Materials Literature
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The thermoelectric properties of La-filled skutterudites are discussed from the point of view of their electronic structures. These are calculated from first principles within the local density approximation. The electronic structure is in turn used to determine transport related quantities. Virtual crystal calculatio…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A selective electrodeposition method for the fabrication of extremely thin and long metallic and magnetic wires and other nanostructures is introduced. Growth is done on the cleaved edge of a semiconductor multilayer structure incorporating a 4 nm wide modulation doped quantum well. This conducting quantum well is con…
The tumbling dynamics of the ${\mathrm{NO}}_{3}^{\ensuremath{-}}$ anions in C${\mathrm{a}}_{0.4}$${\mathrm{K}}_{0.6}$(N${\mathrm{O}}_{3}$${)}_{1.4}$ liquid have been studied close to its glass transition $({T}_{g}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}333\mathrm{K})$ by ${}^{15}$N wide line NMR spectroscop…
We report an ellipsometric study of the free surface of a smectic liquid crystal possessing a smectic- $A$--to--isotropic phase transition. Approaching the transition from above, an ordered surface layer appears at a discontinuous transition one degree above the bulk transition temperature. With decreasing temperature…
An in situ x-ray diffraction study of room-temperature compression of rhombohedral boron nitride (rBN) was performed up to 10 GPa. Although no phase transformation of rBN was observed in a liquid pressure transmitting medium, the structure of rBN changed to become disordered within the layered stacking sequence at les…
Studies of epitaxial films on substrates with a range of lattice constants reveal two dominant contributions to the occurrence of colossal negative magnetoresistance (CMR) in these manganites: at high temperatures ( , being the Curie temperature), the magnetotransport properties are predominantly determined by the con…
ZnS:Cu nanocrystals were synthesized in polymeric networks. X-ray photoemission spectroscopy and atomic absorption data show that the Zn and Cu ion mass contents were about 8.2% and 0.12%, respectively. The particle size of ZnS:Cu nanocrystals was about 3.0 nm, measured by UV-vis spectrum. Due to the quantum size effe…
The temperature dependence of the upper critical magnetic field ${H}_{c2}(T)$ in the quasi-one-dimensional molecular superconductor (TMTSF${)}_{2}$P${\mathrm{F}}_{6}$ was determined via resistivity, for the intrachain (a), interchain (b), and interplane $({\mathbf{c}}^{*})$ directions. For H along a and b, ${H}_{c2}(T…
The possibility of thermodynamic correlation of partial and saturation swelling of styrene-acrylonitrile (SAN) copolymer particles by styrene (St) and acrylonitrile (AN) monomers is investigated. The unknown Flory-Huggins interaction parameters involved in the thermodynamic swelling equations are estimated by fitting…
Cooperative upconversion processes and Yb-Er energy transfer efficiencies in high Er concentration phosphate glasses were studied. The cooperative upconversion coefficients were deduced from the pump intensity dependence of luminescence decay curves. Cooperative upconversion coefficients of <SUP>4</SUP>I<SUB>13/2</SUB…
The organic template within molecular sieves may readily be studied by FT–Raman spectroscopy with virtually no interference from bands due to framework vibrations. FT‐Raman spectra show that morpholine and cyclohexylamine are in the protonated form within AlPO 4 ‐based materials with the chabazite structure, while spl…
Surface modification of poly(p-phenylene terephthalamide) (PPTA) film by a remote oxygen plasma treatment has been investigated from a viewpoint of comparison with a direct oxygen plasma treatment. We call the modification procedure in a space far away from the oxygen plasma zone “the remote oxygen plasma treatment,”…
Rosetten , die durch Wasserstoffbrückenbindungen zusammengehalten werden (rechts), können aus komplexchemisch hergestellten Metallodendrimeren synthetisiert werden. Somit werden zwei orthogonale, nichtkovalente Wechselwirkungen (Metall‐Ligand‐ und Wasserstoffbrückenbindungen) zum Aufbau dieser nanometergroßen Dendrime…
Ohne zu haften rollen Tropfen von Rübsamenöl (siehe Bild) auf einer Oberfläche herum, die in zwei Schritten hergestellt werden konnte: Ein Aluminiumblech wird zuerst durch anodische Oxidation aufgerauht und dann mit fluorierten Monoalkylphosphaten behandelt. Der Kontaktwinkel einiger polarer Öle auf derartigen Oberflä…
A two-step process for lactic acid polymerization is studied: in the first step the lactic acid is condensation-polymerized to a low-molecular-weight hydroxyl-terminated prepolymer; and then the molecular weight is raised by joining prepolymer chains together using diisocyanate as the chain extender. The resulting pol…
The thermal recovery of the stored stress in crosslinked polyethylene has been commercially exploited in the preparation of heat shrinkable materials. The study on thermally recoverable crosslinked polyethylene compositions is reported in this paper. Thermally recoverable compositions were prepared by cross-linking of…
The porphyrin–prophyrin distance and the spatial requirements of the porphyrin substituents are parameters that influence the rotatability of the ligands in metal bis(porphyrinate)s (shown on the right): the chiral cerium complexes were much easier to racemize than the zirconium complexes. The porphyrin ligands in the…
The heavy-metal chelating properties of a soy protein based hydrogel, prepared by crosslinking an ethylenediaminetetraacetic acid dianhydride (EDTAD) modified soy protein isolate (SPI), have been studied. The equilibrium binding capacities of the divalent calcium, zinc, mercury, and lead ions by the gel were 0.70, 0.6…
The physical and thermal properties of hand-cast polyurethane and polyurethane/polyurea elastomers prepared from prepolymers of 20 and 97% trans,trans-4,4′-diisocyanatodicyclohexyl methane (t,t-rMDI) and C3- and C4-polyethers chain extended with either 1,4-butanediol (XB) or a commercial mixture of diethyl toluenediam…