Materials Literature
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A novel algorithm to track the columnar front in one- (1D) and two-dimensional (2D) solidification problems has been developed and coupled with the governing equations of a deterministic model to predict the columnar-to-equiaxed transition (CET). The new algorithm, inspired by the cellular automaton (CA) technique, re…
The intensities of Raman-scattering bands in the spectrum of vitreous As 2 S 3 assigned to vibrations of intrinsic homopolar As-As ( ∼ 234 cm −1 ) and S-S ( ∼ 490 cm −1 ) bonds increase much more with the power of the exciting laser than does the principle vibrational band which is related to As-S-As glass-network vib…
A novel differential interferometer is being developed to measure the electron density gradient and its fluctuations. Two separate laser beams with slight spatial offset and frequency difference are coupled into a single mixer making a heterodyne measurement of the phase difference which is <1% of the total pha…
The Saupe ordering matrix of a banana-shaped mesogenic molecule as a solute in a common nematic calamitic solvent has been determined by 2H-NMR spectroscopy as a function of temperature. The temperature dependence of the Saupe ordering matrix element associated with the principal molecular axis is consistent with a gl…
Adsorption and reaction of benzene molecules on clean ${\mathrm{TiO}}_{2}(110)$ and on ${\mathrm{TiO}}_{2}(110)$ with deposited Pd nanoparticles are investigated using a combination of scanning tunneling microscopy (STM), temperature-programmed desorption, and first-principles calculations. Above $\ensuremath{\sim}50\…
Atom-transfer radical polymerization (ATRP) has been used to modify the surface of ZnO nanowires with a variety of methacrylate and styrene polymers in a living fashion. The polymers show narrow polydispersities ( M n / M w = 1.10−1.19), and polymerization could be reinitiated after removal of the nanowires from solut…
YciF is a protein that is up-regulated when bacteria experience stress conditions, and is highly conserved in a range of bacterial species. YciF has no known structure or biochemical function. To learn more about its potential molecular function and its role in the bacterial stress response, we solved the crystal stru…
Licht an: Ganz im Gegensatz zu SnIV-Komplexen normaler Porphyrine binden SnIV-Komplexe von N-invertierten Oxoporphyrinen Halogenide stark und unter deutlicher Fluoreszenzverstärkung in der axialen Position (siehe Schema; Ar=Ph, p-CF3C6H4, p-CH3C6H4) und können somit als neuartiger Prototyp von Fluoreszenzsensoren für…
Kristallkugeln: Kolloidale Kristallmikropartikel mit der Struktur eines dreidimensionalen photonischen Kristalls können mit einem Tröpfchengenerator erzeugt werden. Ihre Reflexionsspektren lassen sich als codierende Elemente verwenden, und ein Multiplex-Bioassay bestätigt die Eignung der Partikel als Codierungsträger…
Optimizing the active site: A pyridoxal 5′-phosphate(PLP)-dependent alanine racemase was converted into a retro-aldolase by a single active-site mutation. This new catalyst reacts efficiently with quaternary β-hydroxy α-amino acids, a class of molecules that natural aldolases have not been evolved to handle. Computati…
Abstract Morphology, chemical distribution and domain size in poly(ethylene terephthalate)/high‐density poly(ethylene) (PET/HDPE) polymer blends of various ratios prepared with and without maleic anhydride have been analyzed with confocal Raman mapping and SEM. The ratioimage method introduced here allows us to obtain…
A novel in situ approach to mass fabrication of carbon nanotubes was reported. Composites of polypropylene (PP)/organomontmorillonite (OMMT)/nickel formate (NF) were prepared by mixing these components in a Brabender mixer at an elevated temperature. Chestnut-like carbon nanotube (CNT) spheres were in situ fabricated…
Dreieckige Makrocyclen auf ortho-Phenylenethinylen-Basis mit polaren Ethylenoxid-Seitenketten in Chloroformlösung bilden spontan Vesikel, wenn sie mit Wasser in Berührung kommen. Deren Strukturen wurden durch Transmissionselektronen- und Rasterkraftmikroskopie charakterisiert. Die Selbstorganisation scheibenförmiger M…
We have measured the built-in potential of a series of polyfluorene-containing light-emitting diodes (LEDs) by electroabsorption spectroscopy. When the anode incorporates a layer of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), the inferred anode work function is equal to the ionization potentia…
Stabilizers prevent the inadvertent polymerization of acrylic acid; they work as scavengers. In practice, hydroquinone monomethyl ether (p-methoxyphenol, MeHQ), among others, has established itself as a standard stabilizer. Under the process conditions of acrylic acid production, MeHQ is required at high temperatures…
The reaction of the partial oxidation of methane was investigated over Ni/La 2 O 3 catalysts prepared by impregnation. Two different reactors were used, a perfectly jet-stirred reactor and a fixed-bed reactor. The influences of nickel content, calcination temperature, reaction temperature, residence time, and contact…
A highly photoresponsive perovskite hybrid containing an electroactive organic component (H1) was fabricated. A disubstituted polyacetylene (PA) with a hidden amino functionality (P3) was synthesized, hydrolysis and quaternization of which afforded the desired PA ammonium salt (P5). Mixing P5 with lead bromide readily…
To model the chemical properties of the hydrogen-terminated nanodiamond {111} and {110} surfaces, the functionalizations of the higher diamondoid [1(2,3)4]pentamantane were studied. [1(2,3)4]Pentamantane reacts selectively with neat bromine to give the medial 2-mono- and 2,4-disubstitution products. In contrast, oxida…
Abstract Raman spectroscopy has been used to study the structure of the humite mineral group ((A 2 SiO 4 ) n –A(OH, F) 2 where n represents the number of olivine and brucite layers in the structure and is 1, 2, 3 or 4 and A 2+ is Mg, Mn, Fe or some mix of these cations). The humite group of minerals forms a morphotrop…
Abstract 3,5‐Pyrazoledicarboxylic acid was used as a ligand for the synthesis of its Ce(III) and Nd(III) complexes. The complexes of Ce(III) and Nd(III) with 3,5‐pyrazoledicarboxylic acid were synthesized and their compositions were determined by elemental analysis. Vibrational study in the solid state of 3,5‐pyrazole…