Materials Literature
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Software for time-of-flight single crystal diffractometer (SCD) data visualization and analysis was originally written to be run in batch mode on VMS-VAX systems. Modern computers and software tools allow a new level of visualization and user interaction. The Integrated Spectral Analysis Workbench (ISAW) is being exte…
NeXus is an international standard data format intended to reduce the need for redundant software development efforts in the neutron and x-ray scattering communities. As the NeXus standard matures it is starting to be used at laboratories for storing raw data. The Manuel Lujan Jr. Neutron Scattering Center (MLNSC) at…
Organically modified layered silicates (OLS) with high thermal stability are critical for synthesis and processing of polymer layered silicate nanocomposites (PLSN). In the current study, the non-oxidative thermal degradation chemistry of alkyl and aryl quaternary phosphonium-modified montmorillonites (P-MMT) was exam…
A real crystal octahedron is defined as any polyhedron bounded, at least, by some of four pairs of parallel planes being in a standard crystallographic orientation with arbitrary distances between them. All the combinatorially non-equivalent shapes (30 in total) are found and characterized by 2-subordination symbols,…
Low-dose, low-temperature kinematic and dynamical convergent-beam electron diffraction (CBED) patterns from thin organic crystalline films have been used for the measurement of structure-factor amplitudes and phases. Kinematic conditions are identified by the observation of uniform intensity within the CBED discs and…
Dreikernige Kupferkomplexe wurden mit einem in 2,4,6-Position modifizierten 1,3,5-Trihydroxybenzolliganden erhalten (siehe Bild; =Bipyridin, 2-Formylphenolat). Die m-Phenylenverbrückung führt in diesen Komplexen zu ferromagnetischen Wechselwirkungen durch Spinpolarisierung.
We have carried out DC magnetization measurements on spherical glassy carbon exposed to high temperatures and high pressures. The observed magnetic signals clearly depend on the sintering temperature. On the basis of the graphitization temperature (around 1400oC), the behaviour can be classified into three regions: (1…
Ein Triblockcopolymer als Templat und ein Organosiloxan oder ein organisches Additiv ermöglichten die erste Synthese von großporigen (bis zu 9.5 nm), dreidimensionalen, bikontinuierlichen mesoporösen SiO2-Materialien mit Ia3d-Symmetrie bei Raumtemperatur in wässrig-saurem Medium. Gezeigt ist eine Transmissionselektron…
Size-controlled nanocrystalline silicon (nc-Si) has been prepared from a-SiN x /a-Si:H/a-SiN x ('a' standing for amorphous) structures by thermal annealing. Transmission electron microscope analyses show that the lateral size of the nc-Si is controlled by the annealing conditions and the a-Si sublayer thickness. The d…
Einen nahezu kugelförmigen Cluster von etwa 2.5 nm Durchmesser bilden die Silberatome (blau), S2−-Liganden (gelb) und Phosphoratome der PnPr3-Liganden (grün) in [Ag188S94(PnPr3)30] (siehe Bild). Die Phosphanliganden stehen wie die Stacheln eines Igels vom Ag2S-Clusterkern nach außen ab, und das Schwefelteilgitter ist…
Cavities, indentations, and pockets aplenty! By means of self-activated silyl-assisted polyonio substitution (SASAPOS), meso-tetrakis(pentafluorophenyl)porphyrin can be nearly quantitatively converted into the twentyfold positively charged polycation 1, within which 20 counterions are housed. The most drastic steric a…
Polystyrene (PS) combs and dendrigrafts bearing di(hydroxymethyl) group termini at each branch end were used as starting materials for the preparation of branched and hyperbranched polymer structures with ferrocenyl moieties at their periphery. Quantitative acetalization of the 1,3-propanol ends using carboxaldehyde f…
Temperature-dependent magnetization and magnetoresistance of the Na doped La 1−x Ca x −y Na y MnO 3 type samples with x = 0.3 and 0 ≤ y ≤ 0.15, showing a rhombohedrally distorted perovskite structure with space group R c , have been studied under a pulsed magnetic field. With the increase in temperature from the low t…
Different solid/liquid "exchange" reactions involving divalent cations, protons, or ammonium ions have been performed at low/moderate temperatures (between 80 and 500 degrees C) on alpha-NaFeO2 dipped in molten salts (or acid) media. Several ferrites have been obtained which are nonstoichiometric with partially invers…
A lipid (1)-coated lipase can catalyze the oligomerization of diethoxydimethylsilane (DEDMS) in isooctane containing 2wt% water, where the polymerization occurs at the OH group of the coating lipid (1) in the enzyme cavity.
In an effort to understand the origins of the nearly constant loss in disordered materials, we report dielectric studies of a series of sodium germanate glasses, (Na2O)(x)(GeO2)(1-x) for x=0, 0.003, 0.01, 0.03, and 0.1 at temperatures between 85 and 700 K. Analysis of the conductivity scaling for these glasses demonst…
Single-walled carbon nanotubes (SWNTs) strongly adsorb macrocyclic tetraazaannulene complexes NiTMTAA and CuTMTAA from ethanol solutions, with a SWNT/complex mass ratio of ca. 5:4. According to the results of molecular mechanics modeling, this corresponds to dense monolayer coverage. A saddle-shaped conformation of th…
Amorphous hydrogenated carbon−germanium films (a-Ge X C Y:H) were fabricated by plasma chemical vapor deposition in an audio frequency (af) three-electrode reactor using tetramethylgermane (TMGe) as a source compound. Two types of the material, namely semiconducting (a-S) and insulating (a-I) films characterized by qu…
Diatoms are unicellular microalgae with intricate walls made from silica. In his Perspective, [Wetherbee][1] explains how these patterned walls are constructed. He highlights the report by [KrA¶ger][2] et al ., who show that key molecules in the silicification process, called silaffins, are highly phosphorylated in th…
Poly(D-lactic acid) (PDLA) and poly(L-lactic acid) (PLLA) macromonomers were synthesized for preparation of a novel cytocompatible polymer. The cytocompatible polymer was composed of 2-methacryloyloxyethyl phosphorylcholine (MPC), n-butyl methacrylate (BMA), and the enantiomeric PLLA (or PDLA) macromonomer. The degree…