Materials Literature
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Multicrystalline silicon wafers, widely used in commercial photovoltaic cell production, traditionally give much poorer cell performance than monocrystalline wafers (the previously highest performance laboratory devices have solar energy conversion efficiencies of 18.6% and 24.0%, respectively). A substantially improv…
Oxidative degradation of a flexible PVC pellet (F-PVC) with oxygen was carried out in 1–25-mol/kg(m)-H2O NaOH solutions, at 150–260°C and 1–10 MPa. Dehydrochlorination of F-PVC occurred first, followed by oxidation. The major products were oxalic acid, a mixture of benzenecarboxylic acids, and CO2. We obtained 320 g o…
Poly(ε-caprolactone)s (PCL) with slip masterbatch, Erucamide, SiO2 and Erucamide + CaCO3 as low-molecular-weight processing additives, were film-blown in a single screw extruder. The films and recycled PCL without additives were exposed to composting, anaerobic sewage sludge (37 and 55°C), pure fungal culture, and che…
A heterogeneous copper catalyst was developed using a novel technique metallo-organic chemical vapor deposition (MOCVD). Highly porous activated carbon was selected as the catalyst support to provide a high specific area. Copper acetylacetonate was used as the precursor. The precursor was evaporated by heating, transp…
Plasma polymerization of thiophene was carried out in a tubular reactor using an rf source. Various substrates such as aluminum, glass, and NaCl crystal were used. The rate of deposition attained an equilibrium value of 0.35 μg cm−2 s−1. Infrared spectra revealed the formation of polythiophene. The films were found to…
Copolymerization of ethylene and styrene by the INSITETM technology from Dow presents a new polymer family identified as ethylene–styrene interpolymers (ESI). Based on the combined observations from melting behavior, density, dynamic mechanical response, and tensile deformation, a classification scheme with 3 distinct…
CB2, a CNBr peptide of 36 residues from type I collagen alpha1(I) chain has been studied by NMR spectroscopy as a function of temperature. At low temperature, the guanidinium protons of Arg9 showed sharp 1:1:1 NMR triplets around 6.95 ppm, characteristic of 14N coupled protons (1J(NH)=52 Hz) when the quadrupolar relax…
Experimental solubilities are reported for anthracene dissolved in ternary 1-propanol + 1-butanol + cyclohexane, 1-propanol + 2-butanol + cyclohexane, 2-propanol + 1-butanol + cyclohexane, and 2-propanol + 2-butanol + cyclohexane solvent mixtures at 298.15 K. Nineteen compositions were studied for each of the four sol…
Edible films used as moisture barriers can enhance food quality. Dispersed phase particle size distributions of microfluidized whey protein−fatty acid emulsion films were measured to determine the effect of fatty acid type on microstructure. Emulsions of saturated fatty acids from C 14 to C 22 and whey protein isolate…
Beachtlich erweitert wurde die Gruppe der Ag-Se-Cluster durch die Synthesen der Titelverbindungen – eine Bestätigung für das Konzept, durch das Anbringen von organischen Liganden an der Clusteraußenseite die Zusammenlagerung zu stabilen binären Seleniden zu vermeiden. Das als Schutzligand verwendete Phosphan hat einen…
Are there more efficient ways to discover new catalysts? Classical efforts, while very successful, have been typically quite linear in design. In contrast, early efforts using diversity-based techniques such as parallel synthesis and screening (right) to rapidly identify and optimize new catalysts are beginning to yie…
Are there more efficient ways to discover new catalysts? Classical efforts, while very successful, have been typically quite linear in design. In contrast, early efforts using diversity-based techniques such as parallel synthesis and screening (right) to rapidly identify and optimize new catalysts are beginning to yie…
A noncyanocarbon-based molecule-based magnet [MnIIITPP]+[QCl4].− has been prepared, comprising tetraphenylporphinatomanganese(III), MnIIITPP, and tetrachloro-1,4-benzosemiquinone, QCl4. As structural motif it has a coordination-polymer structure with uniform, one-dimensional linear chains of alternating, albeit disord…
Triple-deckers 1 and 3 are extremely labile with respect to an exchange of their bridging arene middle deck. Crossover exchange experiments between 1, 3, benzene, and azulene have unraveled for the first time a dissociative mechanism for ligand exchange in organometallic triple-decker complexes. Further preparative ut…
The EtOH extract of the leaves of Holarrhena curtisii yielded five new steroidal alkaloids: 17-epi-holacurtine (3), 17-epi-N-demethylholacurtine (4), holacurtinol (5), 3alpha-amino-14beta-hydroxypregnan-20-one (7), and 15alpha-hydroxyholamine (8), in addition to the known compounds, holacurtine (1), N-demethylholacurt…
1200 Moleküle des Lösungsmittels können von einem Molekül des kationischen, dimeren Tensids 1 bei der Gelbildung in CHCl3 immobilisiert werden. Diese neuen Geliermittel enthalten chirale Gegenionen und bilden sowohl in organischen Lösungsmitteln als auch in Wasser Gele, indem sie sich zu helicalen Aggregaten zusammenl…
The selective incorporation of gold, when and where desired, within dendritic and multidendritic macromolecules can be accomplished by means of complexation on internal PNPNPS, PNPS, and PR2 groups; up to 90 AuCl moieties can be grafted into the internal layers of a multidendritic giant molecule (see picture).
Through a hole in a poly(ethyl acrylate) (PEA) layer that is electrochemically grafted to the surface of a vitreous carbon electrode-that is the route that must be taken by a growing polypyrrole nanowire in the electropolymerization of pyrrole. Chain growth is controlled by diffusion of the monomer through the DMF-swo…
A 1,3,5-alternate conformation of the pyrrole rings is adopted by the calix[6]pyrrole 1 in the crystal (see picture). Compound 1 was synthesized in a two-step process and although it crystallizes in the form of the adduct 1⋅3CH3COCH3⋅H2O⋅CHCl3, there are no solvent molecules in the cavity (cross section ca. 60Å2) of t…
The structural transformations and the photochromic properties of the 7-hydroxyflavylium ion have been investigated by means of the pH jump technique and continuous and pulsed light excitation. The various forms of flavylium compounds, trans- and cis-chalcone (Ct and Cc), quinoidal base A, and hemiacetal form B, are r…