Materials Literature
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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).…
In der Kürze liegt die Würze: Die nichtaromatische freie Base 6,16-Dimesityl-11-phenylsubpyriporphyrin, verwandt mit Triphyrin(1.1.1), enthält eine dreizentrige Wasserstoffbrücke. Laut Röntgenstrukturanalyse hat diese Verbindung den kleinsten bekannten N⋅⋅⋅N-Abstand (2.370 Å) zweier N-Atome, die an einer Wasserstoffbr…
Fullerene derivatives bearing long alkyl chains epitaxially adsorb on the basal plane of graphite forming well-ordered one-dimensional lamellae. Within the lamellae, the C60 moieties are organized in a zigzag-type fashion. The ordering is mainly governed by the substitution pattern and chain length of the alkyl chains…
The formation of clusters in condition of thermodynamic equilibrium can be easily observed both in two and three dimensions. In two dimensions relevant cases include pattern formation in Langmuir monolayers and ferrofluids, while in three dimensions cluster phases have been observed in colloids and in protein solution…
Periodic patterning on one-dimensional (1D) carbon nanotubes (CNTs) is of great interest from both scientific and technological points of view. In this letter, we report using a facile physical vapor deposition method to achieve periodic polyethylene (PE) oligomer patterning on individual CNTs. Upon heating under vacu…
Short and to the point: A three-centered hydrogen bond is present in 6,16-dimesityl-11-phenylsubpyriporphyrin, a non-aromatic free-base triphyrin(1.1.1)-related molecule. X-ray crystal structural analysis shows this compound contains the shortest known N⋅⋅⋅N distance (2.370 Å) for two N atoms involved in hydrogen bond…
The electronic properties of porphyrin zinc aggregates wired using single-walled carbon nanotubes (SWNTs) are described. A self-assembled structure is formed by casting a solution of SWNTs and 5,15-bispentylporphyrinato zinc(II) (BPP-Zn) onto a substrate (see figure). Rectifying behavior has been observed at SWNT/BPP-…
Stimuli-responsive polymer brushes with adsorbed fluorescent semiconductor nanocrystals can be used in solvent-sensitive sensors based on the fluorescence-interference contrast (see figure) of semiconductor nanocrystals near a reflecting silicon surface. The reversible, solvent-depending swelling of a thin, surface-an…
Raman scattering experiments on ${\mathrm{Na}}_{x}{\mathrm{CoO}}_{2}\ifmmode\cdot\else\textperiodcentered\fi{}y{\mathrm{H}}_{2}\mathrm{O}$ single crystals show a broad electronic continuum with a pronounced peak around $100\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}1}$ and a cutoff at approximately $560\text{ }\text…