is illus…