Materials Literature
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The structure of lanthanide-doped (La, Sm, and Ce) V 2 O 5 /Al 2 O 3 catalysts for the Selective Catalytic Reduction (SCR) of NO x with NH 3 in the presence of O 2 have been studied by means of XRD, S BET, XAS, UV−vis, XPS, and TPR techniques. As function of the vanadium loading and lanthanide dopant used, an alterati…
Diameter distributions of single-wall carbon nanotubes (SWNTs) produced by an arc discharge with a Rh−Pt catalyst at various helium pressures from 50 to 1520 Torr were studied by transmission electron microscopy and Raman scattering spectroscopy. The distribution shifted systematically to small diameter with the decre…
Cubic solid solutions of general formula Ce 1 - x M x O 2 (M = Zr, Th, Hf) have been modeled in the range (0 < x < 1) using atomistic simulation methods. The Ce 4+ /Ce 3+ reduction energy in the bulk materials and the activation energy for oxygen migration have been calculated. The Ce 4+ /Ce 3+ reduction energy decrea…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNanopattern Formation from Tethered PS-b-PMMA Brushes upon Treatment with Selective SolventsBin Zhao, William J. Brittain, Wensheng Zhou, and Stephen Z. D. ChengView Author Information Department of Polymer Science The University of Akron, Akron, Ohio 44325-3909 Cite t…
Adsorption and reaction of NO on the (5 × 20)-Pt(100) surface and two Sn/Pt(100) surface alloys have been studied using temperature programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). On the (5 × 20)-Pt(100) surface, in the absence of Sn, NO is primarily reversibly adsorbed, and…
Surface modification of CeO 2 −ZrO 2 solid solutions took place using formation and transport of volatile vapor complexes such as AlCl 3 −CeCl 3 and AlCl 3 −ZrCl 4, which was denoted as “chemical filing.” XPS analysis showed surface Ce enrichment, and transmission electron microscopy and Raman spectra revealed that a…
This presentation summarizes efforts to develop and apply chemically bonded phosphate ceramic (Ceramicrete{trademark}) technology for radiation shielding applications. The specific application being targeted is a packaging system for spent-fuel transport and storage. Using Ceramicrete technology under ambient conditio…
Single-crystal X-ray analyses of oligomeric models for high-performance aromatic polymers, interfaced to computer-based molecular modeling and diffraction simulation, have enabled the determination of a range of previously unknown polymer crystal structures from X-ray powder data. Materials which have been successfull…
Polycondensation reactions of optically active ( S, S )-1,3-dimethyl-1,3-diphenyldisiloxanediol [( S, S ):( S, R ):( R, R ) = 86:14:0] with bis(dimethylamino)dimethylsilane and bis(dimethylamino)diphenylsilane were carried out to give stereoregular and optically active polysiloxanes. The stereoregularity of the polysi…
Carbonate is generally a strongly complexing ligand for f-element ions, including trivalent lanthanides. The few lanthanide(III) carbonates previously characterized have extended multidimensional solid state structures. Spectroscopic and solubility studies indicate that the solution species are monomeric; however, str…
Two different synthetic routes for the formation of sodium phenylsiloxanolate (SPS) have been developed: (i) the cleavage of oligo(phenylsilsesquioxane), OPSSO, by NaOH in n -butyl alcohol and (ii) the reaction of phenyltri- n -butoxysilane, PhSi( n -BuO) 3, and NaOH in n -butyl alcohol in the presence of water. From…
A systematic approach is proposed to structural characterization of templated nanoporous materials with cubic symmetry by gas adsorption. We hypothesize that regular structures of these materials can be described in terms of triply periodic minimal surfaces (TPMS), similarly to bicontinuous mesophases observed in oil−…
The vibrational structures of 4-nitro-azobenzene (NAB), 4-(dimethylamino)-azobenzene (DAB), and 4-nitro,4‘-(dimethylamino)-azobenzene (NDAB) are of interest due to their importance in optoelectronic applications as well as the unique isomerization mechanism involving the inversion process (at the nitrogen site). In th…
The giant magnetoresistance (GMR) of ferromagnetic bilayers with a superconducting contact (F1/F2/S) is calculated in ballistic and diffusive regimes. As in spin-valve, it is assumed that the magnetization in the two ferromagnetic layers F1 and F2 can be changed from parallel to antiparallel. It is shown that the GMR…
A shaped, magnetic ceramic was obtained from a metal-containing polymer network, which was synthesized by thermal polymerization of a metal-containing organosilicon monomer. Pyrolysis of a cylinder, shape, or film of the metal-containing polymer precursor produced a low-density magnetic ceramic replica in high yield.…
Spider flagelliform silk is one of the most elastic natural materials known. Extensive sequencing of spider silk genes has shown that the exons and introns of the flagelliform gene underwent intragenic concerted evolution. The intron sequences are more homogenized within a species than are the exons. This pattern can…
Dynamic heterogeneity is an active field of glass-transition research. The length scale of this heterogeneity is called the characteristic length. It can be calculated from complex heat capacity curves in the equilibrium liquid or from dynamic calorimetry curves corrected with regard to nonequilibrium. No molecular pa…
A bulk nanocrystalline (nc) pure copper with high purity and high density was synthesized by electrodeposition. An extreme extensibility (elongation exceeds 5000%) without a strain hardening effect was observed when the nc copper specimen was rolled at room temperature. Microstructure analysis suggests that the superp…
The structure of RuO(2)(110) and the mechanism for catalytic carbon monoxide oxidation on this surface were studied by low-energy electron diffraction, scanning tunneling microscopy, and density-functional calculations. The RuO(2)(110) surface exposes bridging oxygen atoms and ruthenium atoms not capped by oxygen. The…
Bulk quantities of defect-free silicon (Si) nanowires with nearly uniform diameters ranging from 40 to 50 angstroms were grown to a length of several micrometers with a supercritical fluid solution-phase approach. Alkanethiol-coated gold nanocrystals (25 angstroms in diameter) were used as uniform seeds to direct one-…