Materials Literature
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A dimeric capsule of coordination bowl 1 encapsulated a nine-residue peptide (Trp-Ala-Glu-Ala-Ala-Ala-Glu-Ala-Trp; 2) within the large hydrophobic cavity in water, and stabilized the alpha-helical conformation of bound 2. An NMR titration experiment revealed that monomeric bowl 1 recognized two Trp residues at the bot…
The New York Structural GenomiX Research Consortium (NYSGXRC) has selected the protein coded by yxaF gene from Bacillus subtilis as a target for structure determination. The yxaF protein has 191 residues with a molecular mass of 21 kDa and had no sequence homology to any structure in the Protein Data Bank (PDB) at the…
Near normal incident infrared reflectivity spectra of (001) SrTi1−xNbxO3 single crystal have been measured at different temperatures in the frequency region between 100 and 6000 cm−1. The optical parameters of phonons and plasmons are obtained on the basis of the double-damping extended Drude model. The lowest frequen…
The problem of soot emissions from diesel engines is introduced and the possible solution of combining doped perovskites and microwave (mw) irradiation to "clean up" diesel soot filters is outlined. Eighteen doped perovskite catalysts are synthesized and tested for propane and CO oxidation, which are taken as model co…
Hyper-Rayleigh or second harmonic Rayleigh scattering (HRS or SHLS) has been employed to measure equilibrium physical properties of molecules in solution. It has been utilized in our laboratory to obtain the dissociation constants of weak organic acids such as substituted benzoic and cinnamic acids in solution. Partit…
We succeeded in the synthesis of certain poly(silsesquioxane)s (poly(SCC)) with excellent refractive indices properties, which have pendant norbornadiene (NBD), azobenzene (AZ), and anthracene (AT) moieties. The photochemical reactions of the obtained poly(SCC) derivatives were examined in the film state upon UV irrad…
The "templating" K crown ether cation allows for the preparation of soluble layered oxalate-based bimetallic magnets, as in [K(18-crown-6]3{Mn3(H2O)4[Cr(ox)3]3}, with an unprecedented bidimensional polymeric anionic network that involves both oxalato bridges and H bonds. As in other 2D oxalate-bridged compounds, the c…
We report the synthesis of periodic mesoporous organosilica (PMO) spheres of a size between 3 and 14 μm. The ethylene-bridged PMO spheres were prepared via surfactant (dodecyltrimethylammonium bromide) mediated assembly of 1,2-bis(triethoxysilyl)ethylene without using any additional cosolvents and/or cosurfactants. Th…
We studied polycrystalline samples of the prototype magnetocaloric system Gd5Ge4 using scanning Hall imaging and global magnetometry. The magnetic field required to complete the phase transition that is critical for magnetocaloric application is reduced by up to 20% when small fragments, each consisting of several ran…
Photoinduced circular anisotropy has been demonstrated in thin films of a main-chain polymeric liquid crystal (PLC) system doped with photochromic W-shaped molecules containing two azobenzene groups by irradiating with circularly polarized light (CPL). Reversible photoinduced circular dichroism (CD) was observed with…
Solubilization of single walled carbon nanotubes (SWNT) in the presence of polycyclic aromatic hydrocarbons (PAHs) such as p-terphenyl and anthracene has been shown. The suspensions formed are stable for periods greater than 48 months but to date experimental research is scarce regarding the interactions that are taki…
The excitation of surface plasmons (SPs) by optically excited silicon quantum dots (QDs) located near a Ag interface is studied both experimentally and theoretically for different QD-interface separations. The Si QDs are formed in the near-surface region of an $\mathrm{Si}{\mathrm{O}}_{2}$ substrate by Si ion implanta…
Tellurium impurity centers in $\mathrm{ZnSe}$ were individually probed with time-resolved photoluminescence (PL) spectroscopy. Resolution-limited peaks with an ultralow spatial density originate in the recombination of excitons deeply bound to isolated nearest-neighbor isoelectronic Te pairs $({\mathrm{Te}}_{2})$. Thi…
A nanocylinder placed on a fluid interface can assume an end-on or side-on orientation, or it can immerse itself in the surrounding bulk phases. Any of these orientations can satisfy a mechanical force balance when the particle is small enough that gravitational effects are negligible. The orientation is determined by…
Was geht in einer Bürste vor? Die radikalische Atomtransferpolymerisation von [2-(Methacryloyloxy)ethyl]dimethyl(3-sulfopropyl)ammoniumhydroxid (MEDSAH) auf Silicium- und Goldoberflächen führt zu homogenen gemusterten Poly-MEDSAH-Bürsten. Die Assoziation der zwitterionischen Seitengruppen wurde bestimmt (siehe Bild; B…
A facile nonaqueous route has been developed for the preparation of tetragonal CoMn 2 O 4 nanocrystals. In a simple reaction process, cobalt (II) acetylacetonate and manganese (II) acetylacetonate were dissolved in oleylamine and allowed to decompose at 230 °C. This process led to nearly monodisperse nanocrystals with…
CaCu 3 Ti 4 O 12 exhibits an unusually high dielectric constant on the order of 105 and highly nonlinear I-V characteristics. Impedance spectroscopy measurements carried out in this work point to the crucial role played by grain boundary barriers in controlling the electrical properties of this material. Under dc bias…
A 3D ZnO nanostructure with sisal-like morphology has been synthesized in the temperature range 120–220 °C by a rapid hydrothermal route (30 min) via the assembly of CTA + and Zn(OH) 4 2− . The obtained samples are hexagonal wurtzite structures and they exhibit special optical properties with a red-shift of about 20 n…
Shape selective synthesis of ZnO micropencils and microhexagonal cones has been demonstrated using a controlled method of modified vapor deposition. A plausible growth mechanism based on the results of scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, thermogravimetry, and differential…
Dichte Schale: Aus unterschiedlich temperaturempfindlichen Polymeren ließ sich ein Kern-Schale-Mikrogel herstellen, dessen Schale bei mittleren Temperaturen eine höhere Segmentdichte Φ aufweist als der Kern (siehe die radialen Dichteprofile: Kern rot, Schale blau). Genauere Informationen liefert die Kleinwinkel-Neutro…