Materials Literature
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A solution-based epitaxial route to prepare nickel-sheathed copper nanowires has been developed. Being essentially single-crystalline, the nickel phase in the resultant composite Cu@Ni nanowires exhibits a significant enhancement in coercivity at room temperature. With the assistance of ferromagnetic nickel, diamagnet…
With the rapid development of nanotechnology, the presence of nanoparticles (NPs) in commercially available products is becoming more and more common. The field of food nanotechnology has experienced significant growth over the last five years. Agricultural cultivation, food processing, food packaging, food security,…
Annealing of the quenched ibuprofen at 258 K yielded a new crystalline form, called phase II. Powder X-ray diffraction patterns of this phase II were recorded with a laboratory diffractometer equipped with an INEL G3000 goniometer and a curved position-sensitive detector CPS120. The starting structural model was found…
The iridium pincer complexes (PCP)IrH(4) (1; PCP = [kappa(3)-1,3-(CH(2)P(t)Bu(2))(2)C(6)H(3)]) and (POCOP)IrH(4) (2; POCOP = [kappa(3)-1,3-(OP(t)Bu(2))(2)C(6)H(3)]) have proven to be effective catalyst precursors for dehydrogenation of alkanes. The complex (POCOP)IrH(2) has also been applied successfully as a catalyst…
The reactions of manganese(II) acetate or perchlorate, sodium azide, and the inner-salt-type dicarboxylate ligand 1,3-bis(4-carboxylato-1-pyridinium)propane (L) under different conditions yielded four different Mn(II) coordination polymers with mixed azide and carboxylate bridges: {[Mn(L)(N(3))]ClO(4).0.5H(2)O}(n) (1)…
Abstract Novel epoxy nanocomposites based on a diglycidyl ether of bisphenol A (DGEBA) epoxy, an epoxy functionalized hyperbranched polymer (HTTE) and nano‐Al 2 O 3 were synthesized with the aim of determining the effect of the nano‐Al 2 O 3 particles and HTTE on the structure and properties of epoxy nanocomposites. T…
Dark field microspectroscopy is the primary method for the study of plasmon modes of individual metallic nanostructures. Light from a plasmonic nanostructure typically scatters with a strong angular and modal dependence, resulting in significant variations in the observed spectral response depending on excitation and…
First, the basis and the characteristics of the Czjzek model for the distribution of electric field gradient (EFG) tensor in disordered solids, some of which are still unnoticed, are depicted. That model results from the statistical invariance by rotation of the structure of the considered disordered solid and from th…
The NASA Glenn Research Center is developing a novel cell design and a novel ceramic fabrication technique to produce solid oxide fuel cells predicted to exceed a specific power density of 1.0 kW/kg. The NASA cell has taken a different approach among planar designs, by removing the metal interconnect and returning to…
Abstract We combine the supramolecular chemistry of heterocyclic ureas with the chemistry of epoxides to synthesize new crosslinked materials incorporating both chemical and supramolecular hydrogen‐bonded links. A two‐step facile and solvent‐free procedure is used to obtain chemically and thermally stable networks fro…
A zero thermal expansion and multiferroic compound 0.8PbTiO(3)-0.2Bi(Ni(1/2)Ti(1/2))O(3) was developed by a chemical modification route. The structure studies showed that the tetragonality of (1 - x)PbTiO(3)-xBi(Ni(1/2)Ti(1/2))O(3) was gradually weakened to cubic by introducing the dopant Bi(Ni(1/2)Ti)(1/2)O(3), and t…
A simple, convenient and versatile synthetic approach has been demonstrated for large-scale synthesis of zinc glycerolate microcrystals having preferential growth along the (100) axis. Glycerol has been used both as a ligand and as a solvent. This glycerolate precursor has subsequently been converted into the hexagona…
We report on intense red fluorescence from Mn(2+)-doped sulfophosphate glasses and glass ceramics of the type ZnO-Na(2)O-SO(3)-P(2)O(5). As a hypothesis, controlled internal crystallization of as-melted glasses is achieved on the basis of thermally-induced bimodal separation of an SO(3)-rich phase. Crystal formation i…
Linear polyglycidols of high molar masses were prepared by the monomer-activated anionic polymerization of the corresponding protected monomers, ethoxyethyl glycidyl ether and tert -butyl glycidyl ether, using a system composed of tetraoctylammonium bromide as initiator and triisobutylaluminum as monomer activator. Th…
We report an "exchange-rate-filtered" magnetic resonance approach that allows the detection of exchangeable protons of low-concentration solutes without interference from nonexchanging protons. This indirect detection of signals of multiple rapidly exchanging protons through the water signal can be achieved while reta…
Combining first-principles calculations and in situ photoelectron spectroscopy, we show how the composition and structure of the surface of an alloy catalyst is affected by the temperature and pressure of the reagents. The Ag-Cu alloy, recently proposed as an improved catalyst for ethylene epoxidation, forms a thin Cu…
The use of synchrotron-based spectroscopy has revolutionized the way we look at matter. X-ray absorption spectroscopy (XAS) using linear and circular polarized light offers a powerful toolbox of element-specific structural, electronic and magnetic probes that is especially well suited for complex materials containing…
IMPORTANCE OF THE FIELD: Dendrimers are synthetic macromolecules with well-defined structures, many terminal functional groups, and an inner space to hold small molecules. These properties make them potential drug carriers. Recently, stimuli-responsive drug delivery systems have become attractive because of the reduct…
Highly ordered mesoporous MnO 2 and Co 3 O 4 are prepared by adopting an SBA-16-based nanocasting strategy under ultrasonic irradiation and characterized by means of numerous techniques. It is shown that the as-fabricated manganese and cobalt oxides possess well-ordered mesoporous architectures with polycrystalline po…
The dependences of upconversion luminescence (UCL) on the particle size, shape, and inorganic−ligand interface of the hexagonal (β)-phase NaYF 4:Yb,Er upconversion nanophosphors (β-UCNPs) were studied. The photophysical data, e.g., relative UCL intensity, power-dependent UCL, green to red emission intensity ratio ( f…