Materials Literature
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DOI: 10.2514/1.26011 The effective use of existing finite element codes in the direct simulation of hypervelocity impacts by projectiles is limited by the dependence of the size of localized failure regions on the mesh size and alignment. This gives rise to a nonphysical description of the penetration and perforation…
ZnO film was grown on a heavily phosphor-doped n+-Si substrate by metal–organic chemical vapor deposition technology. X-ray photoelectron spectroscopy measurements indicate that a two-layer structure, comprised of a phosphor-doped ZnO layer and an un-doped ZnO layer, was formed during the diffusion process of phosphor…
The thermal conductivity $\ensuremath{\kappa}(T)$ of the crystalline and glassy phases of the two isomers of propyl alcohol has been measured. The two isomers differ by a minor chemical detail involving the position of the hydroxyl group with respect to the carbon backbone. Such a difference in molecular structure lea…
Samples of the anatase phase of titania were treated under vacuum to create Ti(3+) surface-defect sites and surface O(-) and O(2) (-) species (indicated by electron paramagnetic resonance (EPR) spectra), accompanied by the disappearance of bridging surface OH groups and the formation of terminal Ti(3+)-OH groups (indi…
Abstract Al‐doped La 9.33+ x /3+ y Si 6– x Al x O 26+3 y /2 ( x = 0–1.5, y = 0–0.67) apatite‐type lanthanum silicates (ATLS) were synthesized with a high‐power (1200 rpm) planetary ball mill that allows the formation of the lanthanum silicate phase after milling for 20–35 min at room temperature. The apatite phase alr…
We investigate analytically the anchoring of a nematic liquid crystal on a two-dimensionally grooved surface of arbitrary shape, induced by the elastic distortions of a liquid crystal adjacent to the surface. Our theoretical framework applied to a surface with square grooves reveals that such a surface can exhibit bis…
We obtained the spectral function of very high quality natural graphite single crystals using angle-resolved photoelectron spectroscopy. A clear separation of nonbonding and bonding bands and asymmetric lineshape are observed. The asymmetric line shapes are well accounted for by the finite photoelectron escape depth a…
Cross-linked W nanopetals were synthesized by dealloying the sputtered W−Al alloy film in HNO 3 aqueous solution for 24 h under open circuit conditions. Scanning electron microscopy, X-ray diffraction, and transmission electron microscopy characterizations demonstrate that the W nanopetals are less than 100 nm in thic…
Unburned carbon concentrates with different mineral matter contents were obtained from coal combustion fly ashes by an oil agglomeration procedure. The concentrates were then heated in the temperature interval 1800–2700 °C for the purpose of exploring their ability to graphitize. The influence of the treatment tempera…
The crystal structures of N-acetylglutamate synthase (NAGS) in the arginine biosynthetic pathway of Neisseria gonorrhoeae complexed with acetyl-CoA and with CoA plus N-acetylglutamate have been determined at 2.5- and 2.6-A resolution, respectively. The monomer consists of two separately folded domains, an amino acid k…
We report on high-accuracy angle-resolved optical transmission measurements through anisotropic 2D plasmonic crystals made of gold films with large-area rectangular arrays of nanoscale square holes, deposited on GaAs substrates. The measurements reveal the dispersion relations of air-gold and gold-GaAs surface plasmon…
DNA-porphyrin conjugates were designed and synthesized for the preparation of the conformationally controlled porphyrin dimer structures constructed on a d(GCGTATACGC)2. Porphyrin derivatives were introduced to the central TATpA sequence where p represents the phosphoramidate for the attachment of the free-base porphy…
The controlled self-assembly of polymer-stabilized quantum dots (QDs) into mesoscale aqueous spherical assemblies using microfluidics is described. In a flow-focusing configuration, self-assembly is initiated by the addition of water to a blended solution of polystyrene-coated QDs and amphiphilic polystyrene-block-pol…
High-resolution photoelectron spectroscopy of in situ prepared films of GeSb2Te4 reveals significant differences in electronic and chemical structure between the amorphous and the crystalline phase. Evidence for two different chemical environments of Ge and Sb in the amorphous structure is found. This observation can…
You say you want a resolution: Nucleation inhibitors for the resolution of diastereomers by selective crystallization have been designed and tested. The resolution of racemic 3-methoxyphenylethylamine was optimized with (S)-mandelic acid as the resolving agent (see scheme). Multifunctional inhibitors are particularly…
Abstract Das wachsende Interesse an der Umwandlung von schlecht zugänglichem Methan in einfach zu transportierende Flüssigkeiten sowie an der Brennstoffzellentechnologie hat für neuen Auftrieb bei der Suche nach effizienten Synthesegasproduktionsprozessen gesorgt. Die Herstellung von Synthesegas (CO/H 2 ), einem sehr…
The stretching of brushes of long polymers grafted to a planar surface is investigated by Monte Carlo simulations in the limit of very high grafting densities, as achieved in recent experiments. The monomer density profiles are shown to deviate considerably from the parabolic limiting form predicted by self-consistent…
Three perylene bisimide chromophores were arranged orthogonally to each other within the same molecule by appropriate 3-fold coupling to 10-methyltribenzotriquinacene, a rigid C(3v)-symmetrical framework containing three indane units oriented at right angles in space. The electronic operation of the three chromophores…
A series of novel wurtzite cadmium sulfide (CdS) hyperbranched structures, including dendrites, multipetal flowers, and multipods, were controllably synthesized by a N, N -dimethylformamide (DMF) assisted hydrothermal route. CdS micro/nanostructures of a certain morphology could be selectively produced by only varying…
Zinc oxide nanoparticles were prepared by uniform precipitation using urea hydrolysis. The ZnO precursor was slowly deposited from aqueous solution. Anionic surfactant was added into solution to block ZnO crystal growth and its agglomeration. Then ZnO nanoparticles were synthesized by the calcination of the precursor…