Materials Literature
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The electronic structure of well-ordered single-crystal thin films of CdO(100) has been studied using angle-resolved photoemission spectroscopy. Quantized electron subbands are observed above the valence-band maximum. The existence of these states provides evidence of an intrinsic electron accumulation space-charge la…
Three high-nuclearity NiII-substituted polyoxometalate compounds functionalized by exogenous ligands have been synthesized and characterized. The octanuclear complexes in Na15[Na{(A-R-SiW9O34)Ni4(CH3COO)3(OH)3}2] . 4NaCl . 36H2O (1) and Na15[Na{(A-R-SiW9O34)Ni4(CH3COO)3(OH)2(N3)}2] . 32H2O (2) can be described as two…
Photonic crystal surfaces are demonstrated as a means for enhancing the detection sensitivity and resolution for assays that use a fluorescent tag to quantify the concentration of an analyte protein molecule in a liquid test sample. Computer modeling of the spatial distribution of resonantly coupled electromagnetic fi…
Planar cyclic boron clusters with cobalt, iron, and nickel atoms at their centerssinglet D(8h) CoB(8)(-), D(9h) FeB(9)(-), CoB(9), and NiB(9)(+)are computed to be stable minima at the BP86/TZVPP DFT level. Stochastic searches of the singlet and triplet potential energy surfaces show the planar hypercoordinate D(8h) Co…
Nanostructured Bi 5 FeTi 3 O 15 prepared by a facile hydrothermal method is reported as a new visible-light-driven photocatalyst, which exhibits a nanoplates-built, flower-like hierarchical structure. Its peculiar growth process, from nanonets to nanoplates-built microflowers, was studied when the time-dependent exper…
Cocrystallization of phloroglucinol (PHG) and phenazine (Phen) afforded cocrystals of 1:1.5, 1:1.75, and 1:2 PHG·Phen stoichiometry upon grinding the two components in different starting ratios and then using suitable solvents for single crystal growth. The phenol···pyridine O−H···N synthon directs 1:1.5 bimolecular o…
Dissociation mechanisms for methanol and water on stoichiometric and defective TiO 2 (110) surfaces have been clarified from periodic density functional calculations. When the molecules are adsorbed on an oxygen vacancy, the most favorable route to dissociation is an indirect mechanism involving, initially, the format…
In the present work, a direction sensitive bending strain sensor consisting of a single block of epoxy/multi-wall carbon nanotube composite was developed. Moreover, the manufacturing could be realized in a straightforward single-step processing route. The directional sensitivity to bending deformations is related to t…
Open the cage: Symmetrical photoremovable bis-glutamate cages have been designed, synthesized, and characterized that can release a neurotransmitter with unprecedented two-photon efficiencies (see picture), up to 5 GM for BNSF–Glu (BNSF=2,7-bis-{4-nitro-8-[3-(2-propyl)-styryl]}-9,9-bis-[1-(3,6-dioxaheptyl)]-fluorene)…
Abstract The cold crystallization at temperature T cc (melting > T cc > glass transition) and the postmelting crystallization of polylactic acid plasticized by compressed carbon dioxide (CO 2 ) were studied using a high‐pressure differential scanning calorimeter. The kinetics of the two kinds of crystallization…
Using the unrestricted Hartree-Fock approximation and Landau theory we identify possible phases competing with superconductivity in FeAs layers. We find that close to half-filling the transition from the paramagnet to the magnetically ordered phase is first order, making anharmonicities relevant and leading to a rich…
Lyotropic nematic aqueous suspensions of single-wall carbon nanotubes can be uniformly aligned in thin cells by shearing. Homogeneous anisotropic thin films of nanotubes can be prepared by drying the nematic. Optical transmission between parallel or crossed polarizers is measured and described in order to estimate the…
Several enzymes have evolved as sensors in signal transduction pathways to control gene expression, thereby allowing bacteria to adapt efficiently to environmental changes. We recently identified the master regulator of cysteine metabolism in Bacillus subtilis, CymR, which belongs to the poorly characterized Rrf2 fami…
High activity is generated by sudden formation of disordered oxidic platinum over a platinum catalyst supported on alumina (see picture). High temperature and low concentration of carbon monoxide are required to generate high activity.
Ho ho ho! Characteristic visible and near-infrared (NIR) emission bands of the PrIII and HoIII complexes of the tetradentate 1-methyl-3-hydroxypyridin-2-one chromophore are observed in aqueous solution. The HoIII complex has been structurally characterized and, for the first time for a HoIII complex, the kinetics of t…
t-{Fe(abpt)(2)[N(CN)(2)](2)} [abpt = 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole] is an intriguing spin-crossover system that crystallizes in two polymorphs. Polymorph A is paramagnetic; its crystal structure consists of a single molecule located at the center of inversion symmetry. Polymorph B, on the other hand, ex…
Fluorescent probes that emit in the near-infrared (NIR, 700-1,300 nm) region are suitable as optical contrast agents for in vivo fluorescence imaging because of low scattering and absorption of the NIR light in tissues. Recently, NIR quantum dots (QDs) have become a new class of fluorescent materials that can be used…
Spatially resolved and polarized micro-Raman spectroscopy on microcrystalline graphene shows strong polarization dependences of double-resonance Raman intensities. The Raman intensity of the double-resonant 2D band is maximum when the excitation and detection polarizations are parallel and minimum when they are orthog…
This article reports a novel preparation of nearly monodisperse spherical aggregates of CeO 2 nanocrystals by using ionic liquid (1-hexadecyl-3-methylimidazolium bromide, C 16 MimBr) as both template and solvent. The products were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmis…
We present key factors that influence the mechanical stability of polyelectrolyte/nanoparticle composite microcontainers and their encapsulation behavior by thermal shrinkage. Poly(diallyldimethylammonium chloride) (PDADMAC), poly(styrenesulfonate) (PSS) microshells and citrate-stabilized gold nanoparticles are used.…