Materials Literature
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There has been considerable debate in the literature about the true room-temperature structure of ZrP2O7 and related materials. In this article we describe how a combination of information from solid-state 31P NMR and powder diffraction data can be used to determine the structure of this 136 unique-atom material. The…
Electron field-emission measurements on individual carbon nanotubes (CNTs) were performed inside the transmission electron microscope (TEM). The field-emission characteristics of CNTs with different tip structures were compared, and their field conversion factor and emission area were studied systematically. It was fo…
Isothermal-isobaric (NPT) molecular dynamics simulations have been performed to investigate the structure, morphology, and energetics of polymer organoclay nanocomposites based on seven nonsteroidal antiinflammatory drugs (NSAIDs), two biocompatible polymers, and hydrotalcite as the clay mineral, both in an anhydrous…
Abstract Uniform, monodisperse gold nanocrystals have been prepared in a single‐step synthesis by the addition of secondary and tertiary alkylamines, or a cationic polymer containing these moieties, to dilute solutions of gold tetrachloraurate. The acidic pH resulted in the formation of quaternary ammonium sites, scav…
The structure of room-temperature ZrP2O7 is shown to be orthorhombic by a combination of high-resolution synchrotron powder diffraction and single-crystal synchrotron diffraction data. Small nontwinned single crystals were obtained by synthesizing the compound using solvothermal methods at temperatures below the cubic…
Aufgeblasen: Nasse Schäume, die mithilfe von Detergentien präpariert werden, sind thermodynamisch instabile Systeme, die schneller Disproportionierung, Entwässerung und Koaleszenz unterliegen. Nun gelang die Bereitung ultrastabiler Schäume mithilfe kolloidaler Partikel als Stabilisatoren (linkes Bild). Die Stabilisier…
The light extraction efficiency of a light-emitting element with microstructured surface is analyzed with a rigorous grating diffraction theory. The grating theory reveals an improvement of extraction efficiency due to diffraction of light by the surface microstructure. The simulation results show that the improvement…
A series of condensation polymers (polyesters and polyamides) of ferrocene and siloxane derivatives have been synthesized and characterized. Thus, 1,1‘-di(chlorocarbonyl)ferrocene (CAFc) and four different siloxane derivatives 1,3-bis(aminopropyl)tetramethyldisiloxane) (AP 0 ), α,ω-bis(3-aminopropyl)oligodimethylsilox…
Establishing a vector spherical harmonic expansion of the electromagnetic field propagating inside an arbitrary anisotropic medium, we extend Mie theory to the diffraction by an anisotropic sphere, with or without losses. The particular case of a uniaxial material leads to a simpler analysis. This work opens the way t…
Two structurally characterized dinuclear valence tautomers are described. Cobalt ions are bridged by p- and m-phenylene units connected to 2,2'-bipyridines. X-ray crystal structures show that the molecules are in the [(Co(III))(Co(III))] forms at ca. 125 K, while spectroscopic studies show that both molecules can achi…
A simple method to dramatically enhance the optical magnetoelectric (ME) effect, i.e., nonreciprocal directional birefringence, is proposed and demonstrated for a polar ferrimagnet GaFeO3 as a typical example. We patterned a simple grating with a period of 4 microm on a surface of GaFeO3 crystal and used the diffracte…
Polypyrrole (PPy) has been deposited from aqueous solution onto submicrometer-sized sulfur-rich poly[bis(4-vinylthiophenyl)sulfide] (PMPV) latex particles. The PMPV seed particles and resulting composite particles were extensively characterized using scanning electron microscopy, X-ray photoelectron spectroscopy, FT-I…
[reaction: see text] 1,3,5-Trisacetoacetamidobenzene with three 1,3-diketo groups was synthesized by the reaction of 1,3,5-triaminobenzene with diketene. Discotic hydrazone compounds were prepared by the diazo coupling reaction between 1,3,5-trisacetoacetamidobenzene and diazonium salts of 4-alkyloxyphenylamines. The…
Polyamidoamine dendrimers were synthesized with a single biotin moiety and used with cryptophane-A cages to form supramolecular biosensor constructs. These new biosensors amplified the NMR signals obtained from polarized xenon 8 times more than the original Xe biosensor.
Synthetic bifunctional probes based on [4,7-bis-carboxymethyl-10-(2-aminoethyl)-1,4,7,10-tetraaza-cyclododec-1-yl]-acetic acid (DO3A-ethylamine) preloaded with gadolinium were prepared for applications in targeted magnetic resonance imaging (MRI) and optical imaging. A convenient route of synthesis is reported, which…
Taking a stand: Self-assembled peptide aggregates adopt interfacial orientations in which they either lie horizontally (on highly ordered pyrolytic graphite, hydrophobic) or are oriented upright (on mica, hydrophilic) to form nanofilaments with different heights. This process is controlled by the interfacial hydrophob…
Synthetic chlorins bearing diverse auxochromes at the 3- and 13-positions of the macrocycle are valuable targets given their resemblance to chlorophylls a and b, which bear 3-vinyl and 13-keto groups. A de novo route has been exploited to construct nine zinc chlorins bearing substituents at the 3- and 13-positions and…
The dynamics of the wetting and movement of a three-phase contact line confined between two superhydrophobic surfaces were studied using a mean-field free-energy lattice Boltzmann model. Principle features of superhydrophobic surfaces, such as trapped vapor/air between rough microstructures, high contact angles, reduc…
Electrical, magnetic, and structural properties have been investigated for single-layered (${\mathrm{K}}_{2}\mathrm{Ni}{\mathrm{F}}_{4}$-type structure) compounds of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{1+x}\mathrm{Co}{\mathrm{O}}_{4}$ $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.5)$ as the hole-doped…
Support system: The stability of a LaPO4-supported Au nanocatalyst for CO oxidation exceeds that of Au nanocatalysts with oxide supports. Activation is achieved by high-temperature calcination under an oxidative atmosphere (see transmission electron microscopy image of crystalline Au nanoparticles on hexagonal LaPO4).…